CN208782791U - A kind of symmetrical comparison circuit of positive and negative two directions' inputing based on single supply power supply - Google Patents
A kind of symmetrical comparison circuit of positive and negative two directions' inputing based on single supply power supply Download PDFInfo
- Publication number
- CN208782791U CN208782791U CN201821373319.9U CN201821373319U CN208782791U CN 208782791 U CN208782791 U CN 208782791U CN 201821373319 U CN201821373319 U CN 201821373319U CN 208782791 U CN208782791 U CN 208782791U
- Authority
- CN
- China
- Prior art keywords
- resistance
- comparator
- power supply
- negative
- inputing
- 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.)
- Active
Links
Landscapes
- Manipulation Of Pulses (AREA)
Abstract
The utility model relates to a kind of symmetrical comparison circuits of two directions' inputing based on single supply power supply, including power supply VCC, comparator N1, comparator N2, resistance R1, resistance R2, resistance R3, resistance R4 and resistance R5；Resistance R1, resistance R2, resistance R3 are sequentially connected in series, and resistance R1 is connect with power supply VCC, resistance R3 ground connection；The noninverting input of comparator N1 is connected on the series circuit between resistance R1 and resistance R2；The reverse input end of comparator N2 is connected on the series circuit between resistance R2 and resistance R3；The reverse input end of comparator N1 and the noninverting input of comparator N2 pass through resistance R5 connection power supply, and input comparison signal by resistance R4；The output end of comparator N1 is connect with the output end of comparator N2.The utility model solves traditional positive and negative two directions' inputing comparison circuit can not meet the technical issues of response speed is high, precision is high and high reliablity simultaneously.
Description
Technical field
The utility model relates to a kind of positive and negative two directions' inputing comparison circuits.
Background technique
Positive and negative two directions' inputing comparison circuit can be used for the fields such as PWM rectification and inverter power supply.To positive and negative two directions' inputing
The requirement of comparison circuit is: fast-response speed and high reliability and precision.
There are two types of traditional two-way comparison circuits: one is by negative voltage after absolute value circuit is converted to positive voltage,
It is compared again by single supply comparator, the structure of the circuit is as shown in Figure 1；Another kind is to directly adopt two dual power supply ratios
It is compared compared with device, the structure of the circuit is as shown in Figure 2.
The characteristic of absolute value circuit is heavily dependent on using the performance of the two-way comparison circuit of absolute value circuit, absolutely
To value circuit usually there are two types of mode is built, one is being built using amplifier, one is being built using bridge rectifier diode, adopt
The absolute value circuit conversion accuracy built with amplifier is higher, but response speed is unable to satisfy power supply generally in more than ten kHz
Protect the rapidity of circuit.And common amplifier is much higher than using the absolute value circuit response speed that bridge rectifier diode is built,
But it is non-linear due to diode, significantly reduce the precision of protection.
Circuit using 2 dual power supply comparators is using two independent comparison circuits, and one is that positive threshold compares
Circuit, the other is negative sense threshold value comparison circuit, and the threshold value of two comparison circuits is to need separately adjustable to can be only achieved balance
's.When positive-negative power changes, the threshold value of comparison circuit also will appear asymmetric situation, reduce reliability.
From be analyzed above as can be seen that traditional positive and negative two directions' inputing comparison circuit can not meet simultaneously response speed it is high,
The requirement of precision height, high reliablity.
Summary of the invention
It can not meet that response speed is high, precision is high and reliable simultaneously to solve traditional positive and negative two directions' inputing comparison circuit
Property high requirement, the utility model provides a kind of symmetrical comparison circuit of positive and negative two directions' inputing based on single supply power supply.
The technical solution of the utility model is:
It is a kind of based on single supply power supply the symmetrical comparison circuit of positive and negative two directions' inputing, it is characterised in that: including power supply VCC,
Comparator N1, comparator N2, resistance R1, resistance R2, resistance R3, resistance R4 and resistance R5, the resistance of the resistance R1 and resistance R3
It is worth equal, the resistance value of the resistance R4 and resistance R5 are equal；
The resistance R1, resistance R2, resistance R3 are sequentially connected in series, and resistance R1 is connect with power supply VCC, resistance R3 ground connection；
The positive feeder ear of the comparator N1 and comparator N2 is connect with power supply VCC, and negative feeder ear is grounded；The ratio
Noninverting input compared with device N1 is connected on the series circuit between resistance R1 and resistance R2；The reversed input of the comparator N2
End is connected on the series circuit between resistance R2 and resistance R3；
The reverse input end of the comparator N1 and the noninverting input of comparator N2 pass through resistance R5 connection power supply, and
Comparison signal is inputted by resistance R4；
The output end of the comparator N1 is connect with the output end of comparator N2.
It further, further include resistance R6, one end of the resistance R6 is connect with power supply VCC, the other end and comparator N1
It is connected with the output end of comparator N2.Resistance R6 is as pull-up resistor.
It further, further include capacitor C1, one end of the capacitor C1 is connect with the noninverting input of comparator N1, another
End ground connection.
It further, further include capacitor C2, one end of the capacitor C2 is connect with the reverse input end of comparator N2, another
End ground connection.
It further, further include capacitor C0, one end of the capacitor C0 is connect with the noninverting input of comparator N2, another
End ground connection.
It further, further include capacitor C3, the capacitor C3 is connected to the noninverting input and reversed input of comparator N1
Between end.
It further, further include capacitor C4, the capacitor C4 is connected to the noninverting input and reversed input of comparator N2
Between end.
Compared with prior art, beneficial effect is the utility model:
The symmetrical comparison circuit of the positive and negative two directions' inputing of the utility model can meet high speed, high-precision, high reliability simultaneously to be wanted
It asks, embodies in the following areas:
1) high speed: compared with tradition is with the two-way comparison circuit of absolute value circuit, absolute value circuit is eliminated, signal is logical
It crosses resistance and is directly entered comparator and compare, response speed block.
2) high-precision: positive and negative two-way relatively threshold value is symmetrical, and error is small.
3) high reliablity: eliminating negative supply in comparison circuit, entire circuit only includes 5 resistor R1、R2、R3、R4、R5
With 2 comparator N1、N2, structure is simple, high reliablity.
Detailed description of the invention
Fig. 1 is the existing two-way comparison circuit using absolute value circuit；
Fig. 2 is the existing two-way comparison circuit using dual power supply comparator；
Fig. 3 is the symmetrical comparison circuit of positive and negative two directions' inputing that the utility model embodiment 1 is powered based on single supply.
Fig. 4 is the symmetrical comparison circuit of positive and negative two directions' inputing that the utility model embodiment 2 is powered based on single supply.
Fig. 5 is the symmetrical comparison circuit of positive and negative two directions' inputing that the utility model embodiment 3 is powered based on single supply.
Specific embodiment
As shown in figure 3, the symmetrical comparison circuit of positive and negative two directions' inputing that the utility model is powered based on single supply, including power supply
VCC, comparator N1, comparator N2, resistance R1, resistance R2, resistance R3, resistance R4 and resistance R5；The resistance of resistance R1 and resistance R3
It is worth equal, the resistance value of resistance R4 and resistance R5 are equal.The positive feeder ear of comparator N1 and comparator N2 is connect with power supply VCC,
Negative feeder ear is grounded；Resistance R1, resistance R2, resistance R3 are sequentially connected in series, and resistance R1 is connect with power supply VCC, resistance R3 ground connection；
The noninverting input of comparator N1 is connected on the series circuit between resistance R1 and resistance R2；The reverse input end of comparator N2
It is connected on the series circuit between resistance R2 and resistance R3；The input in the same direction of the reverse input end and comparator N2 of comparator N1
End inputs comparison signal by resistance R4 by resistance R5 connection power supply；The output end and comparator N2 of comparator N1
Output end connection.
The comparison principle of the symmetrical comparison circuit of positive and negative two directions' inputing of the utility model single supply power supply is:
After the effect of power supply VCC, resistance value equal resistance R4 and resistance R5, it is input to the reversed input of comparator N1
The noninverting input of end and comparator N2 are compared；The comparison signal Vi of input changes are as follows:
Power supply VCC is divided through resistance R1, resistance R2, resistance R3, since resistance R1 is identical with the resistance value of resistance R3, because
This, the noninverting input of comparator N1 and the voltage of the reverse input end of comparator N2 are symmetrical about VCC/2.
The voltage of the noninverting input of comparator N1, the i.e. threshold value of comparator N1 are as follows:
The voltage of the reverse input end of comparator N2, the i.e. threshold value of comparator N2 are as follows:
When the voltage signal Vi of input meets relationshipWhen, comparator output 1；
When the voltage signal Vi of input meets relationshipWhen, comparator output 0；When the voltage signal Vi of input meets
RelationshipWhen, comparator output 0.
As shown in figure 3, being powered on resistance R6 in the output end of comparator N1 and comparator N2, resistance R6 is made as pull-up resistor
, it is not a necessary resistance, is selected according to different comparators, some comparators is needed plus pull-up resistor
High level can be exported, some comparators do not need.
As shown in figure 4, joined capacitor C1, capacitor C2 and C0, capacitor C1, capacitor on the basis of structure shown in Fig. 3
C2 is filter capacitor, and capacitor C0 and resistance R4 and R5 constitute filter circuit, can design the cutoff frequency value of needs.
As shown in figure 5, joined capacitor C3, capacitor C4 on the basis of structure shown in Fig. 4, while eliminating capacitor
C0, capacitor C3, capacitor C4 select the capacitance of tens pico farads, will not be delayed to the introducing of input signal, but can mention significantly
The anti-interference of high circuit.
Claims (7)
1. a kind of symmetrical comparison circuit of positive and negative two directions' inputing based on single supply power supply, it is characterised in that: including power supply VCC, ratio
Compared with device N1, comparator N2, resistance R1, resistance R2, resistance R3, resistance R4 and resistance R5, the resistance value of the resistance R1 and resistance R3
Equal, the resistance value of the resistance R4 and resistance R5 are equal；
The resistance R1, resistance R2, resistance R3 are sequentially connected in series, and resistance R1 is connect with power supply VCC, resistance R3 ground connection；
The positive feeder ear of the comparator N1 and comparator N2 is connect with power supply VCC, and negative feeder ear is grounded；The comparator
The noninverting input of N1 is connected on the series circuit between resistance R1 and resistance R2；The reverse input end of the comparator N2 connects
It connects on the series circuit between resistance R2 and resistance R3；
The reverse input end of the comparator N1 and the noninverting input of comparator N2 pass through resistance R5 connection power supply VCC, and
Comparison signal is inputted by resistance R4；
The output end of the comparator N1 is connect with the output end of comparator N2.
2. the positive and negative two directions' inputing symmetrical comparison circuit according to claim 1 based on single supply power supply, it is characterised in that:
It further include resistance R6, one end of the resistance R6 is connect with power supply VCC, and the other end is defeated with comparator N1's and comparator N2
Outlet connection.
3. the positive and negative two directions' inputing symmetrical comparison circuit according to claim 1 or 2 based on single supply power supply, feature exist
In:
It further include capacitor C1, one end of the capacitor C1 is connect with the noninverting input of comparator N1, other end ground connection.
4. the positive and negative two directions' inputing symmetrical comparison circuit according to claim 3 based on single supply power supply, it is characterised in that:
It further include capacitor C2, one end of the capacitor C2 is connect with the reverse input end of comparator N2, other end ground connection.
5. the positive and negative two directions' inputing symmetrical comparison circuit according to claim 4 based on single supply power supply, it is characterised in that:
It further include capacitor C0, one end of the capacitor C0 is connect with the noninverting input of comparator N2, other end ground connection.
6. the positive and negative two directions' inputing symmetrical comparison circuit according to claim 4 based on single supply power supply, it is characterised in that:
It further include capacitor C3, the capacitor C3 is connected between the noninverting input and reverse input end of comparator N1.
7. the positive and negative two directions' inputing symmetrical comparison circuit according to claim 6 based on single supply power supply, it is characterised in that:
It further include capacitor C4, the capacitor C4 is connected between the noninverting input and reverse input end of comparator N2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821373319.9U CN208782791U (en) | 2018-08-24 | 2018-08-24 | A kind of symmetrical comparison circuit of positive and negative two directions' inputing based on single supply power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821373319.9U CN208782791U (en) | 2018-08-24 | 2018-08-24 | A kind of symmetrical comparison circuit of positive and negative two directions' inputing based on single supply power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208782791U true CN208782791U (en) | 2019-04-23 |
Family
ID=66158144
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821373319.9U Active CN208782791U (en) | 2018-08-24 | 2018-08-24 | A kind of symmetrical comparison circuit of positive and negative two directions' inputing based on single supply power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208782791U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108923781A (en) * | 2018-08-24 | 2018-11-30 | 西安爱科赛博电气股份有限公司 | A kind of symmetrical comparison circuit of positive and negative two directions' inputing based on single supply power supply |
-
2018
- 2018-08-24 CN CN201821373319.9U patent/CN208782791U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108923781A (en) * | 2018-08-24 | 2018-11-30 | 西安爱科赛博电气股份有限公司 | A kind of symmetrical comparison circuit of positive and negative two directions' inputing based on single supply power supply |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106253671A (en) | A kind of internal ripple being applicable to COT control compensates circuit | |
| CN104967298B (en) | A kind of ripple compensation for DC DC converters controls circuit | |
| CN103499732B (en) | A kind of two-way zero-crossing testing circuit | |
| CN213843381U (en) | Alternating voltage sampling and zero-crossing detection circuit based on current transformer | |
| CN110162130A (en) | A kind of LDO circuit of power supply rejection ratio and transient response enhancing | |
| CN103970176B (en) | A kind of low-dropout linear voltage-regulating circuit and application system thereof | |
| CN208782791U (en) | A kind of symmetrical comparison circuit of positive and negative two directions' inputing based on single supply power supply | |
| CN207752063U (en) | A kind of isolation voltage sensor | |
| CN108923781A (en) | A kind of symmetrical comparison circuit of positive and negative two directions' inputing based on single supply power supply | |
| CN204615633U (en) | A kind of power circuit | |
| CN109387688A (en) | A kind of current detection circuit | |
| CN205317377U (en) | Pressure sensor based on linear opto -coupler | |
| CN210518267U (en) | Low-rate level conversion circuit | |
| CN103424598B (en) | Inversion system output voltage detecting circuit and inversion system | |
| CN106849667A (en) | A kind of primary side feedback constant pressure and flow controller sample circuit | |
| WO2020124899A1 (en) | Silicon controlled dimming active bleeder control circuit | |
| CN107194099B (en) | Memristor equivalent realization circuit based on passive filtering and bridge type rectification | |
| CN207021667U (en) | Bus current foldback circuit | |
| CN209928249U (en) | Switching value input signal circuit | |
| CN110233572A (en) | A kind of constant pressure source and constant-voltage outputting method | |
| CN210111844U (en) | Output voltage control circuit and electronic refrigerator power supply | |
| CN108039819A (en) | A kind of DC-DC boost converters output current sample circuit | |
| CN106885933B (en) | A kind of current sampling circuit suitable for Superbuck converter | |
| CN108418561A (en) | A kind of two level strapdown signal conditioning circuit of preposition amplification | |
| CN203606436U (en) | Node signal intensity detection circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20200508 Address after: 101149 Xiaobao village, Songzhuang Town, Tongzhou District, Beijing Patentee after: BEIJING LANJUN ELECTRICAL EQUIPMENT Co.,Ltd. Address before: 710119, No. 12, information Avenue, new industrial park, hi tech Zone, Shaanxi, Xi'an Patentee before: XI'AN ACTIONPOWER ELECTRIC Co.,Ltd. |
|
| TR01 | Transfer of patent right |