CN203745607U - Switch input detection circuit - Google Patents
Switch input detection circuit Download PDFInfo
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- CN203745607U CN203745607U CN201420056688.0U CN201420056688U CN203745607U CN 203745607 U CN203745607 U CN 203745607U CN 201420056688 U CN201420056688 U CN 201420056688U CN 203745607 U CN203745607 U CN 203745607U
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Abstract
The utility model discloses a switch input detection circuit. Two switch elements can be used to acquire four kinds of output voltage, and false voltage level detection can be prevented. The switch input detection circuit provided by the utility model comprises a first resistor element with a grounded end, a first switch element, a second switch element with a grounded end, a second resistor element, a diode and a third resistor element. One end of the first switch element is connected with the other end of the first resistor element. One end of the second resistor element is connected with the other end of the second switch element. The diode is connected with an anode at the connection point of the first resistor element and the first switch element, and is connected with a cathode at the connection point of the second resistor element and the second switch element. One end of the third resistor element is connected with a power supply terminal. The other end of the first switch element, the other end of the second resistor element and the other end of the third resistor element are connected, and the connection point is connected with a micro computer A/D port.
Description
Technical field
The utility model relates to and a kind ofly to being supplied to the supply voltage of microcomputer, carries out dividing potential drop, and will by the voltage of dividing potential drop, be applied to the switch input detecting circuit of the A/D port of microcomputer.
Background technology
In the past, as utilizing resistance to carry out dividing potential drop to supply voltage according to the state of a plurality of switches (ON or OFF), and for being applied to the circuit of the A/D port of microcomputer (control part) by the voltage of dividing potential drop, the known switch input detecting circuit having as shown in Figure 3.
As the switch input detecting circuit 800 of the 1st past case shown in Fig. 3, have the supply voltage+V of microcomputer 801 is carried out to dividing potential drop, and this branch pressure voltage is applied to the resistor voltage divider circuit of the A/D port of microcomputer 801.This resistor voltage divider circuit comprises supply voltage+V is carried out a plurality of resistance R 801, R802, R803, R804 and the R805 that being one another in series of dividing potential drop connect and formed.And one end of a plurality of bond switching SW801, SW802, SW803 and SW804 mains side separately is connected with one end of the tie point of R805 and the ground side of R805 with tie point, the R804 of R804 with tie point, the R803 of R803 with R802 respectively.And a plurality of bond switching SW801, SW802, SW803 and the SW804 other end separately interconnect and are connected to ground.And, be configured to the A/D port that the voltage that is connected to the resistance R 801 of power supply+V and the tie point of resistance R 802 is applied to microcomputer 801.
For the action of simple declaration switch input detecting circuit 800, the switch input detecting circuit 900 as the 2nd past case shown in Figure 4.Switch input detecting circuit 900 is for to carry out dividing potential drop to the supply voltage+V of microcomputer 951, and this branch pressure voltage is applied to the circuit of the A/D port 953 of microcomputer 951.Switch input detecting circuit 900 is for having reduced the circuit of quantity of constitutive requirements of a part for the resistor voltage divider circuit that forms switch input detecting circuit 800, identical as the elemental motion of resistor voltage divider circuit.
Switch input detecting circuit 900 consists of a plurality of resistance R 901, R902 and the R903 connecting that be one another in series that the voltage+V of power supply terminal 952 is carried out to dividing potential drop, and consists of a plurality of interrupteur SW 901 and SW902.One end of interrupteur SW 901 is connected with resistance R 901, and its other end is connected with ground.And one end of interrupteur SW 902 is connected with the tie point of resistance R 902 with resistance R 901, its other end is connected with ground.And, be configured to the A/D port 953 that the voltage that one end is connected to the resistance R 903 of power supply terminal 952 and the tie point of resistance R 902 is applied to microcomputer 951.In addition, in switch input detecting circuit 900, can obtain 3 kinds of outputs, and set each resistance value of resistance R 901, resistance R 902 and resistance R 903 for 2 voltage level differences between these 3 kinds of outputs about equally.
For the action of switch input detecting circuit 900 is described, in Fig. 5 A, Fig. 5 B, with table and histogram, represent the output voltage V out with respect to the switch input detecting circuit 900 of the action of ON separately of interrupteur SW 901 and SW902 or OFF.In addition, by the voltage+V of power supply terminal 952, be that supply voltage is set as 5V.
In Fig. 5 A, state when pattern 1 represents that SW901 and SW902 are ON, branch pressure voltage determines by the ratio of the resistance value of R902 and the resistance value of R903, and determine R902 with the resistance value of R903 so that Vout now becomes 1.67V.Pattern 2 represents that SW901 are OFF and the SW902 state while being ON, and branch pressure voltage now determines by R902 and R903, and Vout becomes 1.67V.Mode 3 represents that SW901 is ON and the SW902 state while being OFF, and branch pressure voltage is determined with the ratio of the resistance value of R902 sum and the resistance value of R903 by R901, and determines the resistance value of R901 so that Vout now becomes 3.30V.State when pattern 4 expression SW901 and SW902 are OFF, the direct display power supply voltage of Vout now, therefore becomes 5.0V.In Fig. 5 B, in histogram, represent the value of the output voltage V out under these patterns.
As shown in Fig. 5 A, Fig. 5 B, in the SW901 of switch input detecting circuit 900 and the combination of SW902, there are 4 kinds from pattern 1 to pattern 4, from pattern 1, to pattern 4, output voltage V out can export 3 kinds of voltages.And the voltage level difference between each pattern is all about 1.7V, even and the value of this voltage level difference be to disturb from outside to output voltage V out stack, also can not produce the level difference of error detection.In addition, as the voltage level difference between each pattern, as long as think that being about 1V is exactly no problem level difference above.
Patent documentation 1:(Japan) JP 2000-155752 communique
Yet, in the switch input detecting circuit 900 shown in Fig. 4, though the combination of the ON/OFF of SW901 and SW902 is 4 kinds, as output voltage V out, only have 3 kinds.Therefore, effectively utilized hardly the combination between 2 switches.
As the switch input detecting circuit that has used 2 switches, it is also conceivable that the switch input detecting circuit 930 of the 3rd past case of the conduct shown in Fig. 6.By circuit being set as to this structure, and suitably set the resistance value of each resistance R 931, R932 and R933, can obtain 4 kinds of output voltages with respect to the combination of 4 kinds of patterns of SW931 and SW932.
In Fig. 7 A, Fig. 7 B, with table and histogram, represent the output voltage V out with respect to the switch input detecting circuit 930 of the action of ON separately of interrupteur SW 931 and SW932 or OFF.
As shown in Figure 7 A, 7 B, when wish utilizes switch input detecting circuit 930 to obtain 4 kinds of output voltages, be difficult to the voltage level difference between each pattern to be made as impartial value.And its result, can produce the very little situation of voltage level difference between each pattern.Therefore,, when stack is disturbed to output voltage from outside, likely can measure the voltage level to A/D port by flase drop.
Summary of the invention
The utility model proposes in view of the actual conditions of this conventional art, its object is to provide a kind of and can utilizes 2 on-off elements to obtain 4 kinds of output voltages, even and superpose and disturb from outside to output voltage, also can prevent the switch input detecting circuit of the error detection of voltage level.
In order to solve above-mentioned problem, switch input detecting circuit of the present utility model is for to carry out dividing potential drop to being supplied to the supply voltage of microcomputer, and the described voltage by dividing potential drop is applied to the switch input detecting circuit of the A/D port of described microcomputer, it has following feature, possess: the 1st resistive element, its one end is grounded; The 1st on-off element, its one end is connected with the other end of described the 1st resistive element; The 2nd on-off element, its one end is grounded; The 2nd resistive element, its one end is connected with the other end of described the 2nd on-off element; Diode is connected with anode on the tie point of described the 1st resistive element and described the 1st on-off element, and is connected with negative electrode on the tie point of described the 2nd resistive element and described the 2nd on-off element; And the 3rd resistive element, its one end is connected with power supply terminal, the other end of the other end of the other end of described the 1st on-off element, described the 2nd resistive element and described the 3rd resistive element is connected, and the tie point of described the 1st on-off element, described the 2nd resistive element and described the 3rd resistive element is connected with described A/D port.
The switch input detecting circuit of the present utility model with said structure utilizes diode, and the action according to 4 kinds of patterns that produced by the 1st on-off element and the 2nd on-off element, makes diode ON or OFF, can access thus 4 kinds of output voltages.And, diode is made as in the situation of OFF, while setting the resistance value of each resistive element, get rid of 1 resistive element in the 1st resistive element and the 2nd resistive element and consider, therefore can set like a cork the resistance value of each resistive element.And the output voltage owing to the 1st on-off element and the 2nd on-off element all can be made as to ON time is set as the forward drop of diode, therefore can drops at the forward voltage from diode in the wider voltage range of supply voltage and determine output voltage.Therefore, the voltage level difference between each output voltage can be made as to impartial value, and can obtain significantly the voltage level difference between each pattern.Its result, even when stack is disturbed to output voltage from outside, also can prevent the error detection of voltage level.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of the switch input detecting circuit of embodiment of the present utility model.
Fig. 2 A～Fig. 2 B is for representing table and the histogram with respect to the output voltage values of the switch input detecting circuit of each switch of the circuit diagram shown in Fig. 1 action separately.
Fig. 3 be the 1st past case the circuit diagram of switch input detecting circuit.
Fig. 4 is the circuit diagram of the switch input detecting circuit of the 2nd past case.
Fig. 5 A～Fig. 5 B is for representing table and the histogram with respect to the output voltage values of the switch input detecting circuit of each switch of the circuit diagram shown in Fig. 4 action separately.
Fig. 6 is the circuit diagram of the switch input detecting circuit of the 3rd past case.
Fig. 7 A～Fig. 7 B is for representing table and the histogram with respect to the output voltage values of the switch input detecting circuit of each switch of the circuit diagram shown in Fig. 6 action separately.
Mark in figure: R1 the 1st resistive element, R2 the 2nd resistive element, R3 the 3rd resistive element, SW1 the 1st on-off element, SW2 the 2nd on-off element, DI1 diode, 51 microcomputers, 52 power supply terminals, 53A/D port, 100 switch input detecting circuits.
Embodiment
Below, with reference to accompanying drawing, embodiment of the present utility model is described.Fig. 1 is the circuit diagram of the switch input detecting circuit 100 of embodiment of the present utility model.
The switch input detecting circuit 100 of embodiment of the present utility model is for to carry out dividing potential drop to being supplied to the supply voltage+V of microcomputer 51, and will by the voltage of dividing potential drop, be applied to the switch input detecting circuit of the A/D port 53 of microcomputer 51.
As shown in Figure 1, switch input detecting circuit 100 consists of the 1st resistive element R1, the 2nd resistive element R2, the 3rd resistive element R3, the 1st on-off element SW1, the 2nd on-off element SW2 and diode DI1.One end of the 1st resistive element R1 is grounded, and the other end of the 1st resistive element R1 is connected with one end of the 1st on-off element SW1.One end of the 2nd on-off element SW2 is grounded, and the other end of the 2nd on-off element SW2 is connected with one end of the 2nd resistive element R2.
The anode of diode DI1 is connected with the tie point of the 1st on-off element SW1 with the 1st resistive element R1, and the negative electrode of diode DI1 is connected with the tie point of the 2nd on-off element SW2 with the 2nd resistive element R2.And the 3rd one end of resistive element R3 and the power supply terminal of supply line voltage+V 52 are connected.And, the other end of the other end of the other end of the 1st on-off element SW1, the 2nd resistive element R2 and the 3rd resistive element R3 is connected, and the 1st on-off element SW1, the 2nd resistive element R2 and the tie point of the 3rd resistive element R3 and the A/D port 53 of microcomputer 51 are connected.
Switch input detecting circuit 100 outputs to A/D port 53 using the voltage by being connected in the resistance value of each resistive element between A/D port 53 and ground and the resistance value of the 3rd resistive element R3 the supply voltage+V of microcomputer 51 is carried out dividing potential drop as output voltage V out.The resistance value that is connected in each resistive element between A/D port 53 and ground is, by the ON of the 1st on-off element SW1 and the 2nd on-off element SW2 or ON or the OFF of OFF, diode DI1, and the resistance value of the resistance value of the resistance value of the 1st resistive element R1 or the 2nd resistive element R2 decision.
For the action of switch input detecting circuit 100 is described, in Fig. 2 A, Fig. 2 B, with table and histogram, represent the output voltage V out with respect to the switch input detecting circuit 100 of the action of ON separately of the 1st on-off element SW1 and the 2nd on-off element SW2 or OFF.In addition, in switch input detecting circuit 100, be designed to be able to obtain 4 kinds of output voltage V out.In the magnitude of voltage of output voltage V out, suitably set each resistance value of the 1st resistive element R1, the 2nd resistive element R2 and the 3rd resistive element R3, so that each voltage level difference between 4 kinds of output voltages about equally.In addition, by the voltage+V of power supply terminal 52, be that supply voltage is set as 5V.
In Fig. 2 A, state when pattern 1 represents that the 1st on-off element SW1 and the 2nd on-off element SW2 are ON, pattern 2 represents that the 1st on-off element SW1 are OFF and the 2nd on-off element SW2 state while being ON.And mode 3 represents that the 1st on-off element SW1 is ON and the 2nd on-off element SW2 state while being OFF, state when pattern 4 represents that the 1st on-off element SW1 and the 2nd on-off element SW2 are OFF.In Fig. 2 B, the value of the output voltage V out under these patterns shown in histogram.
In Fig. 2 A, pattern 1 time, because the 1st on-off element SW1 is ON, therefore the anode at diode DI1 is applied with supply voltage+V(5V).And because the 2nd on-off element SW2 is ON, so the negative electrode of diode DI1 is grounded via the 2nd on-off element SW2.Therefore, in diode DI1, have electric current to flow through, diode DI1 is in ON.Because diode DI1 is in ON, thus output voltage V out and the 1st resistive element R1, the 2nd resistive element R2 and the 3rd resistive element R3 resistance value separately irrelevant, and determined by the forward drop of diode DI1.Therefore, to become the forward drop of diode DI1 be 0.65V to output voltage V out.
In Fig. 2 A, pattern 2 times, because the 1st on-off element SW1 is OFF, therefore the anode at diode DI1 is not applied with supply voltage+V.And, because the 2nd on-off element SW2 is ON, therefore between A/D port 53 and ground, be only connected with the 2nd resistive element R2.Therefore,, as output voltage V out, show by the voltage of the 2nd resistive element R2 and the 3rd resistive element R3 dividing potential drop.
In Fig. 2 A, under mode 3, because the 1st on-off element SW1 is that ON and the 2nd on-off element SW2 are OFF, therefore between A/D port 53 and ground, be only connected with the 1st resistive element R1.Therefore,, as output voltage V out, show by the voltage of the 1st resistive element R1 and the 3rd resistive element R3 dividing potential drop.
In Fig. 2 A, pattern 4 times, because the 1st on-off element SW1 and the 2nd on-off element SW2 are OFF, therefore between A/D port 53 and ground, be connected with the circuit that is connected in series of the 1st resistive element R1, diode DI1 and the 2nd resistive element R2.Now, voltage is applied to the negative electrode of diode DI1 via the 3rd resistive element R3 and the 2nd resistive element R2, and its anode is grounded via the 1st resistive element R1.Therefore on diode DI1, be applied with reverse biased, thereby diode DI1 is in OFF state.Its result, does not have electric current to flow through between A/D port 53 and ground, so supply voltage+V is applied to A/D port 53 via the 3rd resistive element R3.Therefore, output voltage V out is shown as the voltage identical with supply voltage+V (5V).In Fig. 5 B, the value of the output voltage V out under these patterns is shown at histogram.
As mentioned above, pattern 1 time, output voltage V out shows the forward drop (0.65V) of diode DI1, pattern 4 times, shows the voltage (5V) identical with supply voltage+V.Therefore, can be by the forward drop from diode DI1 (0.65V) to supply voltage+V(5V) larger voltage difference be used for obtaining 4 kinds of output voltages.In order effectively to use from the forward drop (0.65V) of diode DI1 to supply voltage+V(5V) larger voltage difference, with by this voltage difference roughly the mode of 3 deciles determine output voltage V out under pattern 2 and the output voltage V out under mode 3.
In switch input detecting circuit 100, because the forward drop to from diode DI1 (0.65V) is to supply voltage+V(5V) voltage difference (4.35V) carry out 3 deciles, so the voltage level difference between each pattern is set and to be become 1.45V.
As mentioned above, in pattern, show by the voltage of the 2nd resistive element R2 and the 3rd resistive element R3 dividing potential drop for 2 times, under mode 3, show by the voltage of the 1st resistive element R1 and the 3rd resistive element R3 dividing potential drop.In the switch input detecting circuit 100 of present embodiment, pattern 2 times, consider to make voltage level difference between its and other pattern to become value described above (1.45V) and the ratio of setting the 2nd resistive element R2 and the resistance value of the 3rd resistive element R3.And, under mode 3, consider to make voltage level difference between its and other pattern to become above-mentioned value (1.45V) and the ratio of setting the 1st resistive element R1 and the resistance value of the 3rd resistive element R3.
Particularly, the output voltage under pattern 2 can be set as to Vout=0.65V+1.45V=2.10V, and the output voltage under mode 3 is set as to Vout=0.65V+2*1.45V=3.55V.Therefore, the resistance value of the 1st resistive element R1 is made as to r1, the resistance value of the 2nd resistive element R2 is made as to r2, when the resistance value of the 3rd resistive element R3 is made as to r3, can be made as r2/r3=2.10V/(5.0V-2.1V), and r1/r3=3.55V/(5.0V-3.55V).From this result, the ratio of r2 and r3 can be set as to r2/r3=0.72, and the ratio of r1 and r3 is set as to r1/r3=2.45.
And, the resistance value that determines the 3rd resistive element R3 by lowest high-current value that can be mobile in switch input detecting circuit 100 and minimum current value.The ratio of resistance value that can be by the 3rd resistive element R3, above-mentioned the 2nd resistive element R2 and the resistance value of the 3rd resistive element R3, and the ratio of the 1st resistive element R1 and the resistance value of the 3rd resistive element R3, obtain like a cork the resistance value of the 1st resistive element R1 and the resistance value of the 2nd resistive element R2.
Applicable above-mentioned the 1st resistive element R1 obtaining, the 2nd resistive element R2 and the 3rd resistive element R3 resistance value separately in the physical circuit of switch input detecting circuit 100, the pattern 2 and the output voltage V out under mode 3 that obtain become as the result of Fig. 2 A, Fig. 2 B.As from Fig. 2 A, Fig. 2 B, the output voltage V out under each pattern keeps respectively the voltage level difference of approximate equality.That is, can obtain significantly the voltage level difference between each pattern, even when stack is disturbed to output voltage V out from outside, also can prevent the error detection of voltage level.
As mentioned above, a kind of following switch input detecting circuit can be provided, be that switch input detecting circuit 100 of the present utility model utilizes diode DI1, according to the action of 4 kinds of patterns that produced by the 1st on-off element SW1 and the 2nd on-off element SW2, make diode DI1 in ON or OFF, can access thus 4 kinds of output voltage V out.And, in the situation that makes diode DI1 in OFF, while setting the resistance value of each resistive element, get rid of 1 resistive element in the 1st resistive element R1 and the 2nd resistive element R2 and consider, therefore can set like a cork the resistance value of each resistive element.And, output voltage V out owing to the 1st on-off element SW1 and the 2nd on-off element SW2 all can be made as to ON time is set as the forward drop of diode DI1, therefore can drop at the forward voltage from diode DI1 in the wider voltage range of supply voltage and determine output voltage.Therefore, the voltage level difference between each output voltage can be made as to impartial value, and can obtain significantly the voltage level difference between each pattern.Its result, even when stack is disturbed to output voltage V out from outside, also can prevent the error detection of voltage level.
Claims (1)
1. a switch input detecting circuit, it can carry out dividing potential drop to being supplied to the supply voltage of microcomputer, and the described voltage by dividing potential drop is applied to the A/D port of described microcomputer,
It is characterized in that possessing: the 1st resistive element, its one end is grounded; The 1st on-off element, its one end is connected with the other end of described the 1st resistive element; The 2nd on-off element, its one end is grounded; The 2nd resistive element, its one end is connected with the other end of described the 2nd on-off element; Diode is connected with anode on the tie point of described the 1st resistive element and described the 1st on-off element, and is connected with negative electrode on the tie point of described the 2nd resistive element and described the 2nd on-off element; And the 3rd resistive element, its one end is connected with power supply terminal,
The other end of the other end of the other end of described the 1st on-off element, described the 2nd resistive element and described the 3rd resistive element is connected, and the tie point of described the 1st on-off element, described the 2nd resistive element and described the 3rd resistive element is connected with described A/D port.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2013-000440 | 2013-01-07 | ||
| JP2013000440U JP3182794U (en) | 2013-01-30 | 2013-01-30 | Switch input detection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203745607U true CN203745607U (en) | 2014-07-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420056688.0U Expired - Fee Related CN203745607U (en) | 2013-01-30 | 2014-01-29 | Switch input detection circuit |
Country Status (2)
| Country | Link |
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| JP (1) | JP3182794U (en) |
| CN (1) | CN203745607U (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6726613B2 (en) * | 2016-12-19 | 2020-07-22 | アルプスアルパイン株式会社 | Switch operation device and power window control device |
| JP6795965B2 (en) * | 2016-12-19 | 2020-12-02 | アルプスアルパイン株式会社 | Switch operating device and power window control device |
-
2013
- 2013-01-30 JP JP2013000440U patent/JP3182794U/en not_active Expired - Lifetime
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2014
- 2014-01-29 CN CN201420056688.0U patent/CN203745607U/en not_active Expired - Fee Related
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| Publication number | Publication date |
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| JP3182794U (en) | 2013-04-11 |
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Address after: Tokyo, Japan Patentee after: ALPS ELECTRIC Co.,Ltd. Address before: Tokyo, Japan Patentee before: Alps Electric Co.,Ltd. |
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| CP01 | Change in the name or title of a patent holder | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140730 |
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| CF01 | Termination of patent right due to non-payment of annual fee |