CN1201147A - Voltage-change detecting circuit and input device of alarm thereof - Google Patents
Voltage-change detecting circuit and input device of alarm thereof Download PDFInfo
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- CN1201147A CN1201147A CN 97106664 CN97106664A CN1201147A CN 1201147 A CN1201147 A CN 1201147A CN 97106664 CN97106664 CN 97106664 CN 97106664 A CN97106664 A CN 97106664A CN 1201147 A CN1201147 A CN 1201147A
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Abstract
The voltage fluctuation detection circuit includes operation amplifiers A1 and A2, divider resistors R1, R2, R3, R4 and R5 and capacitor C1. When the voltage of input end is raised to a sufficient value or reduced to a sufficient value, the output end outputs a negative triggering signal, then it can be restored to initial state after the capacitor is charged. The on-and-off sensor is series-connected with a resistor, and is parallel-connected with divider resistor R1, an alarm input device can be formed.
Description
The present invention relates to a kind of testing circuit of change in voltage and use the input device of alarm that this circuit is formed.
General input device of alarm adopts devices such as mercury contact switch, metal balls switch, tongue tube to take on.When the input media on-off, provide trigger pip.This input media can only send the monotonic transformation signal, for example becomes high-tension signal from low-voltage, and can't automatically restore to original state.
The objective of the invention is to propose a kind of voltage-change detecting circuit, when detected change in voltage, can export trigger pip and, can automatically restore to original state after change is stable, another object of the present invention is the structure that proposes to use the input device of alarm that this kind circuit makes.
This voltage-change detecting circuit comprises two operational amplifier A 1, A2, divider resistance R1, R2, R3, R4, R5 and capacitor C1.Receive between the positive and negative electrode of power supply after divider resistance R1, R2, the R3 series connection, the positive input terminal of operational amplifier A 1 is received the junction of divider resistance R1 and R2, and as signal input part, the negative input end of this operational amplifier A 1 links to each other with the positive input terminal of another operational amplifier A 2, and is connected with power supply negative terminal by capacitor C 1.The negative input end of operational amplifier A 2 is received the junction of divider resistance R2 and R3, and divider resistance R4 jumps on two input ends of operational amplifier A 1.Divider resistance R5 jumps on two input ends of operational amplifier A 2, after the output terminal parallel connection of two operational amplifier A 1, A2 as the output terminal of whole voltage-change detecting circuit.
After this voltage-change detecting circuit energized because the dividing potential drop effect of divider resistance R1, R2, R3, R4, R5, make the positive input terminal current potential of operational amplifier A 1 be higher than negative input end, the positive input terminal current potential of A2 also is higher than negative input end, therefore, the output terminal of two operational amplifiers is all noble potential, whole voltage-change detecting circuit output noble potential.When the voltage of input end rises an enough value, the negative input end current potential of operational amplifier A 2 rises, but because the positive input terminal of operational amplifier A 2 connects power cathode by capacitor C 1, the current potential of positive input terminal can not change at once, cause the negative input end current potential of operational amplifier A 2 to be higher than positive input terminal, its output terminal just changes and becomes electronegative potential, is in conducting state over the ground (this is that the structure of operational amplifier itself makes so).The output terminal that whole voltage changes testing circuit also just becomes electronegative potential, that is exports a negative trigger pip.Along with the charging of capacitor C 1, the positive input terminal voltage of A2 raises, and reaches when stablizing, and the current potential of its positive input terminal is higher than negative input end, and the output terminal of A2 returns to noble potential again.Another kind of situation is: enough values if the input end current potential descends, voltage is redistributed, the positive input terminal voltage of operational amplifier A 1 reduces, negative input end because of it also links to each other with power cathode by capacitor C 1 again, voltage can not suddenly change, the negative input end current potential of A1 is higher than positive input terminal, and the output terminal of A1 is reduced to electronegative potential (with the ground conducting), and this voltage-change detecting circuit is also exported a negative trigger pip.Along with the discharge of capacitor C 1, return to original state more then.From the above, when this voltage-change detecting circuit changes at the voltage of input end, no matter be to raise or reduction, can both export a trigger pip.After input terminal voltage is stable, can automatically restore to original state again.
Accompanying drawing 1 is the schematic diagram of this voltage-change detecting circuit;
Accompanying drawing 2 is the another kind of schematic diagram of this voltage-change detecting circuit;
Accompanying drawing 3 is made the schematic diagram of input device of alarm for using this voltage-change detecting circuit;
Accompanying drawing 4 is the another kind of structural drawing of input device of alarm;
Accompanying drawing 5 is the schematic diagram of the alarm of this input device of alarm of application.
As shown in Figure 1, this voltage-change detecting circuit comprises operational amplifier A 1, A2, divider resistance R1, R2, R3, R4, R5 and capacitor C1.Receive between the positive and negative electrode of power supply after divider resistance R1, R2, the R3 series connection, the positive input terminal of operational amplifier A 1 and the negative input end of A2 are connected across the two ends of divider resistance R2, and the positive input terminal 7 of A1 is as signal input part.After linking to each other with the positive input terminal of A2, the negative input end of operational amplifier A 1 links to each other with the negative pole of power supply by capacitor C 1.Divider resistance R4 jumps on two input ends of operational amplifier A 1, and R5 is connected across on two input ends of A2, after the output terminal parallel connection of A1, A2 as output terminal 3.
As shown in Figure 2, if the positive input terminal of A2 is received the positive pole of power supply by capacitor C 1, effect also is identical.In addition, the negative input end 8 of operational amplifier A 2 also can be used as signal input part.
As shown in Figure 3, if with an on-off type sensor 1 be parallel on the R1 after a resistance 2 is connected, this circuit just becomes an input device of alarm: at on-off type sensor 1 when disconnection transfers closure to, the last resistance of the last parallel connection of R1, voltage is redistributed, input end 7 voltages are reduced, trigger pip of this circuit output.When on-off type sensor 1 transfers to when disconnecting from closure, the parallel resistance on the R1 disconnects, and voltage is also from new distribution, and input end 7 voltages raise, and this circuit is also exported a trigger pip.If alarm is installed on the case and bag, when case and bag are moved, can cause on-off type sensor closure, promptly play the effect of case and bag burglar alarm.
As shown in Figure 3, the on-off type sensor 1 in this input device of alarm can have more than two.Each on-off type sensor be parallel to divider resistance R1 after a resistance is connected again and go up (or on R3).Owing to promptly automatically restore to original state after this input device of alarm whenever sends a trigger pip, these on-off type sensors in parallel mutually can independently work separately, can not interfere with each other.If these on-off type sensors by the installing of different orientation, are sent the effect of alerting signal in the time of can obtaining inclination, the vibration in multiple angles.If each on-off type sensor is installed in positions different in the room, for example a plurality of tongue tube sensors are installed on each door and window in the room, can realize that indoor multipoint detects the purpose of burglar alarm with same alarm.
Operational amplifier A 1, A2 can select the LM393 integrated package for use, and the voltage difference of positive and negative input end is during greater than 5my, and output terminal is promptly turning.As R1=100K, R2=720 Europe, R3=10K, R4=R5=5.6K, the resistance of the resistance in series 2 of on-off type sensor is selected 560K for use, and when supply voltage was 3V, two operational amplifier input terminal voltage values were when each on-off type sensor was closed:
| The closed number of on-off type sensor | With resistance value (K Ω) after R1 is in parallel | A1 positive input terminal voltage (my) | A1 negative input end A2 positive input terminal voltage (mv) | A2 negative input end voltage (mv) |
| ????0 | ????100 | ????289.5 | ????280.3 | ????271.1 |
| ????1 | ????84.85 | ????335.4 | ????326.0 | ????314.0 |
| ????2 | ????73.68 | ????379.8 | ????367.7 | ????355.6 |
| ????--- | ????--- | ????--- | ????--- | ????--- |
| ????7 | ????44.44 | ????581.3 | ????562.8 | ????544.3 |
| ????8 | ????47.18 | ????617.8 | ????598.2 | ????578.5 |
| ????9 | ????38.36 | ????653.3 | ????632.6 | ????611.8 |
When ten on-off type sensors in parallel connection, whenever having a sensor to change on off operating mode as can be known from the above table, can guarantee that all A1 or A2 have enough input voltages poor, make the output terminal level from high step-down, thereby export a negative pulse.When supply voltage is obtained when higher, can in parallel more simultaneously on-off type sensor.
As shown in Figure 4, the output terminal of operational amplifier A 1, A2 can also be received respectively on capacitor C 7, the C8, and the other end of capacitor C 7, C8 also connects the output terminal of back as the alarm output unit.Capacitor C 7, C8 separate direct current, only pass through pulse signal.The positive and negative input end of operational amplifier A 1, A2 can also be intercoursed the position as shown in the figure, can obtain positive triggering pulse at output terminal like this.
An example that is the alarm that has used this input device of alarm shown in Figure 5.Be the warning input media among the figure in the frame of broken lines.Its output terminal is received the electronegative potential trigger end of gate element 4 and is 2. gone up, and 3. the output terminal of gate element receives the control end of music-integrating block 5, and the output terminal of music-integrating block is received the base stage of power discharging transistor.6 is sounding component.
Base integrated package when gate element 4 can adopt CMOS7555,4. pin is a reset terminal, and the charging circuit that R6, C3 form plays the start time-delay, and 4. pin electronegative potential during start makes the integrated package forced resetting, and output terminal 3. pin is an electronegative potential.2. pin is the low level trigger end, be subjected to low trigger pulse that input device of alarm transmits after, 3. pin promptly transfers high level to, make music-integrating block 5 electric, produce alerting signal, through amplifying, send chimes of doom by sounding component 6.6. pin is the high level trigger end, and 7. pin is a discharge end, and this bipod is received the tie point of R8 and C5 together, play the effect of delay recovery: when 2. pin was not subjected to the negative pulse triggering, 7. pin led to no-voltage on the capacitor C 5 with ground, 2. after pin is triggered by negative pulse, the circuit upset, 7. pin does not lead to ground, and power supply is by 5 chargings of 8 pairs of capacitor C of resistance R, when voltage is charged to when enough high, 6. pin is triggered, and circuit is overturn once more, returns to standby condition.
Claims (6)
1, a kind of voltage-change detecting circuit, comprise two operational amplifier A 1, A2, divider resistance R1, R2, R3, R4, R5 and capacitor C1, it is characterized in that divider resistance R1, R2, just receiving power supply after the R3 series connection, between the negative pole, the positive input terminal of operational amplifier A 1 is received the junction of divider resistance R1 and R2, and as signal input part (7), the negative input end of this operational amplifier A 1 links to each other with the positive input terminal of another operational amplifier A 2, and join by capacitor C 1 and power cathode, the negative input end of operational amplifier A 2 is received the junction of divider resistance R2 and R3, divider resistance R4 jumps on two input ends of operational amplifier A 1, divider resistance R5 jumps on two input ends of operational amplifier A 2, two operational amplifier A 1, after the output terminal parallel connection of A2 as the output terminal (3) of whole voltage-change detecting circuit.
2, a kind of input device of alarm comprises the described voltage-change detecting circuit of claim 1, it is characterized in that it also comprises on-off type sensor (1), and this on-off type sensor is with in parallel with divider resistance R1 again after a resistance (2) is connected.
3, input device of alarm as claimed in claim 2 is characterized in that described on-off type sensor has more than two, each on-off type sensor be parallel to again on the divider resistance R1 after a resistance is connected.
4,, be parallel on the divider resistance R3 after it is characterized in that described on-off type sensor (1) and resistance (2) being connected as claim 2 or 3 described input device of alarm.
5, as claim 2 or 3 described input device of alarm, it is characterized in that an end of described capacitor C 1 links to each other with the positive input terminal of A2, the other end links to each other with the positive pole of power supply.
6, as claim 2 or 3 described input device of alarm, the output terminal that it is characterized in that described operational amplifier A 1, A2 receive respectively capacitor C 7, C8 on, capacitor C 7, the C8 other end also connect the output terminal of back as input device of alarm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 97106664 CN1077688C (en) | 1996-10-23 | 1997-10-17 | Voltage-change detecting circuit and input device of alarm thereof |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN96222062 | 1996-10-23 | ||
| CN96222062.0 | 1996-10-23 | ||
| CN 97106664 CN1077688C (en) | 1996-10-23 | 1997-10-17 | Voltage-change detecting circuit and input device of alarm thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1201147A true CN1201147A (en) | 1998-12-09 |
| CN1077688C CN1077688C (en) | 2002-01-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 97106664 Expired - Fee Related CN1077688C (en) | 1996-10-23 | 1997-10-17 | Voltage-change detecting circuit and input device of alarm thereof |
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| Country | Link |
|---|---|
| CN (1) | CN1077688C (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102445583A (en) * | 2010-10-13 | 2012-05-09 | 深圳市领步科技有限公司 | Detection method for voltage signals of power energy quality monitoring device and circuit as well as application thereof |
| CN109030929A (en) * | 2018-07-06 | 2018-12-18 | 杰华特微电子（杭州）有限公司 | load insertion detection circuit and method |
| CN116165420A (en) * | 2023-04-20 | 2023-05-26 | 杭州瑞盟科技股份有限公司 | Current detection circuit and device |
-
1997
- 1997-10-17 CN CN 97106664 patent/CN1077688C/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102445583A (en) * | 2010-10-13 | 2012-05-09 | 深圳市领步科技有限公司 | Detection method for voltage signals of power energy quality monitoring device and circuit as well as application thereof |
| CN109030929A (en) * | 2018-07-06 | 2018-12-18 | 杰华特微电子（杭州）有限公司 | load insertion detection circuit and method |
| CN109030929B (en) * | 2018-07-06 | 2024-05-24 | 杰华特微电子股份有限公司 | Load insertion detection circuit and method |
| CN116165420A (en) * | 2023-04-20 | 2023-05-26 | 杭州瑞盟科技股份有限公司 | Current detection circuit and device |
| CN116165420B (en) * | 2023-04-20 | 2023-10-03 | 杭州瑞盟科技股份有限公司 | Current detection circuit and device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1077688C (en) | 2002-01-09 |
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