CN204990942U - Charge and discharge of capacitor demonstrates circuit - Google Patents
Charge and discharge of capacitor demonstrates circuit Download PDFInfo
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- CN204990942U CN204990942U CN201520761721.4U CN201520761721U CN204990942U CN 204990942 U CN204990942 U CN 204990942U CN 201520761721 U CN201520761721 U CN 201520761721U CN 204990942 U CN204990942 U CN 204990942U
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Abstract
The utility model provides a charge and discharge of capacitor demonstrates circuit, this circuit include RC charging and discharging circuit and voltage -controlled current source circuit, and it changes RC charging and discharging circuit's resistance drop into current output through a high input impedance's of design voltage -controlled electric current source, then utilize output current drive LED lamp to realize that RC fills discharge current to the transformation of LED lamp luminance, consequently can demonstrate the change that RC fills discharge current by LED lamp brightness flop. With the demonstration of imparting knowledge to students of this circuit, can make the student can observe charge and discharge of capacitor's electric current change rule more directly perceivedly to the help student understands capacitor charging and discharging circuit.
Description
Technical field
The utility model relates to a kind of capacitor for charging and discharging demonstration circuit of imparting knowledge to students, and belongs to electronic technology field.
Background technology
Capacitor charge and discharge circuit is a kind of important dynamic circuit, is usually used in square-wave oscillator circuit, waveform translation circuit and timing circuit, is one of main contents of circuit analysis course.Because the charging and discharging currents of electric capacity is smaller, or charge/discharge rates is than very fast, and capacitor charge and discharge phenomenon is not easily observed.In order to ocular demonstration capacitor charge and discharge phenomenon, particularly demonstrate the curent change rule of discharge and recharge, we are desirable to provide a kind of capacitor for charging and discharging demonstration circuit, for circuit analysis course teaching, help student to understand capacitor charge and discharge circuit.
Utility model content
The purpose of this utility model is to provide a kind of capacitor for charging and discharging demonstration circuit, for circuit analysis course teaching, helps student to understand capacitor charge and discharge circuit.
The concrete technical scheme that the utility model is taked is as follows:
A kind of capacitor for charging and discharging demonstration circuit, it is characterized in that: this circuit comprises RC charge-discharge circuit and voltage controlled current source circuit, wherein said RC charge-discharge circuit is provided with an either-or switch SW1, two selecting sides of interrupteur SW 1 connect+2.5V power end and ground end respectively, the common port of interrupteur SW 1 connects ground end after serial capacitance C1 and resistance R1 successively, the connecting line between electric capacity C1 and resistance R1 is also connected with a voltage output line, described voltage controlled current source circuit adopts double operational chip TL082 to provide amplifier U1, 3 pin of amplifier U1 are connected with the voltage output line of described RC charge-discharge circuit, 8 pin connect+9V power end, 4 pin connect-9V power end, NPN triode Q1 base stage and emitter are in parallel with the base stage of PNP triode Q2 and emitter respectively, base stage in parallel connects 1 pin of amplifier U1, emitter in parallel divides two-way, ground end is connect after one road series resistor R2, another road is connected with 2 pin of amplifier U1, the negative pole of the collector connecting luminous diode D1 of triode Q1, the positive pole of light emitting diode D1 connects+9V power end, the positive pole of the collector connecting luminous diode D2 of triode Q2, the negative pole of light emitting diode D2 connects-9V power end.
The utility model is by the voltage-controlled current source of a design high input impedance, the resistance drop of RC charge-discharge circuit is changed into electric current export, then output current driving LED lamp is utilized, thus realize the transformation of RC charging and discharging currents to LED brightness, therefore can by the change of LED brightness change demonstration RC charging and discharging currents.Carry out teaching demonstration with this circuit, student can be made to observe the curent change rule of capacitor charge and discharge more intuitively, thus help student to understand capacitor charge and discharge circuit.
Accompanying drawing explanation
Fig. 1 is circuit diagram of the present utility model.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described further.
As shown in Figure 1, this capacitor for charging and discharging demonstration circuit comprises RC charge-discharge circuit and voltage controlled current source circuit, wherein said RC charge-discharge circuit is provided with an either-or switch SW1, two selecting sides of interrupteur SW 1 connect+2.5V power end and ground end respectively, the common port of interrupteur SW 1 connects ground end after serial capacitance C1 and resistance R1 successively, the connecting line between electric capacity C1 and resistance R1 is also connected with a voltage output line, described voltage controlled current source circuit adopts double operational chip TL082 to provide amplifier U1, 3 pin of amplifier U1 are connected with the voltage output line of described RC charge-discharge circuit, 8 pin connect+9V power end, 4 pin connect-9V power end, NPN triode Q1 base stage and emitter are in parallel with the base stage of PNP triode Q2 and emitter respectively, base stage in parallel connects 1 pin of amplifier U1, emitter in parallel divides two-way, ground end is connect after one road series resistor R2, another road is connected with 2 pin of amplifier U1, the negative pole of the collector connecting luminous diode D1 of triode Q1, the positive pole of light emitting diode D1 connects+9V power end, the positive pole of the collector connecting luminous diode D2 of triode Q2, the negative pole of light emitting diode D2 connects-9V power end.
The light emitting diode D1 of this circuit is for demonstrating electric capacity C1 charging current, and light emitting diode D2 is for demonstrating electric capacity C1 discharge current, and either-or switch SW1 is used for the charging and discharging of control capacitance C1.
When interrupteur SW 1 connects+2.5V power end ,+2.5V power supply charges to electric capacity C1, and charging current is by dying down by force, and the pressure drop of resistance R1 is proportional to the change of charging current, and also by high step-down, become 0V from maximal value 2.5V, transformation period is proportional to charging rate R1C1.In charging process, the 3 pin normal phase input end voltages of amplifier U1 are the pressure drop of resistance R1, for positive voltage, amplifier U1, triode Q1, resistance R2, light emitting diode D1 form voltage-controlled current source, the electric current flowing through light emitting diode D1 is proportional to the 3 pin normal phase input end voltages of amplifier U1, therefore be also proportional to the pressure drop of resistance R1, be proportional to electric capacity C1 charging current.We can observe light emitting diode D1 by bright dimmed until the process of extinguishing thus.
When interrupteur SW 1 earth terminal, electric capacity C1 discharges through resistance R1, and discharge current is by dying down by force, and the pressure drop of resistance R1 is proportional to the change of discharge current, and also by high step-down, become 0V from maximal value 2.5V, transformation period is proportional to charging rate R1C1.At discharge process, the 3 pin normal phase input end voltages of amplifier U1 are the pressure drop of resistance R1, for negative voltage, amplifier U1, triode Q2, resistance R2, light emitting diode D2 form voltage-controlled current source, the electric current flowing through light emitting diode D2 is proportional to the 3 pin normal phase input end voltages of amplifier U1, therefore be also proportional to the pressure drop of resistance R1, be proportional to electric capacity C1 discharge current.We can observe light emitting diode D2 by bright dimmed until the process of extinguishing thus.
Claims (1)
1. a capacitor for charging and discharging demonstration circuit, it is characterized in that: this circuit comprises RC charge-discharge circuit and voltage controlled current source circuit, wherein said RC charge-discharge circuit is provided with an either-or switch SW1, two selecting sides of interrupteur SW 1 connect+2.5V power end and ground end respectively, the common port of interrupteur SW 1 connects ground end after serial capacitance C1 and resistance R1 successively, the connecting line between electric capacity C1 and resistance R1 is also connected with a voltage output line, described voltage controlled current source circuit adopts double operational chip TL082 to provide amplifier U1, 3 pin of amplifier U1 are connected with the voltage output line of described RC charge-discharge circuit, 8 pin connect+9V power end, 4 pin connect-9V power end, NPN triode Q1 base stage and emitter are in parallel with the base stage of PNP triode Q2 and emitter respectively, base stage in parallel connects 1 pin of amplifier U1, emitter in parallel divides two-way, ground end is connect after one road series resistor R2, another road is connected with 2 pin of amplifier U1, the negative pole of the collector connecting luminous diode D1 of triode Q1, the positive pole of light emitting diode D1 connects+9V power end, the positive pole of the collector connecting luminous diode D2 of triode Q2, the negative pole of light emitting diode D2 connects-9V power end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520761721.4U CN204990942U (en) | 2015-09-29 | 2015-09-29 | Charge and discharge of capacitor demonstrates circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520761721.4U CN204990942U (en) | 2015-09-29 | 2015-09-29 | Charge and discharge of capacitor demonstrates circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204990942U true CN204990942U (en) | 2016-01-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520761721.4U Withdrawn - After Issue CN204990942U (en) | 2015-09-29 | 2015-09-29 | Charge and discharge of capacitor demonstrates circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204990942U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105139734A (en) * | 2015-09-29 | 2015-12-09 | 广西职业技术学院 | Capacitor charging/discharging demonstration circuit |
-
2015
- 2015-09-29 CN CN201520761721.4U patent/CN204990942U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105139734A (en) * | 2015-09-29 | 2015-12-09 | 广西职业技术学院 | Capacitor charging/discharging demonstration circuit |
| CN105139734B (en) * | 2015-09-29 | 2017-12-01 | 广西职业技术学院 | A kind of capacitor for charging and discharging demonstration circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20160120 Effective date of abandoning: 20171201 |
|
| AV01 | Patent right actively abandoned |