TH12865C3 - Capacitance Measurement Experiment Kit Based on the principle of charge division - Google Patents

Abstract

Capacitance Measurement Experiment Set Based on the principle of charge division According to this invention, it consists of an 8-pin relay, a DC voltage source. Electronic switches, diodes, capacitors, 2 resistors and voltage detectors. Where the first capacitor is used by the experimenter Know the preset or know the value directly from the meter measurement. The second capacitor is a capacitor that Want to measure the value from the experimental operation This is based on the principle of sharing the charge between the two capacitors, in the final state when the two capacitors are connected in parallel The results of the measurement of voltage values at Across two capacitors are equal. In which the experimenter can rely on the aforementioned voltage To calculate back to the desired electrical capacitance A key feature of this invention is the use of an 8-pin relay to control the opening and closing timing of the circuit between the two capacitors.

Claims (2)

Disclaimer (all), which will not appear on the advertisement page: Edit 10/10/2016 1. Experimental point for measuring capacitance using the principle of charge sharing. It is characterized by an 8-pin relay (1), DC voltage source (2), electronic switch (3), diode (4), first capacitor (5), second capacitor. (6) A resistor (7) and a voltage measuring device (8) with one end of the input voltage input (11) of the 8-pin relay (1) connected to the cathode pin (41) of the diode. (4) and connected to the positive pole of the DC voltage source (2) the reverse input voltage pin (12) of the 8 pin relay (1) connected to the anode pin (42) of the diode (4) and Operating pin on one side (31) of the electronic switch (3) with the other end (32) of the electronic switch (3) connected to system ground (100), normally closed pin (Nc). The one (13) of the 8-pin relay (1) is connected to the positive terminal of DC voltage source (2), the second normally closed pin (16) of the 8 pin relay (1) is connected to system ground (100) normally open pin (No) at one (15) and The second normally open pin (18) of the 8 pin relay (1) is connected via a resistor (7), the resistor (7) serves to limit the current. It flows between the first (5) capacitor and the second capacitor (6). The first (14) of the 8 pin relay (1) is connected to the capacitor that One (5) second common pin (17) of the 8 pin relay (1) is connected to the second capacitor (6) with the other pin being used. The rest of the two capacitors (5) and (6) are connected to system ground (100), given that the magnitude of the voltage from the DC voltage source (2) is equal to Vcc (200). The size of the first capacitor (5) is equal to Cr (50), the size of the second capacitor (6) is equal to Cx (60). Opening the electronic switch (3) will cause no current to flow through it. The two input pins (11) and (12) of the 8-pin relay (1) have the effect of making one common pin (14) connected to the one normally closed pin (13) and the second common pin (17) connected. With the second normally closed pin (16), the voltage Vcr (300) across the first capacitor (5) is equal to Vcc (200) and the voltage Vcx (400) is obtained across it. The second capacitor (6) is equal to zero. Closing the electronic switch circuit (3) causes a current to flow through both the input pins (11) and (12) of the 8-pin relay (1), resulting in five that the first common pin (14) is connected to the normally open pin. The first (15) and second common pin (17) are connected to the second normally open pin (18). The first (5) capacitor shares the accumulated charge. For the second capacitor (6), the voltage Vcx (400) and the voltage Vcr (300) are equal according to the relationship: Vcx = Vcr = (CrVcc) / (Cr + Cx) ------------------------------------- 1. Experiment set for measuring capacitance using the principle of charge division It is unique in that it consists of an 8-pin relay (1), a DC voltage source (2), an electronic switch (3), a diode (4), a first capacitor (5), a second (6) a capacitor. Resistor (7) and voltage sensing device (8), where one side of the 8-pin relay (1) is connected to the cathode pin (41) of the diode (4), and Connect to DC voltage source positive terminal (2), opposite input voltage input (12) of 8 pin relay (1) to anode pin (42) of diode (4) and use side One (31) of the electronic switch (3) with the other side active pin (32) of the electronic switch (3) connected to system ground (100) NC1 pin (13) of the 8 pin relay (1). Connect to DC voltage source positive terminal (2), pin NC2 (16) of 8 pin relay (1) to system ground (100), pin NO1 (15) and pin NO2 (18) of type relay. The 8 pins (1) are connected via resistor (7), resistor (7) limits the amount of current flowing between the first capacitor (5) and the second capacitor (6 ) Pin C1 (14) of 8 pin relay (1) is connected to The first capacitor (5) pin C2 (17) of the 8 pin relay (1) is connected to the second capacitor (6), with the other end of both the capacitor pin being used on the other side. (5) and (6) connected to system ground (100) The magnitude of the voltage from the DC voltage source (2) is equal to Vcc (200), the size of the first capacitor ( 5) is equal to C (50), the size of the second capacitor (6) is equal to Cx (60). 2. How to use the electrical capacitance measurement experiment set Based on the principle of charge sharing according to claim 1, there are steps as follows: Step one Begin by opening the electronic switch circuit (3) so that no current flows. Through the two input pins (11) and (12) of the 8 pin relay (1), pin C1 (14) is connected to pin NC1 (13) and pin C2 (17) is connected to pin NC2 (16). This gives the voltage Vcr (300) across the first (5) capacitor is equal to Vcc (200) and the voltage Vcx (400) across the second capacitor (6). Is equal to zero Second step Close the electronic switch circuit (3) which will cause current to flow through the pin. Both inputs (11) and (12) of the 8-pin relay (1) have the effect of making pin C1 (14) connected to pin NO1 (15) and pin C2 (17) to pin NO2 (18). The first (5) charge shares the accumulated charge. For the second capacitor (6), the voltage Vcx (400) and the voltage Vcr (300) are equal according to the relationship: Vcx = Vcr (CrVcc) / (Cr + Cx ) By weavers can measure Using a voltage measuring device (8)