Super capacitor identification circuit

Abstract

The utility model relates to the technical field of super-capacitors, and particularly discloses a super-capacitor identification circuit which is low in cost of a test system, has no requirement on the position of a super-capacitor and is reliable in identification result. The super capacitor identification circuit comprises a switching circuit connected with a super capacitor to be detected, a charging circuit and a voltage comparison circuit, and the charging circuit and the voltage comparison circuit are arranged in parallel and connected with the switching circuit. The charging circuit comprises a charging power supply used for providing charging voltage and a charging resistor arranged on a connecting line of the charging power supply and the relay, the voltage comparison circuit comprises a voltage comparator and a power supply, and the inverted input end of the voltage comparator is electrically connected with the relay. The in-phase input end of the voltage comparator is electrically connected with the power supply, the output end of the voltage comparator is electrically connected with external processing equipment or display equipment, and a voltage division sub-circuit is arranged on a connecting line of the voltage comparator and the power supply.

Description

TECHNICAL FIELD

[0001] The utility model relates to super capacitor technical field especially relates to a super capacitor identification circuit. BACKGROUND

[0002] Ultracapacitor (ultracapacitor) is also called super capacitor, electrochemical capacitor, double-layer capacitor or F capacitor, it is a kind of between traditional capacitor and battery, with special performance power supply, it mainly relies on double electric layer and redox false capacitor charge and stores electric energy, energy storage process is reversible, can repeatedly charge and discharge hundreds of thousands of times, with the advantages of high power density, short charge and discharge time, long cycle life and wide working temperature range.In the ultracapacitor monomer or module factory, the ultracapacitor monomer or module needs to be tested to ensure its stable performance and qualified quality.In the ultracapacitor monomer or module test, multiple same stations are often set in the test system to test multiple ultracapacitors simultaneously or in time, thereby improving test efficiency.However, not all stations in the test system will place ultracapacitors during actual testing, therefore, before testing operation, the station where ultracapacitors are placed needs to be identified to accurately test.At present, the industry mainly identifies ultracapacitors by setting proximity sensors at test stations, and the setting of proximity sensors increases the cost of test system, and the identification of proximity sensors has high requirements for ultracapacitor position, and is prone to inaccurate identification or identification failure, thereby reducing the accuracy of identification results and affecting the normal operation of ultracapacitor test. SUMMARY

[0003] Therefore, it is necessary to provide a super capacitor identification circuit with low test system cost, no requirement for ultracapacitor position and reliable identification result.

[0004] A super capacitor identification circuit, comprising a switch circuit connected with a to-be-tested ultracapacitor, a charging circuit and a voltage comparison circuit connected with the switch circuit in parallel, the switch circuit comprises a relay, the charging circuit comprises a charging power supply for providing a charging voltage and a charging resistor arranged on a connection line between the charging power supply and the relay, the voltage comparison circuit comprises a voltage comparator and a power supply, the opposite phase input end of the voltage comparator is electrically connected with the relay, the same phase input end of the voltage comparator is electrically connected with the power supply, the output end of the voltage comparator is electrically connected with an external processing device or a display device, and a voltage dividing subcircuit is arranged on the connection line between the voltage comparator and the power supply.

[0005] In one of the embodiments, the voltage dividing sub-circuit comprises a first voltage dividing resistor arranged on a voltage comparison circuit and a power supply connection line, and a second voltage dividing resistor connected in parallel with the first voltage dividing resistor and grounded, and the second voltage dividing resistor is electrically connected with a non-inverting input terminal of the voltage comparison circuit.

[0006] In one of the embodiments, the first voltage dividing resistor has a resistance of 8kΩ-12kΩ, and the second voltage dividing resistor has a resistance of 100Ω-10kΩ.

[0007] In one of the embodiments, the charging resistor has a resistance of 8-12Ω.

[0008] In one of the embodiments, the charging power supply has a voltage of 1V.

[0009] In one of the embodiments, the power supply has a voltage of 3.3V.

[0010] The super capacitor recognition circuit of the utility model is charged by the charging circuit, the voltage changes slowly during the charging process of the super capacitor, the initial voltage is close to 0V, the voltage comparison is carried out by the voltage comparison circuit, the super capacitor with the initial voltage close to 0V connected in the test system can be recognized, that is, whether the super capacitor with the initial voltage close to 0V is correctly connected in the station can be recognized, the additional proximity sensor is not needed, the cost of the test system is reduced, the position of the super capacitor is not required, the test station can be flexibly set, the recognition result is not disturbed by the position of the super capacitor, the reliability and accuracy of the recognition result are improved, and the normal operation of the super capacitor test operation is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0011] Figure 1 The module connection diagram of the super capacitor recognition circuit in one of the embodiments of the utility model;

[0012] Figure 2 The circuit principle diagram of the super capacitor recognition circuit in one of the embodiments of the utility model. DETAILED DESCRIPTION

[0013] In order to make the above-mentioned purpose, features and advantages of the utility model more obvious and easy to understand, the specific embodiments of the utility model are described in detail below in combination with the drawings. In the following description, a lot of specific details are set forth in order to fully understand the utility model. However, the utility model can be implemented in many other ways different from the description herein, and those skilled in the art can make similar improvements without departing from the connotation of the utility model, so the utility model is not limited by the following disclosed specific embodiments.

[0014] Please combine Figure 1 with Figure 2The utility model discloses a kind of supercapacitor identification circuits of low cost test system, no requirement to supercapacitor position, reliable identification result, which comprises switch circuit 100 connected with the supercapacitor 10 (i. Figure 2 To be measured (i. Figure 2 J1 in), the charging circuit 200 and voltage comparison circuit 300 are connected with switch circuit 100, the charging circuit 200 includes charging power supply 210 for providing charging voltage (Vcharge), charging resistor 220 (i. Figure 2 R1 in) is arranged on the connecting line of charging power supply 210 and relay 110, the voltage comparison circuit 300 includes voltage comparator 310 and power supply 320 (the power supply voltage provided by power supply 320 is VCC), the inverting input end (-end) of voltage comparator 310 is electrically connected with relay 110, the noninverting input end (+end) of voltage comparator 310 is electrically connected with power supply 320, the output end (Vout end) of voltage comparator 310 is electrically connected with external processing device or display device, so that external processing device sends signal to test unit according to supercapacitor identification result, and carries out supercapacitor performance test, or display identification result. Voltage comparator 310 and power supply 320 are provided with voltage dividing subcircuit 330 on the connecting line. In the embodiment, the power supply voltage provided by power supply 320 is reference voltage after being divided by voltage dividing subcircuit 330, and the reference voltage is the input voltage of the noninverting input end of voltage comparator 310. By setting voltage dividing subcircuit 330, the input voltage supplied by power supply 320 to the noninverting input end of voltage comparator 310 is reduced, so that the input voltage can be used as the reference voltage for judging that the initial voltage of supercapacitor is close to 0V. Since the capacitance value of supercapacitor is very large, usually greater than 1F, when charging the supercapacitor 10 to be measured by charging power supply 210, the voltage change of supercapacitor will be very slow, therefore, the initial voltage (i.

[0015] When the super capacitor 10 to be tested is identified, the relay 110 is first closed, so that the charging power supply 210 charges the super capacitor 10 to be tested, and after a certain time delay, the same-phase input end and the opposite-phase input end of the voltage comparator 310 receive voltage signals, when the voltage (VA) of the same-phase input end of the voltage comparator 310 is greater than the voltage (VB) of the opposite-phase input end of the voltage comparator 310, the output end Vout of the voltage comparator 310 outputs a high level; otherwise, when the voltage (VB) of the opposite-phase input end of the voltage comparator 310 is greater than the voltage (VA) of the same-phase input end of the voltage comparator 310, the output end Vout of the voltage comparator 310 outputs a low level. In this way, by checking the output level of the output end Vout of the voltage comparator 310, when the output level is a low level, it indicates that there is a super capacitor on the work station of the test system; otherwise, there is no super capacitor.

[0016] The charging power supply 210 is used to provide a charging voltage (Vcharge) to the super capacitor 10 to be tested, and the voltage of the charging power supply 210 can be selected from one of 1V, 1.5V, 2V, 2.4V, 3.2V, 3.7V and 4.2V. Preferably, in the embodiment, the voltage of the charging power supply 210 is 1V, that is, the charging voltage provided by the charging power supply 210 to the super capacitor 10 to be tested is 1V. The charging resistor 220 is used to control the size of the charging current, prevent the charging power supply 210 from overheating and damage, and ensure the safety of charging; in addition, the charging resistor 220 can also stabilize the voltage to prevent the voltage from being too high or too low, and it stabilizes the voltage by consuming excess current to protect the charging power supply 210. In the embodiment, the resistance value of the charging resistor 220 is 8-12Ω. Preferably, the resistance value of the charging resistor 220 is 10Ω.

[0017] The power supply 320 is used to provide a source voltage to the same-phase input end of the voltage comparator 310, and preferably, the voltage of the power supply 320 is 3.3V. The voltage dividing sub-circuit 330 is used to reduce the voltage transmitted to the same-phase input end of the voltage comparator 310, so as to determine the existence of the super capacitor with an initial voltage close to 0V in the test system through the input voltage (reference voltage) of the same-phase input end of the voltage comparator 310. In the embodiment, the voltage dividing sub-circuit 330 includes a first voltage dividing resistor 331 (i.e. R2 in the formula Figure 2 ) arranged on the connection line of the voltage comparator 310 and the power supply 320, and a second voltage dividing resistor 332 (i.e. R1 in the formula Figure 2The second voltage dividing resistor 332 is electrically connected with the non-inverting input terminal of the voltage comparator 310. Further, the resistance value of the first voltage dividing resistor 331 is 8kΩ-12kΩ, and the resistance value of the second voltage dividing resistor 332 is 100Ω-10kΩ. Preferably, the resistance value of the first voltage dividing resistor 331 is 10kΩ, and the resistance value of the second voltage dividing resistor 332 is 10kΩ.

[0018] In the embodiment, the reference voltage and the charging delay time can be selected by the following table:

[0019] t / T Capacitance voltage / Vcharge 0.1 0.095 0.2 0.181 0.3 0.259 0.4 0.330 0.5 0.393 0.6 0.451 0.7 0.503 0.8 0.551 0.9 0.593 1 0.632

[0020] wherein t is the delay time (unit: s), τ is the time constant (unit: s) of the super capacitor identification circuit, which is equal to the resistance value of the charging resistor 220 multiplied by the capacitance value of the to-be-tested super capacitor 10, t / τ is the ratio of the delay time to the time constant; the capacitor voltage is the voltage of the to-be-tested super capacitor 10, Vcharge is the charging voltage (i.e., the voltage of the charging power supply 210), and the capacitor voltage / Vcharge is the ratio of the voltage of the to-be-tested super capacitor 10 to the charging voltage. In this way, the reference voltage and the charging delay time can be determined according to the above table. For example, the capacitance value of the to-be-tested super capacitor 10 is 1F, the resistance value of the charging resistor 220 is 10Ω, and the voltage of the charging power supply 210 is 1V. Then, the time constant is 10s, and the reference voltage is 0.1V and the delay time is 1s can be selected by adjusting the resistance values of the first voltage dividing resistor 331 and the second voltage dividing resistor 332 according to the above table.

[0021] The super capacitor identification circuit of the embodiment can charge the to-be-tested super capacitor 10 through the charging circuit 200. The voltage of the super capacitor changes slowly during the charging process, and the initial voltage is close to 0V. The voltage comparator 310 is used for voltage comparison, and the super capacitor with an initial voltage close to 0V connected to the test system can be identified. That is, whether the super capacitor with an initial voltage close to 0V is correctly connected to the test station can be identified. The super capacitor identification circuit does not need to add an additional proximity sensor, reduces the cost of the test system, and does not require the super capacitor to be set in a specific position, which facilitates flexible setting of the test station. The identification result is not disturbed by the setting position of the super capacitor, and the reliability and accuracy of the identification result are improved, and the normal operation of the super capacitor test operation is ensured.

[0022] Any combination of the technical features of the above-described embodiments can be made. To make the description concise, all possible combinations of the technical features in the above-described embodiments are not described, but as long as the combination of the technical features does not exist, it should be considered as the scope of the description.

[0023] The above-described embodiments only express several implementation manners of the utility model, the description is more specific and detailed, but can not therefore be understood as the limitation of the utility model patent range. It should be pointed out that for ordinary skilled person in the art, without departing from the utility model concept, several modifications and improvements can be made, which belong to the protection range of the utility model. Therefore, the protection range of the utility model patent should be subject to the appended claims.

Claims

1. A supercapacitor identification circuit, characterized in that, The application relates to a super capacitor testing device, which comprises a switch circuit connected with a super capacitor to be tested, a charging circuit and a voltage comparison circuit, the switch circuit comprises a relay, the charging circuit comprises a charging power supply for providing a charging voltage, a charging resistor arranged on a connecting line of the charging power supply and the relay, the voltage comparison circuit comprises a voltage comparator and a power supply, the inverting input end of the voltage comparator is electrically connected with the relay, the non-inverting input end of the voltage comparator is electrically connected with the power supply, the output end of the voltage comparator is electrically connected with an external processing device or a display device, and a voltage dividing sub-circuit is arranged on the connecting line of the voltage comparator and the power supply.

2. The supercapacitor identification circuit of claim 1, wherein, The voltage dividing sub-circuit comprises a first voltage dividing resistor arranged on the connecting line of the voltage comparator and the power supply, and a second voltage dividing resistor connected with the first voltage dividing resistor in parallel and grounded, and the second voltage dividing resistor is electrically connected with the non-inverting input end of the voltage comparator.

3. The supercapacitor identification circuit of claim 2, wherein, The resistance value of the first voltage dividing resistor is 8kOmega-12kOmega, and the resistance value of the second voltage dividing resistor is 100Omega-10kOmega.

4. The supercapacitor identification circuit of claim 1, wherein, The resistance value of the charging resistor is 8-12Omega.

5. The supercapacitor identification circuit of claim 1, wherein, The voltage of the charging power supply is 1V.

6. The supercapacitive identification circuit of claim 1, wherein, The voltage of the power supply is 3.3V.

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