A Circuit and Method for Rapidly Detecting the Static Current of a Main Control Board with Supercapacitors

Abstract

The present invention relates to the technical field of electrical equipment, and particularly relates to a circuit and method for quickly detecting the static current of a main control board containing a super capacitor. The circuit includes a control circuit, a sampling circuit, a constant current source circuit, and a switching circuit. The positive power supply terminal of the main control board serves as the Vtest terminal. The sampling circuit samples the voltage of the Vtest terminal. The output terminal of the constant current source circuit is connected to the Vtest terminal. The Vtest terminal is connected to the DC power supply Vcc through the switching circuit. The output terminal of the sampling circuit, the enable terminal of the constant current source circuit, and the control terminal of the switching circuit are all connected to the control circuit. The beneficial technical effects of the present invention include: a constant current source circuit is used to provide a current equivalent to the static power consumption of the main control board under normal conditions. By detecting the voltage change amplitude of the super capacitor, it is judged whether the static power consumption of the main control board is normal. There is no need to wait for the super capacitor to complete charging, which significantly improves the efficiency of detecting the static power consumption of the main control board.

Description

Technical Field

[0001] The present invention relates to the technical field of electrical equipment, and particularly relates to a circuit and method for quickly detecting the static current of a main control board containing a super capacitor. Background Art

[0002] After the production of the main control board is completed, it is necessary to measure the static power consumption of the main control board to determine whether the main control board is operating normally. When there is a super capacitor in the power supply circuit of the main control board, the charging current of the super capacitor is in the mA level and the charging time is long. At this time, if the static power consumption of the main control board is in the μA level, it is difficult to measure the static power consumption of the main control board. The main methods currently used in production are as follows: (1) Waiting for the super capacitor to complete charging. This method wastes a lot of time and reduces production efficiency; (2) Welding the super capacitor after the power consumption test of the main control board is completed. This method brings the risk of manual welding, adds a process, and wastes time; (3) Separating the super capacitor from the main control board, leaving a socket for connecting the super capacitor on the main control board, connecting the super capacitor to the plug, and inserting the super capacitor after the power consumption detection is completed. This method increases the interface of the main control board, has high requirements for the structure, and increases the material cost. In summary, the existing methods all test the static power consumption of the main control board by changing the structure or process, and all have the problem of time consumption. Therefore, it is still necessary to study a solution for judging whether the static power consumption when the super capacitor is on the board is normal. Summary of the Invention

[0003] The technical problem to be solved by the present invention: The technical problem of low efficiency in currently judging the static power consumption of a main control board containing a super capacitor. A circuit and method for quickly detecting the static current of a main control board containing a super capacitor are proposed, which can improve the detection efficiency of whether the static power consumption of a main control board containing a super capacitor is normal.

[0004] To solve the above technical problems, the present invention adopts the following technical solutions: A circuit for quickly detecting the static current of a main control board containing a super capacitor, including a control circuit, a sampling circuit, a constant current source circuit, and a switching circuit. The positive power supply terminal of the main control board is used as the Vtest terminal. The sampling circuit samples the voltage of the Vtest terminal. The output terminal of the constant current source circuit is connected to the Vtest terminal. The Vtest terminal is connected to the DC power supply Vcc through the switching circuit. The output terminal of the sampling circuit, the enable terminal of the constant current source circuit, and the control terminal of the switching circuit are all connected to the control circuit.

[0005] Preferably, the constant current source circuit includes a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R6, a resistor R7, a resistor R8, a resistor R9, an operational amplifier U1, an operational amplifier U2, a switch U3, a triode Q5, and a MOS transistor Q1. The DC power supply Vcc is connected to the VIN+ terminal of the operational amplifier U1 after being divided by the resistors R1 and R2. The VDD terminals of the operational amplifier U1 and the operational amplifier U2 are both connected to the DC power supply Vcc. The VOUT terminal of the operational amplifier U1 is connected to the base of the triode Q5. The emitter of the triode Q5 is grounded through the resistor R4. The VIN- terminal of the operational amplifier U1 is connected to the emitter of the triode Q5 through the resistor R3. The collector of the triode Q5 is connected to the DC power supply Vcc through the resistor R6. The collector of the triode Q5 is connected to the VIN+ terminal of the operational amplifier U2. The VOUT terminal of the operational amplifier U2 is connected to the gate of the MOS transistor Q1. The source of the MOS transistor Q1 is connected to the DC power supply Vcc through the resistor R8. The VIN- terminal of the operational amplifier U2 is connected to the source of the MOS transistor Q1 through the resistor R7. The drain of the MOS transistor Q1 is connected to the NO terminal of the switch U3. The IN terminal of the switch U3 is connected to the control circuit. The COM terminal of the switch U3 is connected to the Vtest terminal.

[0006] Preferably, the sampling circuit includes a resistor R10, a resistor R11, a resistor R12, a resistor R13, a capacitor C1, a capacitor C2, a capacitor C13, and an AD sampling chip U4. The Vtest terminal is connected to the AINP terminal of the AD sampling chip U4 through the resistors R10 and R11. The AINP terminal of the AD sampling chip U4 is grounded through the capacitor C2. The REFIN terminal of the AD sampling chip U4 is grounded through the capacitor C1. The GND terminal and the AINN terminal of the AD sampling chip U4 are both grounded. The REFOUT terminal of the AD sampling chip U4 is connected to the REFIN terminal. The VDD terminal of the AD sampling chip U4 is grounded through the capacitor C13. The VDD terminal of the AD sampling chip U4 is connected to the DC power supply Vcc. The DRDY#DOUT terminal of the AD sampling chip U4 outputs a detection signal DOUT to the control circuit through the resistor R12. The clock signal SCLK terminal of the control circuit is connected to the SCLK terminal of the AD sampling chip U4 through the resistor R13.

[0007] Preferably, the switch circuit includes a resistor R17, a resistor R18, a resistor R19, a resistor R27, a MOS transistor Q2, a MOS transistor Q3, and a triode Q13. The source of the MOS transistor Q2 is connected to the Vtest terminal. The drain of the MOS transistor Q2 is connected to the drain of the MOS transistor Q3. The source of the MOS transistor Q3 is connected to the DC power supply Vcc. The gates of the MOS transistor Q2 and the MOS transistor Q3 are both connected to the collector of the triode Q13 through the resistor R18. The DC power supply Vcc is connected to the collector of the triode Q13 through the resistor R17 and the resistor R18. The emitter of the triode Q13 is grounded. The base of the triode Q13 is grounded through the resistor R27. The base of the triode Q13 is connected to the out-enA signal terminal of the control circuit through the resistor R19.

[0008] A method for quickly testing the static current of a main control board with a super capacitor uses a circuit for quickly testing the static current of a main control board as described above, and includes the following steps:

[0009] Obtain the static power consumption of the main control board, and adjust the constant current source circuit so that the constant current is consistent with the static power consumption of the main control board;

[0010] The control circuit turns off the enable terminal of the constant current source circuit and turns on the switch circuit so that the DC power supply Vcc directly supplies power to the main control board. At this time, the super capacitor is in a charging state;

[0011] Periodically collect the voltage at the Vtest terminal detected by the sampling circuit. When the voltage at the Vtest terminal reaches a preset voltage value, the control circuit controls the switch circuit to disconnect;

[0012] The control circuit turns on the enable terminal of the constant current source circuit;

[0013] Wait for a preset time period and then read the voltage at the Vtest terminal collected by the sampling circuit. If the change in the voltage at the Vtest terminal is less than a preset threshold, it is determined that the static current of the main control board is normal. Otherwise, if the change in the voltage at the Vtest terminal is not less than the preset threshold, it is determined that the static current of the main control board is abnormal.

[0014] Preferably, the method for adjusting the constant current source circuit so that the constant current is consistent with the static power consumption of the main control board is as follows: adjust the value of the constant current output by the constant current source circuit so that the difference between the product of the constant current value and the supply voltage and the static power consumption of the main control board is less than a preset threshold, that is, it is determined that the constant current is consistent with the static power consumption of the main control board.

[0015] Preferably, the preset voltage value is lower than the voltage of the DC power supply Vcc and higher than the minimum operating voltage of the main control board.

[0016] Preferably, the method for quickly testing the static current of a main control board with a super capacitor further includes the steps of:

[0017] According to the change value of the voltage at the Vtest terminal and the supercapacitor discharge curve, calculate the discharge charge of the supercapacitor. Divide the intervals and abnormal levels according to the preset discharge charge of the supercapacitor to obtain the abnormal level of the static current of the main control board.

[0018] The beneficial technical effects of the present invention include: using a constant current source circuit to provide a current equivalent to the static power consumption of the main control board under normal conditions, and judging whether the static power consumption of the main control board is normal by detecting the voltage change amplitude of the supercapacitor. It is not necessary to wait for the supercapacitor to complete charging, which significantly improves the efficiency of the static power consumption inspection of the main control board.

[0019] Other features and advantages of the present invention will be disclosed in detail in the following specific embodiments and drawings. Brief Description of the Drawings

[0020] The following further describes the present invention with reference to the accompanying drawings:

[0021] Figure 1 It is the circuit schematic diagram for quickly inspecting the static current of the main control board with a supercapacitor in an embodiment of the present invention.

[0022] Figure 2 It is the circuit schematic diagram of the switch circuit in an embodiment of the present invention.

[0023] Figure 3 It is the circuit schematic diagram of the sampling circuit in an embodiment of the present invention.

[0024] Figure 4 It is the circuit schematic diagram of the constant current source circuit in an embodiment of the present invention.

[0025] Figure 5 It is the schematic flow chart of the method for quickly inspecting the static current of the main control board with a supercapacitor in an embodiment of the present invention.

[0026] Figure 6 It is the schematic diagram of the relationship between the voltage and charge of the supercapacitor in an embodiment of the present invention.

[0027] Among them: 10. Control circuit, 20. Sampling circuit, 30. Constant current source circuit, 40. Switch circuit, 50. Vtest terminal. Detailed Description of the Embodiments

[0028] The following explains and illustrates the technical solutions of the embodiments of the present invention with reference to the accompanying drawings of the embodiments of the present invention. However, the following embodiments are only the preferred embodiments of the present invention and not all of them. Based on the embodiments in the embodiments, other embodiments obtained by those skilled in the art without creative efforts all belong to the protection scope of the present invention.

[0029] In the following description, terms such as "inner", "outer", "upper", "lower", "left", "right", etc. indicating orientation or positional relationship are only for convenience in describing embodiments and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention.

[0030] A circuit for quickly testing the static current of a main control board with a super capacitor. Please refer to the appendix Figure 1 , which includes a control circuit 10, a sampling circuit 20, a constant current source circuit 30, and a switching circuit 40. The positive power supply terminal of the main control board serves as the Vtest terminal 50. The sampling circuit 20 samples the voltage of the Vtest terminal 50. The output terminal of the constant current source circuit 30 is connected to the Vtest terminal 50. The Vtest terminal 50 is connected to the DC power supply Vcc through the switching circuit 40. The output terminal of the sampling circuit 20, the enable terminal of the constant current source circuit 30, and the control terminal of the switching circuit 40 are all connected to the control circuit 10.

[0031] Please refer to the appendix Figure 2 , the switching circuit 40 includes a resistor R17, a resistor R18, a resistor R19, a resistor R27, an MOS transistor Q2, an MOS transistor Q3, and a triode Q13. The source electrode of the MOS transistor Q2 is connected to the Vtest terminal 50. The drain electrode of the MOS transistor Q2 is connected to the drain electrode of the MOS transistor Q3. The source electrode of the MOS transistor Q3 is connected to the DC power supply Vcc. The gates of the MOS transistor Q2 and the MOS transistor Q3 are both connected to the collector of the triode Q13 through the resistor R18. The DC power supply Vcc is connected to the collector of the triode Q13 through the resistor R17 and the resistor R18. The emitter of the triode Q13 is grounded. The base of the triode Q13 is grounded through the resistor R27. The base of the triode Q13 is connected to the out-enA signal terminal of the control circuit 10 through the resistor R19.

[0032] Please refer to the appendix Figure 3, the sampling circuit 20 includes a resistor R10, a resistor R11, a resistor R12, a resistor R13, a capacitor C1, a capacitor C2, a capacitor C13, and an AD sampling chip U4. The Vtest terminal 50 is connected to the AINP terminal of the AD sampling chip U4 through the resistor R10 and the resistor R11. The AINP terminal of the AD sampling chip U4 is grounded through the capacitor C2. The REFIN terminal of the AD sampling chip U4 is grounded through the capacitor C1. The GND terminal and the AINN terminal of the AD sampling chip U4 are both grounded. The REFOUT terminal of the AD sampling chip U4 is connected to the REFIN terminal. The VDD terminal of the AD sampling chip U4 is grounded through the capacitor C13. The VDD terminal of the AD sampling chip U4 is connected to the DC power supply Vcc. The DRDY#DOUT terminal of the AD sampling chip U4 outputs a detection signal DOUT to the control circuit 10 through the resistor R12. The clock signal SCLK terminal of the control circuit 10 is connected to the SCLK terminal of the AD sampling chip U4 through the resistor R13. The AD sampling chip U4 is used to sample the voltage of the main control board, and the voltage of the main control board is led out from the Vtest terminal 50.

[0033] Please refer to the appendix Figure 4 , the constant current source circuit 30 includes a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R6, a resistor R7, a resistor R8, a resistor R9, an operational amplifier U1, an operational amplifier U2, a switch U3, a triode Q5, and a MOS transistor Q1. The DC power supply Vcc is connected to the VIN+ terminal of the operational amplifier U1 after being divided by the resistors R1 and R2. The VDD terminals of the operational amplifier U1 and the operational amplifier U2 are both connected to the DC power supply Vcc. The VOUT terminal of the operational amplifier U1 is connected to the base of the triode Q5. The emitter of the triode Q5 is grounded through the resistor R4. The VIN- terminal of the operational amplifier U1 is connected to the emitter of the triode Q5 through the resistor R3. The collector of the triode Q5 is connected to the DC power supply Vcc through the resistor R6. The collector of the triode Q5 is connected to the VIN+ terminal of the operational amplifier U2. The VOUT terminal of the operational amplifier U2 is connected to the gate of the MOS transistor Q1. The source of the MOS transistor Q1 is connected to the DC power supply Vcc through the resistor R8. The VIN- terminal of the operational amplifier U2 is connected to the source of the MOS transistor Q1 through the resistor R7. The drain of the MOS transistor Q1 is connected to the NO terminal of the switch U3. The IN terminal of the switch U3 is connected to the control circuit 10. The COM terminal of the switch U3 is connected to the Vtest terminal 50.

[0034] In this embodiment, the power supply voltage of the main control board is 5V, and the constant current source circuit 30 uses an operational amplifier constant current source circuit 30 to output constant current. After the 5V DC voltage input is divided by the resistor R1 and the resistor R2, a 2V voltage is output to the VIN+ pin of the operational amplifier U1. The operational amplifier U1 outputs a high level to the base of the triode Q5, and the collector and emitter of the triode Q5 are turned on, and input to the VIN- pin of the operational amplifier U1 through the resistor R3 for negative feedback. The voltage at the VOUT terminal of the operational amplifier U1 will continuously rise to the input voltage, thus forming a virtual short. At this time, the output voltage is stabilized at 2V, so the voltage across the resistor R4 is 2V. Set the resistance value of the resistor R4 so that the current through the resistor R4 is 20uA. According to the emitter follower phenomenon of the triode, the current through the resistor R6 is also 20uA at this time. Select the resistance value of the resistor R6 so that the voltage drop across the resistor R6 is 0.2V, then a 4.8V voltage is input to the VIN+ pin of the operational amplifier U2. Similarly, for the above negative feedback and virtual short, the source and gate voltages of the MOS transistor Q1 are 4.8V. At this time, the voltage across the resistor R8 is 0.2V, and the current through the resistor R8 is 20uA. This circuit can control the magnitude of the current output by the constant current source circuit 30 by controlling the resistance values of the resistor R4, the resistor R6, and the resistor R8.

[0035] When using the circuit for quickly testing the static current of the main control board with a super capacitor provided in this embodiment, the testing process is as follows: Before the test starts, determine the static power consumption of the main control board to be tested, and the static power consumption of the main control board is provided by the manufacturer or the designer. Adjust the output current of the constant current source so that the product of the constant current and the voltage is consistent with the static power consumption of the main control board, such as being equal or differing by less than a threshold.

[0036] First, control the out-enB terminal of the control circuit 10 to output a low level to turn off the switch U3, so that the constant current source circuit 30 is disconnected from the main control board. Pull up the out-enA terminal of the control circuit 10 to turn on the triode Q13, and then turn on the MOS transistors Q2 and Q3. The DC power supply Vcc supplies 5V power to the main control board. At this time, the super capacitor is charging, and the voltage of the main control board rises from 0. The sampling chip U4 continuously samples the voltage of the main control board through the Vtest terminal 50. When the voltage of the main control board rises to about 4V, pull down the out-enA terminal of the control circuit 10 to turn off the triode Q13, turn off the MOS transistors Q2 and Q3, and at the same time pull up the out-enB terminal to connect the constant current source circuit 30 to the main control board. At this time, the input current of the entire circuit board is the current given by the constant current source circuit 30, and the consumed current is the static power consumption current. If the actual static power consumption current is close to the input current of the constant current source circuit 30, according to the super capacitor charging voltage curve, such as Figure 6As shown, it can be seen that at this time, the voltage of the super capacitor will remain unchanged or change slightly. If the static power consumption is too large, the power of the super capacitor will decrease significantly. If the static power consumption is too small, the power of the super capacitor will increase significantly. The voltage of the super capacitor can be collected through the Vtest terminal 50. If the voltage change range of the super capacitor is within the preset amplitude threshold, it is determined that the static power consumption of the main control board is normal; otherwise, it is determined that the static power consumption of the main control board is abnormal.

[0037] A method for quickly detecting the static current of a main control board with a super capacitor, using a circuit for quickly detecting the static current of a main control board with a super capacitor as described above. Please refer to the appendix Figure 5 , including the following steps:

[0038] Step A01) Obtain the static power consumption of the main control board, and adjust the constant current source circuit 30 so that the constant current is consistent with the static power consumption of the main control board;

[0039] Step A02) The control circuit 10 closes the enable terminal of the constant current source circuit 30 and turns on the switch circuit 40 to directly supply power to the main control board by the DC power supply Vcc. At this time, the super capacitor is in a charging state;

[0040] Step A03) Periodically collect the voltage of the Vtest terminal 50 detected by the sampling circuit 20. When the voltage of the Vtest terminal 50 reaches the preset voltage value, the control circuit 10 controls the switch circuit 40 to disconnect;

[0041] Step A04) The control circuit 10 turns on the enable terminal of the constant current source circuit 30;

[0042] Step A05) Wait for the preset duration and then read the voltage of the Vtest terminal 50 collected by the sampling circuit 20. If the voltage change of the Vtest terminal 50 is less than the preset threshold, it is determined that the static current of the main control board is normal; otherwise, if the voltage change of the Vtest terminal 50 is not less than the preset threshold, it is determined that the static current of the main control board is abnormal.

[0043] The method for adjusting the constant current source circuit 30 so that the constant current is consistent with the static power consumption of the main control board is as follows: Adjust the constant current value output by the constant current source circuit 30 so that the difference between the product of the constant current value and the supply voltage and the static power consumption of the main control board is less than the preset threshold, that is, it is determined that the constant current is consistent with the static power consumption of the main control board.

[0044] The preset voltage value is lower than the voltage of the DC power supply Vcc and higher than the minimum operating voltage of the main control board. In this embodiment, the main control board is powered by 5V, and the preset voltage can be set to 4V ± 0.5V.

[0045] The method for quickly detecting the static current of a main control board with a super capacitor further includes the step:

[0046] According to the voltage change value of the Vtest terminal 50 and the supercapacitor discharge curve, calculate the supercapacitor discharge charge amount. Divide the intervals and abnormal levels according to the preset supercapacitor discharge charge amount to obtain the abnormal level of the main control board static current.

[0047] The beneficial technical effects of this embodiment include: using the constant current source circuit 30 to provide a current equivalent to the static power consumption of the main control board under normal conditions, and judging whether the static power consumption of the main control board is normal by detecting the voltage change amplitude of the supercapacitor. There is no need to wait for the supercapacitor to complete charging, which significantly improves the efficiency of the static power consumption inspection of the main control board.

[0048] The above is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that the present invention includes but is not limited to the content described in the drawings and the above specific implementation manner. Any modification that does not deviate from the functional and structural principles of the present invention will be included in the scope of the claims.

Claims

1. A circuit for quickly detecting the static current of a main control board with a super capacitor, characterized in that it includes a control circuit, a sampling circuit, a constant current source circuit and a switching circuit. The positive power supply terminal of the main control board is used as the Vtest terminal. The sampling circuit samples the voltage of the Vtest terminal. The output terminal of the constant current source circuit is connected to the Vtest terminal. The Vtest terminal is connected to the DC power supply Vcc through the switching circuit. The output terminal of the sampling circuit, the enable terminal of the constant current source circuit and the control terminal of the switching circuit are all connected to the control circuit; The circuit is controlled by the following method steps: Obtain the static power consumption of the main control board, and adjust the constant current source circuit so that the constant current is consistent with the static power consumption of the main control board; The control circuit closes the enable terminal of the constant current source circuit and turns on the switching circuit so that the DC power supply Vcc directly supplies power to the main control board. At this time, the super capacitor is in a charging state; Periodically collect the voltage of the Vtest terminal detected by the sampling circuit. When the voltage of the Vtest terminal reaches the preset voltage value, the control circuit controls the switching circuit to disconnect; The control circuit turns on the enable terminal of the constant current source circuit; After waiting for the preset time, read the voltage of the Vtest terminal collected by the sampling circuit. If the change in the voltage of the Vtest terminal is less than the preset threshold, it is determined that the static current of the main control board is normal. Otherwise, if the change in the voltage of the Vtest terminal is not less than the preset threshold, it is determined that the static current of the main control board is abnormal.

2. The circuit for quickly detecting the static current of a main control board with a super capacitor according to claim 1, characterized in that the constant current source circuit includes resistors R1, R2, R3, R4, R6, R7, R8, R9, operational amplifier U1, operational amplifier U2, switch U3, triode Q5 and MOS transistor Q1. The DC power supply Vcc is connected to the VIN+ terminal of the operational amplifier U1 after being divided by the resistors R1 and R2. The VDD terminals of the operational amplifier U1 and the operational amplifier U2 are both connected to the DC power supply Vcc. The VOUT terminal of the operational amplifier U1 is connected to the base of the triode Q5. The emitter of the triode Q5 is grounded through the resistor R4. The VIN- terminal of the operational amplifier U1 is connected to the emitter of the triode Q5 through the resistor R3. The collector of the triode Q5 is connected to the DC power supply Vcc through the resistor R6. The collector of the triode Q5 is connected to the VIN+ terminal of the operational amplifier U2. The VOUT terminal of the operational amplifier U2 is connected to the gate of the MOS transistor Q1. The source of the MOS transistor Q1 is connected to the DC power supply Vcc through the resistor R8. The VIN- terminal of the operational amplifier U2 is connected to the source of the MOS transistor Q1 through the resistor R7. The drain of the MOS transistor Q1 is connected to the NO terminal of the switch U3. The IN terminal of the switch U3 is connected to the control circuit. The COM terminal of the switch U3 is connected to the Vtest terminal.

3. The circuit for quickly detecting the static current of a main control board with a super capacitor according to claim 1, characterized in that The sampling circuit includes resistor R10, resistor R11, resistor R12, resistor R13, capacitor C1, capacitor C2, capacitor C13 and AD sampling chip U4. The Vtest terminal is connected to the AINP terminal of the AD sampling chip U4 through resistor R10 and resistor R11. The AINP terminal of the AD sampling chip U4 is grounded through capacitor C2. The REFIN terminal of the AD sampling chip U4 is grounded through capacitor C1. The GND terminal and AINN terminal of the AD sampling chip U4 are both grounded. The REFOUT terminal of the AD sampling chip U4 is connected to the REFIN terminal. The VDD terminal of the AD sampling chip U4 is grounded through capacitor C13. The VDD terminal of the AD sampling chip U4 is connected to the DC power supply Vcc. The DRDY#DOUT terminal of the AD sampling chip U4 outputs the detection signal DOUT to the control circuit through resistor R12. The clock signal SCLK terminal of the control circuit is connected to the SCLK terminal of the AD sampling chip U4 through resistor R13.

4. The circuit for quickly detecting the static current of a main control board with a super capacitor according to claim 1, characterized in that The switching circuit includes resistor R17, resistor R18, resistor R19, resistor R27, MOS transistor Q2, MOS transistor Q3 and triode Q13. The source electrode of MOS transistor Q2 is connected to the Vtest terminal. The drain electrode of MOS transistor Q2 is connected to the drain electrode of MOS transistor Q3. The source electrode of MOS transistor Q3 is connected to the DC power supply Vcc. The gate electrodes of MOS transistor Q2 and MOS transistor Q3 are both connected to the collector of triode Q13 through resistor R18. The DC power supply Vcc is connected to the collector of triode Q13 through resistor R17 and resistor R18. The emitter of triode Q13 is grounded. The base of triode Q13 is grounded through resistor R27. The base of triode Q13 is connected to the out-enA signal terminal of the control circuit through resistor R19.

5. The circuit for quickly detecting the static current of a main control board with a super capacitor according to claim 1, characterized in that The method for adjusting the constant current source circuit to make the constant current match the static power consumption of the main control board is as follows: adjust the value of the constant current output by the constant current source circuit so that the difference between the product of the constant current value and the supply voltage and the static power consumption of the main control board is less than a preset threshold, that is, it is determined that the constant current matches the static power consumption of the main control board.

6. The circuit for quickly detecting the static current of a main control board with a super capacitor according to claim 1, characterized in that The preset voltage value is lower than the voltage of the DC power supply Vcc and higher than the minimum operating voltage of the main control board.

7. The circuit for quickly detecting the static current of a main control board with a super capacitor according to claim 1, characterized in that The method for quickly detecting the static current of a main control board with a super capacitor further includes the steps of Calculating the discharge charge of the super capacitor according to the voltage change value at the Vtest terminal and the discharge curve of the super capacitor, and obtaining the abnormal level of the static current of the main control board according to the preset intervals and abnormal levels of the discharge charge of the super capacitor.

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