Testing equipment for testing on-off and direct-current internal resistance

Abstract

The utility model discloses a test device for testing on-off and DC internal resistance, which relates to the field of testing, and comprises a filtering and surge protection circuit used for introducing 7V voltage and outputting the 7V voltage to a voltage stabilization power supply circuit through a power switch circuit after filtering and surge protection; the power switch circuit is used for controlling on-off of a loop between the filtering and surge protection circuit and the voltage-stabilizing power supply circuit; the voltage stabilization power supply circuit is used for outputting 5V stable voltage and supplying the 5V stable voltage to the constant current output circuit, the test sampling amplification circuit, the logic judgment circuit, the display circuit and the alarm circuit; the constant current output circuit is used for outputting constant current to pass through the to-be-tested product and equipment; compared with the prior art, the utility model has the beneficial effects that the direct current internal resistance test precision is high and can reach milliohm level, and the quality of a product and equipment to be tested can be judged through the display circuit and the alarm circuit; multi-channel testing can be achieved, and the testing efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the field of testing, in particular to a testing device for testing continuity and DC internal resistance. Background Art

[0002] Existing DC internal resistance or continuity test equipment can only test one channel and the accuracy is not very high. When faced with mass-produced battery packs and other equipment, the current DC internal resistance or continuity test equipment has slow measurement speed and low accuracy, and needs to be improved. Utility Model Content

[0003] The purpose of the present invention is to provide a test device for testing continuity and DC internal resistance, so as to solve the problems raised in the above background technology.

[0004] To achieve the above objectives, the present invention provides the following technical solutions:

[0005] A test device for testing continuity and DC internal resistance, comprising:

[0006] The filtering and surge protection circuit is used to introduce 7V voltage, which is then output to the voltage-stabilized power supply circuit through the power switch circuit after filtering and surge protection;

[0007] The power switch circuit is used to control the on / off of the circuit between the filtering and surge protection circuit and the voltage-stabilized power supply circuit;

[0008] The voltage-stabilized power supply circuit is used to output a stable 5V voltage to supply the constant current output circuit, test sampling amplifier circuit, logic judgment circuit, display circuit, and alarm circuit;

[0009] Constant current output circuit, used to output constant current through the products and equipment to be tested;

[0010] The test sampling and amplifying circuit is used to sample the voltage on the product and equipment to be tested, and output the judgment voltage to the logic judgment circuit after amplification;

[0011] A logic judgment circuit is used to output different voltage signals based on the magnitude of the judgment voltage and the set voltage;

[0012] The display circuit is used to light up the red light when the voltage is judged to be greater than the set voltage; and light up the green light when the voltage is judged to be less than the set voltage;

[0013] Alarm circuit, used to sound a warning when the voltage is greater than the set voltage;

[0014] The filtering and surge protection circuit is connected to the power switch circuit, the power switch circuit is connected to the voltage-stabilized power supply circuit, the voltage-stabilized power supply circuit is connected to the constant current output circuit, the test sampling amplifier circuit, the logic judgment circuit, the display circuit, and the alarm circuit, the constant current output circuit is connected to the test sampling amplifier circuit, the test sampling amplifier circuit is connected to the logic judgment circuit, and the logic judgment circuit is connected to the display circuit and the alarm circuit.

[0015] As a further solution of the present utility model: the constant current output circuit includes a voltage regulator source U2, a resistor R14, a capacitor C11, an amplifier U3, a capacitor C6, a resistor R11, a resistor R5, a resistor R6, a MOS tube Q3, and an interface CON6. The model of the voltage regulator source U2 is AZ431AN. The first end of the voltage regulator source U2 is connected to the second end of the voltage regulator source U2, one end of the capacitor C11, and a 5V voltage. The third end of the voltage regulator source U2 is connected to one end of the resistor R14 and the non-inverting end of the amplifier U3. The other end of the resistor R14 is grounded. The other end of the capacitor C11 is grounded. The inverting end of the amplifier U3 is connected to one end of the resistor R6 and the S pole of the MOS tube Q3. The other end of the resistor R6 is connected to the 5V voltage through the resistor R5. The output end of the amplifier U3 is connected to the G pole of the MOS tube Q3 through the resistor R11. The D pole of the MOS tube Q3 is connected to the first end of the interface CON6. The second end of the interface CON6 is grounded. The interface CON6 is externally connected to test products and equipment.

[0016] As a further solution of the present invention: the test sampling amplification circuit includes an interface CON5 and an amplifier U4. The model of the amplifier U4 is AD623. The interface CON5 is connected to the constant current output circuit. The first end of the interface CON5 is connected to one end of the resistor R19, and the other end of the resistor R19 is connected to pin 2 of the amplifier U4. The second end of the interface CON5 is connected to one end of the resistor R7 and one end of the resistor R9. The other end of the resistor R7 is connected to a 5V voltage. The other end of the resistor R9 is connected to pin 3 of the amplifier U4. Pin 1 of the amplifier U4 is connected to pin 8 of the amplifier U4 through resistor R13. Pin 6 of the amplifier U4 is connected to the logic judgment circuit.

[0017] As a further solution of the present invention: the logic judgment circuit includes a voltage regulator U6 and an amplifier U5. The non-inverting end of the amplifier U5 is connected to the test sampling amplifier circuit, the inverting end of the amplifier U5 is connected to one end of the resistor R21 and one end of the resistor R22, the other end of the resistor R22 is grounded, the other end of the resistor R21 is connected to one end of the resistor R20, and the other end of the resistor R20 is connected to the first end and the second end of the voltage regulator U6 and one end of the resistor R18. The positive pole of the voltage regulator U6 is grounded, the other end of the resistor R18 is connected to a 5V voltage, and the output end of the amplifier U5 is connected to the display circuit.

[0018] As a further solution of the present utility model: the display circuit includes an interface CON3, an interface CON4, and a MOS transistor Q4. The G electrode of the MOS transistor Q4 is connected to the cathode of the diode D4, the anode of the diode D4 is connected to the logic judgment circuit and one end of the resistor R12, the other end of the resistor R12 is connected to the first end of the interface CON3, the S electrode of the MOS transistor Q4 is grounded, the D electrode of the MOS transistor Q4 is connected to the third end of the interface CON3 through the resistor R10, the second end of the interface CON3 is connected to a 5V voltage, the interface CON3 is connected to the interface CON4, the first end of the interface CON4 is connected to the first end of the dual-color lamp LED1, the second end of the interface CON4 is connected to the second end of the dual-color lamp LED1, and the third end of the interface CON4 is connected to the third end of the dual-color lamp LED1. The dual-color lamp is composed of a red light-emitting diode and a green light-emitting diode connected in parallel.

[0019] As a further solution of the present utility model: the alarm circuit includes a MOS tube Q5 and a buzzer B1. The G pole of the MOS tube Q5 is connected to the cathode of the diode D6 through the resistor R25, the anode of the diode D6 is connected to the logic judgment circuit, the S pole of the MOS tube Q5 is grounded, the D pole of the MOS tube Q5 is connected to one end of the buzzer B1, the other end of the buzzer B1 is connected to one end of the resistor R23, the other end of the resistor R23 is connected to the cathode of the diode D5, and the anode of the diode D5 is connected to a 5V voltage.

[0020] Compared with the existing technology, the beneficial effects of the present invention are: the DC test internal resistance of the present invention has high accuracy and can reach the milliohm level (the DC internal resistance of the milliohm level is adjustable from 10 to 1000 milliohms), and the quality of the products and equipment to be tested can be judged through the display circuit and the alarm circuit; multi-channel testing can be performed to improve test efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 The following is a circuit diagram of a test device for testing continuity and DC internal resistance. DETAILED DESCRIPTION

[0022] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0023] See also Figure 1 , a test device for testing continuity and DC internal resistance, comprising:

[0024] The filtering and surge protection circuit is used to introduce 7V voltage, which is then output to the voltage-stabilized power supply circuit through the power switch circuit after filtering and surge protection;

[0025] The power switch circuit is used to control the on / off of the circuit between the filtering and surge protection circuit and the voltage-stabilized power supply circuit;

[0026] The voltage-stabilized power supply circuit is used to output a stable 5V voltage to supply the constant current output circuit, test sampling amplifier circuit, logic judgment circuit, display circuit, and alarm circuit;

[0027] Constant current output circuit, used to output constant current through the products and equipment to be tested;

[0028] The test sampling and amplifying circuit is used to sample the voltage on the product and equipment to be tested, and output the judgment voltage to the logic judgment circuit after amplification;

[0029] A logic judgment circuit is used to output different voltage signals based on the magnitude of the judgment voltage and the set voltage;

[0030] The display circuit is used to light up the red light when the voltage is judged to be greater than the set voltage; and light up the green light when the voltage is judged to be less than the set voltage;

[0031] Alarm circuit, used to sound a warning when the voltage is greater than the set voltage;

[0032] The filtering and surge protection circuit is connected to the power switch circuit, the power switch circuit is connected to the voltage-stabilized power supply circuit, the voltage-stabilized power supply circuit is connected to the constant current output circuit, the test sampling amplifier circuit, the logic judgment circuit, the display circuit, and the alarm circuit, the constant current output circuit is connected to the test sampling amplifier circuit, the test sampling amplifier circuit is connected to the logic judgment circuit, and the logic judgment circuit is connected to the display circuit and the alarm circuit.

[0033] In the specific embodiment: see Figure 1 In the filtering and surge protection circuit, capacitor C5 filters the input voltage and diode D2 performs surge protection. When the input voltage is large enough to reach the conduction voltage of diode D2, diode D2 is turned on and grounded, discharging current for protection.

[0034] In the power switch circuit, the MOS tube Q1 is a PMOS tube. Initially, the resistor R1 makes the G pole of the MOS tube Q1 high, and the MOS tube Q1 is turned off. After the self-locking switch CON2 controls the MOS tube Q2 to be turned on, the G pole voltage of the MOS tube Q1 is lowered, and the MOS tube Q1 is turned on.

[0035] The voltage regulator U1 converts the input voltage into a 5V stable voltage output to power other circuits.

[0036] In this example: See Figure 1 The constant current output circuit includes a voltage regulator U2, a resistor R14, a capacitor C11, an amplifier U3, a capacitor C6, a resistor R11, a resistor R5, a resistor R6, a MOS tube Q3, and an interface CON6. The model of the voltage regulator U2 is AZ431AN. The first end of the voltage regulator U2 is connected to the second end of the voltage regulator U2, one end of the capacitor C11, and a 5V voltage. The third end of the voltage regulator U2 is connected to one end of the resistor R14 and the non-inverting end of the amplifier U3. The other end of the resistor R14 is grounded. The other end of the capacitor C11 is grounded. The inverting end of the amplifier U3 is connected to one end of the resistor R6 and the S pole of the MOS tube Q3. The other end of the resistor R6 is connected to the 5V voltage through the resistor R5. The output end of the amplifier U3 is connected to the G pole of the MOS tube Q3 through the resistor R11. The D pole of the MOS tube Q3 is connected to the first end of the interface CON6. The second end of the interface CON6 is grounded. The interface CON6 receives test products and equipment externally.

[0037] The positive voltage of the voltage regulator U2 is determined, and the voltage at the non-inverting terminal and the inverting terminal of the amplifier are the same. Therefore, the S-pole voltage of the MOS tube Q3 is determined. The resistance values ​​of the resistors R5 and R6 are determined, and therefore the current flowing through the resistors R5 and R6 is determined, obtaining a constant current output. After the MOS tube Q3 is turned on, the constant current flows through the product and equipment under test on the interface CON6. By sampling the voltage of the product and equipment under test, the internal resistance of the product and equipment under test can be determined.

[0038] In this example: See Figure 1 The test sampling amplifier circuit includes an interface CON5 and an amplifier U4. The model of the amplifier U4 is AD623. The interface CON5 is connected to the constant current output circuit. The first end of the interface CON5 is connected to one end of the resistor R19, and the other end of the resistor R19 is connected to pin 2 of the amplifier U4. The second end of the interface CON5 is connected to one end of the resistor R7 and one end of the resistor R9. The other end of the resistor R7 is connected to a 5V voltage. The other end of the resistor R9 is connected to pin 3 of the amplifier U4. Pin 1 of the amplifier U4 is connected to pin 8 of the amplifier U4 through a resistor R13. Pin 6 of the amplifier U4 is connected to the logic judgment circuit.

[0039] Interface CON5 and interface CON6 are connected to introduce the voltage on the product to be tested and the device. After amplification by amplifier U4, the amplified voltage is output, which is the judgment voltage.

[0040] In this example: See Figure 1The logic judgment circuit includes a voltage regulator U6 and an amplifier U5. The non-inverting end of the amplifier U5 is connected to the test sampling amplifier circuit, the inverting end of the amplifier U5 is connected to one end of the resistor R21 and one end of the resistor R22, the other end of the resistor R22 is grounded, the other end of the resistor R21 is connected to one end of the resistor R20, and the other end of the resistor R20 is connected to the first end and the second end of the voltage regulator U6 and one end of the resistor R18. The positive pole of the voltage regulator U6 is grounded, the other end of the resistor R18 is connected to a 5V voltage, and the output end of the amplifier U5 is connected to the display circuit.

[0041] The judgment voltage is input to the non-inverting terminal of amplifier U5. A set voltage is generated at the inverting terminal of amplifier U5. A 2.5V voltage is generated by voltage regulator U6 (model TL431). After voltage division by resistors R20, R21, and R22, the voltage across resistor R22 becomes the set voltage. By comparing the judgment voltage with the set voltage, the internal resistance of the product and device under test is determined to be acceptable. If the judgment voltage is greater than the set voltage, amplifier U5 outputs a high level; if the judgment voltage is less than the set voltage, amplifier U5 outputs a low level.

[0042] In this example: See Figure 1 The display circuit includes an interface CON3, an interface CON4, and a MOS transistor Q4. The G terminal of the MOS transistor Q4 is connected to the cathode of the diode D4, the anode of the diode D4 is connected to the logic judgment circuit and one end of the resistor R12, the other end of the resistor R12 is connected to the first end of the interface CON3, the S terminal of the MOS transistor Q4 is grounded, the D terminal of the MOS transistor Q4 is connected to the third end of the interface CON3 via the resistor R10, the second end of the interface CON3 is connected to a 5V voltage, the interface CON3 is connected to the interface CON4, the first end of the interface CON4 is connected to the first end of the dual-color lamp LED1, the second end of the interface CON4 is connected to the second end of the dual-color lamp LED1, and the third end of the interface CON4 is connected to the third end of the dual-color lamp LED1. The dual-color lamp is composed of a red diode and a green diode connected in parallel.

[0043] When the amplifier U5 outputs a high level, the first ends of the interfaces CON3 and CON4 are at a high level, the MOS tube Q4 is turned on, the third ends of the interfaces CON3 and CON4 are at a low level, and the second ends of the interfaces CON3 and CON4 are at a 5V voltage. Therefore, at this time, the second and third ends of the interface CON4 are turned on through the dual-color light LED1, emitting red light.

[0044] When the amplifier U5 outputs a low level, the first ends of the interfaces CON3 and CON4 are at a low level, the MOS tube Q4 is turned off, and the loop between the third ends of the interfaces CON3 and CON4 and the common ground GND (the grounding mentioned above is the connection to the common point GND) is disconnected. At this time, the second end and the first end of the interface CON4 are turned on through the dual-color light emitting lamp LED1, emitting green light.

[0045] In this example: See Figure 1 The alarm circuit includes a MOS transistor Q5 and a buzzer B1. The G terminal of the MOS transistor Q5 is connected to the cathode of the diode D6 through a resistor R25. The anode of the diode D6 is connected to the logic judgment circuit. The S terminal of the MOS transistor Q5 is grounded. The D terminal of the MOS transistor Q5 is connected to one end of the buzzer B1. The other end of the buzzer B1 is connected to one end of the resistor R23. The other end of the resistor R23 is connected to the cathode of the diode D5. The anode of the diode D5 is connected to a 5V voltage.

[0046] When the amplifier U5 outputs a high level, the MOS tube Q5 is turned on, and the 5V voltage, diode D5, resistor R23, buzzer B1, MOS tube Q5, and common ground GND form a loop, and the buzzer B1 beeps to give a prompt.

[0047] The working principle of the present utility model is as follows: the filtering and surge protection circuit is used to introduce a 7V voltage, which is output to the voltage-stabilized power supply circuit through the power switch circuit after filtering and surge protection; the power switch circuit is used to control the on-off of the loop between the filtering and surge protection circuit and the voltage-stabilized power supply circuit; the voltage-stabilized power supply circuit is used to output a 5V stable voltage to supply the constant current output circuit, the test sampling amplifier circuit, the logic judgment circuit, the display circuit, and the alarm circuit; the constant current output circuit is used to output a constant current through the product and equipment to be tested; the test sampling amplifier circuit is used to sample the voltage on the product and equipment to be tested, and output the judgment voltage to the logic judgment circuit after amplification; the logic judgment circuit is used to output different voltage signals based on the size of the judgment voltage and the set voltage; the display circuit is used to light up a red light when the judgment voltage is greater than the set voltage; and light up a green light when the judgment voltage is less than the set voltage; the alarm circuit is used to give a chime prompt when the judgment voltage is greater than the set voltage.

[0048] The utility model can test the internal resistance of DC with high precision up to milliohm level (the DC internal resistance of milliohm level is adjustable from 10 to 1000 milliohms). The quality of the tested products and equipment can be judged through the display circuit and the alarm circuit. It can also perform multi-channel testing to improve the test efficiency ( Figure 1 For single channel, just add corresponding circuits for multi-channel).

[0049] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered in all respects as exemplary and non-restrictive.

[0050] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A test device for testing continuity and DC internal resistance, characterized in that: The test equipment for testing continuity and DC internal resistance includes: The filtering and surge protection circuit is used to introduce 7V voltage, which is then output to the voltage-stabilized power supply circuit through the power switch circuit after filtering and surge protection; The power switch circuit is used to control the on / off of the circuit between the filtering and surge protection circuit and the voltage-stabilized power supply circuit; The voltage-stabilized power supply circuit is used to output a stable 5V voltage to supply the constant current output circuit, test sampling amplifier circuit, logic judgment circuit, display circuit, and alarm circuit; Constant current output circuit, used to output constant current through the products and equipment to be tested; The test sampling and amplifying circuit is used to sample the voltage on the product and equipment to be tested, and output the judgment voltage to the logic judgment circuit after amplification; A logic judgment circuit is used to output different voltage signals based on the magnitude of the judgment voltage and the set voltage; The display circuit is used to light up the red light when the voltage is judged to be greater than the set voltage; and light up the green light when the voltage is judged to be less than the set voltage; Alarm circuit, used to sound a warning when the voltage is greater than the set voltage; The filtering and surge protection circuit is connected to the power switch circuit, the power switch circuit is connected to the voltage-stabilized power supply circuit, the voltage-stabilized power supply circuit is connected to the constant current output circuit, the test sampling amplifier circuit, the logic judgment circuit, the display circuit, and the alarm circuit, the constant current output circuit is connected to the test sampling amplifier circuit, the test sampling amplifier circuit is connected to the logic judgment circuit, and the logic judgment circuit is connected to the display circuit and the alarm circuit.

2. The test equipment for testing continuity and DC internal resistance according to claim 1, characterized in that: The constant current output circuit includes a voltage regulator U2, a resistor R14, a capacitor C11, an amplifier U3, a capacitor C6, a resistor R11, a resistor R5, a resistor R6, a MOS tube Q3, and an interface CON6. The model of the voltage regulator U2 is AZ431AN. The first end of the voltage regulator U2 is connected to the second end of the voltage regulator U2, one end of the capacitor C11, and a 5V voltage. The third end of the voltage regulator U2 is connected to one end of the resistor R14 and the non-inverting end of the amplifier U3. The other end of the resistor R14 is grounded. The other end of the capacitor C11 is grounded. The inverting end of the amplifier U3 is connected to one end of the resistor R6 and the S pole of the MOS tube Q3. The other end of the resistor R6 is connected to the 5V voltage through the resistor R5. The output end of the amplifier U3 is connected to the G pole of the MOS tube Q3 through the resistor R11. The D pole of the MOS tube Q3 is connected to the first end of the interface CON6. The second end of the interface CON6 is grounded. The interface CON6 receives test products and equipment externally.

3. The test equipment for testing continuity and DC internal resistance according to claim 1, characterized in that: The test sampling amplifier circuit includes an interface CON5 and an amplifier U4. The model of the amplifier U4 is AD623. The interface CON5 is connected to the constant current output circuit. The first end of the interface CON5 is connected to one end of the resistor R19, and the other end of the resistor R19 is connected to pin 2 of the amplifier U4. The second end of the interface CON5 is connected to one end of the resistor R7 and one end of the resistor R9. The other end of the resistor R7 is connected to a 5V voltage. The other end of the resistor R9 is connected to pin 3 of the amplifier U4. Pin 1 of the amplifier U4 is connected to pin 8 of the amplifier U4 through resistor R13. Pin 6 of the amplifier U4 is connected to the logic judgment circuit.

4. The test equipment for testing continuity and DC internal resistance according to claim 3, characterized in that: The logic judgment circuit includes a voltage regulator U6 and an amplifier U5. The non-inverting end of the amplifier U5 is connected to the test sampling amplifier circuit, the inverting end of the amplifier U5 is connected to one end of the resistor R21 and one end of the resistor R22, the other end of the resistor R22 is grounded, the other end of the resistor R21 is connected to one end of the resistor R20, and the other end of the resistor R20 is connected to the first end and the second end of the voltage regulator U6 and one end of the resistor R18. The positive pole of the voltage regulator U6 is grounded, the other end of the resistor R18 is connected to a 5V voltage, and the output end of the amplifier U5 is connected to the display circuit.

5. The test equipment for testing continuity and DC internal resistance according to claim 1, characterized in that: The display circuit includes an interface CON3, an interface CON4, and a MOS transistor Q4. The G terminal of the MOS transistor Q4 is connected to the cathode of the diode D4, the anode of the diode D4 is connected to the logic judgment circuit and one end of the resistor R12, the other end of the resistor R12 is connected to the first end of the interface CON3, the S terminal of the MOS transistor Q4 is grounded, the D terminal of the MOS transistor Q4 is connected to the third end of the interface CON3 via the resistor R10, the second end of the interface CON3 is connected to a 5V voltage, the interface CON3 is connected to the interface CON4, the first end of the interface CON4 is connected to the first end of the dual-color light LED1, the second end of the interface CON4 is connected to the second end of the dual-color light LED1, and the third end of the interface CON4 is connected to the third end of the dual-color light LED1. The dual-color light LED is composed of a red diode and a green diode connected in parallel.

6. The test equipment for testing continuity and DC internal resistance according to claim 1, characterized in that: The alarm circuit includes a MOS tube Q5 and a buzzer B1. The G pole of the MOS tube Q5 is connected to the cathode of the diode D6 through the resistor R25. The anode of the diode D6 is connected to the logic judgment circuit. The S pole of the MOS tube Q5 is grounded. The D pole of the MOS tube Q5 is connected to one end of the buzzer B1. The other end of the buzzer B1 is connected to one end of the resistor R23. The other end of the resistor R23 is connected to the cathode of the diode D5. The anode of the diode D5 is connected to a 5V voltage.

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