A power supply protection device for lithium battery test

Abstract

The application provides a power supply protection device for lithium battery test in the technical field of lithium battery test equipment protection, which comprises a single-chip microcomputer U3, a rear power supply switch module, a rear power supply level conversion module, a front power supply module and a power supply state prompting module; the rear power supply switch module is connected with the single-chip microcomputer U3, the rear power supply level conversion module, the front power supply module and the power supply state prompting module respectively; and the rear power supply level conversion module is connected with the single-chip microcomputer U3. The application has the advantage that the stability of the power supply test equipment operation is greatly improved.

Description

Technical Field

[0001] This invention relates to the field of lithium battery testing equipment protection technology, and in particular to a power supply protection device for lithium battery testing. Background Technology

[0002] With the rapid development of lithium battery technology, the demand for stability of lithium battery testing equipment under different conditions and environments is also rapidly moving towards higher requirements and standards. In order to adapt to the rapid development of lithium battery technology, the functions of lithium battery testing equipment are constantly being added and updated. Correspondingly, the overall design complexity and precision of lithium battery testing equipment are also increasing.

[0003] To ensure stable operation of lithium battery testing equipment under various operating conditions, it is crucial to guarantee the stability of the power supply during the initial power-on process. This ensures that the equipment is not affected by switching before the entire system initialization is complete. This is because the chips at critical locations within the lithium battery testing equipment's circuitry have stringent requirements for power-on timing. If, during power-on, the entire system has not yet reached the initialization state and experiences fluctuating power-on and power-off cycles, or if the system is accidentally switched off and on again before stabilization due to accidental power switch activation, the power-on timing of each chip will be disrupted. This will also cause power surges to the internal circuitry of the lithium battery testing equipment, potentially damaging the internal chips and compromising their stability. Worse still, it could lead to complete damage to the internal circuitry itself due to power surges.

[0004] However, traditional lithium battery testing equipment simply adds a mechanical switch for power switching, resulting in a lack of power continuity during the power-on process. That is, during the power-on process of lithium battery testing equipment, the power supply is easily affected by the mechanical vibration generated during the switching process of the mechanical switch, and is easily affected by the power surge caused by accidental power switch switching, thus affecting the stability of the power testing equipment.

[0005] Therefore, how to provide a power supply protection device for lithium battery testing to improve the stability of power supply testing equipment has become an urgent technical problem to be solved. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide a power supply protection device for lithium battery testing, thereby improving the stability of power supply testing equipment operation.

[0007] The present invention is implemented as follows: a power supply protection device for lithium battery testing, comprising a microcontroller U3, a downstream power supply switch module, a downstream power level conversion module, a upstream power supply module, and a power supply status indication module.

[0008] The rear power supply switch module is connected with the single-chip microcomputer U3, the rear power supply level conversion module, the front power supply module and the power supply state prompting module respectively; the rear power supply level conversion module is connected with the single-chip microcomputer U3.

[0009] Further, the rear power supply switch module comprises a switch protection device U4, a D-type flip-flop U5, an optical coupler U6, an optical coupler U13, a MOS tube Q2, a MOS tube Q3, a MOS tube Q6, a reset button K1, a resistor R50, a resistor R58, a resistor R67, a resistor R68, a resistor R96, a resistor R97, a resistor R110, a capacitor C15, a capacitor C16, a diode D7 and a diode D12.

[0010] The pin 2 of the switch protection device U4 is connected with the reset button K1, the pin 3 is connected with the pin 2 of the D-type flip-flop U5, and the pin 4 is connected with the front power supply module; one end of the resistor R50 is connected with the front power supply module, and the other end is connected with the pin 1 of the D-type flip-flop U5, the drain of the MOS tube Q2 and the power supply state prompting module; the pin 4 of the D-type flip-flop U5 is connected with the resistor R68, and the pin 5 is connected with the front power supply module.

[0011] The gate of the MOS tube Q2 is connected with the resistor R58 and the capacitor C15, and the source is connected with the capacitor C15; the gate of the MOS tube Q3 is connected with the resistor R58, the resistor R68 and the capacitor C16, the source is connected with the capacitor C16, and the drain is connected with the power supply state prompting module and the rear power supply level conversion module.

[0012] The C pole of the optical coupler U13 is connected with the reset button K1, the E pole and the K pole are both connected with the input end of the diode D12 and the E pole of the optical coupler U6, and the A pole is connected with the resistor R67, the output end of the diode D12 and the C pole of the optical coupler U6; the resistor R67 is connected with the front power supply module; the A pole of the optical coupler U6 is connected with the resistor R96 and the output end of the diode D7, the K pole is connected with the input end of the diode D7 and the drain of the MOS tube Q6; the resistor R96 is connected with the rear power supply level conversion module.

[0013] The drain of the MOS tube Q6 is connected with the resistor R110, the gate is connected with the resistor R97, the resistor R110 and the pin 50 of the single-chip microcomputer U3; the resistor R97 is connected with the rear power supply level conversion module.

[0014] Further, the post-stage power supply level conversion module comprises a DCDC chip U1, an LDO linear voltage stabilizer U2, an LDO linear voltage stabilizer U7, an LDO linear voltage stabilizer U8, an LDO linear voltage stabilizer U9, an LDO linear voltage stabilizer U10, a transformer L3, a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C4, a capacitor C5, a capacitor C6, a capacitor C7, a capacitor C8, a capacitor C9, a capacitor C10, a capacitor C18, a capacitor C24, a capacitor C25, a capacitor C26, a capacitor C27, a capacitor C28, a capacitor C29, a capacitor C30, a capacitor C31, a capacitor C32, a capacitor C33, a capacitor C34, a capacitor C35, a capacitor C36, a capacitor C37, a capacitor C38, a capacitor C39, a capacitor C40, a capacitor C41, a capacitor C42, a capacitor C43, a capacitor C44, an inductor L1, an inductor L2, an inductor L4, an inductor L5, an inductor L6, an inductor L7, an inductor L10, a diode D1, a resistor R1, a resistor R3, a resistor R99, a resistor R100, a resistor R103, a resistor R104 and a resistor R106.

[0015] The capacitor C2 and the capacitor C3 are connected in parallel, one end of which is connected with the pin 1 of the transformer L3, and the other end of which is connected with the pin 4 of the transformer L3 and the post-stage power supply switch module; the capacitor C4 and the capacitor C5 are connected in parallel, one end of which is connected with the pin 2 of the transformer L3 and the pin 1 of the DCDC chip U1, and the other end of which is connected with the pin 3 of the transformer L3 and the pin 2 of the DCDC chip U1; the pin 5 of the DCDC chip U1 is connected with the capacitor C24, the resistor R1 and the inductor L7, the pin 6 is connected with the capacitor C1 and the capacitor C24 and grounded, and the pin 7 is connected with the capacitor C1, the inductor L2, the inductor L4, the inductor L5 and the inductor L6; the input end of the diode D1 is connected with the inductor L2, the inductor L10 and the post-stage power supply switch module, and the output end is connected with the resistor R1.

[0016] The capacitor C6 and the capacitor C7 are connected in parallel, one end of which is connected with the resistor R3 and the pins 5, 7 and 8 of the LDO linear voltage stabilizer U2, and the other end of which is grounded; the resistor R3 is connected with the inductor L10; one end of the capacitor C18 is connected with the pin 6 of the LDO linear voltage stabilizer U2, and the other end is grounded; the pins 1, 2 and 3 of the LDO linear voltage stabilizer U2 are connected with the capacitor C8, the capacitor C9 and the inductor L1; one end of the capacitor C10 is connected with the capacitor C8 and the capacitor C9 and grounded, and the other end is connected with the inductor L1 and the pins 9, 31, 45, 59, 80 and 94 of the single-chip microcomputer U3.

[0017] The capacitor C25 and the capacitor C26 are connected in parallel, one end is connected with the resistor R99 and the pins 5, 7, 8 of the LDO linear voltage stabilizer U7, the other end is grounded; the resistor R99 is connected with the inductor L4; one end of the capacitor C33 is connected with the pin 6 of the LDO linear voltage stabilizer U7, the other end is grounded; the pins 1, 2, 3 of the LDO linear voltage stabilizer U7 are connected with the capacitor C27 and the capacitor C28; the capacitor C27 and the capacitor C28 are connected and grounded;

[0018] The capacitor C29 and the capacitor C30 are connected in parallel, one end is connected with the resistor R100 and the pins 5, 7, 8 of the LDO linear voltage stabilizer U8, the other end is grounded; the resistor R100 is connected with the inductor L5; one end of the capacitor C34 is connected with the pin 6 of the LDO linear voltage stabilizer U8, the other end is grounded; the pins 1, 2, 3 of the LDO linear voltage stabilizer U8 are connected with the capacitor C31 and the capacitor C32; the capacitor C31 and the capacitor C32 are connected and grounded;

[0019] The capacitor C35 and the capacitor C36 are connected in parallel, one end is connected with the resistor R103 and the pins 5, 7, 8 of the LDO linear voltage stabilizer U9, the other end is grounded; the resistor R103 is connected with the inductor L6; one end of the capacitor C43 is connected with the pin 6 of the LDO linear voltage stabilizer U9, the other end is grounded; the pins 1, 2, 3 of the LDO linear voltage stabilizer U9 are connected with the capacitor C37 and the capacitor C38; the capacitor C37 and the capacitor C38 are connected and grounded;

[0020] The capacitor C39 and the capacitor C40 are connected in parallel, one end is connected with the resistor R104 and the pins 0, 7, 8 of the LDO linear voltage stabilizer U10, the other end is connected with the pin 6 of the LDO linear voltage stabilizer U10 and grounded; the resistor R104 is connected with the inductor L7; the pin 4 of the LDO linear voltage stabilizer U10 is connected with the capacitor C44 and the resistor R106; the capacitor C41 and the capacitor C42 are connected in parallel, one end is connected with the pins 1, 2 of the LDO linear voltage stabilizer U10, the other end is grounded.

[0021] Further, the front-stage power supply module comprises a voltage stabilizing diode D4, a diode D8, a resistor R29, a capacitor C11, a capacitor C12, a capacitor C13, a capacitor C14, a capacitor C19, a capacitor C20, a capacitor C21, a capacitor C22 and a capacitor C23;

[0022] The capacitor C19, the capacitor C20, the capacitor C21, the capacitor C22 and the capacitor C23 are connected in parallel, one end is connected with the output end of the diode D8 and the rear-stage power supply switch module, the other end is grounded;

[0023] The voltage stabilizing diode D4, the capacitor C11, the capacitor C12, the capacitor C13 and the capacitor C14 are connected in parallel, the input end of the voltage stabilizing diode D4 is connected with the ground, and the output end is connected with the resistor R29 and the power supply switch module.

[0024] Further, the power supply state prompting module comprises a resistor R42, a resistor R43, a light emitting diode D5, a light emitting diode D6 and a MOS tube Q1.

[0025] The input end of the light emitting diode D5 is connected with the resistor R42, and the output end is connected with the power supply switch module; the input end of the light emitting diode D6 is connected with the resistor R43, and the output end is connected with the drain of the MOS tube Q1; the source of the MOS tube Q1 is connected with the power supply switch module.

[0026] The application has the advantages that:

[0027] By setting the single-chip microcomputer U3, the power supply switch module, the power supply level conversion module, the power supply module and the power supply state prompting module, the power supply module is stabilized by the series connection of the resistor R29 and the voltage stabilizing diode D4, the power supply is prevented from being connected reversely by the series connection of the diode D8, the power supply impact caused by sudden power failure or transient switch is avoided by setting the capacitors C11, C12, C13, C14, C19, C20, C21, C22 and C23, the influence caused by the shaking of the reset button K1 is eliminated by the switch switch protector U4, the control level of the power-on timing is output by the power supply level conversion module, and the current working state of the protection device is indicated by the power supply state prompting module, that is, the power supply switch module is controlled to work by the single-chip microcomputer U3, the power supply of the power supply test equipment is powered on by the power supply level conversion module according to the preset power-on timing before the system of the power supply test equipment is initialized, the power supply of the power supply test equipment is powered on by the power supply switch module after the system is initialized, and the stability of the power supply test equipment is greatly improved. BRIEF DESCRIPTION OF DRAWINGS

[0028] The application will be further described below with reference to the embodiments and the accompanying drawings.

[0029] Figure 1 It is a circuit principle block diagram of the power supply protection device for lithium battery test.

[0030] Figure 2 It is a circuit diagram of the power supply switch module.

[0031] Figure 3is the circuit diagram of the power supply level conversion module of the application.

[0032] Figure 4 is the circuit diagram of the power supply module of the application.

[0033] Figure 5 is the circuit diagram of the power supply state prompting module of the application.

[0034] Figure 6 is the circuit diagram of the single-chip microcomputer U3 of the application. DETAILED DESCRIPTION

[0035] The technical scheme in the embodiment of the application has the following general idea: the single-chip microcomputer U3 controls the power supply of the rear stage to be powered on according to the preset power-on sequence through the power supply switch module of the rear stage and the power supply level conversion module of the rear stage, and after the system is initialized, the power supply of the rear stage of the power supply test device is powered on, the power supply module of the front stage stabilizes the input voltage through the series connection of the resistor R29 and the stabilizing diode D4, prevents the power supply from being connected reversely through the series connection of the diode D8, avoids the power supply impact caused by sudden power failure or transient switch through the setting of a plurality of capacitors, and eliminates the influence of the shaking of the reset button K1 through the setting of the switch protection device U4, so as to improve the stability of the power supply test device.

[0036] Please refer to Figures 1 to 6 The preferred embodiment of the power supply protection device for lithium battery test of the application comprises a single-chip microcomputer U3, a power supply switch module of the rear stage, a power supply level conversion module of the rear stage, a power supply module of the front stage, and a power supply state prompting module.

[0037] The single-chip microcomputer U3 is used for controlling the work of the protection device, and the model is preferably EPM240T100C5NTQFP-100; the power supply switch module of the rear stage is used for controlling the power supply switch of the rear stage system of the power supply test device; the power supply level conversion module of the rear stage is used for converting the level input by the power supply module of the front stage into different power-on sequences and then used as the power supply of the rear stage system; the power supply module of the front stage is used for connecting the power supply and supplying power for the rear stage system; and the power supply state prompting module is used for indicating the current working state of the protection device, that is, indicating whether the rear stage system is in the power-on state or the standby state.

[0038] The power supply switch module of the rear stage is connected with the single-chip microcomputer U3, the power supply level conversion module of the rear stage, the power supply module of the front stage, and the power supply state prompting module; and the power supply level conversion module of the rear stage is connected with the single-chip microcomputer U3.

[0039] The rear power supply switch module comprises a switch protection device U4, a D-type flip-flop U5, an optical coupler U6, an optical coupler U13, a MOS tube Q2, a MOS tube Q3, a MOS tube Q6, a reset button K1, a resistor R50, a resistor R58, a resistor R67, a resistor R68, a resistor R96, a resistor R97, a resistor R110, a capacitor C15, a capacitor C16, a diode D7 and a diode D12; the model of the switch protection device U4 is preferably MAX6816, which is used for eliminating mechanical jitter generated by the reset button K1; the D-type flip-flop U5 is a single-path positive edge trigger D-type flip-flop, and the model thereof is preferably SN74LVC1G79; the models of the optical coupler U6 and the optical coupler U13 are preferably TLP291;

[0040] Pin 2 of the switch protection device U4 is connected with the reset button K1, pin 3 is connected with pin 2 of the D-type flip-flop U5, and pin 4 is connected with the front power supply module; one end of the resistor R50 is connected with the front power supply module, and the other end is connected with pin 1 of the D-type flip-flop U5, the drain of the MOS tube Q2 and the power supply state prompt module; pin 4 of the D-type flip-flop U5 is connected with the resistor R68, and pin 5 is connected with the front power supply module;

[0041] The gate of the MOS tube Q2 is connected with the resistor R58 and the capacitor C15, and the source is connected with the capacitor C15; the gate of the MOS tube Q3 is connected with the resistor R58, the resistor R68 and the capacitor C16, the source is connected with the capacitor C16, and the drain is connected with the power supply state prompt module and the rear power supply level conversion module;

[0042] The C pole of the optical coupler U13 is connected with the reset button K1, the E pole and the K pole are both connected with the input end of the diode D12 and the E pole of the optical coupler U6, and the A pole is connected with the resistor R67, the output end of the diode D12 and the C pole of the optical coupler U6; the resistor R67 is connected with the front power supply module; the A pole of the optical coupler U6 is connected with the resistor R96 and the output end of the diode D7, the K pole is connected with the input end of the diode D7 and the drain of the MOS tube Q6; the resistor R96 is connected with the rear power supply level conversion module;

[0043] The drain of the MOS tube Q6 is connected with the resistor R110, the gate is connected with the resistor R97, the resistor R110 and pin 50 of the single-chip microcomputer U3; the resistor R97 is connected with the rear power supply level conversion module.

[0044] The rear power level conversion module includes a DCDC chip U1, an LDO linear voltage stabilizer U2, an LDO linear voltage stabilizer U7, an LDO linear voltage stabilizer U8, an LDO linear voltage stabilizer U9, an LDO linear voltage stabilizer U10, a transformer L3, a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C4, a capacitor C5, a capacitor C6, a capacitor C7, a capacitor C8, a capacitor C9, a capacitor C10, a capacitor C18, a capacitor C24, a capacitor C25, a capacitor C26, a capacitor C27, a capacitor C28, a capacitor C29, a capacitor C30, a capacitor C31, a capacitor C32, a capacitor C33, a capacitor C34, a capacitor C35, a capacitor C36, a capacitor C37, a capacitor C38, a capacitor C39, a capacitor C40, a capacitor C41, a capacitor C42, a capacitor C43, a capacitor C44, an inductor L1, an inductor L2, an inductor L4, an inductor L5, an inductor L6, an inductor L7, an inductor L10, a diode D1, a resistor R1, a resistor R3, a resistor R99, a resistor R100, a resistor R103, a resistor R104, and a resistor R106; the model number of the DCDC chip U1 is preferably G2409S-2WR2, which has the function of configuring the power-on time; the model number of the LDO linear voltage stabilizer U2 is preferably ADP7118ARDZ-3.3-R7; the model numbers of the LDO linear voltage stabilizer U7, the LDO linear voltage stabilizer U8, and the LDO linear voltage stabilizer U9 are preferably ADP7118ARDZ-5.0-R7; and the model number of the LDO linear voltage stabilizer U10 is preferably ADP7182ACPZ-5.0-R7.

[0045] The capacitor C2 and the capacitor C3 are connected in parallel, one end of which is connected to the pin 1 of the transformer L3, and the other end of which is connected to the pin 4 of the transformer L3 and the rear power supply switch module; the capacitor C4 and the capacitor C5 are connected in parallel, one end of which is connected to the pin 2 of the transformer L3 and the pin 1 of the DCDC chip U1, and the other end of which is connected to the pin 3 of the transformer L3 and the pin 2 of the DCDC chip U1; the pin 5 of the DCDC chip U1 is connected to the capacitor C24, the resistor R1, and the inductor L7, the pin 6 is connected to the capacitor C1 and the capacitor C24 and grounded, and the pin 7 is connected to the capacitor C1, the inductor L2, the inductor L4, the inductor L5, and the inductor L6; the input end of the diode D1 is connected to the inductor L2, the inductor L10, and the rear power supply switch module, and the output end is connected to the resistor R1.

[0046] The capacitor C6 and the capacitor C7 are connected in parallel, one end is connected with the resistor R3 and the pins 5, 7, 8 of the LDO linear voltage regulator U2, the other end is grounded; the resistor R3 is connected with the inductor L10; one end of the capacitor C18 is connected with the pin 6 of the LDO linear voltage regulator U2, the other end is grounded; the pins 1, 2, 3 of the LDO linear voltage regulator U2 are connected with the capacitor C8, the capacitor C9 and the inductor L1; one end of the capacitor C10 is connected with the capacitor C8 and the capacitor C9 and grounded, the other end is connected with the inductor L1 and the pins 9, 31, 45, 59, 80, 94 of the single-chip microcomputer U3;

[0047] The capacitor C25 and the capacitor C26 are connected in parallel, one end is connected with the resistor R99 and the pins 5, 7, 8 of the LDO linear voltage regulator U7, the other end is grounded; the resistor R99 is connected with the inductor L4; one end of the capacitor C33 is connected with the pin 6 of the LDO linear voltage regulator U7, the other end is grounded; the pins 1, 2, 3 of the LDO linear voltage regulator U7 are connected with the capacitor C27 and the capacitor C28; the capacitor C27 is connected with the capacitor C28 and grounded;

[0048] The capacitor C29 and the capacitor C30 are connected in parallel, one end is connected with the resistor R100 and the pins 5, 7, 8 of the LDO linear voltage regulator U8, the other end is grounded; the resistor R100 is connected with the inductor L5; one end of the capacitor C34 is connected with the pin 6 of the LDO linear voltage regulator U8, the other end is grounded; the pins 1, 2, 3 of the LDO linear voltage regulator U8 are connected with the capacitor C31 and the capacitor C32; the capacitor C31 is connected with the capacitor C32 and grounded;

[0049] The capacitor C35 and the capacitor C36 are connected in parallel, one end is connected with the resistor R103 and the pins 5, 7, 8 of the LDO linear voltage regulator U9, the other end is grounded; the resistor R103 is connected with the inductor L6; one end of the capacitor C43 is connected with the pin 6 of the LDO linear voltage regulator U9, the other end is grounded; the pins 1, 2, 3 of the LDO linear voltage regulator U9 are connected with the capacitor C37 and the capacitor C38; the capacitor C37 is connected with the capacitor C38 and grounded;

[0050] The capacitor C39 and the capacitor C40 are connected in parallel, one end is connected with the resistor R104 and the pins 0, 7, 8 of the LDO linear voltage regulator U10, the other end is connected with the pin 6 of the LDO linear voltage regulator U10 and grounded; the resistor R104 is connected with the inductor L7; the pin 4 of the LDO linear voltage regulator U10 is connected with the capacitor C44 and the resistor R106; the capacitor C41 and the capacitor C42 are connected in parallel, one end is connected with the pins 1, 2 of the LDO linear voltage regulator U10, the other end is grounded.

[0051] The front-stage power supply module comprises a voltage stabilizing diode D4, a diode D8, a resistor R29, a capacitor C11, a capacitor C12, a capacitor C13, a capacitor C14, a capacitor C19, a capacitor C20, a capacitor C21, a capacitor C22 and a capacitor C23; the model of the voltage stabilizing diode D4 is preferably MM1Z5V1;

[0052] The capacitor C19, the capacitor C20, the capacitor C21, the capacitor C22 and the capacitor C23 are connected in parallel with each other, one end of which is connected with the output end of the diode D8 and the rear-stage power supply switch module, and the other end of which is grounded;

[0053] The voltage stabilizing diode D4, the capacitor C11, the capacitor C12, the capacitor C13 and the capacitor C14 are connected in parallel with each other, the input end of the voltage stabilizing diode D4 is grounded, and the output end is connected with the resistor R29 and the rear-stage power supply switch module.

[0054] The power supply state prompting module comprises a resistor R42, a resistor R43, a light-emitting diode D5, a light-emitting diode D6 and a MOS tube Q1; the MOS tube Q1, the MOS tube Q2, the MOS tube Q3 and the MOS tube Q6 are all NMOS tubes, and the model is preferably NCE2312;

[0055] The input end of the light-emitting diode D5 is connected with the resistor R42, and the output end is connected with the rear-stage power supply switch module; the input end of the light-emitting diode D6 is connected with the resistor R43, and the output end is connected with the drain of the MOS tube Q1; the source of the MOS tube Q1 is connected with the rear-stage power supply switch module.

[0056] The working principle of the present application is as follows:

[0057] When the rear-stage power supply switch module is in the closed state:

[0058] When the rear power supply switch module is in the closed state, the reset button K1 does not form a pressing and releasing action, the pin 3 of the switch protection device U4 continuously outputs a high level, at this time the pin 2 of the D-type flip-flop U5 does not identify a rising edge signal, so the output level of the pin 4 of the D-type flip-flop U5 still remains in a low level state, and the level signal controls the corresponding actions of the MOS tube Q2 and the MOS tube Q3 through the resistors R68 and R58. Because the network number PCON_2 is a low level signal, the MOS tube Q2 and the MOS tube Q3 are in the cut-off state, and the light emitting diode D5 does not emit light at this time. The capacitors C15 and C16 are added between the gate and the source of the MOS tube Q2 and the MOS tube Q3 to act with the resistors R68 and R58, so that the switching action of the high and low level conversion of the control signal of the MOS tube Q2 and the MOS tube Q3 reaches the effect of slow start, avoiding the impact of transient switching on the power supply of the rear stage. Because the MOS tube Q2 and the MOS tube Q3 are in the cut-off state, the network number PCON_3 forms a high level signal through the pull-up action of the resistor R50 at this time, and the signal is transmitted to the pin 1 of the D-type flip-flop U5 and the gate of the MOS tube Q1. Under the high level state of PCON_3, the MOS tube Q1 enters the saturation state, and the drain and source of the MOS tube Q1 are in the conduction state. When the MOS tube Q1 enters the saturation state, the light emitting diode D6 lights up, indicating that the system is in the standby state at this time. Because the rear power supply switch module of the system is in the closed state at this time, the control pin FRONT_POWER_SET of the single-chip microcomputer U3 is in the input state when it is not configured and powered on, so the network number FRONT_POWER_SET is pulled up to the level of V+ by the resistor R97 at this time. Because the rear power supply of the system is not powered on, V+ does not output a corresponding high level, so the MOS tube Q6 is still in the cut-off state at this time, and the C pole and the E pole of the optocoupler U6 are in the cut-off state, which does not affect the level state of the network number PCON_7. Therefore, by selecting the corresponding parameters of the resistor R67, the optocoupler U13 can form a current supply through the network number +24V-P and the resistor R67, so that the C pole and the E pole of the optocoupler U13 are in the saturation conduction state. Therefore, when the rear power supply switch module is in the closed state, the system prompts the working state through the light emitting diode D6, and the C pole and the E pole of the optocoupler U13 are in the saturation conduction state, so that the network number PCON_6 can be effectively connected with GND-P. Therefore, the reset button K1 can form an effective high-low level state switching at the pin 2 of the switch protection device U4 under the clicking action, and the corresponding operation of the reset button K1 is an effective operation.

[0059] When the rear power supply switch module is in the closed state:

[0060] When the reset button K1 is pressed and released, the operation of the reset button K1 is effectively transmitted to the pin 2 of the switch switching protector U4 through the high and low level switching because the C pole and the E pole of the optocoupler U13 are in the saturated conduction state at this time. The switch switching protector U4 performs the dithering elimination processing through the corresponding time delay by judging the operation time of the reset button K1. When the operation time of the reset button K1 reaches the effective time judged by the switch switching protector U4, the pin 3 of the switch switching protector U4 is switched from the high level to the low level when the reset button K1 is pressed, and is switched from the low level to the high level when the reset button K1 is released, thereby providing a CLK edge switching signal to the pin 2 of the D-type flip-flop U5. At this time, the pin 2 of the D-type flip-flop U5 recognizes a rising edge signal because the pin 1 of the D-type flip-flop U5 is in the high level state at this trigger time. Therefore, after the pin 2 of the D-type flip-flop U5 receives the signal, the output level of the pin 4 is converted from the original low level state to the high level state. The high level signal controls the MOS transistor Q2 and the MOS transistor Q3 through the resistors R68 and R58. Because the network number PCON_2 is a high level signal at this time, the MOS transistor Q2 and the MOS transistor Q3 enter the saturated conduction state. Because the drain and the source of the MOS transistor Q3 are in the conduction state, the network number -VO is connected to the GND-P at this time, and the light emitting diode D5 is lit. The DCDC chip U1 in the rear stage power level conversion module starts to enter the power-on working state. Because the drain and the source of the MOS transistor Q2 are in the conduction state, the level state of the network number PCON_3 is switched from the original high level signal to the low level signal, and the signal is transmitted to the pin 1 of the D-type flip-flop U5 and the gate of the MOS transistor Q1, respectively. The MOS transistor Q1 enters the cut-off state in the low level state of PCON_3, and the drain and the source of the MOS transistor Q1 are not in the conduction state when the MOS transistor Q1 enters the cut-off state, and the light emitting diode D6 is not lit.At this time, the power supply switch module of the system enters the working state, the pins 5, 6 and 7 of the DCDC chip U1 start to output corresponding voltages, because the control pin FRONT_POWER_SET of the single-chip microcomputer U3 is in the input state when the program is not configured, at this time, the network number FRONT_POWER_SET will lift the level to the level of V+ under the action of the resistor R97, because the rear power supply of the system is in the power-on state, V+ relative to GND has formed a high level, so the V+ output corresponding high level under the voltage division of the resistor R97 and the resistor R110, makes the MOS tube Q6 enter the saturation conduction state, at this time, the drain and source of the MOS tube Q6 are in the conduction state, PCON_5 is in the low level state, the output of the optocoupler U6 is in the conduction state under the action of the resistor R96 and the output level of V+, and then the level state of the network number PCON_7 is pulled down to the low level state. At this time, the loop of the A pole and the K pole of the optocoupler U13 cannot obtain the corresponding current, so the C pole and the E pole of the optocoupler U13 are in the cut-off state, and the side of the reset button K1 cannot effectively access the low level signal, so the operation of the reset button K1 at this time will enter the invalid state, and the operation on the reset button K1 will not affect the level of the pin 2 of the switch switching protector U4, and cannot control the switching action of the power supply.

[0061] When the power supply switch module of the rear stage is just started:

[0062] The pins 5, 6 and 7 of the DCDC chip U1 stably output corresponding levels, the LDO linear voltage stabilizer U2 controls the power-on time of the output voltage of the VOUT pin by configuring the capacitance value of the capacitor C18 connected to the pin 6, the LDO linear voltage stabilizer U7, the LDO linear voltage stabilizer U8 and the LDO linear voltage stabilizer U9 respectively control the power-on time of the output voltage of the corresponding VOUT pin by the capacitance value connected to the pin 6 of each, and the LDO linear voltage stabilizer U10 controls the power-on time of the output voltage of the VOUT pin by the parameter setting of the output voltage of the network number +5VD, the resistor R106 and the capacitor C44. Users can configure the corresponding power-on time according to the chips used subsequently to meet the power-on time sequence requirements of the selected chips.

[0063] When the power supply voltage of the whole system reaches the set condition, the single-chip microcomputer U3 starts to enter the initialization execution state, and after the initialization execution is completed, a low level is output through the pin 50 of the single-chip microcomputer U3, the MOS tube Q6 enters the cut-off state, the A pole and the K pole of the optocoupler U6 cannot flow into the required current size, so the C pole and the E pole of the optocoupler U6 enter the cut-off state, and the network number PCON_7 is not affected, the network number PCON_7 is not controlled by the optocoupler U6 at this time, and the A pole and the K pole of the optocoupler U13 can be driven by the voltage network number +24V-P and the current of the resistor R67, so that the C pole and the E pole enter the conduction state. The C pole and the E pole of the optocoupler U13 are in a saturated conduction state, so that the network number PCON_6 can be effectively connected with GND-P. Therefore, the reset button K1 can form an effective high-low level state switching at the pin 2 of the switch switching protector U4 in the next click action. Therefore, after the system is powered on, the operation control of the reset button K1 will be effective after the initialization of the single-chip microcomputer U3 is completed, so as to ensure that the initialization is not affected by the power supply switch, thereby avoiding the damage to the stability and function of the power supply test equipment in the power-on process, and achieving the protection effect of the lithium battery test equipment in the power supply switch process.

[0064] In summary, the advantages of the present application are:

[0065] By setting the single-chip microcomputer U3, the rear power supply switch module, the rear power supply level conversion module, the front power supply module and the power supply state prompting module, the front power supply module stabilizes the input voltage through the series connection of the resistor R29 and the stabilizing diode D4, prevents the power supply from being connected reversely through the series connection of the diode D8, and avoids the power supply impact caused by sudden power failure or transient switch through the setting of the capacitors C11, C12, C13, C14, C19, C20, C21, C22 and C23. The rear power supply switch module eliminates the influence caused by the reset button K1 shaking through the switch switching protector U4. The rear power supply level conversion module outputs the control level of the power-on sequence. The power supply state prompting module indicates the current working state of the protection device, that is, the single-chip microcomputer U3 controls the rear power supply switch module to work, so that the rear power supply is powered on according to the preset power-on sequence through the rear power supply level conversion module before the system of the power supply test equipment is initialized, and after the system is initialized, the rear power supply switch module is used to power on the rear system of the power supply test equipment, thereby greatly improving the stability of the power supply test equipment.

[0066] While the foregoing description has described specific embodiments of the application, one ordinary skill in the art will appreciate that various modifications and changes can be made thereto without departing from the spirit and scope of the application, as set forth in the appended claims.

Claims

1. A power supply protection device for lithium battery testing, characterized by: The power supply device comprises a single-chip microcomputer U3, a rear power supply switch module, a rear power supply level conversion module, a front power supply module and a power supply state prompting module. The rear power supply switch module is connected with the single-chip microcomputer U3, the rear power supply level conversion module, the front power supply module and the power supply state prompting module. The rear power supply switch module comprises a switch protection device U4, a D-type flip-flop U5, an optical coupler U6, an optical coupler U13, a MOS tube Q2, a MOS tube Q3, a MOS tube Q6, a reset button K1, a resistor R50, a resistor R58, a resistor R67, a resistor R68, a resistor R96, a resistor R97, a resistor R110, a capacitor C15, a capacitor C16, a diode D7 and a diode D12. Pin 2 of the switch protection device U4 is connected with the reset button K1, pin 3 is connected with pin 2 of the D-type flip-flop U5, and pin 4 is connected with the front power supply module. One end of the resistor R50 is connected with the front power supply module, and the other end is connected with pin 1 of the D-type flip-flop U5, the drain of the MOS tube Q2 and the power supply state prompting module. Pin 4 of the D-type flip-flop U5 is connected with the resistor R68, and pin 5 is connected with the front power supply module. The gate of the MOS tube Q2 is connected with the resistor R58 and the capacitor C15, and the source is connected with the capacitor C15. The gate of the MOS tube Q3 is connected with the resistor R58, the resistor R68 and the capacitor C16, the source is connected with the capacitor C16, and the drain is connected with the power supply state prompting module and the rear power supply level conversion module. The C pole of the optical coupler U13 is connected with the reset button K1, the E pole and the K pole are both connected with the input end of the diode D12 and the E pole of the optical coupler U6, and the A pole is connected with the resistor R67, the output end of the diode D12 and the C pole of the optical coupler U6. The resistor R67 is connected with the front power supply module. The A pole of the optical coupler U6 is connected with the resistor R96 and the output end of the diode D7, and the K pole is connected with the input end of the diode D7 and the drain of the MOS tube Q6. The resistor R96 is connected with the rear power supply level conversion module. The drain of the MOS tube Q6 is connected with the resistor R110, the gate is connected with the resistor R97, the resistor R110 and pin 50 of the single-chip microcomputer U3, and the resistor R97 is connected with the rear power supply level conversion module.

2. A power supply protection device for lithium battery testing as defined in claim 1, wherein: The rear power level conversion module includes a DCDC chip U1, an LDO linear voltage stabilizer U2, an LDO linear voltage stabilizer U7, an LDO linear voltage stabilizer U8, an LDO linear voltage stabilizer U9, an LDO linear voltage stabilizer U10, a transformer L3, a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C4, a capacitor C5, a capacitor C6, a capacitor C7, a capacitor C8, a capacitor C9, a capacitor C10, a capacitor C18, a capacitor C24, a capacitor C25, a capacitor C26, a capacitor C27, a capacitor C28, a capacitor C29, a capacitor C30, a capacitor C31, a capacitor C32, a capacitor C33, a capacitor C34, a capacitor C35, a capacitor C36, a capacitor C37, a capacitor C38, a capacitor C39, a capacitor C40, a capacitor C41, a capacitor C42, a capacitor C43, a capacitor C44, an inductor L1, an inductor L2, an inductor L4, an inductor L5, an inductor L6, an inductor L7, a diode D1, a resistor R1, a resistor R3, a resistor R99, a resistor R100, a resistor R103, a resistor R104, and a resistor R106; The capacitor C2 and the capacitor C3 are connected in parallel, one end is connected with the pin 1 of the transformer L3, and the other end is connected with the pin 4 of the transformer L3 and the rear power supply switch module; the capacitor C4 and the capacitor C5 are connected in parallel, one end is connected with the pin 2 of the transformer L3 and the pin 1 of the DCDC chip U1, and the other end is connected with the pin 3 of the transformer L3 and the pin 2 of the DCDC chip U1; the pin 5 of the DCDC chip U1 is connected with the capacitor C24, the resistor R1 and the inductor L7, the pin 6 is connected with the capacitor C1 and the capacitor C24 and grounded, and the pin 7 is connected with the capacitor C1, the inductor L2, the inductor L4, the inductor L5 and the inductor L6; the input end of the diode D1 is connected with the inductor L2, the inductor L10 and the rear power supply switch module, and the output end is connected with the resistor R1; The capacitor C6 and the capacitor C7 are connected in parallel, one end is connected with the resistor R3 and the pins 5, 7 and 8 of the LDO linear voltage stabilizer U2, and the other end is grounded; the resistor R3 is connected with the inductor L10; one end of the capacitor C18 is connected with the pin 6 of the LDO linear voltage stabilizer U2, and the other end is grounded; the pins 1, 2 and 3 of the LDO linear voltage stabilizer U2 are connected with the capacitor C8, the capacitor C9 and the inductor L1; one end of the capacitor C10 is connected with the capacitor C8 and the capacitor C9 and grounded, and the other end is connected with the inductor L1 and the pins 9, 31, 45, 59, 80 and 94 of the single-chip microcomputer U3; The capacitor C25 and the capacitor C26 are connected in parallel, one end of which is connected with the resistor R99 and the pins 5, 7 and 8 of the LDO linear voltage regulator U7, and the other end of which is grounded; the resistor R99 is connected with the inductor L4; one end of the capacitor C33 is connected with the pin 6 of the LDO linear voltage regulator U7, and the other end of which is grounded; the pins 1, 2 and 3 of the LDO linear voltage regulator U7 are connected with the capacitor C27 and the capacitor C28; the capacitor C27 is connected with the capacitor C28 and grounded; The capacitor C29 and the capacitor C30 are connected in parallel, one end of which is connected with the resistor R100 and the pins 5, 7 and 8 of the LDO linear voltage regulator U8, and the other end of which is grounded; the resistor R100 is connected with the inductor L5; one end of the capacitor C34 is connected with the pin 6 of the LDO linear voltage regulator U8, and the other end of which is grounded; the pins 1, 2 and 3 of the LDO linear voltage regulator U8 are connected with the capacitor C31 and the capacitor C32; the capacitor C31 is connected with the capacitor C32 and grounded; The capacitor C35 and the capacitor C36 are connected in parallel, one end of which is connected with the resistor R103 and the pins 5, 7 and 8 of the LDO linear voltage regulator U9, and the other end of which is grounded; the resistor R103 is connected with the inductor L6; one end of the capacitor C43 is connected with the pin 6 of the LDO linear voltage regulator U9, and the other end of which is grounded; the pins 1, 2 and 3 of the LDO linear voltage regulator U9 are connected with the capacitor C37 and the capacitor C38; the capacitor C37 is connected with the capacitor C38 and grounded; The capacitor C39 and the capacitor C40 are connected in parallel, one end of which is connected with the resistor R104 and the pins 0, 7 and 8 of the LDO linear voltage regulator U10, and the other end of which is connected with the pin 6 of the LDO linear voltage regulator U10 and grounded; the resistor R104 is connected with the inductor L7; the pin 4 of the LDO linear voltage regulator U10 is connected with the capacitor C44 and the resistor R106; the capacitor C41 and the capacitor C42 are connected in parallel, one end of which is connected with the pins 1 and 2 of the LDO linear voltage regulator U10, and the other end of which is grounded.

3. A power supply protection device for lithium battery testing as defined in claim 1, wherein: The front-stage power supply module comprises a voltage stabilizing diode D4, a diode D8, a resistor R29, a capacitor C11, a capacitor C12, a capacitor C13, a capacitor C14, a capacitor C19, a capacitor C20, a capacitor C21, a capacitor C22 and a capacitor C23; The capacitor C19, the capacitor C20, the capacitor C21, the capacitor C22 and the capacitor C23 are connected in parallel, one end of which is connected with the output end of the diode D8 and the rear-stage power supply switch module, and the other end of which is grounded; The voltage stabilizing diode D4, the capacitor C11, the capacitor C12, the capacitor C13 and the capacitor C14 are connected in parallel, the input end of the voltage stabilizing diode D4 is grounded, and the output end of the voltage stabilizing diode D4 is connected with the resistor R29 and the rear-stage power supply switch module.

4. A power supply protection device for lithium battery testing as defined in claim 1, wherein: The power supply state prompting module comprises a resistor R42, a resistor R43, a light emitting diode D5, a light emitting diode D6 and a MOS tube Q1; The input end of the light emitting diode D5 is connected with the resistor R42, and the output end is connected with the power supply switch module; the input end of the light emitting diode D6 is connected with the resistor R43, and the output end is connected with the drain of the MOS tube Q1; the source of the MOS tube Q1 is connected with the power supply switch module.

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