CN116111832A

CN116111832A - Power supply protection device for lithium battery test

Info

Publication number: CN116111832A
Application number: CN202211640169.4A
Authority: CN
Inventors: 李有财; 陈言祥; 朱哲浩; 邓秉杰; 吴煌麒
Original assignee: Fujian Nebula Electronics Co Ltd
Current assignee: Fujian Nebula Electronics Co Ltd
Priority date: 2022-12-20
Filing date: 2022-12-20
Publication date: 2023-05-12

Abstract

The invention provides a power supply protection device for lithium battery test, belonging to the technical field of lithium battery test equipment protection, which comprises a singlechip U3, a rear-stage power supply switch module, a rear-stage power supply level conversion module, a front-stage power supply module and a power supply state prompt module; the rear-stage power supply switch module is respectively connected with the singlechip U3, the rear-stage power supply level conversion module, the front-stage power supply module and the power supply state prompting module; and the rear-stage power level conversion module is connected with the singlechip U3. The invention has the advantages that: the stability of the operation of the power supply test equipment is greatly improved.

Description

Power supply protection device for lithium battery test

Technical Field

The invention relates to the technical field of protection of lithium battery test equipment, in particular to a power supply protection device for lithium battery test.

Background

Along with the rapid development of lithium battery technology, the requirements on the stability of lithium battery test equipment under different conditions and different environments are rapidly developed towards the directions of higher requirements and higher standards; in order to adapt to the rapid development of lithium battery technology, the functions of the lithium battery test equipment are continuously increased and updated, and correspondingly, the overall design complexity and precision of the lithium battery test equipment are also improved.

In order to ensure that the lithium battery test equipment can stably run under different operation conditions, the stability of power supply of the lithium battery test equipment in the process of initial power supply is required to be ensured, the lithium battery test equipment is not influenced by a switch before the initialization state of the whole system is finished, because in the circuit of the lithium battery test equipment, chips at all key positions have high requirements on the power-on time sequence, if in the power-on process, the system of the whole lithium battery test equipment does not reach the power-on and power-off of the jitter performance under the condition of the initialization completion state, or the power-on time sequence of all the chips is damaged due to the fact that the system is not stabilized by an electric shock source switch, the power-on time sequence of all the chips is damaged, meanwhile, the power source impact is possibly caused to the internal circuit of the lithium battery test equipment, the stability of the internal circuit is damaged due to the power source impact, and the worse result is that the internal circuit is damaged under the power source impact.

However, the conventional lithium battery test equipment simply increases the mechanical switch to design a power switch, and the power supply in the power-on process is continuously deficient, namely, in the power-on process of the lithium battery test equipment, the power supply is easily affected by mechanical shake generated in the switching process of the mechanical switch, is easily affected by power supply impact caused by the error touch of the power switch, and further affects the stability of the power supply test equipment.

Therefore, how to provide a power supply protection device for lithium battery test to improve the running stability of the power supply test equipment is a technical problem to be solved urgently.

Disclosure of Invention

The invention aims to solve the technical problem of providing a power supply protection device for lithium battery test, which is used for improving the running stability of power supply test equipment.

The invention is realized in the following way: the power supply protection device for lithium battery test comprises a singlechip U3, a rear-stage power supply switch module, a rear-stage power supply level conversion module, a front-stage power supply module and a power supply state prompt module;

the rear-stage power supply switch module is respectively connected with the singlechip U3, the rear-stage power supply level conversion module, the front-stage power supply module and the power supply state prompting module; and the rear-stage power level conversion module is connected with the singlechip U3.

Further, the rear stage power supply switch module includes a switch switching protector U4, a D-type trigger U5, an optocoupler U6, an optocoupler U13, a MOS transistor Q2, a MOS transistor Q3, a MOS transistor Q6, a reset key 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 pin 2 of the switch switching protector U4 is connected with the reset key K1, the pin 3 is connected with the pin 2 of the D-type trigger U5, and the pin 4 is connected with the front-stage power supply module; one end of the resistor R50 is connected with the front-stage power supply module, and the other end of the resistor R is connected with the pin 1 of the D-type trigger U5, the drain electrode of the MOS tube Q2 and the power supply state prompting module; the pin 4 of the D-type trigger U5 is connected with the resistor R68, and the pin 5 is connected with the front-stage power supply module;

the grid electrode of the MOS tube Q2 is connected with the resistor R58 and the capacitor C15, and the source electrode is connected with the capacitor C15; the grid electrode of the MOS tube Q3 is connected with the resistor R58, the resistor R68 and the capacitor C16, the source electrode is connected with the capacitor C16, and the drain electrode is connected with the power supply state prompting module and the later-stage power supply level conversion module;

the C electrode of the optical coupler U13 is connected with the reset key K1, the E electrode and the K electrode are connected with the input end of the diode D12 and the E electrode of the optical coupler U6, and the A electrode is connected with the resistor R67, the output end of the diode D12 and the C electrode of the optical coupler U6; the resistor R67 is connected with the front-stage power supply module; the A pole of the optocoupler 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 electrode of the MOS tube Q6; the resistor R96 is connected with the post-stage power supply level conversion module;

the drain electrode of the MOS tube Q6 is connected with the resistor R110, and the grid electrode is connected with the resistor R97, the resistor R110 and the pin 50 of the singlechip U3; the resistor R97 is connected with the post-stage power supply level conversion module.

Further, the post-stage power level conversion module includes a DCDC chip U1, an LDO linear regulator U2, an LDO linear regulator U7, an LDO linear regulator U8, an LDO linear regulator U9, an LDO linear regulator 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 C39, a capacitor C40, a capacitor C41, a capacitor C42, a capacitor C43, a capacitor L44, an inductor L1, an inductor L2, a resistor R3, a resistor R1, a resistor R3, a resistor R1, a resistor R3;

after the capacitor C2 and the capacitor C3 are connected in parallel, one end of the capacitor C2 is connected with the pin 1 of the transformer L3, and the other end of the capacitor C3 is connected with the pin 4 of the transformer L3 and the power supply switch module of the rear-stage power supply; after the capacitor C4 and the capacitor C5 are connected in parallel, one end of the capacitor C4 is connected with the pin 2 of the transformer L3 and the pin 1 of the DCDC chip U1, and the other end of the capacitor C4 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-stage power supply switch module, and the output end of the diode D1 is connected with the resistor R1;

after the capacitor C6 and the capacitor C7 are connected in parallel, one end of the capacitor C6 is connected with the resistor R3 and pins 5, 7 and 8 of the LDO linear voltage regulator U2, and the other end of the capacitor C7 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, and the other end of the capacitor C is grounded;

pins

1, 2 and 3 of the LDO linear voltage regulator U2 are connected with a capacitor C8, a capacitor C9 and an inductor L1; one end of the capacitor C10 is connected with the capacitor C8 and the capacitor C9 and grounded, and the other end of the capacitor C10 is connected with the inductor L1 and pins 9, 31, 45, 59, 80 and 94 of the singlechip U3;

after the capacitor C25 and the capacitor C26 are connected in parallel, one end of the capacitor C is connected with the resistor R99 and

pins

5, 7 and 8 of the LDO linear voltage regulator U7, and the other end of the capacitor C 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 the capacitor C is grounded;

pins

1, 2 and 3 of the LDO linear voltage regulator U7 are connected with a capacitor C27 and a capacitor C28; the capacitor C27 is connected with the capacitor C28 and grounded;

after the capacitor C29 and the capacitor C30 are connected in parallel, one end of the capacitor C29 is connected with the resistor R100 and

pins

5, 7 and 8 of the LDO linear voltage regulator U8, and the other end of the capacitor C 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 the capacitor C is grounded;

pins

1, 2 and 3 of the LDO linear voltage regulator U8 are connected with a capacitor C31 and a capacitor C32; the capacitor C31 is connected with the capacitor C32 and grounded;

after the capacitor C35 and the capacitor C36 are connected in parallel, one end of the capacitor C35 is connected with the resistor R103 and

pins

5, 7 and 8 of the LDO linear voltage regulator U9, and the other end of the capacitor C36 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 the capacitor C is grounded;

pins

1, 2 and 3 of the LDO linear voltage regulator U9 are connected with a capacitor C37 and a capacitor C38; the capacitor C37 is connected with the capacitor C38 and grounded;

after the capacitor C39 and the capacitor C40 are connected in parallel, one end of the capacitor C39 is connected with the resistor R104 and

pins

0, 7 and 8 of the LDO linear voltage regulator U10, and the other end of the capacitor C39 is connected with the pin 6 of the LDO linear voltage regulator U10 and grounded; the resistor R104 is connected with the inductor L7; pin 4 of the LDO linear voltage regulator U10 is connected with a capacitor C44 and a resistor R106; after the capacitor C41 and the capacitor C42 are connected in parallel, one end of the capacitor C41 is connected with

pins

1 and 2 of the LDO linear voltage regulator U10, and the other end of the capacitor C42 is grounded.

Further, the pre-stage power supply module includes a zener 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;

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

after the zener diode D4, the capacitor C11, the capacitor C12, the capacitor C13 and the capacitor C14 are connected in parallel, the input end of the zener diode D4 is grounded, and the output end is connected with the resistor R29 and the power supply switch module of the rear stage.

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;

the input end of the light-emitting diode D5 is connected with the resistor R42, and the output end of the light-emitting diode D5 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 of the light-emitting diode D is connected with the drain electrode of the MOS tube Q1; and the source electrode of the MOS tube Q1 is connected with a later-stage power supply switch module.

The invention has the advantages that:

the power supply system comprises a singlechip U3, a rear-stage power supply switch module, a rear-stage power supply level conversion module, a front-stage power supply module and a power supply state prompting module; the pre-stage power supply module stabilizes input voltage through series connection of a resistor R29 and a voltage stabilizing diode D4, prevents reverse connection of a power supply through a series connection diode D8, and avoids power supply impact caused by sudden power failure or transient switching through arrangement of 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 power supply switch module of the rear-stage power supply eliminates the influence generated by the shake of the reset key K1 through switching the protector U4; the control level of the power-on time sequence is output through a later-stage power level conversion module; the current working state of the protection device is indicated by the power supply state prompt module, namely, the singlechip U3 is used for controlling the rear-stage power supply switch module to work, so that the rear-stage power supply is controlled by the rear-stage power level conversion module to power up according to a preset power-up time sequence before the system of the power test equipment is initialized, and the rear-stage power supply switch module is used for powering up the rear-stage system of the power test equipment after the system is initialized, so that the running stability of the power test equipment is greatly improved finally.

Drawings

The invention will be further described with reference to examples of embodiments with reference to the accompanying drawings.

Fig. 1 is a schematic block diagram of a power supply protection device for lithium battery testing according to the present invention.

Fig. 2 is a circuit diagram of a post-stage power supply switch module of the present invention.

Fig. 3 is a circuit diagram of a post-stage power level conversion module of the present invention.

Fig. 4 is a circuit diagram of a pre-stage power supply module of the present invention.

Fig. 5 is a circuit diagram of the power supply status prompting module of the present invention.

Fig. 6 is a circuit diagram of the single chip microcomputer U3 of the present invention.

Detailed Description

According to the technical scheme in the embodiment of the application, the overall thought is as follows: the singlechip U3 controls the post-stage power supply to power up according to a preset power-up time sequence through the post-stage power supply switching module and the post-stage power supply level conversion module, and after the system is initialized, the post-stage system of the power test equipment is powered up again, the pre-stage power supply module stabilizes the input voltage through the series connection of the resistor R29 and the voltage stabilizing diode D4, the power supply is prevented from being reversely connected through the series connection diode D8, a plurality of capacitors are arranged to avoid sudden power failure or power impact generated by a transient switch, and the switch switching protector U4 is arranged to eliminate the influence caused by shaking of the reset key K1 so as to improve the running stability of the power test equipment.

Referring to fig. 1 to 6, a preferred embodiment of a power supply protection device for lithium battery testing according to the present invention includes a single chip microcomputer U3, a rear power supply switch module, a rear power level conversion module, a front power supply module and a power supply status prompting module;

the singlechip U3 is used for controlling the work of the protection device, and the model is preferably EPM240T100C5NTQFP-100; the rear-stage power supply switch module is used for controlling a power switch of a rear-stage system of the power supply test equipment; the rear-stage power supply level conversion module is used for converting the level input by the front-stage power supply module into different power-on time sequences and then supplying power to the rear-stage system; the front-stage power supply module is used for accessing a power supply to supply power for the rear-stage system; the power supply state prompting module is used for indicating the current working state of the protection device, namely indicating whether the rear-stage system is in a power-on state or a standby state;

The rear-stage power supply switch module comprises a switch switching protector U4, a D-type trigger U5, an optocoupler U6, an optocoupler U13, a MOS tube Q2, a MOS tube Q3, a MOS tube Q6, a reset key 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 type of the switch switching protector U4 is preferably MAX6816, which is used for eliminating the mechanical shake generated by the reset key K1; the D-type trigger U5 is a single-path positive edge trigger D-type trigger, and the model is preferably SN74LVC1G79; the model numbers of the optical couplers U6 and U13 are preferably TLP291;

The post-stage power level conversion module comprises a DCDC chip U1, an LDO linear voltage regulator U2, an LDO linear voltage regulator U7, an LDO linear voltage regulator U8, an LDO linear voltage regulator U9, an LDO linear voltage regulator 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 C39, a capacitor C40, a capacitor C41, a capacitor C42, a capacitor C43, an inductor C44, an inductor L1, an inductor L2, an inductor R4, an inductor R1, a resistor R3, a resistor R1, a resistor and a resistor; the model of the DCDC chip U1 is preferably G2409S-2WR2, and the DCDC chip has the function of configuring the power-on time; the model of the LDO linear voltage stabilizer U2 is preferably ADP7118ARDZ-3.3-R7; the types 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; the model of the LDO linear voltage stabilizer U10 is preferably ADP7182ACPZ-5.0-R7;

after the capacitor C6 and the capacitor C7 are connected in parallel, one end of the capacitor C6 is connected with the resistor R3 and

pins

5, 7 and 8 of the LDO linear voltage regulator U2, and the other end of the capacitor C7 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, and the other end of the capacitor C is grounded;

pins

1, 2 and 3 of the LDO linear voltage regulator U2 are connected with a capacitor C8, a capacitor C9 and an inductor L1; one end of the capacitor C10 is connected with the capacitor C8 and the capacitor C9 and grounded, and the other end of the capacitor C10 is connected with the inductor L1 and

pins

9, 31, 45, 59, 80 and 94 of the singlechip U3;

pins

The pre-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 zener diode D4 is preferably MM1Z5V1;

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 NMOS tubes, and the model is preferably NCE2312;

The working principle of the invention is as follows:

when the rear-stage power supply switch module is in a closed state:

when the power supply switch module of the rear stage is in the off state, the reset button K1 does not form pressing and releasing actions, the pin 3 of the switch switching protector U4 continuously outputs a high level, at this time, the pin 2 of the D-type trigger U5 does not recognize a rising edge signal, so that the output level of the pin 4 of the D-type trigger U5 still keeps in a low level state, the level signal performs corresponding control actions on the MOS transistor Q2 and the MOS transistor Q3 through the resistor R68 and the resistor R58, and because the network number pcon_2 is a low level signal, the MOS transistor Q2 and the MOS transistor Q3 are in an off state, and at this time, the light emitting diode D5 cannot emit light. Through increasing electric capacity C15 and electric capacity C16 between MOS pipe Q2 and MOS pipe Q3's grid and source and come with resistance R68 and resistance R58 effect for the switching action that forms under the switching of the control signal high low level of MOS pipe Q2 and MOS pipe Q3 reaches the effect of slowly opening, avoids transient switch to produce the impact influence to the power supply of later stage. Because the MOS transistor Q2 and the MOS transistor 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, the signal is respectively transmitted to the pin 1 of the D-type trigger U5 and the grid electrode of the MOS transistor Q1, the MOS transistor Q1 can enter a saturated state in the high-level state of the PCON_3, the drain electrode and the source electrode of the MOS transistor Q1 are in the on state, and the light emitting diode D6 is lightened when the MOS transistor Q1 enters the saturated state to mark that the system is in the standby state at the moment. Because the later POWER supply switch module of the system is in a closed state at this moment, the control pin FRONT_POWER_SET of the singlechip U3 is in an input state when the control pin FRONT_POWER_SET is not configured and is not electrified, the level of the network number FRONT_POWER_SET is raised to the level where V+ is located under the action of the pull-up of the resistor R97, and the corresponding high level is not output by V+ because the later POWER supply of the system is not electrified, so that the MOS transistor Q6 is still in an off state at this moment, the C electrode and the E electrode of the optocoupler U6 are in an off state, the level state of the network number PCON_7 is not influenced, and therefore, the optocoupler U13 is in a saturated on state through the current supply formed by the network number +24V_P and the resistor R67 by selecting corresponding parameters. Therefore, when the power supply switch module of the rear-stage power supply is in a closed state, the system prompts the working state through the light emitting diode D6, and the C pole and the E pole of the optical coupler U13 are in a saturated conduction state, so that the network number PCON_6 can be effectively connected with GND-P. Therefore, the reset key K1 can form effective high-low level state switching at the pin 2 of the switch switching protector U4 under the clicking action, and the corresponding operation of the reset key K1 is effective operation.

When the rear-stage power supply switch module is in a closed-switching-on state:

the reset key K1 is pressed and released once, because the C pole and E pole of the optocoupler U13 are in a saturated conduction state at this time, the operation action of the reset key K1 is effectively transferred to the pin 2 of the switch switching protector U4 through the high-low switching of the level, the switch switching protector U4 carries out jitter elimination processing by judging the operation time of the reset key K1 and carrying out corresponding time delay, when the operation time of the reset key K1 reaches the effective time judged by the switch switching protector U4, the pin 3 of the switch switching protector U4 is switched from high level to low level when the reset key K1 is pressed, then is switched from low level to high level when the reset key K1 is released, and then a CLK edge switching signal is provided for the pin 2 of the D-type trigger U5, at this time, the pin 2 of the D-type flip-flop U5 recognizes a rising edge signal, and since the pin 1 of the D-type flip-flop U5 is in a high level state at this trigger time, 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 performs corresponding control actions on the MOS transistor Q2 and the MOS transistor Q3 through the resistor R68 and the resistor R58, and since the network number pcon_2 is a high level signal at this time, the MOS transistor Q2 and the MOS transistor Q3 enter a saturated conduction state, and since the drain and the source of the MOS transistor Q3 are in a conduction state, the network number-VO is in communication with GND-P at this time, and the light emitting diode transistor D5 is turned on, and the DCDC chip U1 in the post power level conversion module starts to enter an on operation state. Because the drain electrode and the source electrode of the MOS transistor Q2 are in the on 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 signals are transmitted to the pin 1 of the D-type trigger U5 and the gate electrode of the MOS transistor Q1, respectively. Under the low level state of PCON_3, the MOS transistor Q1 enters an off state, when the MOS transistor Q1 enters the off state, the drain electrode and the source electrode are not conducted, and the light emitting diode D6 is not lightened. At this time, the POWER supply switch module of the rear POWER supply of the system starts to enter a working state, 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 an input state when the program is not configured, at this time, the network number front_power_set can raise the level to the level where v+ is located under the action of the resistor R97, because the rear POWER supply of the system is already in a POWER-on state, v+ forms a high level with respect to GND, so that the corresponding high level of v+ is output under the partial pressure action of the resistor R97 and the resistor R110, the MOS transistor Q6 enters a saturated conduction state, at this time, the drain and the source of the MOS transistor Q6 are in a conduction state, pcon_5 is in a low level state, the output of the optocoupler U6 is in a conduction state under the action of the output levels of the resistors R96 and v+, and the level state of the optocoupler U6 is pulled down to a low level state. At this time, the corresponding current cannot be obtained by the loop of the pole a and the loop of the pole K of the optocoupler U13, so that the pole C and the pole E of the optocoupler U13 are in a cut-off state, and the low-level signal cannot be effectively connected to one side of the reset key K1, so that the operation of the reset key K1 enters a failure state at this time, the operation on the reset key K1 cannot affect the level of the pin 2 of the switch protector U4, and the switching action of the power supply cannot be controlled.

When the rear-stage power supply switch module is in the just-opened state:

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 output voltage of a VOUT pin through configuration of the capacitance value of a capacitor C18 butted by 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 through the capacitance value butted by the pins 6, and the LDO linear voltage stabilizer U10 controls the power-on time of the output voltage of the VOUT pin through the output voltage of a network number +5VD, the parameter setting of a resistor R106 and a capacitor C44. The user can configure the corresponding power-on time according to the chip used subsequently to meet the power-on time sequence requirement of the selected chip.

After the power supply voltage of the whole system reaches the set condition, the singlechip U3 starts to enter an initialization execution state, after the initialization execution is finished, a low level is output through a pin 50 of the singlechip U3, the MOS tube Q6 enters a cut-off state, and the A pole and the K pole of the optocoupler U6 cannot flow in the required current, so that the C pole and the E pole of the optocoupler U6 enter the cut-off state, the level state of the network number PCON_7 cannot be influenced, the network number PCON_7 is not controlled by the optocoupler U6 at the moment, and the A pole and the K pole of the optocoupler U13 can enter the on state under the current drive of the voltage network number +24V-P and the resistor R67. The C pole and the E pole of the optical coupler U13 are in a saturated conduction state, so that the network number PCON_6 can be effectively connected with GND-P. Therefore, the reset key K1 can be made to form an effective high-low state switching at the pin 2 of the switching protector U4 in the next click operation. Therefore, after the system is electrified, the operation control of the reset key K1 can be effective only after the initialization of the singlechip U3 is completed, so that the influence of a power switch is avoided before the initialization is completed, the stability and the function of the power test equipment are prevented from being damaged in the electrifying process, and the protection effect of the lithium battery test equipment in the switching process of the power switch is achieved.

In summary, the invention has the advantages that:

While specific embodiments of the invention have been described above, it will be appreciated by those skilled in the art that the specific embodiments described are illustrative only and not intended to limit the scope of the invention, and that equivalent modifications and variations of the invention in light of the spirit of the invention will be covered by the claims of the present invention.

Claims

1. A power supply protector for lithium cell test, its characterized in that: the power supply system comprises a singlechip U3, a rear-stage power supply switch module, a rear-stage power supply level conversion module, a front-stage power supply module and a power supply state prompting module;

2. A power supply protection device for lithium battery testing as claimed in claim 1, wherein: the rear-stage power supply switch module comprises a switch switching protector U4, a D-type trigger U5, an optocoupler U6, an optocoupler U13, a MOS tube Q2, a MOS tube Q3, a MOS tube Q6, a reset key 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;

3. A power supply protection device for lithium battery testing as claimed in claim 1, wherein: the post-stage power level conversion module comprises a DCDC chip U1, an LDO linear voltage regulator U2, an LDO linear voltage regulator U7, an LDO linear voltage regulator U8, an LDO linear voltage regulator U9, an LDO linear voltage regulator 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 C39, a capacitor C40, a capacitor C41, a capacitor C42, a capacitor C43, an inductor C44, an inductor L1, an inductor L2, an inductor R4, an inductor R1, a resistor R3, a resistor R1, a resistor and a resistor;

after the capacitor C6 and the capacitor C7 are connected in parallel, one end of the capacitor C6 is connected with the resistor R3 and pins 5, 7 and 8 of the LDO linear voltage regulator U2, and the other end of the capacitor C7 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, and the other end of the capacitor C is grounded; pins 1, 2 and 3 of the LDO linear voltage regulator U2 are connected with a capacitor C8, a capacitor C9 and an inductor L1; one end of the capacitor C10 is connected with the capacitor C8 and the capacitor C9 and grounded, and the other end of the capacitor C10 is connected with the inductor L1 and pins 9, 31, 45, 59, 80 and 94 of the singlechip U3;

after the capacitor C25 and the capacitor C26 are connected in parallel, one end of the capacitor C is connected with the resistor R99 and pins 5, 7 and 8 of the LDO linear voltage regulator U7, and the other end of the capacitor C 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 the capacitor C is grounded; pins 1, 2 and 3 of the LDO linear voltage regulator U7 are connected with a capacitor C27 and a capacitor C28; the capacitor C27 is connected with the capacitor C28 and grounded;

after the capacitor C29 and the capacitor C30 are connected in parallel, one end of the capacitor C29 is connected with the resistor R100 and pins 5, 7 and 8 of the LDO linear voltage regulator U8, and the other end of the capacitor C 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 the capacitor C is grounded; pins 1, 2 and 3 of the LDO linear voltage regulator U8 are connected with a capacitor C31 and a capacitor C32; the capacitor C31 is connected with the capacitor C32 and grounded;

after the capacitor C35 and the capacitor C36 are connected in parallel, one end of the capacitor C35 is connected with the resistor R103 and pins 5, 7 and 8 of the LDO linear voltage regulator U9, and the other end of the capacitor C36 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 the capacitor C is grounded; pins 1, 2 and 3 of the LDO linear voltage regulator U9 are connected with a capacitor C37 and a capacitor C38; the capacitor C37 is connected with the capacitor C38 and grounded;

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

4. A power supply protection device for lithium battery testing as claimed in claim 1, wherein: the pre-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;

5. A power supply protection device for lithium battery testing as claimed 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;