CN218850625U

CN218850625U - Power supply protection device for lithium battery test

Info

Publication number: CN218850625U
Application number: CN202223415672.8U
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: 2023-04-11
Anticipated expiration: 2032-12-20

Abstract

The utility model provides a power supply protection device for lithium battery test, which belongs to the technical field of protection of lithium battery test equipment, and comprises a singlechip U3, a rear power supply switch module, a rear power level conversion module, a front power supply module and a power supply state prompt module; the rear-stage power supply switch module is respectively connected with the single chip microcomputer U3, the rear-stage power level conversion module, the front-stage power supply module and the power supply state prompt module; and the rear-stage power supply level conversion module is connected with the singlechip U3. The utility model has the advantages of: the stability of power supply test equipment operation has greatly been promoted.

Description

Power supply protection device for lithium battery test

Technical Field

The utility model relates to a lithium cell test equipment protection technical field indicates a power supply protector for lithium cell test very much.

Background

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

In order to enable the lithium battery testing equipment to stably operate under different operating conditions, the stability of power supply of the lithium battery testing equipment in the initial power supply process needs to be ensured, and the lithium battery testing equipment is not influenced by a switch before the initialization state of the whole system is completed.

However, the conventional lithium battery testing device is only designed by simply adding a mechanical switch to perform a power switch, and a power supply in the power-on process is lost continuously, that is, in the power-on process of the lithium battery testing device, a power supply is easily influenced by mechanical jitter generated in the switching process of the mechanical switch, and is easily influenced by power supply impact caused by mistaken touch in switching of the power switch, so that the stability of the power supply testing device is influenced.

Therefore, how to provide a power supply protection device for lithium battery testing, the stability of the operation of the power supply testing equipment is improved, and a technical problem to be solved urgently is formed.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model lies in providing a power supply protector for lithium cell test, realizes promoting the stability of power testing equipment operation.

The utility model discloses a realize like this: a power supply protection device for lithium battery testing comprises a single chip microcomputer U3, a rear-stage power supply switch module, a rear-stage power 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 single chip microcomputer U3, the rear-stage power level conversion module, the front-stage power supply module and the power supply state prompt module; and the rear-stage power supply level conversion module is connected with the singlechip U3.

Further, the rear-stage power supply switch module comprises a switch switching protector U4, a D-type trigger U5, an optocoupler U6, an optocoupler U13, an MOS tube Q2, an MOS tube Q3, an 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;

a pin 2 of the switch switching protector U4 is connected with a reset key K1, a pin 3 is connected with a pin 2 of a D-type trigger U5, and the pin 4 is connected with a preceding-stage power supply module; one end of the resistor R50 is connected with the power supply module of the front-stage power supply, and the other end of the resistor R50 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; pin 4 of the D-type trigger U5 is connected with a resistor R68, and pin 5 is connected with a preceding 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 of the MOS tube Q2 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 rear-stage power supply level conversion module;

the C pole of the optocoupler U13 is connected with the reset key 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 optocoupler U6, and the A pole is connected with the resistor R67, the output end of the diode D12 and the C pole of the optocoupler U6; the resistor R67 is connected with a preceding 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 rear-stage power supply level conversion module;

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

Further, the air conditioner is characterized in that, 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 C2, a capacitor C3, a capacitor C2, 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 C3, a 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 R3, a resistor R99, a resistor R100, a resistor R103, a resistor R104, and a resistor R106;

after the capacitor C2 and the capacitor C3 are connected in parallel, one end of the capacitor C is connected with a pin 1 of the transformer L3, and the other end of the capacitor C is connected with a pin 4 of the transformer L3 and a rear-stage power supply switch module; after the capacitor C4 and the capacitor C5 are connected in parallel, one end of the capacitor C4 is connected with a pin 2 of the transformer L3 and a pin 1 of the DCDC chip U1, and the other end of the capacitor C5 is connected with a pin 3 of the transformer L3 and a pin 2 of the DCDC chip U1; a pin 5 of the DCDC chip U1 is connected with a capacitor C24, a resistor R1 and an inductor L7, a pin 6 is connected with the capacitor C1 and the capacitor C24 and is grounded, and a 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 a 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 is 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 the

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 a 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 all 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 C 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 the capacitor C is grounded; the resistor R100 is connected with the inductor L5; one end of the capacitor C34 is connected with a 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 regulator U8 are all 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 C 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 the capacitor C is grounded; the resistor R103 is connected with the inductor L6; one end of the capacitor C43 is connected with a 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 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 and the pin 6 of the LDO linear voltage regulator U10 are connected and grounded; the resistor R104 is connected with the inductor L7; pin 4 of the LDO linear regulator U10 is connected to a capacitor C44 and a resistor R106; after the capacitor C41 and the capacitor C42 are connected in parallel, one end of the capacitor C is connected with the

pins

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

Further, the preceding 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 connected in parallel, one end of the capacitor C is connected with the output end of the diode D8 and the rear-stage power supply switch module, and the other end of the capacitor C is grounded;

after 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.

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 transistor 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 D6 is connected with the drain electrode of the MOS transistor Q1; and the source electrode of the MOS tube Q1 is connected with the rear-stage power supply switch module.

The utility model has the advantages of:

the single chip microcomputer U3, a rear-stage power supply switch module, a rear-stage power level conversion module, a front-stage power supply module and a power supply state prompt module are arranged; the front-stage power supply module stabilizes input voltage through the 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 sudden power failure or power supply impact generated by transient switching by arranging 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 rear-stage power supply switch module eliminates the influence caused by the shake of the reset key K1 through a switch switching protector U4; outputting a control level of a power-on time sequence through a post-stage power level conversion module; the current working state of the protection device is indicated through the power supply state prompt module, namely, the rear-stage power supply switch module is controlled to work through the single chip microcomputer U3, so that the rear-stage power supply switch module is controlled to be powered on according to a preset power-on time sequence before the system of the power supply test equipment is initialized, and after the system is initialized, the rear-stage power supply switch module is used for powering on the rear-stage system of the power supply test equipment, and finally, the running stability of the power supply test equipment is greatly improved.

Drawings

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

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

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

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

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

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

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

Detailed Description

The technical scheme in the embodiment of the application has the following general idea: the single chip microcomputer U3 controls a rear-stage power supply to be powered on according to a preset power-on time sequence through a rear-stage power supply switch module and a rear-stage power supply level conversion module, after the system is initialized, the rear-stage system of the power supply testing equipment is powered on, a front-stage power supply module stabilizes input voltage through series connection of a resistor R29 and a voltage stabilizing diode D4, the power supply is prevented from being reversely connected through a series connection diode D8, sudden power failure or power supply impact caused by transient switches is avoided by arranging a plurality of capacitors, and the influence caused by shaking of a reset key K1 is eliminated by arranging a switch switching protector U4 so as to improve the running stability of the power supply testing equipment.

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

the single chip microcomputer U3 is used for controlling the work of the protection device, and the type is preferably EPM240T100C5NTQFP-100; the rear-stage power supply switch module is used for controlling a power supply 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 a rear-stage system; the front-stage power supply module is used for accessing a power supply and supplying power to a rear-stage system; the power supply state prompting module is used for indicating the current working state of the protection device, namely indicating whether a 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, an MOS tube Q2, an MOS tube Q3, an 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, and the switch switching protector U4 is used for eliminating mechanical jitter generated by the reset key K1; the D-type flip-flop U5 is a single-path positive edge triggered D-type flip-flop, and the type is preferably SN74LVC1G79; the models of the optocouplers U6 and U13 are preferably TLP291;

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

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 C7, 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 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 R3, a resistor R99, a resistor R100, a resistor R103, a resistor R104, and a resistor R106; the model of the DCDC chip U1 is preferably G2409S-2WR2, and the DCDC chip U1 has the function of configuring power-on time; the model of the LDO linear voltage regulator U2 is preferably ADP7118ARDZ-3.3-R7; the model of the LDO linear voltage regulator U7, the LDO linear voltage regulator U8 and the LDO linear voltage regulator U9 is preferably ADP7118ARDZ-5.0-R7; the model of the LDO linear voltage regulator U10 is preferably ADP7182ACPZ-5.0-R7;

after the capacitor C2 and the capacitor C3 are connected in parallel, one end of the capacitor C2 is connected with a pin 1 of the transformer L3, and the other end of the capacitor C3 is connected with a pin 4 of the transformer L3 and a rear-stage power supply switch module; after the capacitor C4 and the capacitor C5 are connected in parallel, one end of the capacitor C4 is connected with a pin 2 of the transformer L3 and a pin 1 of the DCDC chip U1, and the other end of the capacitor C5 is connected with a pin 3 of the transformer L3 and a pin 2 of the DCDC chip U1; a pin 5 of the DCDC chip U1 is connected with a capacitor C24, a resistor R1 and an inductor L7, a pin 6 is connected with the capacitor C1 and the capacitor C24 and is grounded, and a 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 C 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 C is grounded; the resistor R3 is connected with the inductor L10; one end of the capacitor C18 is connected with a pin 6 of the LDO linear voltage regulator U2, and the other end of the capacitor C is grounded;

pins

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

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 a pin 6 of the LDO linear voltage regulator U7, and the other end of the capacitor C33 is grounded;

pins

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

pins

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

pins

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

pins

The preceding 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;

The power supply state prompting module comprises a resistor R42, a resistor R43, a light-emitting diode D5, a light-emitting diode D6 and an MOS (metal oxide semiconductor) transistor Q1; the MOS tube Q1, the MOS tube Q2, the MOS tube Q3 and the MOS tube Q6 are NMOS tubes, and the type is preferably NCE2312;

The utility model discloses theory of operation:

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

when the rear-stage power supply switch module is in a closed state, the reset key K1 does not form a pressing and releasing action, the pin 3 of the switch switching protector U4 continuously outputs a high level, at this time, the pin 2 of the D-type flip-flop U5 does not recognize 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, the level signal performs corresponding control action on the MOS transistor Q2 and the MOS transistor Q3 through the resistor R68 and the resistor R58, and the network number PCON _2 is a low level signal, so the MOS transistor Q2 and the MOS transistor Q3 are in a cut-off state, and at this time, the light-emitting diode D5 does not emit light. Through increasing electric capacity C15 and electric capacity C16 between MOS pipe Q2 and MOS pipe Q3's grid and source electrode and come to act on with resistance R68 and resistance R58 for the switching action that forms under the conversion of the high-low level of MOS pipe Q2 and MOS pipe Q3's control signal reaches the effect of slowly starting, avoids transient state switch to the power supply of back level to produce impact influence. 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 at this time, the signal is transmitted to the pin 1 of the D-type flip-flop U5 and the gate of the MOS transistor Q1, the MOS transistor Q1 enters the saturation state in the high level state of the PCON _3, the drain and the source of the MOS transistor Q1 are in the conduction state, and when the MOS transistor Q1 enters the saturation state, the light emitting diode D6 lights up to indicate that the system is in the standby state at this time. Because the rear-stage POWER supply switch module of the system is in a closed state at this time, because the control pin FRONT _ POWER _ SET of the single chip microcomputer U3 is in an input state when not configured and not powered on, the level of the network number FRONT _ POWER _ SET is raised to the level of V + under the action of pulling up the resistor R97 at this time, and because the rear-stage POWER supply of the system is not powered on, the V + does not output a corresponding high level, so the MOS transistor Q6 is still in a cut-off state at this time, the C pole and the E pole of the optocoupler U6 are in a cut-off state, and the level state of the network number PCON _7 is not affected, therefore, by selecting corresponding parameters of the resistor R67, the optocoupler U13 supplies current 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 a saturated conduction state. Therefore, when the rear-stage power supply switch module is in a closed state, the system prompts a working state through the light emitting diode D6, and 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 key K1 can be enabled to 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 switched to an on state:

the reset key K1 is pressed and released once, because the pole C and the pole E of the optocoupler U13 are in a saturated conduction state at the moment, the operation action of the reset key K1 can be effectively transmitted 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 corresponding time delay to carry out jitter elimination processing by judging the operation time of the reset key K1, if 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 can be switched from the high level to the low level when the reset key K1 is pressed, and then switched from the low level to the high level when the reset key K1 is released, and further provides a CLK edge switching signal for the pin 2 of the D-type trigger U5, at this time, a rising edge signal is recognized by the pin 2 of the D-type flip-flop U5, because 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 a 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, because 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, because the drain and the source of the MOS transistor Q3 are in a conduction state, the network number-VO is communicated with GND-P at this time, the light emitting diode D5 is lit, and the DCDC chip U1 in the rear-stage power level conversion module starts to enter a power-up working state. Since the drain and the source of the MOS transistor Q2 are in a conducting 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 respectively transmitted to the pin 1 of the D-type flip-flop U5 and the gate of the MOS transistor Q1. Under the low level state of PCON _3, the MOS transistor Q1 will enter the cut-off state, and when the MOS transistor Q1 enters the cut-off state, the drain electrode and the source electrode are not conducted, and the light-emitting diode D6 is not lighted. At this time, the rear-stage POWER supply switch module 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 a control pin FRONT _ POWER _ SET of the single chip U3 is in an input state when a program is not configured, at this time, a network number FRONT _ POWER _ SET can raise a level to a level where V + is located under the action of a resistor R97, because a rear-stage POWER supply of the system is already in a POWER-on state, and V + forms a high level relative to GND, so that V + outputs a corresponding high level under the voltage division action of the resistor R97 and the resistor R110, so that the MOS transistor Q6 enters a saturated conduction state, at this time, a drain and a source of the MOS transistor Q6 are in a conduction state, and the PCON _5 is in a low level state, and an output of the optical coupler U6 is under the action of output levels of the resistors R96 and V +, so that a C pole and E pole of the optical coupler U6 are in a conduction state, and further pull down the level of the network number PCON _7 to a low level state. The A utmost point of opto-coupler U13 and the loop of the K utmost point obtain not corresponding electric current this moment, so the C utmost point and the E utmost point of opto-coupler U13 are in the off-state, and the one side of resetting button K1 for saying so fails to insert the low level signal effectively, so the operation of resetting button K1 this moment can get into failure mode, and the operation on resetting button K1 can not influence the level of switch switching protector U4's pin 2, the switch action of uncontrollable power.

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

pins 5, 6 and 7 of the DCDC chip U1 stably output corresponding levels, the LDO linear regulator U2 controls the power-on time of the output voltage of the VOUT pin by configuring the capacitance value of a capacitor C18 butted with the pin 6, the LDO linear regulator U7, the LDO linear regulator U8 and the LDO linear regulator U9 respectively control the power-on time of the output voltage of the corresponding VOUT pin by the capacitance value butted with the respective pin 6, and the LDO linear regulator 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. The user can configure the corresponding power-on time according to the subsequently used chip to meet the power-on time sequence requirement of the selected chip.

When the power supply voltage of the whole system reaches the set condition, the single chip microcomputer 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 single chip microcomputer U3, the MOS tube Q6 enters a cut-off state, and the A pole and the K pole of the optical coupler U6 cannot flow in required current, so that the C pole and the E pole of the optical coupler 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 optical coupler U6 at the moment, and the A pole and the K pole of the optical coupler U13 can be driven by the current of the voltage network number +24V-P and the resistor R67 to enable the C pole and the E pole to enter the conduction state. And 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 key K1 can be switched to the high/low state effectively at the pin 2 of the switching protector U4 in the next click operation. Therefore, after the system is powered on, the operation control of the reset key K1 is effective only after the initialization of the single chip microcomputer U3 is completed, so that the influence of the power switch on the power test equipment before the initialization is completed is guaranteed, the stability and the function of the power test equipment are prevented from being damaged in the power-on process, and the protection effect of the lithium battery test equipment in the switching process of the power supply power switch is achieved.

To sum up, the utility model has the advantages that:

the system is characterized in that a single chip microcomputer U3, a rear-stage power supply switch module, a rear-stage power level conversion module, a front-stage power supply module and a power supply state prompt module are arranged; the front-stage power supply module stabilizes input voltage through the 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 sudden power failure or power supply impact generated by transient switching by arranging 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 rear-stage power supply switch module eliminates the influence caused by the shake of the reset key K1 through a switch switching protector U4; outputting a control level of a power-on time sequence through a post-stage power level conversion module; the current working state of the protection device is indicated through the power supply state prompt module, namely, the rear-stage power supply switch module is controlled to work through the single chip microcomputer U3, so that the rear-stage power supply switch module is controlled to be powered on according to a preset power-on time sequence before the system of the power supply test equipment is initialized, and after the system is initialized, the rear-stage power supply switch module is used for powering on the rear-stage system of the power supply test equipment, and finally, the running stability of the power supply test equipment is greatly improved.

Although specific embodiments of the present invention have been described, it will be understood by those skilled in the art that the specific embodiments described are illustrative only and are not limiting upon the scope of the invention, and that equivalent modifications and variations can be made by those skilled in the art without departing from the spirit of the invention, which is to be limited only by the claims appended hereto.

Claims

1. The utility model provides a power supply protector for lithium cell test which characterized in that: the power supply system comprises a singlechip U3, a rear-stage power supply switch module, a rear-stage power 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 single chip microcomputer U3, the rear-stage power supply level conversion module, the front-stage power supply module and the power supply state prompt module; and the rear-stage power supply level conversion module is connected with the singlechip U3.

2. A power supply protection device for lithium battery testing as claimed in claim 1, characterized in that: the rear-stage power supply switch module comprises a switch switching protector U4, a D-type trigger U5, an optocoupler U6, an optocoupler U13, an MOS tube Q2, an MOS tube Q3, an 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, characterized in that: 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 C2, a capacitor C3, a capacitor C2, 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 C3, a 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 R3, a resistor R99, a resistor R100, a resistor R103, a resistor R104, and a resistor R106;

after the capacitor C2 and the capacitor C3 are connected in parallel, one end of the capacitor C is connected with a pin 1 of the transformer L3, and the other end of the capacitor C is connected with a pin 4 of the transformer L3 and a rear-stage power supply switch module; after the capacitor C4 and the capacitor C5 are connected in parallel, one end of the capacitor C4 is connected with a pin 2 of the transformer L3 and a pin 1 of the DCDC chip U1, and the other end of the capacitor C5 is connected with a pin 3 of the transformer L3 and a pin 2 of the DCDC chip U1; a pin 5 of the DCDC chip U1 is connected with a capacitor C24, a resistor R1 and an inductor L7, a pin 6 is connected with the capacitor C1 and the capacitor C24 and is grounded, and a pin 7 is connected with the capacitor C1, the inductor L2, an inductor L4, an inductor L5 and an 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 a 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 is 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 the 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 a pin 6 of the LDO linear voltage regulator U7, and the other end of the capacitor C33 is grounded; pins 1, 2 and 3 of the LDO linear 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 C 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 the capacitor C is grounded; the resistor R100 is connected with the inductor L5; one end of the capacitor C34 is connected with a 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 regulator U8 are connected with a capacitor C31 and a capacitor C32; the capacitor C31 is connected with the capacitor C32 and is grounded;

after the capacitor C35 and the capacitor C36 are connected in parallel, one end of the capacitor C 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 the capacitor C is grounded; the resistor R103 is connected with the inductor L6; one end of the capacitor C43 is connected with a 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 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 C is connected with a pin 6 of the LDO linear voltage regulator U10 and is grounded; the resistor R104 is connected with the inductor L7; pin 4 of the LDO linear regulator U10 is connected to a capacitor C44 and a resistor R106; after the capacitor C41 and the capacitor C42 are connected in parallel, one end of the capacitor C is connected with the pins 1 and 2 of the LDO linear voltage regulator U10, and the other end of the capacitor C is grounded.

4. A power supply protection device for lithium battery testing as claimed in claim 1, characterized in that: the preceding 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, characterized in that: the power supply state prompting module comprises a resistor R42, a resistor R43, a light emitting diode D5, a light emitting diode D6 and an MOS tube Q1;