CN214626474U

CN214626474U - Power input protection circuit of intelligence lock

Info

Publication number: CN214626474U
Application number: CN202023226750.0U
Authority: CN
Inventors: 王建青
Original assignee: Changzhou Bonwin Technology Co ltd
Current assignee: Changzhou Bonwin Technology Co ltd
Priority date: 2020-12-28
Filing date: 2020-12-28
Publication date: 2021-11-05
Anticipated expiration: 2030-12-28

Abstract

The utility model discloses a power input protection circuit of intelligence door lock, prevent surge protection circuit and lock lithium cell charge-discharge protection circuit including power input, power input prevents surge protection circuit and comprises power input interface P1, rectifier bridge DZ, current-limiting resistor R1, condenser C1, thyristor V1, dc-to-ac converter S1, transformer T1, diode D5, diode D6, inductance L and electric capacity C2. This power input protection circuit of intelligence lock through the power input surge protection circuit and the door lock lithium cell charge-discharge protection circuit that sets up for the lithium cell can not lead to the battery to burn out because of surge current is too big in the instant charging, possesses the overcharge simultaneously, cross discharge protect function, avoids the lithium cell to avoid being harm in long-time use, and then ensures the normal use of intelligence lock.

Description

Power input protection circuit of intelligence lock

Technical Field

The utility model relates to a power protection circuit technical field specifically is a power input protection circuit of intelligence lock.

Background

With the gradual development of information technology, the gradual improvement of network technology, the increasing abundance of applicable network carriers and the gradual popularization of indoor network access strategy with large bandwidth, the intellectualization of the door lock becomes a necessary development trend. At present, intelligence lock is the power that provides by built-in lithium cell more, and in practical application, the existence leads to the battery to burn out because the lithium cell is too big at the instantaneous surge current that charges, and the lithium cell is in long-time use simultaneously, and overcharge, overdischarge can cause the harm to the lithium cell to influence the normal use of intelligence lock.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a power input protection circuit of intelligence lock, through the power input surge protection circuit AND gate lock lithium cell charge-discharge protection circuit who sets up for the lithium cell can not lead to the battery to burn out because of surge current is too big charging transient, possesses simultaneously and overcharges, overdischarge protect function, avoids the lithium cell to avoid being harmed in long-time use, and then ensures the normal use of intelligence lock, can solve the problem among the prior art.

In order to achieve the above object, the utility model provides a following technical scheme: the power input anti-surge protection circuit comprises a power input anti-surge protection circuit and a door lock lithium battery charging and discharging protection circuit, wherein the power input anti-surge protection circuit consists of a power input interface P1, a rectifier bridge DZ, a current-limiting resistor R1, a capacitor C1, a thyristor V1, an inverter S1, a transformer T1, a diode D5, a diode D6, an inductor L and a capacitor C2, wherein a pin 1 and a pin 2 of a power input interface P1 are respectively connected with a pin 1 and a pin 3 of the rectifier bridge DZ, a pin 2 of the rectifier bridge DZ is connected with the current-limiting resistor R1, a current-limiting resistor R1 is connected with a pin 4 circuit interface of the rectifier bridge DZ after being connected with the capacitor C1, a pin 4 of the rectifier bridge DZ is connected with an inverter S1, a thyristor V1 is connected with two ends of the current-limiting resistor R1 in parallel, and a primary winding of the transformer T1 is respectively connected with the thyristor V1 and the inverter S1;

the door lock lithium battery charging and discharging protection circuit is composed of a main control IC and a lithium battery BAT, wherein 2 pins of the main control IC are connected with a capacitor C4 and a resistor R5, the capacitor C4 is connected with a negative circuit interface of the lithium battery BAT, the resistor R5 is connected with a positive circuit interface of the lithium battery BAT, 4 pins and 6 pins of the main control IC are respectively connected with grids of a MOSFET Q1 and a MOSFET Q2, 5 pins of the main control IC are connected with a resistor R6, the resistor R6 is connected with an input voltage Vin-, a negative electrode of the lithium battery BAT is connected with a source electrode of the MOSFET Q2, a drain electrode of the MOSFET Q2 is connected with a drain electrode of the MOSFET Q1, two ends of the source electrode and the drain electrode of the MOSFET Q2 are connected with a diode VD2 in parallel, the source electrode of the MOSFET Q1 is connected with a circuit interface of the resistor R6, and two ends of the source electrode of the MOSFET Q1 and the drain electrode are connected with a diode VD1 in parallel.

Preferably, the secondary winding of the transformer T1 is connected to a diode D5 and an inductor L connected in series, and a diode D6 and a capacitor C2 connected in parallel, respectively, to output the voltage Vout.

Preferably, the positive electrode of the lithium battery BAT is connected to the fuse F1, and the fuse F1 is connected to the input voltage Vin +.

Preferably, the main control IC is R5421-149C in model.

Preferably, the MOSFET Q1 and the MOSFET Q2 are both S19926.

Preferably, the fuse F1 is of type VTP 210S.

Compared with the prior art, the beneficial effects of the utility model are as follows:

according to the power input protection circuit of the intelligent door lock, a 220V input power supply charges a capacitor C1 through a rectifier bridge DZ and a current-limiting resistor R1, so that surge current is limited, when the capacitor C1 is charged to reach rated voltage, an inverter V1 is in a conducting state, a primary winding of a transformer T1 generates a trigger signal of a thyristor V1, the thyristor V1 is conducted and short-circuits a current-limiting resistor R1, current is output through a secondary winding of the transformer T1, and the current is filtered and output through a diode D5, a diode D6, an inductor L and a capacitor C2.

This power input protection circuit of intelligence door lock, when charging and discharging lithium cell BAT, main control IC's 4 feet, 6 foot high level, MOSFET pipe Q1 switches on with MOSFET pipe Q2, at this moment, the charging current of input charges to lithium cell BAT through fuse F1, and from MOSFET pipe Q1 and MOSFET pipe Q2 output, because MOSFET pipe Q1 and MOSFET pipe Q2's resistance is minimum, thereby can effectively reduce the electric current and harm, and possess overcharge, overdischarge protect function.

Drawings

Fig. 1 is a circuit diagram of the power input surge protection circuit of the present invention;

fig. 2 is the utility model discloses a lock lithium cell charge-discharge protection circuit diagram.

In the figure: 1. the power input surge protection circuit; 2. door lock lithium cell protection circuit that charges and discharges.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1, a power input protection circuit of an intelligent door lock includes a power input anti-surge protection circuit 1 and a door lock lithium battery charging and discharging protection circuit 2, where the power input anti-surge protection circuit 1 is composed of a power input interface P1, a rectifier bridge DZ, a current-limiting resistor R1, a capacitor C1, a thyristor V1, an inverter S1, a transformer T1, a diode D5, a diode D6, an inductor L and a capacitor C2, where

pins

1 and 2 of the power input interface P1 are respectively connected to

pins

1 and 3 of the rectifier bridge DZ, pin 2 of the rectifier bridge DZ is connected to the current-limiting resistor R6329, and a current-limiting resistor R1 is connected to the capacitor C1 and then connected to a pin 4 of the rectifier bridge DZ, pin 4 of the rectifier bridge DZ is connected to the thyristor S1, V1 is connected in parallel to both ends of the current-limiting resistor R1, a primary winding of a transformer T5 is respectively connected to the V1 and an inverter 58s winding 24, a secondary winding of the transformer T1 is connected to the thyristor in series, and a diode 5, and a diode 599D 599 and a diode C599 are respectively connected to the diode C599 and a diode C2 in parallel And outputs the voltage Vout.

Referring to fig. 2, the door lock lithium battery charging and discharging protection circuit 2 is composed of a main control IC of R5421-149C type and a lithium battery BAT, wherein, pin 2 of the master control IC is connected with a capacitor C4 and a resistor R5, the capacitor C4 is connected with the negative circuit interface of the lithium battery BAT, the resistor R5 is connected with the positive circuit interface of the lithium battery BAT,

pins

4 and 6 of the master control IC are respectively connected with the grids of the MOSFET Q1 and the MOSFET Q2, pin 5 of the master control IC is connected with a resistor R6, meanwhile, the resistor R6 is connected with the input voltage Vin-, the anode of the lithium battery BAT is connected with the fuse F1, meanwhile, the fuse F1 is connected with the input voltage Vin +, the cathode of the lithium battery BAT is connected with the source electrode of the MOSFET tube Q2, the drain electrode of the MOSFET tube Q2 is connected with the drain electrode of the MOSFET tube Q1, meanwhile, two ends of a source electrode and a drain electrode of the MOSFET Q2 are connected with the diode VD2 in parallel, a source electrode of the MOSFET Q1 is connected with a circuit interface of the resistor R6, and two ends of a source electrode and a drain electrode of the MOSFET Q1 are connected with the diode VD1 in parallel.

According to the power input protection circuit of the intelligent door lock, a 220V input power supply charges a capacitor C1 through a rectifier bridge DZ and a current-limiting resistor R1, so that surge current is limited, when the capacitor C1 is charged to reach rated voltage, an inverter V1 is in a conducting state, a primary winding of a transformer T1 generates a trigger signal of a thyristor V1, so that the thyristor V1 is conducted and short-circuits the current-limiting resistor R1, current is output through a secondary winding of the transformer T1, and is output in a voltage-stabilizing mode through a diode D5, a diode D6, an inductor L and a capacitor C2.

In summary, the following steps: this power input protection circuit of intelligence lock, through the power input surge protection circuit 1 AND gate lock lithium cell charge-discharge protection circuit 2 that sets up for the lithium cell can not lead to the battery to burn out because of surge current is too big in the instant of charging, possesses the overcharge simultaneously, cross discharge protect function, avoids the lithium cell to avoid being harm in long-time use, and then the normal use of guarantee intelligence lock can effectively solve prior art problem.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides a power input protection circuit of intelligence lock, includes power input surge protection circuit (1) and lock lithium cell charge-discharge protection circuit (2), its characterized in that: the power input anti-surge protection circuit (1) consists of a power input interface P1, a rectifier bridge DZ, a current-limiting resistor R1, a capacitor C1, a thyristor V1, an inverter S1, a transformer T1, a diode D5, a diode D6, an inductor L and a capacitor C2, wherein a pin 1 and a pin 2 of the power input interface P1 are respectively connected with a pin 1 and a pin 3 of the rectifier bridge DZ, a pin 2 of the rectifier bridge DZ is connected with the current-limiting resistor R1, meanwhile, the current-limiting resistor R1 is connected with a pin 4 circuit interface of the rectifier bridge DZ after being connected with the capacitor C1, a pin 4 of the rectifier bridge DZ is connected with an inverter S1, the thyristor V1 is connected with two ends of the current-limiting resistor R1 in parallel, and a primary winding of the transformer T1 is respectively connected with the thyristor V1 and the inverter S1;

the door lock lithium battery charge-discharge protection circuit (2) is composed of a main control IC and a lithium battery BAT, wherein a pin 2 of the main control IC is connected with a capacitor C4 and a resistor R5, the capacitor C4 is connected with a negative circuit interface of the lithium battery BAT, the resistor R5 is connected with a positive circuit interface of the lithium battery BAT, pins 4 and 6 of the main control IC are respectively connected with grids of a MOSFET tube Q1 and a MOSFET tube Q2, a pin 5 of the main control IC is connected with a resistor R6, the resistor R6 is connected with an input voltage Vin-, a negative electrode of the lithium battery BAT is connected with a source electrode of the MOSFET tube Q2, a drain electrode of the MOSFET tube Q2 is connected with a drain electrode of the MOSFET tube Q1, the source electrode and two ends of the MOSFET tube Q2 are connected with a diode VD2 in parallel, the source electrode of the MOSFET tube Q1 is connected with a circuit interface of the resistor R6, and the source electrode and the two ends of the MOSFET tube Q1 are connected with a diode VD1 in parallel.

2. The power input protection circuit of an intelligent door lock as claimed in claim 1, wherein: the secondary winding of the transformer T1 is connected with a diode D5 and an inductor L which are connected in series, and a diode D6 and a capacitor C2 which are connected in parallel, and then voltage Vout is output.

3. The power input protection circuit of an intelligent door lock as claimed in claim 1, wherein: the positive pole of lithium cell BAT is connected with fuse P1, and fuse P1 is connected with input voltage Vin +.

4. The power input protection circuit of an intelligent door lock as claimed in claim 1, wherein: the model number of the main control IC is R5421-149C.

5. The power input protection circuit of an intelligent door lock as claimed in claim 1, wherein: the model numbers of the MOSFET Q1 and the MOSFET Q2 are S19926.

6. The power input protection circuit of an intelligent door lock as claimed in claim 3, wherein: the type of the fuse P1 is VTP 210S.