CN211239399U

CN211239399U - Improved mobile power supply circuit for hand warmer

Info

Publication number: CN211239399U
Application number: CN201922502406.0U
Authority: CN
Inventors: 白晓波
Original assignee: Shenzhen Hongnanke Communication Equipment Co ltd
Current assignee: Shenzhen Hongnanke Communication Equipment Co ltd
Priority date: 2019-12-31
Filing date: 2019-12-31
Publication date: 2020-08-11
Anticipated expiration: 2029-12-31

Abstract

The utility model discloses an improved generation hand warmer portable power source circuit, including power input module, charging protection module, electric core module, charging protection module includes charge management unit, electric core protection unit, power input module and charge management unit, electric core protection unit, and electric core module be electric connection in proper order, still include respectively with charge management unit and electric core protection unit electric connection's main control IC module, with main control IC module electric connection's MCU processing module, respectively with MCU processing module electric connection's USB output module and the output module that generates heat; the heating output module is also electrically connected with the USB output module. The utility model discloses a master control IC module and MCU processing module mutually support, can realize USB output module or the output module independent work that generates heat, and then can effectively avoid master control IC module's overload work, and the security is high, keep warm effectual, the practicality is strong.

Description

Improved mobile power supply circuit for hand warmer

Technical Field

The utility model relates to a hand warmer portable power source technical field especially relates to a hand warmer portable power source circuit of improved generation.

Background

In winter, hands become cold outdoors or in some places without heating equipment, so various portable warm-keeping equipment appears on the market, and most commonly used hand warmers are mobile power supplies. However, the mobile power supply for the hand warmer on the market has the following defects:

1) the circuit design is complex, and the functions of charging electronic equipment (mobile phone) and heating and warming hands can be simultaneously used, so that the product has low energy efficiency (the master control IC is overloaded, the temperature value is increased, and the product is easy to damage) and short warming time;

2) the volume is large, the carrying is not easy, the constant temperature effect is poor, the safety performance is low, the damage is easy, and the product experience effect is poor.

In conclusion, the portable power source for the hand warmer has the problem of inconvenience in practice, so that improvement is needed.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a warm hand of improved generation is precious portable power source circuit, this circuit reasonable in design, principle are succinct, through mutually supporting of master control IC module and MCU processing module, can realize USB output module or the output module autonomous working that generates heat, and then can effectively avoid the overload work of master control IC module, and the security is high to can improve life, and work efficiency is high, it is effectual to keep warm, the practicality is strong.

In order to realize the purpose, the following technical scheme is adopted:

an improved hand warmer mobile power supply circuit comprises a power input module, a charging protection module and a battery cell module, wherein the charging protection module comprises a charging management unit and a battery cell protection unit, the power input module is electrically connected with the charging management unit, the battery cell protection unit and the battery cell module in sequence, the improved hand warmer mobile power supply circuit also comprises a main control IC module, an MCU processing module, a USB output module and a heating output module, the main control IC module is electrically connected with the charging management unit and the battery cell protection unit respectively, the MCU processing module is electrically connected with the main control IC module, and the USB output module and the heating output module are electrically connected with the MCU processing module; the heating output module is electrically connected with the USB output module, and the MCU processing module is used for being matched with the main control IC module to control the USB output module or the heating output module to work independently.

Further, the master control IC module includes a synchronous boost chip U3, and the USB output module includes a PMOS switching tube Q1, a voltage dividing resistor R6, and a USB output unit; the source electrode of the PMOS switching tube Q1 is connected with the VOUT pin of the synchronous boost chip U3, the drain electrode of the PMOS switching tube Q1 is connected with the USB output unit, and the grid electrode of the PMOS switching tube is grounded through a voltage dividing resistor R6.

Further, the MCU processing module comprises a processing chip U5, and the heating output module comprises a PMOS (P-channel metal oxide semiconductor) switching tube Q2, an NMOS (N-channel metal oxide semiconductor) switching tube N1, a voltage division resistor R15, a voltage division resistor R12 and a heating wire; the source electrode of the PMOS switching tube Q2 is connected with a VOUT pin of a synchronous boosting chip U3, the drain electrode of the PMOS switching tube Q2 is grounded through a heating wire, and the grid electrode of the PMOS switching tube Q2 is connected with the source electrode of an NMOS switching tube N1; the drain electrode of the NMOS switch tube N1 is grounded, and the grid electrode of the NMOS switch tube N1 is connected with the PWM pin of the processing chip U5; the grid electrode of the NMOS switch tube N1 is grounded through a voltage division resistor R15, one end of a voltage division resistor R12 is connected to the common connection end of the PMOS switch tube Q2 and the NMOS switch tube N1, and the other end of the voltage division resistor R12 is connected to the common connection end of the source electrode of the PMOS switch tube Q2 and the VOUT pin of the synchronous boosting chip U3.

Further, the charging protection module comprises a lithium battery protection chip U2, and the chip model of the lithium battery protection chip U2 is XB7608 AF.

Further, the chip model of the synchronous boost chip U3 is IP 5306.

Adopt above-mentioned scheme, the beneficial effects of the utility model are that:

reasonable in design, the principle is succinct, through mutually supporting of master control IC module and MCU processing module, can realize USB output module or the output module independent work that generates heat, and then can effectively avoid master control IC module's overload work, the security is high to can improve life, and work efficiency is high, it is effectual, the practicality is strong to keep warm.

Drawings

FIG. 1 is a schematic block diagram of the present invention;

fig. 2 is a schematic circuit diagram of the main control IC module and the USB output module of the present invention;

FIG. 3 is a schematic circuit diagram of the MCU processing module of the present invention;

fig. 4 is a schematic circuit diagram of the heating output module of the present invention;

fig. 5 is a schematic circuit diagram of the charging protection module of the present invention;

wherein the figures identify the description:

1-power input module; 2, a charging protection module;

3, a battery cell module; 4-master control IC module;

5, an MCU processing module; 6-USB output module;

7, a heating output module; 21-a charge management unit;

22-a cell protection unit; 61-USB output unit.

Detailed Description

The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

Referring to fig. 1 to 5, the utility model provides an improved generation hand warmer portable power source circuit, including power input module 1, charge protection module 2, electric core module 3, charge protection module 2 includes charge management unit 21, electric core protection unit 22, power input module 1 in proper order with charge management unit 21, electric core protection unit 22, and electric core module 3 electric connection, still include respectively with charge management unit 21 and electric core protection unit 22 electric connection's master control IC module 4, with master control IC module 4 electric connection's MCU processing module 5, respectively with MCU processing module 5 electric connection's USB output module 6 and the output module 7 that generates heat; the heating output module 7 is also electrically connected with the USB output module 6, and the MCU processing module 5 is used for being matched with the main control IC module 4 to control the USB output module 6 or the heating output module 7 to work independently.

The master control IC module 4 includes a synchronous boost chip U3, and the USB output module 6 includes a PMOS switch transistor Q1, a voltage dividing resistor R6, and a USB output unit 61; the source electrode of the PMOS switching tube Q1 is connected with a VOUT pin of a synchronous boosting chip U3, the drain electrode of the PMOS switching tube Q1 is connected with the USB output unit 61, and the grid electrode of the PMOS switching tube is grounded through a voltage dividing resistor R6; the MCU processing module 5 comprises a processing chip U5, and the heating output module 7 comprises a PMOS (P-channel metal oxide semiconductor) switching tube Q2, an NMOS (N-channel metal oxide semiconductor) switching tube N1, a voltage division resistor R15, a voltage division resistor R12 and a heating wire; the source electrode of the PMOS switching tube Q2 is connected with a VOUT pin of a synchronous boosting chip U3, the drain electrode of the PMOS switching tube Q2 is grounded through a heating wire, and the grid electrode of the PMOS switching tube Q2 is connected with the source electrode of an NMOS switching tube N1; the drain electrode of the NMOS switch tube N1 is grounded, and the grid electrode of the NMOS switch tube N1 is connected with the PWM pin of the processing chip U5; the grid electrode of the NMOS switch tube N1 is grounded through a voltage division resistor R15, one end of a voltage division resistor R12 is connected to the common connecting end of the PMOS switch tube Q2 and the NMOS switch tube N1, and the other end of the voltage division resistor R12 is connected to the common connecting end of the source electrode of the PMOS switch tube Q2 and the VOUT pin of the synchronous boosting chip U3; the charging protection module 2 comprises a lithium battery protection chip U2, and the chip model is XB7608 AF; the chip model of the synchronous boost chip U3 is IP 5306.

The utility model discloses the theory of operation:

as shown in fig. 1, the master IC module 4 controls the operations of the respective modules; the power input module 1 is used for power supply (a mobile power supply 5V, 2.1A and the like) access, after the power supply is accessed, the battery cell module 3 is charged through the charging protection module 2, the battery cell protection unit 22 of the charging protection module 2 can detect the current and voltage flowing through the battery cell module 3 and detect whether overcurrent or overvoltage conditions exist, once overcurrent or overvoltage occurs, the battery cell protection unit 22 feeds back signals to the main control IC module 4, and the main control IC module 4 stops current charging and discharging through the charging management unit 21 so as to protect the battery cell module 3 and has high safety; the battery cell module 3 charges electronic equipment connected to the USB output module 6 through the battery cell protection unit 22, the main control IC module 4 and the MCU processing module 5; the heating output module 7 comprises a heating wire (resistance wire and the like), and can convert the electric energy transmitted by the battery cell module 3 into heat energy and emit the heat energy, so that a user can warm hands; when a user warms hands by using the hand warmer mobile power supply, the master control IC module 4 and the MCU processing module 5 are matched with each other to control the heating output module 7 to work, and the USB output module 6 is stopped to work, so that a single hand warming function is realized, overload work of the master control IC module 4 is avoided, and the service life is prolonged; in addition, the master control IC module 4 and the MCU module are mutually matched to realize the independent work of the USB output module 6, so that the single charging function is realized, and the phenomenon that the load of the synchronous boosting chip U3 of the master control IC module 4 is too large, so that the temperature is increased and the performance is reduced is avoided.

Specifically, the working principle of the charging function is as follows:

as shown in fig. 2-4, when the USB output module 6 is connected to a load (for charging an electronic device), the source of the PMOS switch Q1 receives the 5V level output by the 8 th pin (VOUT pin) of the synchronous boost chip U3, the gate of the PMOS switch Q1 is turned on at a low level through the voltage-dividing resistor R6, and the PMOS switch Q1 meets the on-state condition, and the drain of the PMOS switch Q1 outputs a current to the USB output unit 61, thereby completing a power supply loop of the USB output module 6 and realizing charging the load.

The working principle of the hand warming function is as follows:

with continued reference to fig. 2-4, when the 8 th pin (PWM pin) of the MCU processing module 5 outputs a low level, it provides a low level for the gate of the NMOS switch transistor N1, and the source of the NMOS switch transistor N1 provides an output high level from the gate of the PMOS switch transistor Q2 and the voltage dividing resistor R12, so that the on-state condition of the NMOS switch transistor N1 is satisfied, and the NMOS switch transistor N1 will be in a working state; since the NMOS switch tube N1 is in the on mode, the PMOS switch tube Q2 operates synchronously, and the drain of the PMOS switch tube Q2 is connected to the heater (as the heater power supply port), the working circuit for supplying power to the heater is turned on, and the gate level of the PMOS switch tube Q1 is pulled down at this time, and the PMOS switch tube Q1 stops operating, so that the power supply of the USB output module 6 is cut off, and the charging function is turned off.

The utility model discloses circuit design is simple, and the performance that switches on and end of make full use of MOS switch tube has realized the simplification mode (charging or warm hand), reduces the chip U3 load that steps up in step, guarantees its best work efficiency, security height, practicality are strong.

The above description is only exemplary of the present invention and should not be construed as limiting the present invention, and any modifications, equivalents and improvements made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.

Claims

1. An improved hand warmer mobile power supply circuit comprises a power input module, a charging protection module and a battery cell module, wherein the charging protection module comprises a charging management unit and a battery cell protection unit, and the power input module is electrically connected with the charging management unit, the battery cell protection unit and the battery cell module in sequence; the heating output module is electrically connected with the USB output module, and the MCU processing module is used for being matched with the main control IC module to control the USB output module or the heating output module to work independently.

2. The improved hand warmer mobile power supply circuit as claimed in claim 1, wherein the master control IC module comprises a synchronous boost chip U3, and the USB output module comprises a PMOS switch Q1, a voltage dividing resistor R6, and a USB output unit; the source electrode of the PMOS switching tube Q1 is connected with the VOUT pin of the synchronous boost chip U3, the drain electrode of the PMOS switching tube Q1 is connected with the USB output unit, and the grid electrode of the PMOS switching tube is grounded through a voltage dividing resistor R6.

3. The improved hand warmer mobile power supply circuit according to claim 2, wherein the MCU processing module comprises a processing chip U5, and the heating output module comprises a PMOS switch tube Q2, an NMOS switch tube N1, a voltage dividing resistor R15, a voltage dividing resistor R12 and a heating wire; the source electrode of the PMOS switching tube Q2 is connected with a VOUT pin of a synchronous boosting chip U3, the drain electrode of the PMOS switching tube Q2 is grounded through a heating wire, and the grid electrode of the PMOS switching tube Q2 is connected with the source electrode of an NMOS switching tube N1; the drain electrode of the NMOS switch tube N1 is grounded, and the grid electrode of the NMOS switch tube N1 is connected with the PWM pin of the processing chip U5; the grid electrode of the NMOS switch tube N1 is grounded through a voltage division resistor R15, one end of a voltage division resistor R12 is connected to the common connection end of the PMOS switch tube Q2 and the NMOS switch tube N1, and the other end of the voltage division resistor R12 is connected to the common connection end of the source electrode of the PMOS switch tube Q2 and the VOUT pin of the synchronous boosting chip U3.

4. The improved hand warmer power supply circuit as claimed in claim 1, wherein the charging protection module comprises a lithium battery protection chip U2, the chip model of which is XB7608 AF.

5. The improved hand warmer mobile power supply circuit as claimed in claim 2, wherein the chip model of the synchronous boost chip U3 is IP 5306.