CN215221826U

CN215221826U - Double-set power circuit with self-locking function

Info

Publication number: CN215221826U
Application number: CN202120314851.9U
Authority: CN
Inventors: 黄凤梅
Original assignee: Shenzhen Keyi Design Services Co ltd
Current assignee: Zhongshan Chenghao Electronics Co ltd
Priority date: 2021-02-03
Filing date: 2021-02-03
Publication date: 2021-12-17
Anticipated expiration: 2031-02-03

Abstract

The utility model discloses a double-set power circuit with self-locking function, including first power supply unit, second power supply unit, charging unit, self-locking circuit and lithium cell, the lithium cell is connected first power supply unit, second power supply unit and self-locking circuit, the 5V _ USB power of adapter is connected to the input port of charging unit, the output of charging unit is connected the lithium cell, the IO port of singlechip is connected to the self-locking circuit; the utility model discloses a set up first electrical unit and second electrical unit, realize two sets of mains operated, satisfy most mains operated system's demand, through setting up self-locking circuit, avoided mechanical type's self-locking control, the conversion rate of difficult wearing and tearing is fast, has good market using value.

Description

Double-set power circuit with self-locking function

Technical Field

The utility model relates to a power field, concretely relates to double-set power supply circuit with self-locking function.

Background

A latching circuit is one type of circuit that automatically remains energized once a switch is depressed until the other switch is depressed to open the circuit. In a normal circuit, a switch is pressed down, and the circuit is electrified; the switch is released and the circuit is opened.

The self-locking switch is widely used on electric appliances, is generally mechanical, and has the following defects: the power supply system is large in size, easy to wear, large in touch force and low in conversion speed, is mostly one set of power supply system in the existing power supply system, is not provided with a self-locking circuit, and is mostly a mechanical self-locking circuit even if the self-locking circuit is arranged.

The prior art has defects and needs to be improved.

SUMMERY OF THE UTILITY MODEL

For solving the deficiencies existing in the prior art, the utility model provides a double-set power circuit with self-locking function.

The technical scheme of the utility model is that:

the utility model provides a two sets of power supply circuit with self-locking function, including first electrical unit, second electrical unit, the battery charging unit, self-locking circuit and lithium cell, the lithium cell is connected first electrical unit, second electrical unit and self-locking circuit, the 5V _ USB power of the input port connection adapter of battery charging unit, the output of battery charging unit is connected the lithium cell, the IO port of self-locking circuit connection singlechip.

Preferably, the self-locking circuit includes switch K6, resistance R26 and resistance R27, the positive pole of lithium cell is connected to switch K6's one end, and the other end passes through resistance R26 ground connection, and the IO port of singlechip is connected to the other end, and the other end passes through resistance R27 and connects the IO port of singlechip.

Preferably, the first power supply unit comprises an integrated chip U9, the lithium battery is connected to the input end of the integrated chip U9, the output end of the integrated chip U9 outputs a 5V power supply, the first power supply unit is used for converting a 4.2V power supply of the lithium battery into an output 5V power supply, the second power supply unit comprises an integrated chip U7, the lithium battery is connected to the input end of the integrated chip U7, the output end of the integrated chip U7 outputs a 3.3V power supply, and the first power supply unit is used for converting the 4.2V power supply of the lithium battery into an output 3.3V power supply.

Preferably, the first power supply unit includes an integrated chip U9, diodes D2, D3, an inductor L4, a capacitor C33, C38, C39, C41, an NMOS tube Q3, a resistor R24, and an R31, the type of the integrated chip U9 is PT1301, the anode of the lithium battery, i.e. the BAT port in the drawing, is connected to the 4 pin of the integrated chip U2 through a forward diode D2 and the inductor L2, the cathode of the diode D2 is grounded through a capacitor C2, the 2 pin of the integrated chip U2 is connected to the gate of the NMOS tube Q2, the source of the NMOS tube Q2 is grounded, the drain of the NMOS tube Q2 is connected to the 4 pin of the integrated chip U2, the 4 pin of the integrated chip U2 is connected to the forward diode D2, the cathode output of the diode D2 is a 5V power supply, the 5V power supply is grounded through the parallel capacitor C2 and the C2, the cathode of the integrated chip U2 is connected to the diode D2 and the diode D2, the 5V power supply is grounded through resistors R24 and R31 which are connected in series, the middle ends of the resistors R24 and R31 are connected with the 6 pin of the integrated chip U9, and the 6 pin of the integrated chip U9 is connected with the 5V power supply through a capacitor C41.

Preferably, the second power supply unit includes an integrated chip U7, capacitors C34-37, a diode D4 and a resistor R28, wherein a pin 1 of the integrated chip U7 is connected to the anode of the lithium battery and is grounded through parallel capacitors C34 and C35, a pin 3 of the integrated chip U7 is reversely connected to the diode D4 to be connected to a 5V _ USB power supply and is grounded through a resistor R28, a pin 3 of the integrated chip U7 is connected to an IO port of the single chip, a pin 2 of the integrated chip U7 is grounded,

pins

4 and 5 of the integrated chip U7 are grounded through a capacitor C36 and a capacitor C37, an output pin 5 of the integrated chip U7 is a 3.3V power supply, and the model number of the integrated chip U7 is set to SP 6205-3.3.

Preferably, the charging unit includes integrated chip U8 and socket J2, 5V _ USB power is connected to integrated chip U8's input, integrated chip U8's output connection socket J2, connect the lithium cell on the socket J2, just integrated chip U8's the test end is connected the IO port of singlechip, integrated chip U8 is used for charging the lithium cell of connecting in socket J2, the singlechip detects that charges.

Preferably, the charging unit includes an integrated chip U8, a socket J2, a resistor R22, an R23, an R25, an R29, capacitors C32 and a C40, wherein a 4 pin of the integrated chip U8 is connected to a 5V _ USB power supply, the 5V _ USB power supply is grounded through a capacitor C32, 1 and 5 pins of the integrated chip U8 are connected to a 5V _ USB power supply through resistors R22 and R23, respectively, 1 and 5 pins of the integrated chip U8 are connected to an IO port of the single chip, a 2 pin of the integrated chip U8 is grounded, a 6 pin of the integrated chip U8 is grounded through a resistor R25, a 3 pin of the integrated chip U8 is grounded through a capacitor C40, and a 3 pin of the integrated chip U8 is connected to a 3 pin of the socket J2, a 3 pin of the socket J2 is a positive electrode of the lithium battery, the 2 pin of the socket J2 is empty, and a 1 pin of the socket J2 is grounded.

The utility model discloses the beneficial effect who reaches does:

1. the utility model discloses a set up first electrical unit and second electrical unit, realize two sets of mains operated, satisfy most mains operated system's demand.

2. The utility model discloses a set up self-locking circuit, avoided the self-locking control of mechanical type, the switching speed is fast for difficult wearing and tearing.

Drawings

Fig. 1 is a circuit diagram of a first power supply unit of the present invention;

fig. 2 is a circuit diagram of a second power supply unit of the present invention;

FIG. 3 is a circuit diagram of a charging unit according to the present invention;

FIG. 4 is a self-locking circuit diagram of the present invention;

fig. 5 is the schematic diagram of the connection of the single chip microcomputer of the present invention.

Detailed Description

In order to facilitate understanding of the present invention, the present invention will be described in more detail with reference to the accompanying drawings and specific embodiments. Preferred embodiments of the present invention are shown in the drawings. The invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for descriptive purposes only.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

The present invention will be described in detail with reference to the accompanying drawings.

As shown in fig. 1-5, the utility model provides a two sets of power supply circuit with self-locking function, including first power supply unit, second power supply unit, the charging unit, self-locking circuit and lithium cell, the lithium cell is connected first power supply unit, second power supply unit and self-locking circuit, the 5V _ USB power of charging unit's input port connection adapter, the output of charging unit is connected the lithium cell, the IO port of singlechip is connected to self-locking circuit.

The working principle of the self-locking circuit is that in the figure, KEY _ COND and EN _ A are respectively connected with an IO port of a single chip microcomputer, when a system is closed, EN _ A is at a low level through a resistor R26, an integrated chip U7 does not work, and the system is not powered on at the moment. When the switch K6 is pressed, EN _ a is high and the system starts. And because EN _ A is connected with the IO port of the single chip microcomputer, the IO port of the single chip microcomputer immediately pulls up EN _ A after the start, and at the moment, the power supply key is lifted, self-locking is realized, and the system normally works.

When the system is in an operating state, the switch K6 is not pressed, the EN _ A is at a high level at the moment, but only 50mV of voltage on the KEY _ COND can be considered as a low level due to the existence of the voltage dividing resistors R27 and R26, the KEY _ COND is pulled high and can be read by a singlechip when the switch K6 is pressed, the resistor R26 pulls low the IO pin level connected with the EN _ A after the power KEY is lifted, the SP6205 stops working, and the system is closed.

For example, the model of the integrated chip U9 sets the wireless PT 1301. The chip is a small-size high-efficiency boost DC/DC converter with the minimum starting voltage lower than 1V, and adopts a self-adaptive current mode PWM control loop. R24 and R31 are voltage dividing feedback resistors, and the output voltage of PT1301 is determined by the two resistorsDetermined, the calculation formula is shown below:

pins

It should be noted that, this application designs two sets of power supply systems 5V and 3.3V, and most power supply systems need 5V and 3.3V power supplies. The power supply adopts a lithium battery or a USB, a chip for converting 4.2V into 3.3V adopts SP6205-3.3, the chip is a low-dropout voltage regulator, and a chip for converting 5V into 4.2V and 5V adopts a PT1301 chip.

Preferably, the charging unit includes an integrated chip U8, a socket J2, a resistor R22, an R23, an R25, an R29, capacitors C32 and a C40, wherein a 4 pin of the integrated chip U8 is connected to a 5V _ USB power supply, the 5V _ USB power supply is grounded through a capacitor C32, 1 and 5 pins of the integrated chip U8 are connected to a 5V _ USB power supply through resistors R22 and R23, respectively, 1 and 5 pins of the integrated chip U8 are connected to an IO port of the single chip, a 2 pin of the integrated chip U8 is grounded, a 6 pin of the integrated chip U8 is grounded through a resistor R25, a 3 pin of the integrated chip U8 is grounded through a capacitor C40, and a 3 pin of the integrated chip U8 is connected to a 3 pin of the socket J2, a 3 pin of the socket J2 is a positive electrode of the lithium battery, the 2 pin of the socket J2 is empty, and a 1 pin of the socket J2 is grounded. And

pins

1 and 5 of the integrated chip U8 are used for carrying out charging detection to judge whether the charging state is a full-charging state. For example, the model of the integrated chip U8 is set to TP 4057.

Further, the charging unit still includes the electric quantity detection module, the electric quantity detection module is connected the 3 pins of socket J2, the electric quantity detection module includes resistance R29 and resistance R30, ground connection after resistance R29 and resistance R30 establish ties, and resistance R29 and resistance R30's intermediate end are connected the IO port of singlechip. The amount of electricity is detected by resistors R29 and R30.

Those not described in detail in this specification are within the skill of the art.

It should be noted that the above technical features are continuously combined with each other to form various embodiments which are not listed above, and all the embodiments are regarded as the scope of the present invention described in the specification; moreover, modifications and variations will occur to those skilled in the art in light of the foregoing description, and it is intended to cover all such modifications and variations as fall within the true spirit and scope of the invention as defined by the appended claims.

Claims

1. A double-set power circuit with a self-locking function is characterized in that: including first power supply unit, second power supply unit, charging unit, self-locking circuit and lithium cell, the lithium cell is connected first power supply unit, second power supply unit and self-locking circuit, the 5V _ USB power of charging unit's input port connection adapter, the output of charging unit is connected the lithium cell, the IO port of self-locking circuit connection singlechip.

2. The double-set power supply circuit with the self-locking function according to claim 1, characterized in that: the self-locking circuit comprises a switch K6, a resistor R26 and a resistor R27, one end of the switch K6 is connected with the anode of the lithium battery, the other end of the switch K6 is grounded through the resistor R26, the other end of the switch K6 is connected with the IO port of the single chip microcomputer, and the other end of the switch K6 is connected with the IO port of the single chip microcomputer through the resistor R27.

3. The double-set power supply circuit with the self-locking function according to claim 1, characterized in that: the first power supply unit includes integrated chip U9, the lithium cell is connected to integrated chip U9's input, integrated chip U9's output 5V power, first power supply unit is used for turning into the 4.2V power of lithium cell and exports 5V power, and affiliated second power supply unit includes integrated chip U7, the lithium cell is connected to integrated chip U7's input, integrated chip U7's output 3.3V power, first power supply unit is used for turning into the 4.2V power of lithium cell and exports 3.3V power.

4. The double-set power supply circuit with the self-locking function according to claim 3, wherein: the first power supply unit comprises an integrated chip U9, diodes D2 and D3, an inductor L4, capacitors C33, C38, C39, an NMOS tube Q39, resistors R39 and R39, the model of the integrated chip U39 is PT1301, the anode of the lithium battery is connected with the 4 pin of the integrated chip U39 through a positive diode D39 and the inductor L39, the cathode of the diode D39 is grounded through the capacitor C39, the 2 pin of the integrated chip U39 is connected with the grid of the NMOS tube Q39, the source of the NMOS tube Q39 is grounded, the drain of the NMOS tube Q39 is connected with the 4 pin of the integrated chip U39, the 4 pin of the integrated chip U39 is connected with the diode D39, the cathode output of the diode D39 is a 5V power supply, the 5V power supply is grounded through the capacitors C39 and C39 which are connected in parallel, the cathode of the integrated chip U39 and the resistor R39 are connected with the power supply and the resistor R39 in series, and the middle ends of the resistors R24 and R31 are connected with the 6 pins of the integrated chip U9, and the 6 pins of the integrated chip U9 are connected with a 5V power supply through a capacitor C41.

5. The double-set power supply circuit with the self-locking function according to claim 1, characterized in that: the second power supply unit comprises an integrated chip U7, capacitors C34-37, a diode D4 and a resistor R28, wherein a pin 1 of the integrated chip U7 is connected with the anode of a lithium battery and is grounded through capacitors C34 and C35 which are connected in parallel, a pin 3 of the integrated chip U7 is reversely connected with the diode D4 to be connected with a 5V _ USB power supply and is grounded through a resistor R28, a pin 3 of the integrated chip U7 is connected with an IO port of the single chip microcomputer, a pin 2 of the integrated chip U7 is grounded, pins 4 and 5 of the integrated chip U7 are grounded through a capacitor C36 and a capacitor C37 respectively, a pin 5 output of the integrated chip U7 is the 3.3V power supply, and the model of the integrated chip U7 is set to be 6205-3.3.

6. The double-set power supply circuit with the self-locking function according to claim 1, characterized in that: the charging unit includes integrated chip U8 and socket J2, 5V _ USB power is connected to integrated chip U8's input, integrated chip U8's output connection socket J2, connect the lithium cell on the socket J2, just integrated chip U8's detection end is connected the IO port of singlechip, integrated chip U8 is used for charging the lithium cell of connecting in socket J2, the singlechip detects that charges.

7. The double-set power supply circuit with the self-locking function according to claim 6, wherein: the charging unit comprises an integrated chip U8, a socket J2, resistors R22, R23, R25, R29, capacitors C32 and C40, wherein 4 pins of the integrated chip U8 are connected with a 5V _ USB power supply, the 5V _ USB power supply is grounded through a capacitor C32, 1 pin and 5 pin of the integrated chip U8 are respectively connected with the 5V _ USB power supply through resistors R22 and R23, 1 pin and 5 pin of the integrated chip U8 are respectively connected with an IO port of the single chip microcomputer, 2 pin of the integrated chip U8 is grounded, 6 pin of the integrated chip U8 is grounded through a resistor R25, 3 pin of the integrated chip U8 is grounded through a capacitor C40, 3 pin of the integrated chip U8 is connected with 3 pin of the socket J2, 3 pin of the socket J2 is the positive electrode of the lithium battery, 2 pin of the socket J2 is empty, and 1 pin of the socket J2 is grounded.