CN211480988U

CN211480988U - Dual-power supply switching system of portable equipment

Info

Publication number: CN211480988U
Application number: CN201922404835.4U
Authority: CN
Inventors: 舒晓明; 宋德周; 李志生; 王文贺; 孙明; 唐颖杰; 潘天宇; 杜燊; 杜文胜; 肖权
Original assignee: Shenzhen Jimi Iot Co ltd
Current assignee: Shenzhen Jimi Iot Co ltd
Priority date: 2019-12-27
Filing date: 2019-12-27
Publication date: 2020-09-11
Anticipated expiration: 2029-12-27

Abstract

The utility model provides a dual power supply switched systems of portable equipment, including load switch U1, NMOS pipe Q2, PMOS pipe Q3, clamping diode D4, resistance R9, resistance R8, resistance R7, load switch U1 'S pin 1, pin 2 connect main power VBAT _ M respectively, load switch U1' S pin 6, pin 7 respectively with NMOS pipe Q2 'S S utmost point is connected, NMOS pipe Q2' S D utmost point connects the system power supply VSYS, behind NMOS pipe Q2 'S the G utmost point is tandem resistance R9, resistance R8 with PMOS pipe Q3' S G utmost point is connected, PMOS pipe Q3 'S S utmost point connects vice power supply VBAT _ S, PMOS pipe Q3' S D utmost point connects the system power supply VSYS. The utility model has the advantages that: by adopting the simplified switching scheme, the development period is shortened, the firmware cost is reduced, the product universality is improved, and a universal, quick and efficient solution is provided for uninterrupted power supply of a portable equipment system.

Description

Dual-power supply switching system of portable equipment

Technical Field

The utility model relates to a power supply switched systems especially relates to a portable equipment dual supply power supply switched systems.

Background

In order to realize uninterrupted operation of portable equipment (such as vehicle-mounted locators and law enforcement instruments) for a long time, when the power of one party is exhausted or other factors need to be cut off, the power supply of the system needs to be switched to a standby power supply. Conventional Uninterruptible Power Supply (UPS) designs all use highly integrated power management chips or dedicated dual power switching management chips. These two designs: the former has high development cost and complex control and detection circuit. The latter has weak universality, high dependence on software and long development and authentication period. Especially, the special dual-power switching management chip is limited by the capacity of the chip, the risk of supply interruption is easy to occur, and products of the same type are not replaced in the market. Therefore, the fatal hidden danger is buried in the late-stage mass production of the product.

Therefore, how to effectively reduce the development cycle, reduce the firmware cost, and improve the product versatility is a technical problem to be solved urgently by those skilled in the art.

Disclosure of Invention

In order to solve the problems in the prior art, the utility model provides a portable equipment dual power supply switching system.

The utility model provides a dual power supply switching system of portable equipment, including load switch U1, NMOS pipe Q2, PMOS pipe Q3, clamp diode D4, resistance R9, resistance R8, resistance R7, pin 1, pin 2 of load switch U1 connect main power VBAT _ M respectively, pin 6, pin 7 of load switch U1 respectively with the S pole of NMOS pipe Q2 is connected, the D pole of NMOS pipe Q2 connects system power supply VSYS, the G pole of NMOS pipe Q2 is connected with the G pole of PMOS pipe Q3 behind the series connection resistance R9, resistance R8 in proper order, the S pole of PMOS pipe Q3 connects vice power supply VBAT _ S, the D pole of PMOS pipe Q3 connects system power supply VSYS, the pin 8 of load switch U1 respectively with the NMOS of clamp diode D4, the G pole of PMOS pipe Q2 is connected, the negative pole of clamp diode D6342 with the PMOS pipe Q2 is connected with the G pole of PMOS pipe Q4 respectively, the other end of the resistor R7 is connected with a secondary power supply VBAT _ S; in a normal state, the main power supply VBAT _ M outputs, when passing through the load switch U1, the pin 8 of the load switch U1 generates a continuous high level signal, so that the NMOS transistor Q2 is in a conducting state, meanwhile, the GT signal enables the clamping diode D4 to set the gate of the PMOS transistor Q3 high, the PMOS transistor Q3 works in a cut-off state, and the system power supply VSYS is provided by the main power BAT _ M at this time; when the main power supply BAT _ M is removed, the output control level of the pin 8 of the load switch U1 disappears, the NMOS transistor Q2 is turned off, the clamping diode D4 is deactivated, and after the secondary power supply VBAT _ S is divided, the PMOS transistor Q3 is in a conducting state, and the system power supply VSYS is switched to the secondary power supply VBAT _ S.

As a further improvement of the utility model, portable equipment dual power supply switched systems still includes electric capacity C5 and electric capacity C11, electric capacity C5's a termination main power VBAT _ M, other end ground connection, electric capacity C11's a termination system power supply VSYS, other end ground connection.

As a further improvement of the present invention, the dual power supply switching system of the portable device further includes a resistor R6, a resistor R10, a terminal of the resistor R6 is connected to the main power VBAT _ M, another terminal is connected to the pin 9 of the load switch U1, a terminal of the resistor R10 is connected to the pin 4 of the load switch U1, and the other terminal is grounded.

As a further improvement of the utility model, portable equipment dual power supply switched systems still includes inside charging circuit, inside charging circuit includes battery charging chip U15, battery charging chip U15 'S pin 4 connects main power VBAT _ M, battery charging chip U15' S pin 5 connects auxiliary power VBAT _ S.

The utility model has the advantages that: by the scheme, the simplified switching scheme is adopted, the development period is shortened, the firmware cost is reduced, the product universality is improved, and a universal, quick and efficient solution is provided for uninterrupted power supply of a portable equipment system.

Drawings

Fig. 1 is a circuit diagram of a dual power supply switching system of a portable device of the present invention.

Fig. 2 is a schematic diagram of the main power VBAT _ M of the dual power supply switching system of the portable device of the present invention.

Fig. 3 is a schematic diagram of the auxiliary power VBAT _ S of the dual power supply switching system of the portable device of the present invention.

Detailed Description

The present invention will be further described with reference to the following description and embodiments.

As shown in fig. 1 to 3, a dual power supply switching system for a portable device includes a load switch U1, an NMOS transistor Q2, a PMOS transistor Q3, a clamp diode D4, a resistor R9, a resistor R8, and a resistor R7, where pin 1 and pin 2 of the load switch U1 are respectively connected to a main power VBAT _ M, pin 6 and pin 7 of the load switch U1 are respectively connected to an S-pole of the NMOS transistor Q2, a D-pole of the NMOS transistor Q2 is connected to a system power supply VSYS, a G-pole of the NMOS transistor Q2 is connected in series to a G-pole of the PMOS transistor Q3 after being connected to the resistors R9 and R8, an S-pole of the PMOS transistor Q3 is connected to a sub power VBAT _ S, a D-pole of the PMOS transistor Q3 is connected to the system power supply VSYS, a pin 8 (i.e. a pin) of the load switch U1 is respectively connected to an anode of the clamp diode Q4, an NMOS pole G-pole of the clamp diode Q2, a cathode of the PMOS transistor Q599 and a cathode of the resistor R599, the other end of the resistor R7 is connected with a secondary power supply VBAT _ S; in a normal state, the main power supply VBAT _ M outputs, when passing through the load switch U1, the pin 8 of the load switch U1 generates a continuous high level signal, so that the NMOS transistor Q2 is in a conducting state, meanwhile, the GT signal enables the clamping diode D4 to set the gate of the PMOS transistor Q3 high, the PMOS transistor Q3 works in a cut-off state, and the system power supply VSYS is provided by the main power BAT _ M at this time; when the main power supply BAT _ M is removed, the output control level of the pin 8 of the load switch U1 disappears, the NMOS transistor Q2 is turned off, the clamping diode D4 is deactivated, and after the secondary power supply VBAT _ S is divided, the PMOS transistor Q3 is in a conducting state, and the system power supply VSYS is switched to the secondary power supply VBAT _ S.

As shown in fig. 1 to fig. 3, the dual power supply switching system of the portable device further includes a capacitor C5 and a capacitor C11, one end of the capacitor C5 is connected to the main power supply VBAT _ M, and the other end is connected to ground, and one end of the capacitor C11 is connected to the system power supply VSYS, and the other end is connected to ground.

As shown in fig. 1 to fig. 3, the dual power supply switching system of the portable device further includes a resistor R6 and a resistor R10, one end of the resistor R6 is connected to the main power VBAT _ M, the other end is connected to the pin 9 of the load switch U1, one end of the resistor R10 is connected to the pin 4 of the load switch U1, and the other end is grounded.

As shown in fig. 1 to fig. 3, the dual power supply switching system of the portable device further includes an internal charging circuit 101, the internal charging circuit 101 includes a battery charging chip U15, a resistor R12, a resistor R13, and a resistor R14, a pin 4 of the battery charging chip U15 is connected to the main power VBAT _ M, a pin 5 of the battery charging chip U15 is connected to the secondary power VBAT _ S, and the secondary power VBAT _ S is charged after discharging is completed, so as to ensure that the secondary power VBAT _ S has sufficient electric quantity when switching next time. The charging circuit 101 may be modified or deleted according to circuit requirements.

The utility model provides a pair of portable equipment dual power supply switched systems, through switching on and the off-state of NMOS and PMOS among the control circuit, accomplish and switch the power supply work to system power VSYS, ensure the continuous work of whole uninterrupted power supply.

The utility model provides a pair of portable equipment dual power supply switched systems, concrete theory of operation as follows:

1. as shown in fig. 2, in the normal state, the main power VBAT _ M outputs a continuously high signal generated by pin 8 (GT) when the power passes through the load switch U1. This signal causes the Q2 tube to be in a conducting state; at the same time, the GT signal causes the clamping diode D4 to raise the gate of the Q3 transistor, turning off the Q3 transistor. The system power VSYS is now provided by the master BAT _ M.

2. As shown in fig. 3, when main power supply BAT _ M is removed, the GT pin output control level of load switch U1 disappears. The Q2 pipe is cut off and closed; while the clamping diode D4 is deactivated. After VBAT _ S is divided, the Q3 tube is in a conducting state. The system power supply VSYS switches to VBAT _ S.

3. The load switch U1 (pin GT) goes high again after the main power VBAT _ M supply is provided. The Q2 pipe is conducted; the Q3 tube is cut off. The system power supply VSYS switches back to the main power supply VBAT _ M, the process is as shown in fig. 2. And the whole system completes the power supply switching work.

The utility model provides a pair of portable equipment dual power supply switched systems, reasonable control U1 pipe produces high level control signal during operation, accomplishes and controls operating condition NMOS and PMOS pipe completely opposite, ensures that only the MOS pipe of the same kind leads to at any moment, accomplishes the incessant power supply to the system. The whole switching process does not need software control. And no requirement is made on the platform and the main control chip. The accessory charging circuit 101 may be replaced or deleted according to actual circuit design requirements. The utility model discloses can wide application in handheld terminal equipment two lithium battery switching circuit, car machine module OVP circuit, on the products such as the uninterrupted power supply circuit of sharing bicycle.

The foregoing is a more detailed description of the present invention, taken in conjunction with the specific preferred embodiments thereof, and it is not intended that the invention be limited to the specific embodiments shown and described. To the utility model belongs to the technical field of ordinary technical personnel, do not deviate from the utility model discloses under the prerequisite of design, can also make a plurality of simple deductions or replacement, all should regard as belonging to the utility model discloses a protection scope.

Claims

1. The utility model provides a portable equipment dual power supply switching system which characterized in that: the load switch comprises a load switch U1, an NMOS tube Q2, a PMOS tube Q3, a clamping diode D4, a resistor R9, a resistor R8 and a resistor R7, wherein a pin 1 and a pin 2 of the load switch U1 are respectively connected with a main power supply VBAT _ M, a pin 6 and a pin 7 of the load switch U1 are respectively connected with an S pole of the NMOS tube Q2, a D pole of the NMOS tube Q2 is connected with a system power supply VSYS, a G pole of the NMOS tube Q2 is connected with a resistor R9 and a resistor R8 in series and then connected with a G pole of the PMOS tube Q3, an S pole of the PMOS tube Q3 is connected with a secondary power supply VBAT _ S, a D pole of the PMOS tube Q3 is connected with the system power supply VSYS, a pin 8 of the load switch U1 is respectively connected with an anode of the clamping diode D4 and a G pole of the NMOS tube Q2, and a cathode of the clamping diode D4 is respectively connected with one end of the PMOS tube Q8253 and the other secondary power supply resistor VBAT 8427; in a normal state, the main power supply VBAT _ M outputs, when passing through the load switch U1, the pin 8 of the load switch U1 generates a continuous high level signal, so that the NMOS transistor Q2 is in a conducting state, meanwhile, the GT signal enables the clamping diode D4 to set the gate of the PMOS transistor Q3 high, the PMOS transistor Q3 works in a cut-off state, and the system power supply VSYS is provided by the main power BAT _ M at this time; when the main power supply BAT _ M is removed, the output control level of the pin 8 of the load switch U1 disappears, the NMOS transistor Q2 is turned off, the clamping diode D4 is deactivated, and after the secondary power supply VBAT _ S is divided, the PMOS transistor Q3 is in a conducting state, and the system power supply VSYS is switched to the secondary power supply VBAT _ S.

2. The dual power supply switching system of portable device of claim 1, wherein: the dual-power supply switching system of the portable equipment further comprises a capacitor C5 and a capacitor C11, one end of the capacitor C5 is connected with a main power supply VBAT _ M, the other end of the capacitor C5 is grounded, one end of the capacitor C11 is connected with a system power supply VSYS, and the other end of the capacitor C11 is grounded.

3. The dual power supply switching system of portable device of claim 1, wherein: the dual-power-supply switching system of the portable equipment further comprises a resistor R6 and a resistor R10, one end of the resistor R6 is connected with a main power supply VBAT _ M, the other end of the resistor R6 is connected with a pin 9 of a load switch U1, one end of the resistor R10 is connected with a pin 4 of a load switch U1, and the other end of the resistor R10 is grounded.

4. The dual power supply switching system of portable device of claim 1, wherein: the dual power supply switching system of the portable device further comprises an internal charging circuit, the internal charging circuit comprises a battery charging chip U15, a pin 4 of the battery charging chip U15 is connected with a main power supply VBAT _ M, and a pin 5 of the battery charging chip U15 is connected with a secondary power supply VBAT _ S.