CN219938328U - Switching circuit and electronic equipment - Google Patents
Switching circuit and electronic equipment Download PDFInfo
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- CN219938328U CN219938328U CN202321558380.1U CN202321558380U CN219938328U CN 219938328 U CN219938328 U CN 219938328U CN 202321558380 U CN202321558380 U CN 202321558380U CN 219938328 U CN219938328 U CN 219938328U
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- negative pressure
- power switch
- electrically connected
- power supply
- switching circuit
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Abstract
The utility model provides a switching circuit and electronic equipment, wherein a negative pressure loop is arranged at the front end of a power switch, when a power supply is to be started, the negative pressure loop can be started based on an enabling signal generated by mcu of the electronic equipment, so that the negative pressure loop generates a reverse voltage of the power supply and outputs the reverse voltage to the switching circuit, the power switch is further turned on, the voltage drop of the power switch when the power switch is turned on is reduced, and the problem that a large voltage drop is generated after the conventional MOS tube is turned on is solved.
Description
Technical Field
The present utility model relates to the field of electronic power, and in particular, to a switching circuit and an electronic device.
Background
The PMOS tube is conducted when Vgs is negative pressure, and can be used as a switch of a power supply. The on-resistance Rds (on) decreases with the voltage of Vgs, if vgs= -3.3V is turned on under low voltage conditions (e.g. vs=3.3v), referring to fig. 1, the on-resistance is very large under vgs= -3.3V conditions, and if v=i×r is generated under high current conditions, according to ohm's law, the voltage at the back end of the actual MOS switch is far lower than 3.3V, resulting in abnormal back end voltage.
In view of this, the present utility model has been proposed.
Disclosure of Invention
The utility model discloses a switching circuit and electronic equipment, and aims to solve the problem that the conventional MOS tube generates larger voltage drop after being conducted.
The first embodiment of the utility model provides a switching circuit, which comprises a negative voltage loop and a power switch;
the input end of the negative pressure loop and the input end of the power switch are electrically connected with a power supply, the output end of the negative pressure loop is electrically connected with the control end of the power switch, the enabling end of the negative pressure loop is connected with the MCU, and the output end of the power switch is connected with the power supply end of the electronic equipment;
when the negative pressure loop is configured to receive an enabling signal of the MCU, a reverse voltage is generated to the power switch, so that the voltage drop of the power switch when the power switch is conducted is reduced.
Preferably, the negative pressure loop comprises a negative pressure chip and a first filter loop arranged on the negative pressure chip;
the input end of the negative pressure chip is electrically connected with the power supply, and the output end of the negative pressure chip is electrically connected with the control end of the power switch.
Preferably, the negative pressure chip is of the type SGM3209.
Preferably, the power switch comprises a Pmos tube and a second filter loop arranged on the Pmos tube;
the G pole of the Pmos tube is electrically connected with the output end of the negative pressure loop, the S pole of the Pmos tube is used for being connected with a power supply, and the D pole of the Pmos tube is electrically connected with the power supply end of the electronic equipment.
The second embodiment of the utility model provides an electronic device, which comprises a power supply, an MCU and any one of the switching circuits, wherein the output end of the power supply is electrically connected with the input end of the negative pressure loop and the input end of the power switch, the output end of the MCU is electrically connected with the enabling end of the negative pressure loop, and the output end of the power switch is electrically connected with the power supply end of the electronic device.
According to the switching circuit and the electronic equipment provided by the utility model, the negative pressure loop is configured at the front end of the power switch, when the power is to be turned on, the negative pressure loop can be turned on based on the enabling signal generated by mcu of the electronic equipment, so that the negative pressure loop generates a reverse voltage of the power and outputs the reverse voltage to the switching circuit, the power switch is further turned on, the voltage drop of the power switch when the power switch is turned on is reduced, and the problem that the conventional MOS tube generates a larger voltage drop after being turned on is solved.
Drawings
FIG. 1 is a diagram of switching characteristics in the background art;
fig. 2 is a schematic diagram of a switching circuit according to a first embodiment of the present utility model.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments. All other embodiments, based on the embodiments of the utility model, which are apparent to those of ordinary skill in the art without inventive faculty, are intended to be within the scope of the utility model. Thus, the following detailed description of the embodiments of the utility model, as presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. All other embodiments, based on the embodiments of the utility model, which are apparent to those of ordinary skill in the art without inventive faculty, are intended to be within the scope of the utility model.
Specific embodiments of the present utility model will be described in detail below with reference to the accompanying drawings.
The utility model discloses a switching circuit and electronic equipment, and aims to solve the problem that the conventional MOS tube generates larger voltage drop after being conducted.
Referring to fig. 2, a first embodiment of the present utility model provides a switching circuit, which includes a negative voltage circuit 1 and a power switch 2;
the input end of the negative pressure loop 1 and the input end of the power switch 2 are used for being electrically connected with a power supply, the output end of the negative pressure loop 1 is electrically connected with the control end of the power switch 2, the enabling end of the negative pressure loop 1 is used for being connected with an MCU, and the output end of the power switch 2 is used for being connected with the power supply end of electronic equipment;
when the negative pressure loop 1 is configured to receive the enable signal of the MCU, a reverse voltage is generated to the power switch 2, so that the voltage drop of the power switch 2 when turned on is reduced.
It should be noted that, under the low voltage condition, the resistor when the PMOS transistor Q18 is turned on is very large, and the voltage at the rear end is far lower than the voltage at the front end, which is easy to cause the voltage abnormality at the rear end.
In this embodiment, by configuring a negative pressure loop 1 at the front end of the power switch 2, when the power is to be turned on, the negative pressure loop 1 may be turned on based on an enable signal generated by mcu of the electronic device, so that the negative pressure loop 1 generates a reverse voltage of the power and outputs the reverse voltage to the switch circuit, so that the power switch 2 is turned on, and a voltage drop of the power switch 2 when turned on is reduced, thereby solving a problem that a larger voltage drop is generated after the existing MOS transistor is turned on.
In one possible embodiment of the present utility model, the negative pressure circuit 1 includes a negative pressure chip U29, and a first filter circuit disposed on the negative pressure chip U29;
the input end of the negative pressure chip U29 is electrically connected with the power supply, and the output end of the negative pressure chip U29 is electrically connected with the control end of the power switch 2.
It should be noted that, in this embodiment, the main function of the circuit is to add a switch to +3.3v for turning on and off the +3.3v voltage, wherein the negative pressure chip U29 is used to convert +3.3v to-3.3v. Switch_on controls the chip enable. When switch_on=0, the chip has no output (high resistance); when switch_on=1, the chip outputs-3.3V.
In one possible embodiment of the present utility model, the negative pressure chip U29 may be of the type SGM3209.
It should be noted that, in other embodiments, the negative pressure chip U29 may be of other types, which are not limited herein, but all the solutions are within the scope of the present utility model.
In one possible embodiment of the present utility model, the power switch 2 includes a PMOS transistor Q18, and a second filter circuit configured on the PMOS transistor Q18;
the G pole of the PMOS tube Q18 is electrically connected with the output end of the negative pressure loop 1, the S pole of the PMOS tube Q18 is used for connecting a power supply, and the D pole of the PMOS tube Q18 is electrically connected with the power supply end of the electronic equipment.
The model of the PMOS tube Q18 can be, but not limited to, UTT50P04G_S0IC8, which is used as a power switch 2 for controlling the opening and closing of +3.3V; when Vgs < Vgs (on), the power is turned on; vgs=0, the power is turned off.
The actual working principle of the above embodiment is briefly described below:
when switch_on=0 (when no enabling signal is available), the negative voltage chip U29 does not output, vs=vg=3.3v of the PMOS transistor Q18, vgs=0, and at this time, the PMOS transistor Q18 turns off the power supply;
when switch_on=1 (when there is an enable signal), the negative voltage chip U29 outputs-3.3V, vs=3.3v, vg= -3.3V, vgs= -6.6V of the PMOS transistor Q18, and the PMOS transistor Q18 turns ON the power supply.
When the PMOS tube Q18 is conducted, vgs reaches-6.6V, referring to the characteristic of the PMOS tube Q18 in FIG. 1, the on-resistance Rds (on) =10mOhm of-6.6V is far lower than the on-resistance of the original circuit Vgs= -3.3V, so that the voltage drop of the MOS tube in the conduction process is far reduced.
The second embodiment of the present utility model provides an electronic device, including a power supply, an MCU, and any one of the foregoing switch circuits, where an output end of the power supply is electrically connected to an input end of the negative pressure circuit 1 and an input end of the power switch 2, an output end of the MCU is electrically connected to an enable end of the negative pressure circuit 1, and an output end of the power switch 2 is electrically connected to a power supply end of the electronic device.
According to the switching circuit and the electronic equipment provided by the utility model, the negative pressure loop 1 is configured at the front end of the power switch 2, when the power is to be turned on, the negative pressure loop 1 can be turned on based on the enabling signal generated by mcu of the electronic equipment, so that the negative pressure loop 1 generates a reverse voltage of the power and outputs the reverse voltage to the switching circuit, the power switch 2 is further turned on, the voltage drop of the power switch 2 when turned on is reduced, and the problem that the conventional MOS tube generates a larger voltage drop after being turned on is solved.
The above is only a preferred embodiment of the present utility model, and the protection scope of the present utility model is not limited to the above examples, and all technical solutions belonging to the concept of the present utility model belong to the protection scope of the present utility model.
Claims (5)
1. A switching circuit is characterized by comprising a negative pressure loop and a power switch;
the input end of the negative pressure loop and the input end of the power switch are electrically connected with a power supply, the output end of the negative pressure loop is electrically connected with the control end of the power switch, the enabling end of the negative pressure loop is connected with the MCU, and the output end of the power switch is connected with the power supply end of the electronic equipment;
when the negative pressure loop is configured to receive an enabling signal of the MCU, a reverse voltage is generated to the power switch, so that the voltage drop of the power switch when the power switch is conducted is reduced.
2. The switching circuit according to claim 1, wherein the negative voltage loop comprises a negative voltage chip, a first filter loop disposed on the negative voltage chip;
the input end of the negative pressure chip is electrically connected with the power supply, and the output end of the negative pressure chip is electrically connected with the control end of the power switch.
3. A switching circuit according to claim 2, wherein the negative voltage chip is of the SGM3209 type.
4. The switching circuit of claim 1 wherein said power switch comprises a Pmos tube, a second filter loop disposed on said Pmos tube;
the G pole of the Pmos tube is electrically connected with the output end of the negative pressure loop, the S pole of the Pmos tube is used for being connected with a power supply, and the D pole of the Pmos tube is electrically connected with the power supply end of the electronic equipment.
5. An electronic device, comprising a power supply, an MCU, and a switching circuit according to any one of claims 1 to 4, wherein an output of the power supply is electrically connected to an input of the negative pressure circuit and an input of the power switch, an output of the MCU is electrically connected to an enable of the negative pressure circuit, and an output of the power switch is electrically connected to a power supply of the electronic device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321558380.1U CN219938328U (en) | 2023-06-19 | 2023-06-19 | Switching circuit and electronic equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321558380.1U CN219938328U (en) | 2023-06-19 | 2023-06-19 | Switching circuit and electronic equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219938328U true CN219938328U (en) | 2023-10-31 |
Family
ID=88493622
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321558380.1U Active CN219938328U (en) | 2023-06-19 | 2023-06-19 | Switching circuit and electronic equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219938328U (en) |
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2023
- 2023-06-19 CN CN202321558380.1U patent/CN219938328U/en active Active
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