CN218630738U

CN218630738U - Low-power consumption singlechip power supply circuit

Info

Publication number: CN218630738U
Application number: CN202222977331.3U
Authority: CN
Inventors: 薄中亚
Original assignee: Changzhou Bomedent Medical Technology Co ltd
Current assignee: Changzhou Bomedent Medical Technology Co ltd
Priority date: 2022-11-09
Filing date: 2022-11-09
Publication date: 2023-03-14
Anticipated expiration: 2032-11-09

Abstract

The utility model provides a low-power consumption singlechip power supply circuit, which is characterized in that the power supply circuit comprises a first electronic switch and a capacitor, wherein the first end of the first electronic switch is connected to a power supply, and the second end of the first electronic switch is used as a power supply output end; the first end of the capacitor is connected to the third end of the first electronic switch, the first end of the capacitor is also connected to a power supply through a first resistor, and the second end of the capacitor is grounded; two ends of the capacitor are connected with a mechanical switch in parallel. The utility model provides a pair of singlechip power supply circuit of low-power consumption, low power dissipation under the standby state practices thrift the power electric energy.

Description

Low-power consumption singlechip power supply circuit

Technical Field

The utility model belongs to the technical field of power supply circuit, particularly, relate to a singlechip power supply circuit of low-power consumption.

Background

At present, in the products based on the single chip microcomputer on the market, a dormancy scheme without cutting off a power supply is adopted after the products are shut down, namely a peripheral circuit continues to work, and the single chip microcomputer is in a dormancy state. And if the single chip microcomputer needs to work again, the single chip microcomputer is awakened through a key. In this mode, the single chip microcomputer needs to consume electric quantity when sleeping, and peripheral circuits such as an MOS tube, a resistor and a capacitor also consume electric energy of a battery. If the product is transported and stored for a long time, the product cannot be started due to the fact that the battery power of the product is exhausted, and user experience is influenced.

Disclosure of Invention

The utility model provides a to above-mentioned not enough, provide a singlechip power supply circuit of low-power consumption, low power dissipation under the standby state practices thrift the power electric energy.

In order to solve the technical problem, the utility model adopts the following technical scheme:

the utility model provides a singlechip power supply circuit of low-power consumption, including power supply circuit, power supply circuit includes first electronic switch and electric capacity, the first end of first electronic switch is connected to the power, the second end of first electronic switch is as the power supply output end, the third end of first electronic switch is connected to the first end of electric capacity; the second end of the capacitor is grounded, and the first end of the capacitor is also connected to a power supply through a first resistor; two ends of the capacitor are connected with a mechanical switch in parallel.

As a further improvement of the present invention, when the single chip is in a standby state, the power supply charges the capacitor through the first resistor, so that the first electronic switch is turned off; when the mechanical switch is closed, the capacitor discharges to ground, so that the first electronic switch is conducted.

As a further improvement of the utility model, the device further comprises a control circuit, wherein the control circuit is connected to the third end of the first electronic switch; the control circuit is used for controlling the first electronic switch to keep a conducting state when the single chip microcomputer is in a working state.

As a further improvement of the present invention, the control circuit includes a second electronic switch, the first end of the second electronic switch is connected to the third end of the first electronic switch, the second end of the second electronic switch is grounded, the third end of the second electronic switch is used as the power supply control end, and the third end is grounded through a second resistor.

As a further improvement of the present invention, the first electronic switch is a P-channel MOS transistor.

As a further improvement of the present invention, the first end of the first electronic switch corresponds to the source electrode of the P-channel MOS transistor, the second end of the first electronic switch corresponds to the drain electrode of the P-channel MOS transistor, and the third end of the first electronic switch corresponds to the gate electrode of the P-channel MOS transistor.

As a further improvement of the utility model, the second electronic switch is an N-channel MOS tube.

As a further improvement of the present invention, the first end of the second electronic switch corresponds to the drain of the N-channel MOS transistor, the second end of the second electronic switch corresponds to the source of the N-channel MOS transistor, and the third end of the second electronic switch corresponds to the gate of the N-channel MOS transistor.

Compared with the prior art, the technical scheme of the utility model following beneficial effect has: the utility model provides a singlechip power supply circuit of low-power consumption sets up electric capacity through the third end at first electronic switch, controls switching on and ending of first electronic switch. When the singlechip is in a standby state, the power supply charges the capacitor through the first resistor, so that the first electronic switch is cut off, and the power supply output end does not output power. When the mechanical switch is closed, the first electronic switch is turned on to supply power to the singlechip and the peripheral circuit thereof. The utility model discloses a singlechip power supply circuit does not supply power for singlechip and peripheral circuit under the standby state, and the low power dissipation practices thrift the power electric energy.

Drawings

Fig. 1 is a schematic structural diagram of a power supply circuit of a low-power-consumption single chip microcomputer according to the embodiment.

Description of the main elements

Power VCC

First electronic switch Q1

A first resistor R1

Capacitor C1

Mechanical switch S1

Second electronic switch Q2

Second resistor R2

Power supply output terminal VOUT

Supply end control end POWER ON

Ground GND

Detailed Description

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

The utility model provides a singlechip power supply circuit of low-power consumption is applied to on the mainboard of singlechip product, for singlechip and peripheral circuit power supply.

As shown in fig. 1, a preferred embodiment is shown. The power supply output end of the singlechip power supply circuit of the embodiment is connected with the singlechip and the peripheral circuit thereof. The power supply control end of the power supply control circuit is connected with a control pin of the single chip microcomputer, the control pin is set to output a high level when the single chip microcomputer works, and output a low level when the single chip microcomputer is shut down.

The power supply circuit of the single chip microcomputer of the present embodiment, as shown in fig. 1, includes a first electronic switch Q1, a first resistor R1, and a capacitor C1. The first terminal of the first electronic switch Q1 is connected to a power supply VCC, and the second terminal of the first electronic switch Q1 is used as a power supply output terminal VOUT. The first end of the capacitor C1 is connected to the third end of the first electronic switch Q1, the first end of the capacitor C1 is also connected to a power supply VCC through a first resistor R1, and the second end of the capacitor C1 is connected to a grounding terminal GND. Two ends of the capacitor C1 are connected with a mechanical switch S1 in parallel, the mechanical switch S1 is closed instantly only when the single chip microcomputer is started, and the single chip microcomputer is kept in an open state in a working state and a standby state.

In the power supply circuit of the single chip microcomputer of the embodiment, the capacitor C1 is arranged at the third end of the first electronic switch Q1, and the mechanical switch S1 is connected in parallel at the two ends of the capacitor C1, so that the first electronic switch Q1 is controlled to be switched on and off. When the single chip microcomputer is in a standby state, the power supply VCC charges the capacitor C1 through the first resistor R1, so that the first electronic switch Q1 is cut off, and the power supply output end VOUT does not output. When the mechanical switch S1 is closed, the capacitor C1 discharges to the ground, so that the first electronic switch Q1 is turned on, thereby supplying power to the single chip microcomputer and peripheral circuits thereof. The utility model discloses a singlechip power supply circuit does not supply power for singlechip and peripheral circuit under the standby state, and the low power dissipation practices thrift the power electric energy.

The POWER supply circuit for the single chip microcomputer further comprises a second electronic switch Q2, a first end of the second electronic switch Q2 is connected to a third end of the first electronic switch Q1, a second end of the second electronic switch Q2 is connected to a ground terminal GND, the third end of the second electronic switch Q2 is used as a POWER supply control terminal POWER ON, and the third end is connected to the ground terminal GND through a second resistor R2. In this embodiment, the third terminal of the first electronic switch Q1 is provided with the control circuit, and when the single chip microcomputer is turned on, the first electronic switch Q1 is controlled to keep a conducting state.

The first electronic switch Q1 is a P-channel MOS transistor. The first end of the first electronic switch Q1 corresponds to the source electrode of the P-channel MOS tube, the second end of the first electronic switch Q1 corresponds to the drain electrode of the P-channel MOS tube, and the third end of the second electronic switch Q1 corresponds to the grid electrode of the P-channel MOS tube. The second electronic switch Q2 is an N-channel MOS transistor. A first end of the second electronic switch Q2 corresponds to a drain electrode of the N-channel MOS transistor, a second end of the second electronic switch Q2 corresponds to a source electrode of the N-channel MOS transistor, and a third end of the second electronic switch Q2 corresponds to a gate electrode of the N-channel MOS transistor.

In this embodiment, when VCC is 3.3V and the resistance of the first resistor R1 is 500K Ω, the current of the whole circuit in the standby state is only 6.6ua and 800ma lithium battery can be standby for 13 years.

The working process of the low-power-consumption singlechip power circuit of the embodiment is as follows:

when the single chip microcomputer is in a standby state, a control pin connected with the power supply control end of the single chip microcomputer is not output, and the control circuit does not work. The mechanical switch S1 is in an open state, and the capacitor C1 is charged by the power supply VCC, so that the grid of the first electronic switch Q1 is continuously at a high level, the first electronic switch Q1 is continuously cut off, and the power supply output end VOUT does not output power and does not supply power to the single chip microcomputer and peripheral circuits thereof.

When the single chip microcomputer is started, the mechanical switch S1 is closed, the capacitor C1 discharges to the ground, the grid electrode of the first electronic switch Q1 is at a low level, and the first electronic switch Q1 is conducted, so that power is supplied to the single chip microcomputer and peripheral circuits of the single chip microcomputer. When the single chip microcomputer is started and is in a working state, the single chip microcomputer outputs a high level through a control pin connected with the power supply control end, so that the grid of the second electronic switch Q2 is the high level, the second electronic switch Q2 is conducted, the grid of the first electronic switch Q1 is continuously the low level, the first electronic switch Q1 is continuously conducted, and then the single chip microcomputer and the peripheral circuits of the single chip microcomputer are continuously supplied with power.

When the single chip microcomputer is turned off, a control pin connected with the power supply control end of the single chip microcomputer outputs a low level, so that the grid of the second electronic switch Q2 is at the low level, and the second electronic switch Q2 is cut off. The power VCC charges the capacitor C1 through the first resistor R1, so that the grid of the first electronic switch Q1 is at a high level, the first electronic switch Q1 is cut off, the power supply output end VOUT does not output, and the power supply is no longer supplied to the singlechip and the peripheral circuit thereof.

The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are given by way of illustration only, and that various changes and modifications may be made without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. The power supply circuit of the single chip microcomputer with low power consumption is characterized by comprising a power supply circuit, wherein the power supply circuit comprises a first electronic switch and a capacitor, the first end of the first electronic switch is connected to a power supply, the second end of the first electronic switch is used as a power supply output end, and the third end of the first electronic switch is connected to the first end of the capacitor; the second end of the capacitor is grounded, and the first end of the capacitor is also connected to a power supply through a first resistor; two ends of the capacitor are connected with a mechanical switch in parallel.

2. The power supply circuit of claim 1, wherein when the single chip microcomputer is in a standby state, the power supply charges the capacitor through the first resistor, so that the first electronic switch is turned off; when the mechanical switch is closed, the capacitor discharges to ground, so that the first electronic switch is conducted.

3. The single-chip microcomputer power supply circuit of claim 1, further comprising a control circuit, wherein the control circuit is connected to the third end of the first electronic switch; the control circuit is used for controlling the first electronic switch to keep a conducting state when the single chip microcomputer is in a working state.

4. The single chip power supply circuit of claim 3, wherein the control circuit comprises a second electronic switch, a first terminal of the second electronic switch is connected to a third terminal of the first electronic switch, a second terminal of the second electronic switch is grounded, a third terminal of the second electronic switch is used as a power supply control terminal, and the third terminal is grounded through a second resistor.

5. The power supply circuit of claim 1, wherein the first electronic switch is a P-channel MOS transistor.

6. The single chip microcomputer power supply circuit of claim 5, wherein a first terminal of the first electronic switch corresponds to a source electrode of the P-channel MOS transistor, a second terminal of the first electronic switch corresponds to a drain electrode of the P-channel MOS transistor, and a third terminal of the first electronic switch corresponds to a gate electrode of the P-channel MOS transistor.

7. The single-chip microcomputer power supply circuit according to claim 4, wherein the second electronic switch is an N-channel MOS transistor.

8. The single chip microcomputer power supply circuit according to claim 7, wherein a first terminal of the second electronic switch corresponds to a drain electrode of the N-channel MOS transistor, a second terminal of the second electronic switch corresponds to a source electrode of the N-channel MOS transistor, and a third terminal of the second electronic switch corresponds to a gate electrode of the N-channel MOS transistor.