CN220964369U - Battery voltage detection turn-off circuit - Google Patents
Battery voltage detection turn-off circuit Download PDFInfo
- Publication number
- CN220964369U CN220964369U CN202322545664.3U CN202322545664U CN220964369U CN 220964369 U CN220964369 U CN 220964369U CN 202322545664 U CN202322545664 U CN 202322545664U CN 220964369 U CN220964369 U CN 220964369U
- Authority
- CN
- China
- Prior art keywords
- circuit
- battery
- mcu
- power
- current limiting
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000001514 detection method Methods 0.000 title claims abstract description 54
- 230000000694 effects Effects 0.000 abstract description 3
- 230000007547 defect Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Landscapes
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The utility model relates to a battery voltage detection shutdown circuit, comprising: a battery; the power-on/off circuit comprises a power-on circuit and a power-off circuit; the battery voltage detection circuit is connected with the battery at the power input end and used for detecting the voltage of the battery; the MCU is connected with the battery voltage detection circuit; the starting circuit is connected with the battery and used for supplying power to the MCU; the MCU is used for receiving the detection signal of the battery voltage detection circuit and controlling the shutdown circuit to turn off the power supply of the startup circuit through the detection signal. When the circuit is in a shutdown state, the power_on port of the MCU is in a low level, the NPN triode is cut off, the grid level of the MOS tube is high, the MOS tube is cut off, and the battery voltage cannot pass through the MOS tube, so that the battery cannot provide POWER for the MCU, the MCU does not work, equipment controlled by the MCU does not work, and therefore the effects of saving electric energy and prolonging the service life of the battery are achieved.
Description
Technical Field
The utility model relates to the technical field of audio, in particular to a battery voltage detection turn-off circuit.
Background
In battery voltage detection circuits, when it is detected that the battery voltage is below a predetermined threshold to shut down the device, components associated with the device, such as a Microphone (MIC) and LED lights, are typically continuously powered to ensure that they are still functioning properly during shutdown of the device. Although the continuous power supply mode is favorable for providing necessary functions when needed, the continuous power supply mode also causes the waste of electric power and shortens the service life of the battery.
When the existing battery voltage detection circuit is powered off, the state of the device can be displayed by the MIC or LED lamp through continuous power supply. Such status displays typically include turning the device on, off, or performing certain specific operations, etc. Since no operation is required any more when the device has been powered down, continuing to power the MIC or LED light not only increases the burden on the battery, but also causes a waste of power.
Therefore, it is now highly demanded to provide a battery voltage detection turn-off circuit to solve the above-mentioned problems.
Disclosure of utility model
The utility model aims to overcome the defects and the defects of the prior art, provide a battery voltage detection turn-off circuit, prevent a battery from continuously supplying power to an MIC or an LED lamp when equipment is in a power-off state, save electric energy and prolong the service life of the battery.
The aim of the utility model is realized by the following technical scheme:
A battery voltage detection shutdown circuit includes
A battery;
the power-on/off circuit comprises a power-on circuit and a power-off circuit;
The power supply input end of the battery voltage detection circuit is connected with the battery and used for detecting the voltage of the battery;
the MCU is connected with the battery voltage detection circuit;
the starting circuit is connected with the battery and used for supplying power to the MCU;
The MCU is used for receiving a detection signal of the battery voltage detection circuit and controlling the shutdown circuit to turn off a power supply of the startup circuit through the detection signal;
The battery voltage detection turn-off circuit further comprises a turn-on/off KEY, the turn-on circuit comprises a diode D1, a diode D2, a battery and an MOS tube, the turn-on/off KEY is respectively and electrically connected with the diode D1 and the diode D2, the diode D1 is connected with a POWER_KEY port of the MCU, a first output end of the battery is connected with a source electrode of the MOS tube, and a drain electrode of the MOS tube is connected with a B+ port of the MCU to supply POWER to the MCU;
The battery voltage detection circuit comprises a PNP type triode, a diode D4 and an NPN type triode, wherein the second output end of the battery is connected with the emitter of the PNP type triode, the base electrode of the PNP type triode is connected with the anode of the diode D4, the cathode of the diode D4 is connected with the base electrode of the NPN type triode, the emitter of the NPN type triode is grounded, a divider resistor is arranged between the PNP type triode and the battery, and the collector of the PNP type triode is connected with the BAT+V_DET port of the MCU after being divided.
As a preferable technical scheme of the utility model, the POWER_ON port of the MCU is connected with the collector electrode of the NPN triode, and the emitter electrode of the NPN triode is grounded.
As a preferable technical scheme of the utility model, the startup circuit further comprises a diode D3, the grid electrode of the MOS tube is connected with the positive electrode of the diode D3, the negative electrode of the diode D3 is connected with the base electrode of the NPN triode, and the emitter electrode of the NPN triode is grounded.
As a preferable embodiment of the present utility model, the voltage dividing resistor includes a first resistor and a second resistor, and the first resistor and the second resistor are connected in series.
As a preferred technical scheme of the utility model, the MOS transistor comprises a MOS transistor a and a MOS transistor B, the battery voltage detection turn-off circuit is further provided with a current limiting resistor, the current limiting resistor comprises a first current limiting resistor, a second current limiting resistor, a third current limiting resistor and a fourth current limiting resistor, a first end of the first current limiting resistor is connected with the MOS transistor a, and a second end of the first current limiting resistor is grounded; the first end of the second current limiting resistor is connected with the MOS tube B, and the second end of the second current limiting resistor is grounded; the first end of the third current limiting resistor is connected with the PNP triode, and the second end of the third current limiting resistor is grounded; and the first end of the fourth current limiting resistor is connected with the POWER_ON port of the MCU, and the second end of the fourth current limiting resistor is connected with the NPN triode.
As a preferable technical scheme of the utility model, the shutdown circuit is further provided with an initialization level resistor, a first end of the initialization level resistor is connected with the power_on port of the MCU, and a second end of the initialization level resistor is grounded.
Compared with the prior art, the utility model has the following beneficial effects:
The utility model supplies POWER to MCU through the starting circuit, in the starting state, MCU sets the level of POWER_ON port high, NPN triode Q1 is conducted, so that PNP triode is conducted, then battery voltage detection circuit detects the voltage of battery, MCU starts shutdown operation when detecting the voltage of battery is too low; when the MCU is in a shutdown state, the POWER_ON port of the MCU is at a low level, the NPN triode is cut off, the grid level of the MOS tube is high, the MOS tube is cut off, and the battery voltage cannot pass through the MOS tube, so that the battery cannot provide POWER for the MCU, the MCU does not work, equipment controlled by the MCU does not work, and therefore the effects of saving electric energy and prolonging the service life of the battery are achieved.
Drawings
Fig. 1 is a schematic structural view of the present utility model.
Detailed Description
The present utility model will be described in further detail with reference to examples and drawings, but embodiments of the present utility model are not limited thereto.
In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "provided," "connected," and the like are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.
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 utility model belongs. The terminology used herein in the description of the utility model is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
The specific implementation process of the utility model is as follows:
As shown in fig. 1, the battery voltage detection shutoff circuit includes a battery; the power-on/off circuit comprises a power-on circuit and a power-off circuit; the battery voltage detection circuit is connected with the battery at the power input end and used for detecting the voltage of the battery; the MCU is connected with the battery voltage detection circuit; the starting circuit is connected with the battery and used for supplying power to the MCU; the MCU is used for receiving a detection signal of the battery voltage detection circuit and controlling the shutdown circuit to turn off a power supply of the startup circuit through the detection signal. Specifically, the battery supplies power to the MCU through the starting circuit, after the MCU is electrified and started, the battery voltage detection circuit is automatically started, the voltage of the battery is input into the battery voltage detection circuit for detection, when the MCU receives a detection signal that the battery voltage is lower than a preset threshold value, the MCU sends a shutdown signal to the shutdown circuit to shut off the power supply of the starting circuit, the battery does not supply power to the MCU, the MCU does not supply power, equipment controlled by the MCU does not work, and therefore the effects of saving electric energy and prolonging the service life of the battery are achieved. In this embodiment, the MCU controlled device may be an audio device, such as a Microphone (MIC) and an LED lamp.
In the embodiment of the utility model, the battery voltage detection turn-off circuit further comprises a turn-on/off KEY, the turn-on/off KEY comprises a diode D1, a diode D2, a battery BAT+ and a MOS tube M1, the turn-on/off KEY is respectively electrically connected with the diode D1 and the diode D2, the diode D1 is connected with a turn-on detection port POWER_KEY of the MCU, the turned-on state is detected, the turned-on diode D2 is turned on, a first output end of the battery BAT+ is connected with a source electrode of the MOS tube M1, and a drain electrode of the MOS tube M1 is connected with a POWER supply port B+ of the MCU for supplying POWER to the MCU, so that the MCU can detect the voltage of the battery.
In the embodiment of the utility model, the battery voltage detection circuit comprises a PNP type triode Q3, a diode D4 and an NPN type triode Q1, wherein the second output end of the battery BAT+ is connected with the emitter of the PNP type triode Q3, the base electrode of the PNP type triode Q3 is connected with the positive electrode of the diode D4, the negative electrode of the diode D4 is connected with the base electrode of the NPN type triode Q1, the emitter of the NPN type triode Q1 is grounded, a voltage dividing resistor is arranged between the PNP type triode Q1 and the battery BAT+, and the collector of the PNP type triode Q3 is connected with a voltage detection port BAT+V_DET of the MCU after being divided; the battery voltage detection circuit is used to detect the voltage of the battery to ensure that the battery is able to provide sufficient power during use of the device. When the battery voltage is lower than a preset threshold value, the battery voltage detection circuit sends a signal to the main control chip to prompt a user to replace the battery or charge the battery, and if the battery voltage is not in the preset threshold value, the power-off operation is started.
In the embodiment of the utility model, a POWER supply maintaining circuit port POWER_ON of the MCU is connected with a collector of an NPN triode Q1, and an emitter of the NPN triode Q1 is grounded. Specifically, the POWER supply maintaining circuit port POWER_ON of the MCU is at low potential, and the NPN triode Q1 is not conducted, so that after the MCU is shut down, the battery voltage cannot pass through the A MOS tube M1-A and the B MOS tube M1-B, and the battery can not provide POWER for the MCU.
In the embodiment of the utility model, the startup circuit further comprises a diode D3, the gate of the MOS transistor M1 is connected to the positive electrode of the diode D3, the negative electrode of the diode D3 is connected to the base electrode of the NPN transistor Q1, and the emitter electrode of the NPN transistor Q1 is grounded. Specifically, in the POWER-ON circuit, the power_on port of the MCU is at a high level, the NPN transistor Q1 is turned ON, and the voltage of the B MOS transistor M1-B is connected to the ground line through the diode D3 and the NPN transistor Q1, so that the battery bat+ remains powered ON when the POWER-ON/off key is released.
In the embodiment of the present utility model, the voltage dividing resistor includes a first voltage dividing resistor R141 and a second voltage dividing resistor R142, and the first voltage dividing resistor R141 and the second voltage dividing resistor R142 are connected in series. Specifically, the PNP transistor Q1 is turned on, so that the base potential of the PNP transistor Q3 is low, and thus the PNP transistor Q3 is turned on, so as to avoid that the voltage of the battery exceeds 3.3V and burn out the MCU, and the voltage of the battery is divided by the PNP transistor Q3 through the first voltage dividing resistor R141 and the second voltage dividing resistor R142 and then is supplied to the battery voltage detection port bat+v_det of the MCU to detect the battery voltage.
In the embodiment of the utility model, the MOS tube M1 comprises a MOS tube A M-A and a MOS tube BM1-B, the battery voltage detection shutoff circuit is also provided with a current limiting resistor, the current limiting resistor comprises a first current limiting resistor R69, a second current limiting resistor R12, a third current limiting resistor R140 and a fourth current limiting resistor R74, a first end of the first current limiting resistor R69 is connected with the MOS tube A M-A, and a second end of the first current limiting resistor R69 is grounded; the first end of the second current limiting resistor R12 is connected with the MOS tube B M-B, and the second end of the second current limiting resistor R12 is grounded; the first end of the third current limiting resistor R140 is connected with the PNP triode Q3, and the second end of the third current limiting resistor R140 is grounded; the first end of the fourth current limiting resistor R74 is connected with the POWER-maintaining circuit port POWER_ON of the MCU, and the second end of the fourth current limiting resistor R74 is connected with the NPN triode. Specifically, the first current limiting resistor R69, the second current limiting resistor R12, the third current limiting resistor R140 and the fourth current limiting resistor R74 correspond to the protection MOS transistors A M-A, MOS, the transistors B M1-B, PNP, the transistor Q3 and the transistor Q1 of NPN respectively, and are used for limiting the current of the branch circuit to prevent the components connected in series from being burnt due to excessive current.
In the embodiment of the utility model, the shutdown circuit is further provided with an initialization level resistor R81, a first end of the initialization level resistor R81 is connected with a POWER-maintaining circuit port POWER_ON of the MCU, and a second end of the initialization level resistor R81 is grounded. Specifically, when the MCU detects that the battery voltage is too low, the MCU starts the shutdown operation, in order to avoid that the level of the POWER-maintaining circuit port POWER_ON is set to be high and the NPN triode Q1 is conducted when the MUC is initialized when the shutdown operation is started, the POWER-maintaining circuit port POWER_ON of the MCU is kept to be low when the POWER-maintaining circuit port POWER_ON of the MCU is initialized through the initializing level resistor R81, and the battery is prevented from supplying POWER to the MCU under the shutdown state.
The working principle of the utility model is as follows:
When the on-off key is pressed, the diode D2 is conducted, the grid voltage of the MOS tube M1 is lower than the source voltage, the MOS tube M1 is conducted, so that a battery power supply flows from the source electrode S electrode to the drain electrode D electrode, and the drain electrodes of the MOS tube M1 are connected with the power supply port B+ of the MCU to complete the process of supplying power to the MCU by the battery. After the MCU is started, the POWER_KEY port is detected to be at a low level, the MCU sets the level of the POWER_ON port high, the voltage of the base electrode and the collector electrode of the NPN triode Q1 is higher than 0.7V, the NPN triode Q1 is conducted, the grid level of the MOS tube M1 is forced to be pulled down, and the grid of the MOS tube M1 is pulled down, so that even if a startup and shutdown KEY is released, the battery BAT+ can still supply POWER for the MCU.
NPN type triode Q1 switches on for PNP type triode Q3's base is low level, thereby PNP type triode Q3 switches on, and the battery voltage is given to MCU's BAT+V_DET port after the voltage division from PNP type triode Q3 to divider resistor divides again to detect battery voltage. When the MCU detects that the battery voltage is too low, the power_ON port of the MCU is at a low level, the NPN triode Q1 is cut off, the grid level of the MOS tube M1 is at a high level, the MOS tube M1 is cut off, the battery voltage cannot pass through the MOS tube M1, so that the battery cannot provide POWER for the MCU, the MCU does not work, and equipment controlled by the MCU does not work, thereby achieving the purpose of saving electricity.
The foregoing examples merely illustrate embodiments of the utility model and are described in more detail and are not to be construed as limiting the scope of the utility model. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the utility model, which are all within the scope of the utility model. Accordingly, the scope of protection of the present utility model is to be determined by the appended claims.
Claims (6)
1. The battery voltage detects shutdown circuit, characterized by, include:
A battery;
the power-on/off circuit comprises a power-on circuit and a power-off circuit;
The power supply input end of the battery voltage detection circuit is connected with the battery and used for detecting the voltage of the battery;
the MCU is connected with the battery voltage detection circuit;
the starting circuit is connected with the battery and used for supplying power to the MCU;
The MCU is used for receiving a detection signal of the battery voltage detection circuit and controlling the shutdown circuit to turn off a power supply of the startup circuit through the detection signal;
The battery voltage detection turn-off circuit further comprises a turn-on/off KEY, the turn-on circuit comprises a diode D1, a diode D2, a battery and an MOS tube, the turn-on/off KEY is respectively and electrically connected with the diode D1 and the diode D2, the diode D1 is connected with a POWER_KEY port of the MCU, a first output end of the battery is connected with a source electrode of the MOS tube, and a drain electrode of the MOS tube is connected with a B+ port of the MCU to supply POWER to the MCU;
The battery voltage detection circuit comprises a PNP type triode, a diode D4 and an NPN type triode, wherein the second output end of the battery is connected with the emitter of the PNP type triode, the base electrode of the PNP type triode is connected with the anode of the diode D4, the cathode of the diode D4 is connected with the base electrode of the NPN type triode, the emitter of the NPN type triode is grounded, a divider resistor is arranged between the PNP type triode and the battery, and the collector of the PNP type triode is connected with the BAT+V_DET port of the MCU after being divided.
2. The battery voltage detection shutdown circuit of claim 1 wherein the power_on port of the MCU is connected to a collector of an NPN transistor, an emitter of the NPN transistor being grounded.
3. The battery voltage detection shutdown circuit of claim 1, wherein the startup circuit further comprises a diode D3, wherein a gate of the MOS transistor is connected to an anode of the diode D3, a cathode of the diode D3 is connected to a base of an NPN transistor, and an emitter of the NPN transistor is grounded.
4. The battery voltage detection shutoff circuit of claim 1, wherein the voltage dividing resistor includes a first resistor and a second resistor, the first resistor and the second resistor being connected in series.
5. The battery voltage detection shutoff circuit of claim 1, wherein the MOS tube comprises a MOS tube a and a MOS tube B, the battery voltage detection shutoff circuit is further provided with a current limiting resistor, the current limiting resistor comprises a first current limiting resistor, a second current limiting resistor, a third current limiting resistor and a fourth current limiting resistor, a first end of the first current limiting resistor is connected with the MOS tube a, and a second end of the first current limiting resistor is grounded; the first end of the second current limiting resistor is connected with the MOS tube B, and the second end of the second current limiting resistor is grounded; the first end of the third current limiting resistor is connected with the PNP triode, and the second end of the third current limiting resistor is grounded; and the first end of the fourth current limiting resistor is connected with the POWER_ON port of the MCU, and the second end of the fourth current limiting resistor is connected with the NPN triode.
6. The battery voltage detection shutdown circuit of claim 1, further comprising an initialization level resistor, wherein a first terminal of the initialization level resistor is connected to the power_on port of the MCU, and a second terminal of the initialization level resistor is grounded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322545664.3U CN220964369U (en) | 2023-09-19 | 2023-09-19 | Battery voltage detection turn-off circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322545664.3U CN220964369U (en) | 2023-09-19 | 2023-09-19 | Battery voltage detection turn-off circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220964369U true CN220964369U (en) | 2024-05-14 |
Family
ID=91010287
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322545664.3U Active CN220964369U (en) | 2023-09-19 | 2023-09-19 | Battery voltage detection turn-off circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220964369U (en) |
-
2023
- 2023-09-19 CN CN202322545664.3U patent/CN220964369U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105720960A (en) | On-off circuit | |
| CN110994774A (en) | Power supply switching circuit | |
| CN220964369U (en) | Battery voltage detection turn-off circuit | |
| CN210780130U (en) | Power-off control circuit | |
| CN103326433A (en) | Power supply control circuit for portable device and portable monitor | |
| CN215185914U (en) | Standby zero-power-consumption circuit applied to battery power supply equipment | |
| CN115657538A (en) | MCU uninterrupted power supply circuit | |
| CN109873484A (en) | A kind of power supply circuit of clock that power down is adaptive switched and its control method | |
| CN101281419A (en) | Power supply module of computer device | |
| CN109286237B (en) | Circuit for controlling low-power-consumption backup battery to be connected or disconnected | |
| CN219892997U (en) | Lithium battery overcharge-preventing switching circuit and audio equipment | |
| CN111077980A (en) | Self-locking circuit applied to notebook computer | |
| CN218767861U (en) | Low-power-consumption control circuit for power supply of single lithium battery | |
| CN216016467U (en) | Low-voltage protection circuit, device and electrical equipment | |
| CN218352487U (en) | Low-power-consumption switching-on and switching-off circuit | |
| CN217984625U (en) | Mechanical switch normally closed state disconnection back-stage power supply control circuit | |
| CN212991994U (en) | Battery pack and electric tool | |
| CN219268834U (en) | Automatic shutdown control circuit | |
| CN210404789U (en) | Power self-locking circuit and printer with same | |
| CN216649315U (en) | Power supply circuit | |
| CN216959371U (en) | Charging activation circuit and power supply system | |
| CN216697198U (en) | Startup and shutdown control circuit | |
| CN213847095U (en) | Dormancy circuit and lighting device | |
| CN211831276U (en) | LED drive circuit with battery under-voltage protection | |
| CN214506541U (en) | Battery over-discharge protection circuit and power supply device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |