CN111538370B - Power supply circuit and power supply method for RTC - Google Patents
Power supply circuit and power supply method for RTC Download PDFInfo
- Publication number
- CN111538370B CN111538370B CN202010440087.XA CN202010440087A CN111538370B CN 111538370 B CN111538370 B CN 111538370B CN 202010440087 A CN202010440087 A CN 202010440087A CN 111538370 B CN111538370 B CN 111538370B
- Authority
- CN
- China
- Prior art keywords
- power supply
- capacitor
- transistor
- rtc
- module
- 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
Images
Classifications
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
- G06F1/04—Generating or distributing clock signals or signals derived directly therefrom
- G06F1/14—Time supervision arrangements, e.g. real time clock
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
- G06F1/26—Power supply means, e.g. regulation thereof
- G06F1/266—Arrangements to supply power to external peripherals either directly from the computer or under computer control, e.g. supply of power through the communication port, computer controlled power-strips
Landscapes
- Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Direct Current Feeding And Distribution (AREA)
Abstract
The application discloses a power supply circuit and a power supply method for an RTC (real time clock), which are used for enabling a user to be free from manually replacing a battery and simplifying user operation. The power supply circuit includes: the first input end is connected with the output end of an external power supply and used for receiving the power supply of the external power supply; the second input end is connected with the equipment battery and used for receiving the power supply of the equipment battery; the output end is connected with an RTC in the equipment and used for supplying power to the RTC; the first capacitor is connected with the first input end and the second input end respectively, is connected with the output end and is used for charging under the condition that external current flows into the first input end or the second input end, and the RTC is supplied with power through the output end under the condition that no external current flows into the first input end and the second input end. Adopt the power supply circuit that this application provided, replace the RTC battery through first electric capacity, make the user need not manual change battery, simplified user operation.
Description
Technical Field
The present application relates to the field of computers, and in particular, to a power supply circuit and a power supply method for an RTC.
Background
RTC (Real Time Clock) is one of the most widely used consumer electronics products in daily life. The real-time clock mainly adopts a crystal oscillator with higher precision as a clock source at present, and can work when a main power supply is powered off, and the crystal oscillator needs to be powered by an external battery.
Therefore, how to increase the endurance time of the RTC is an urgent technical problem to be solved, so that the user does not need to manually replace the battery, and the user operation is simplified.
Disclosure of Invention
An object of the embodiments of the present application is to provide a power supply circuit and a power supply method for an RTC, so that a user does not need to manually replace a battery, and user operations are simplified.
In order to solve the technical problem, the embodiment of the application adopts the following technical scheme: a power supply circuit comprising:
the first input end is connected with the output end of an external power supply and used for receiving the power supply of the external power supply;
the second input end is connected with the equipment battery and used for receiving the power supply of the equipment battery;
the output end is connected with an RTC in the equipment and used for supplying power to the RTC;
the first capacitor is connected with the first input end and the second input end respectively, is connected with the output end and is used for charging under the condition that external current flows into the first input end or the second input end, and the RTC is supplied with power through the output end under the condition that no external current flows into the first input end and the second input end.
The beneficial effect of this application lies in: in the power supply circuit, contain first electric capacity, respectively with first input with the second input is connected, and with the output is connected, can charge under the circumstances that first input or second input have external current to flow in first input and second input do not all have external current to flow in the circumstances through the output is RTC power supply to replace the RTC battery through first electric capacity, and charge for first electric capacity through external power supply or equipment battery, and under the circumstances of equipment external power supply or equipment battery disconnection, first electric capacity becomes the discharge state, for RTC power supply through the output, thereby replace the RTC battery through first electric capacity, make the user need not manual change battery, simplified user operation.
In one embodiment, the power supply circuit further comprises:
a power management chip, the unit management chip comprising: a power input pin, an enable pin and a power output pin;
the power input pin is respectively connected with the first input end and the second input end and used for receiving current input by the first input end or the second input end;
the enabling pin is used for activating the power management chip;
and the power supply output pin is connected with the first capacitor and used for charging the first capacitor.
In one embodiment, the power supply circuit further comprises:
the reset module is used for changing the electric potential from a high level to a low level when being triggered.
In one embodiment, the power supply circuit further comprises:
the first discharging module is connected with the first capacitor and used for discharging the first capacitor;
the second discharging module is connected with the first capacitor, connected with the resetting module and used for discharging the first capacitor when the potential is changed from the high level to the low level.
In one embodiment, the power supply circuit further comprises:
and the filtering module is positioned between the output pin of the power management chip and the first capacitor and is used for filtering the voltage of the first capacitor.
In one embodiment, the filtering module includes: a second capacitor, a diode and a resistor;
the second capacitor is used for filtering voltage signals lower than a preset frequency;
the resistor is used for filtering voltage signals higher than a preset frequency;
the diode is used for preventing reverse bias current from being generated and preventing the current generated by the first capacitor from flowing to the resistor when the first capacitor is in a discharge state.
In one embodiment, the power supply circuit further comprises:
and the current limiting module is positioned between the first discharging module and the first capacitor and used for limiting the current of the first capacitor and the current output from the output pin to the first discharging module.
In one embodiment, the power supply circuit further comprises:
and the voltage stabilizing module is connected with the current limiting module and used for stabilizing the voltage in the first discharging module.
The present application also discloses a power supply method for an RTC, which is used for a device including the power supply circuit introduced in the above embodiment, and includes:
under the condition that the equipment containing the power supply circuit receives external power supply, respectively supplying power to a local system and the power supply circuit;
under the condition that external current flows into the power supply circuit, power is respectively supplied to a first capacitor and an RTC in the power supply circuit;
and under the condition of not receiving external power supply, supplying power to the RTC through the first capacitor.
In one embodiment, the power supply method for RTC further includes:
receiving a triggering operation of a reset button;
discharging the first capacitance for the trigger operation.
Drawings
Fig. 1 is a schematic structural diagram of a power supply circuit disclosed in an embodiment of the present application;
FIG. 2 is a schematic circuit diagram of a device battery disclosed in an embodiment of the present application;
fig. 3 is a power supply method for an RTC according to an embodiment of the present application;
fig. 4 is a power supply method for an RTC according to another embodiment of the present application.
Detailed Description
Various aspects and features of the present application are described herein with reference to the drawings.
It will be understood that various modifications may be made to the embodiments of the present application. Accordingly, the foregoing description should not be construed as limiting, but merely as exemplifications of embodiments. Those skilled in the art will envision other modifications within the scope and spirit of the application.
The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the application and, together with a general description of the application given above and the detailed description of the embodiments given below, serve to explain the principles of the application.
These and other characteristics of the present application will become apparent from the following description of preferred forms of embodiment, given as non-limiting examples, with reference to the attached drawings.
It is also understood that, although the present application has been described with reference to some specific examples, a person of skill in the art shall certainly be able to achieve many other equivalent forms of application, having the characteristics as set forth in the claims and hence all coming within the field of protection defined thereby.
The above and other aspects, features and advantages of the present application will become more apparent in view of the following detailed description when taken in conjunction with the accompanying drawings.
Specific embodiments of the present application are described hereinafter with reference to the accompanying drawings; however, it is to be understood that the disclosed embodiments are merely exemplary of the application, which can be embodied in various forms. Well-known and/or repeated functions and constructions are not described in detail to avoid obscuring the application of the invention in unnecessary or unnecessary detail. Therefore, specific structural and functional details disclosed herein are not to be interpreted as limiting, but merely as a basis for the claims and as a representative basis for teaching one skilled in the art to variously employ the present application in virtually any appropriately detailed structure.
The specification may use the phrases "in one embodiment," "in another embodiment," "in yet another embodiment," or "in other embodiments," which may each refer to one or more of the same or different embodiments in accordance with the application.
Fig. 1 is a schematic structural diagram of a power supply circuit according to an embodiment of the present application, and as shown in fig. 1, the power supply circuit includes:
the first input end is connected with the output end of an external power supply and used for receiving the power supply of the external power supply;
the first input terminal is + V _ VSYS shown in fig. 1, and is connected to the input terminal of the external power supply for receiving the power supplied by the external power supply. The external power supply may be mains electricity.
The second input end is connected with the equipment battery and used for receiving the power supply of the equipment battery;
the second input terminal is + V _ VBATTERY _ RTC shown in fig. 1, and is connected to the device battery and configured to receive power supplied by the device battery; since the RTC in this application can receive power supplied by the device battery, it needs to be modified based on the conventional device battery, fig. 2 is a schematic circuit diagram of the device battery of this application, as shown in fig. 2, the power management chip in the device battery divides two paths of power, one path of power is used to supply power to the system in the device, i.e., + V _ VBATTERY shown in fig. 2, the other path of power is used to supply power to the RTC, i.e., + V _ VBATTERY shown in fig. 2, and + V _ VBATTERY shown in fig. 2 is a specific output terminal additionally provided to the device battery and connected to + V _ VBATTERY shown in fig. 1, i.e., + V _ VBATTERY shown in fig. 2 flows to + V _ VBATTERY shown in fig. 1.
The output end is connected with an RTC in the equipment and used for supplying power to the RTC;
the output end is + VCCRTC _ VBKUP shown in fig. 1, and is connected to an RTC in the device, and when the output end is used for supplying an external current to the first input end or the second input end, the RTC can be supplied with power.
That is to say, among the power supply circuit, no matter first input and second input have external current to flow in, all can supply power to the RTC, only when first input or second input have external current to flow in, first input or second input supply power to the RTC, if the electric quantity in the first electric capacity is not full, the external current that first input or second input flowed in also can charge to first electric capacity, when first input and second input do not have external current to flow in, first electric capacity becomes discharge state by the charged state, supply power to the RTC through first electric capacity.
In addition, when the power supply circuit is used for electronic equipment such as a notebook computer, a mobile terminal and the like, the power supply circuit can be arranged on the mainboard, and when the power supply circuit is arranged on the mainboard, the occupied space layout is very small. And the lithium cell has certain thickness, and the power supply circuit that this application disclosed sets up behind the mainboard, compares in the thickness of lithium cell, and the thickness of this power supply circuit can be ignored almost, consequently, can reduce notebook computer or mobile terminal thickness to a certain extent.
The beneficial effect of this application lies in: in the power supply circuit, contain first electric capacity, respectively with first input with the second input is connected, and with the output is connected, can charge under the circumstances that first input or second input have external current to flow in first input and second input do not all have external current to flow in the circumstances through the output is the RTC power supply to replace the RTC battery through first electric capacity, and charge for first electric capacity through external power supply or equipment battery, and under the circumstances of equipment external power supply or equipment battery disconnection, first electric capacity becomes the discharge state, is the RTC power supply through the output, thereby replace the RTC battery through first electric capacity, make the user need not manual change battery, simplify user operation.
In one embodiment, the power supply circuit further comprises:
a power management chip, the unit management chip comprising: a power input pin, an enable pin and a power output pin; as shown in fig. 1, the power input pin is the VIN pin in fig. 1, the enable pin is the EN pin in fig. 1, and the power output pin is the OUT pin in fig. 1.
The power input pin is respectively connected with the first input end and the second input end and used for receiving current input by the first input end or the second input end;
the enabling pin is used for activating the power management chip;
and the power supply output pin is connected with the first capacitor and used for charging the first capacitor.
In one embodiment, the power supply circuit further comprises:
the reset module is used for changing the electric potential from a high level to a low level when being triggered.
The RESET module is RESET _ SW _ R shown in fig. 1, and when triggered, the voltage level changes from high level to low level. Thereby causing the transistor PQ6301 in the second discharge module to turn on the specific PN junction in fig. 1 (2 and 3 of PQ 6301) to discharge the first capacitor.
In one embodiment, the power supply circuit further comprises:
the first discharging module is connected with the first capacitor and used for discharging the first capacitor;
the second discharging module is connected with the first capacitor, connected with the resetting module and used for discharging the first capacitor when the potential is changed from the high level to the low level.
Sometimes, when the notebook needs to leave the factory or needs to be repaired, the notebook needs to be reset to restore the notebook to the factory setting, the factory leaving mode which can be recovered or not is marked by whether the electric quantity of the first capacitor is emptied or not, the factory leaving mode can not be recovered without emptying the electric quantity of the first capacitor, therefore, as shown in fig. 1, the first discharging module is composed of a transistor PQ6302 and a capacitor PC6304, wherein, the application is provided with a first discharging module and a second discharging module, under the condition of not resetting, the charge of the first capacitor PC6030 is slowly discharged through the first discharging module (i.e. PQ6302 and PC6304 shown in fig. 1), when the RESET key RESET _ SW _ R is pressed, the potential changes from high to low, and at this time, specific PN junctions of PQ6032 and PQ6301 are turned on (lines corresponding to 2 and 3 of PQ6032 and PQ6301 shown in fig. 1 are turned on), thereby performing a quick discharge. To reduce the discharge time of the first capacitor.
In one embodiment, the power supply circuit further comprises:
and the filtering module is positioned between the output pin of the power management chip and the first capacitor and is used for filtering the voltage of the first capacitor.
In one embodiment, the filtering module includes: a second capacitor, a diode and a resistor;
the second capacitor is PC6302 in fig. 1, the diode is PD6301 in fig. 1, and the resistor is PR6301 in fig. 1. The second capacitor PC6302 is used for filtering out voltage signals lower than a preset frequency; the resistor PR6301 is used for filtering a voltage signal higher than a preset frequency; the diode PD6301 is used to prevent reverse bias current from being generated and to prevent the current generated by the first capacitor from flowing to the resistor when the first capacitor is in a discharge state.
In one embodiment, the power supply circuit further comprises:
the current limiting module is a resistor, which is PR2608 shown in fig. 1, and is located between the first discharging module and the first capacitor, and configured to limit current of the first capacitor and the output pin to the first discharging module.
In one embodiment, the power supply circuit further comprises:
and the voltage stabilizing module is a capacitor, namely the PC6304 shown in figure 1, and is connected with the current limiting module and used for stabilizing the voltage in the first discharging module.
Fig. 3 is a power supply method for an RTC according to an embodiment of the present application, for an apparatus including the power supply circuit described in the above embodiment, and as shown in fig. 3, the power supply method for an RTC includes the following steps S31-S33:
in step S31, in the case where the device including the power supply circuit accepts external power supply, power supply operations are performed to the local system and the power supply circuit, respectively;
in step S32, when an external current flows into the power supply circuit, power is supplied to the first capacitor and the RTC in the power supply circuit, respectively;
in step S33, when the external power supply is not received, the RTC is supplied with power through the first capacitor.
Under the condition that the equipment comprising the power supply circuit receives external power supply, power supply operation is respectively carried out on the local system and the power supply circuit; for example, when the device is connected to a power supply, a power supply operation is performed to the local system and the power supply circuit. Of course, if the device is not connected to a power source, but is installed with a device battery, power supply operation is performed to the local system and the power supply circuit. Under the condition that external current flows into the power supply circuit, power is respectively supplied to a first capacitor and an RTC in the power supply circuit; thereby charging the first capacitor with an external current while supplying the RTC. In the case of not receiving external power supply, that is, in the case of no device connected to the power supply and no device battery installed, the RTC is supplied with power through the first capacitor.
In one embodiment, as shown in fig. 4, the power supply method for the RTC further includes:
in step S41, a trigger operation of the reset button is received;
in step S42, the first capacitor is discharged for a trigger operation.
Sometimes, when the notebook needs to leave a factory or needs to be maintained, the notebook needs to be reset, so that the notebook is reset to the factory setting, and the factory mode that can be restored is marked by whether the electric quantity of the first capacitor is emptied, and the electric quantity of the first capacitor cannot be restored to the factory mode without emptying. Thereby discharging the first capacitor shown in fig. 1.
The above embodiments are only exemplary embodiments of the present application, and are not intended to limit the present application, and the protection scope of the present application is defined by the claims. Various modifications and equivalents may be made by those skilled in the art within the spirit and scope of the present application and such modifications and equivalents should also be considered to be within the scope of the present application.
Claims (7)
1. A power supply circuit, comprising:
the first input end is connected with the output end of an external power supply and used for receiving the power supply of the external power supply;
the second input end is connected with the equipment battery and used for receiving the power supply of the equipment battery;
the output end is connected with an RTC in the equipment and used for supplying power to the RTC;
the first capacitor is respectively connected with the first input end and the second input end, is connected with the output end, and is used for charging when external current flows into the first input end or the second input end, and supplies power to the RTC through the output end when no external current flows into the first input end and the second input end;
wherein the power supply circuit further comprises:
the reset module is used for changing the potential from a high level to a low level when being triggered;
the first discharging module is connected with the first capacitor and used for discharging the first capacitor;
the second discharging module is connected with the first capacitor, connected with the resetting module and used for discharging the first capacitor when the potential is changed from a high level to a low level;
the second discharging module comprises a transistor PQ6301, a transistor PQ6302 and a capacitor PC6304, wherein the drain of the transistor PQ6301 is connected to the first input terminal and the second input terminal, the source of the transistor PQ6301 is grounded, the gate of the transistor PQ6301 is connected to the reset module, the drain of the transistor PQ6302 is connected to the first capacitor, the source of the transistor PQ6302 is grounded, the gate of the transistor PQ6302 is connected between the second input terminal and the drain of the transistor PQ6301, one end of the capacitor PC6304 is connected to the gate of the transistor PQ6302, and the other end of the capacitor PC6304 is grounded.
2. The circuit of claim 1, wherein the power supply circuit further comprises:
a power management chip, the power management chip comprising: a power input pin, an enable pin and a power output pin;
the power input pin is respectively connected with the first input end and the second input end and used for receiving current input by the first input end or the second input end;
the enabling pin is used for activating the power management chip;
and the power supply output pin is connected with the first capacitor and used for charging the first capacitor.
3. The circuit of claim 1, wherein the power supply circuit further comprises:
and the filtering module is positioned between an output pin of the power management chip and the first capacitor and is used for filtering the voltage of the first capacitor.
4. The circuit of claim 3, wherein the filtering module comprises: a second capacitor, a diode and a resistor;
the second capacitor is used for filtering voltage signals lower than a preset frequency;
the resistor is used for filtering voltage signals higher than a preset frequency;
the diode is used for preventing reverse bias current from being generated and preventing the current generated by the first capacitor from flowing to the resistor when the first capacitor is in a discharge state.
5. The circuit of claim 1, wherein the power supply circuit further comprises:
and the current limiting module is positioned between the first discharging module and the first capacitor and used for limiting the current of the first capacitor and the current output from the output pin to the first discharging module.
6. The circuit of claim 1, wherein the power supply circuit further comprises:
and the voltage stabilizing module is connected with the current limiting module and used for stabilizing the voltage in the first discharging module.
7. A power supply method for RTC, for a device comprising the power supply circuit of claim 1, comprising:
under the condition that the equipment containing the power supply circuit receives external power supply, respectively supplying power to a local system and the power supply circuit;
under the condition that external current flows into the power supply circuit, power is respectively supplied to a first capacitor and an RTC in the power supply circuit;
under the condition of not accepting external power supply, supplying power to the RTC through the first capacitor;
wherein the power supply method for the RTC further comprises:
receiving a triggering operation of a reset button through a reset module;
discharging the first capacitance for the trigger operation;
wherein discharging the first capacitance for the trigger operation comprises:
in response to the trigger operation, the potential of the reset module changes from a high level to a low level;
in response to the reset module changing from a high level to a low level, a second discharging module connected with the reset module discharges the first capacitor;
the second discharging module includes a transistor PQ6301, a transistor PQ6302 and a capacitor PC6304, a drain of the transistor PQ6301 is connected to the first input terminal and the second input terminal, a source of the transistor PQ6301 is grounded, a gate of the transistor PQ6301 is connected to the reset module, a drain of the transistor PQ6302 is connected to the first capacitor, a source of the transistor PQ6302 is grounded, a gate of the transistor PQ6302 is connected between the second input terminal and the drain of the transistor PQ6301, one end of the capacitor PC6304 is connected to the gate of the transistor PQ6302, and the other end of the capacitor PC6304 is grounded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010440087.XA CN111538370B (en) | 2020-05-21 | 2020-05-21 | Power supply circuit and power supply method for RTC |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010440087.XA CN111538370B (en) | 2020-05-21 | 2020-05-21 | Power supply circuit and power supply method for RTC |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111538370A CN111538370A (en) | 2020-08-14 |
| CN111538370B true CN111538370B (en) | 2022-04-08 |
Family
ID=71974695
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010440087.XA Active CN111538370B (en) | 2020-05-21 | 2020-05-21 | Power supply circuit and power supply method for RTC |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111538370B (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106356987A (en) * | 2016-09-20 | 2017-01-25 | 北京机械设备研究所 | RTC (real time clock) circuit |
| CN207992869U (en) * | 2018-01-19 | 2018-10-19 | 长沙瑞腾信息技术有限公司 | A kind of device extending the main board for notebook computer button cell service life |
| CN111025887A (en) * | 2019-12-19 | 2020-04-17 | 深圳市创维群欣安防科技股份有限公司 | RTC circuit and RTC electronic product of circulation power supply |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9203265B2 (en) * | 2010-09-21 | 2015-12-01 | Intel Corporation | Power supply |
-
2020
- 2020-05-21 CN CN202010440087.XA patent/CN111538370B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106356987A (en) * | 2016-09-20 | 2017-01-25 | 北京机械设备研究所 | RTC (real time clock) circuit |
| CN207992869U (en) * | 2018-01-19 | 2018-10-19 | 长沙瑞腾信息技术有限公司 | A kind of device extending the main board for notebook computer button cell service life |
| CN111025887A (en) * | 2019-12-19 | 2020-04-17 | 深圳市创维群欣安防科技股份有限公司 | RTC circuit and RTC electronic product of circulation power supply |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111538370A (en) | 2020-08-14 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN201608557U (en) | Power supply circuit for mobile phone | |
| JP3887093B2 (en) | Display device | |
| CN207782762U (en) | A kind of automatic reset circuit and electronic product | |
| CN112886664A (en) | Electronic device | |
| US6931554B2 (en) | Add-on card for wireless communication with power-managing circuit | |
| CN111884303B (en) | Charging control circuit, charging control method and electronic device | |
| CN102346529B (en) | Power supply control circuit | |
| CN111538370B (en) | Power supply circuit and power supply method for RTC | |
| CN117293972A (en) | Protection circuit for preventing battery equipment from overdischarging | |
| US20230318327A1 (en) | Stylus | |
| CN217467616U (en) | Power supply control circuit and electronic device | |
| US20100275041A1 (en) | Computer power supply and power status signal generating circuit thereof | |
| CN111934661B (en) | Startup and shutdown control circuit | |
| CN113676166B (en) | Battery low-voltage automatic cut-off circuit and working method thereof | |
| CN113872265A (en) | Power management circuit | |
| CN216118554U (en) | Clock circuit, mainboard and computer equipment | |
| CN111399617A (en) | Power supply control device and electronic apparatus | |
| JPH09264971A (en) | Electric power controller, electricity generating apparatus and electronic equipment | |
| CN208939622U (en) | Boosting battery discharge circuit and communication equipment | |
| CN219372046U (en) | Power supply system of IOT equipment without entity keys | |
| CN218633389U (en) | Battery protection circuit and power supply circuit | |
| CN117543759A (en) | Power supply control circuit and power supply control system | |
| CN216290254U (en) | Standby power supply circuit and electronic device | |
| CN113904436B (en) | Power management circuit | |
| CN218997754U (en) | Backup power supply device based on super capacitor |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |