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CN118336891A - Self-starting power supply system, self-starting power supply chip, method and electronic equipment - Google Patents

Self-starting power supply system, self-starting power supply chip, method and electronic equipment Download PDF

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Publication number
CN118336891A
CN118336891A CN202410454976.XA CN202410454976A CN118336891A CN 118336891 A CN118336891 A CN 118336891A CN 202410454976 A CN202410454976 A CN 202410454976A CN 118336891 A CN118336891 A CN 118336891A
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CN
China
Prior art keywords
power supply
voltage
circuit
power
supply voltage
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.)
Pending
Application number
CN202410454976.XA
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Chinese (zh)
Inventor
张家豪
屈熹
陈林峰
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Zhuhai Nanxin Semiconductor Technology Co ltd
Original Assignee
Zhuhai Nanxin Semiconductor Technology Co ltd
Priority date (The priority date 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 date listed.)
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Application filed by Zhuhai Nanxin Semiconductor Technology Co ltd filed Critical Zhuhai Nanxin Semiconductor Technology Co ltd
Priority to CN202410454976.XA priority Critical patent/CN118336891A/en
Publication of CN118336891A publication Critical patent/CN118336891A/en
Pending legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
    • H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
    • H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/32—Means for protecting converters other than automatic disconnection

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Direct Current Feeding And Distribution (AREA)

Abstract

The application provides a self-starting power supply system, a chip, a method and electronic equipment. The self-starting power supply system comprises: the device comprises a first linear voltage stabilizing circuit, an anti-reverse-filling circuit, a power supply selection circuit and a voltage output circuit. The first power supply voltage is converted through the first linear voltage stabilizing circuit, and the converted first power supply voltage is transmitted to the power supply selection circuit and the anti-reverse-filling circuit. The power supply selection circuit selects a target power supply voltage between the converted first power supply voltage and the converted second power supply voltage, and transmits the target power supply voltage to the voltage output circuit so that the voltage output circuit outputs the power supply voltage. The anti-reverse-filling circuit determines whether to connect the voltage output circuit and the power pin according to the converted first power voltage and second power voltage. When the anti-reverse-filling circuit is not communicated with the voltage output circuit and the power supply pin, the reverse filling of the second power supply voltage to the voltage output circuit can be avoided. Therefore, the self-starting power supply system can support single-power supply and double-power supply.

Description

Self-starting power supply system, self-starting power supply chip, method and electronic equipment
Technical Field
The present application relates to the field of integrated circuits, and in particular, to a self-starting power supply system, a self-starting power supply chip, a method, and an electronic device.
Background
Chips such as power converters and data converters are widely used in various fields such as communication devices, medical devices, and automotive electronic systems. Currently, there are two power supply modes, in which a power supply voltage VCC can be provided to a power supply pin of a chip to enable the chip to operate.
In one mode, a single power supply supplies power, and the voltage Vin of the single power supply passes through a built-in power supply, a bias circuit and a reference circuit of a power supply system, and then a low dropout linear regulator (low-dropout regulator, LDO) of the power supply system supplies power supply voltage VCC to a power supply pin of a chip to serve as a power domain of the power supply pin.
In the second mode, the dual power supplies power, and the two voltages Vin and VDD of the dual power supply can supply the power supply voltage VCC to the power supply pins of the chip.
However, the two power supply modes are inconvenient to flexibly select. Based on this, there is a need for a self-starting power supply system that supports both single power supply and dual power supply.
Disclosure of Invention
The application provides a self-starting power supply system, a self-starting power supply chip, a method and electronic equipment, which can support both single power supply and double power supply.
In a first aspect, the present application provides a self-starting power supply system. The self-starting power supply system comprises: the device comprises a first linear voltage stabilizing circuit, an anti-reverse-filling circuit, a power supply selection circuit and a voltage output circuit.
The input end of the first linear voltage stabilizing circuit and the power end of the voltage output circuit are used for being connected with a first power voltage, the output end of the first linear voltage stabilizing circuit is electrically connected with the first input end of the power selecting circuit and the first end of the anti-reverse-filling circuit respectively, the second input end of the power selecting circuit is electrically connected with a power pin, the output end of the power selecting circuit is electrically connected with the input end of the voltage output circuit, the output end of the voltage output circuit is electrically connected with the second end of the anti-reverse-filling circuit, and the third end of the anti-reverse-filling circuit is electrically connected with the power pin of the chip to be powered.
The first linear voltage stabilizing circuit is used for converting the first power supply voltage and transmitting the converted first power supply voltage to the power supply selection circuit and the anti-reverse-filling circuit.
And the power supply selection circuit is used for selecting the target power supply voltage between the converted first power supply voltage and the second power supply voltage from the second power supply voltage acquired from the power supply pin and transmitting the target power supply voltage to the voltage output circuit.
And the anti-reverse-filling circuit is used for determining whether to connect the voltage output circuit and the power pin according to the converted first power supply voltage and the converted second power supply voltage.
And the voltage output circuit is used for providing a power supply voltage for the chip to be powered when the anti-reverse-filling circuit is communicated with the voltage output circuit and the power supply pin according to the target power supply voltage.
Through the self-starting power supply system provided by the first aspect, the first linear voltage stabilizing circuit can convert the first power supply voltage and transmit the converted first power supply voltage to the power supply selection circuit and the anti-reverse-filling circuit, so that the power supply selection circuit and the anti-reverse-filling circuit can acquire the converted first power supply voltage. The power supply selection circuit may select the target power supply voltage between the converted first power supply voltage and the second power supply voltage according to the second power supply voltage acquired from the power supply pin and according to the establishment condition of the second power supply voltage. The power supply selection circuit may transmit the target power supply voltage to the voltage output circuit, so that the voltage output circuit may output the power supply voltage. The anti-reverse-filling circuit can determine whether to connect the voltage output circuit and the power pin according to the converted first power voltage and second power voltage. Therefore, when the self-starting power supply system is under dual-power supply, the anti-reverse-filling circuit is not communicated with the voltage output circuit and the power supply pin, the reverse filling of the second power supply voltage to the voltage output circuit can be avoided, and the dual power supplies can be completely independent. Therefore, the self-starting power supply system can support single-power supply and double-power supply.
In one possible design, the power supply selection circuit includes: the first power-on reset module and the channel selection module.
The input end of the first power-on reset module and the first input end of the channel selection module are electrically connected with the power supply pin, the output end of the first power-on reset module is electrically connected with the control end of the channel selection module, and the second input end of the channel selection module is electrically connected with the output end of the first linear voltage stabilizing circuit.
The first power-on reset module is used for detecting the establishment condition of the second power supply voltage according to a first preset voltage to obtain a first detection signal, and transmitting the first detection signal to the channel selection module, wherein the first preset voltage is used for determining the voltage value of the second power supply voltage, and the establishment condition comprises established and unessential.
The channel selection module is used for selecting the target power supply voltage as the converted first power supply voltage or second power supply voltage under the action of the first detection signal.
In one possible design, the voltage output circuit includes: the second power-on reset module, the band gap reference module and the second linear voltage stabilizing circuit.
The input end of the second power-on reset module is electrically connected with the output end of the power supply selection circuit, the output end of the second power-on reset module is electrically connected with the input end of the band gap reference module and the first input end of the second linear voltage stabilizing circuit respectively, the output end of the band gap reference module is electrically connected with the second input end of the second linear voltage stabilizing circuit, the power supply end of the second linear voltage stabilizing circuit is used for being connected with the first power supply voltage, and the output end of the second linear voltage stabilizing circuit is electrically connected with the second end of the anti-reverse-filling circuit.
The second power-on reset module is used for detecting the establishment condition of the target power supply voltage according to a second preset voltage to obtain a second detection signal, and transmitting the second detection signal to the band gap reference module and the second linear voltage stabilizing circuit, wherein the second preset voltage is used for determining the voltage value of the target power supply voltage.
And the band gap reference module is used for generating a reference voltage under the action of the second detection signal and transmitting the reference voltage to the second linear voltage stabilizing circuit.
The second linear voltage stabilizing circuit is used for generating a power supply voltage according to the reference voltage under the action of a second detection signal, and transmitting the power supply voltage to the chip to be powered when the anti-reverse-filling circuit is communicated with the voltage output circuit and the power supply pin.
In one possible design, the anti-reverse-fill circuit includes: an isolation module and a switch tube module.
The input end of the isolation module is electrically connected with the output end of the first linear voltage stabilizing circuit, the output end of the isolation module is electrically connected with the first end of the switching tube module, the second end of the switching tube module is electrically connected with the output end of the voltage output circuit, and the third end of the switching tube module is electrically connected with the power pin.
The isolation module is used for detecting the establishment condition of the converted first power supply voltage according to a third preset voltage to obtain a third detection signal, transmitting the third detection signal to the switching tube module, and determining the voltage value of the converted first power supply voltage by the third preset voltage.
And the switching tube module is used for determining whether the voltage output circuit and the power pin are communicated or not according to the comparison result of the first power voltage and the second power voltage under the action of the third detection signal.
In one possible design, the switching tube module is specifically configured to connect the voltage output circuit and the power pin when the first power voltage after the third detection signal indicates that the converted first power voltage is established and the first power voltage is greater than the second power voltage.
In one possible design, the switching tube module is specifically configured to not connect the voltage output circuit and the power pin when the third detection signal indicates that the converted first power voltage is not established and/or the first power voltage is smaller than the second power voltage.
In one possible design, the supply voltage is less than the second supply voltage.
In a second aspect, the present application provides a self-starting power supply chip, including: the first aspect described above and the self-starting power supply system in each possible design of the first aspect described above.
The advantages of the self-starting power supply chip provided in the second aspect and the possible designs of the second aspect may be referred to the advantages brought by the possible embodiments of the first aspect and the possible embodiments of the first aspect, and are not described herein again.
In a third aspect, the present application provides a self-starting power supply method applied to the self-starting power supply system in the first aspect and each possible design of the first aspect, the method comprising:
The first linear voltage stabilizing circuit converts the first power supply voltage and transmits the converted first power supply voltage to the power supply selecting circuit and the anti-reverse-filling circuit.
The power supply selection circuit selects a target power supply voltage from the second power supply voltage acquired by the power supply pin between the converted first power supply voltage and the second power supply voltage, and transmits the target power supply voltage to the voltage output circuit.
The anti-reverse-filling circuit determines whether to connect the voltage output circuit and the power pin according to the converted first power voltage and second power voltage.
And the voltage output circuit provides a power supply voltage for the chip to be powered when the anti-reverse-filling circuit is communicated with the voltage output circuit and the power supply pin according to the target power supply voltage.
In a fourth aspect, the present application provides an electronic device comprising: the chip in the second aspect described above.
Drawings
Fig. 1 is a schematic structural diagram of a self-starting power supply system according to an embodiment of the present application;
FIG. 2 is a schematic flow chart of a self-starting power supply method according to an embodiment of the present application;
Fig. 3 is a schematic structural diagram of another self-starting power supply system according to an embodiment of the present application.
Detailed Description
In the present application, "at least one" means one or more, and "a plurality" means two or more. "and/or", describes an association relationship of an association object, and indicates that there may be three relationships, for example, a and/or B, and may indicate: a alone, a and B together, and B alone, wherein a, B may be singular or plural. The character "/" generally indicates that the context-dependent object is an "or" relationship. "at least one of" or the like means any combination of these items, including any combination of single item(s) or plural items(s). For example, at least one (one) of a, b, or c alone may represent: a alone, b alone, c alone, a combination of a and b, a combination of a and c, b and c, or a combination of a, b and c, wherein a, b, c may be single or plural. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
The terms "center," "longitudinal," "transverse," "upper," "lower," "left," "right," "front," "rear," and the like refer to an orientation or positional relationship based on that shown in the drawings, merely for convenience of description and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the application.
The terms "connected," "connected," and "connected" are to be construed broadly, and may refer to, for example, electrical or signal connections in addition to physical connections, e.g., direct connections, i.e., physical connections, or indirect connections via at least one element therebetween, such as long as electrical circuit communication is achieved, and communications within two elements; signal connection may refer to signal connection through a medium such as radio waves, in addition to signal connection through a circuit. The specific meaning of the above terms in the present application will be understood in specific cases by those of ordinary skill in the art.
The application provides a self-starting power supply system, a chip, a method and electronic equipment.
The self-starting power supply system can be a chip or a circuit module.
In the present application, the electronic device may include, but is not limited to: cell phones, robots, televisions, tablet computers, and the like.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a self-starting power supply system according to an embodiment of the present application. As shown in fig. 1, the self-starting power supply system 100 may include: a first linear voltage regulator circuit 110, an anti-reverse-current circuit 120, a power supply selection circuit 130, and a voltage output circuit 140.
The first linear voltage stabilizing circuit 110, the anti-reverse-filling circuit 120, the power supply selecting circuit 130 and the voltage output circuit 140 may be separately arranged or may be integrally arranged.
The input end of the first linear voltage stabilizing circuit 110 and the power end of the voltage output circuit 140 are both used for accessing a first power voltage Vin, the output end of the first linear voltage stabilizing circuit 110 is electrically connected with the first input end of the power selecting circuit 130 and the first end of the anti-reverse-filling circuit 120 respectively, the second input end of the power selecting circuit 130 is electrically connected with the power pin V of the chip to be powered, the output end of the power selecting circuit 130 is electrically connected with the input end of the voltage output circuit 140, the output end of the voltage output circuit 140 is electrically connected with the second end of the anti-reverse-filling circuit 120, and the third end of the anti-reverse-filling circuit 120 is electrically connected with the power pin V.
The chip to be powered may be a power converter or a data converter, which is not particularly limited in the embodiment of the present application.
In some examples, the first linear voltage regulator circuit 110 is an integrated linear voltage regulator circuit (INTEGRATED LOW DROPOUT REGULATOR MODULE, intLDO).
Next, referring to fig. 2, fig. 2 is a flow chart of a self-starting power supply method according to an embodiment of the application. As shown in fig. 2, the method includes:
S101, a first linear voltage stabilizing circuit converts a first power supply voltage and transmits the converted first power supply voltage to a power supply selection circuit and an anti-reverse-filling circuit.
S102, a second power supply voltage obtained from the power supply pin by the power supply selection circuit is used for selecting a target power supply voltage between the converted first power supply voltage and the second power supply voltage and transmitting the target power supply voltage to the voltage output circuit.
S103, the anti-reverse-filling circuit determines whether to connect the voltage output circuit and the power pin according to the converted first power supply voltage and the converted second power supply voltage.
After the voltage output circuit 140 is connected to the power supply pin V, the second power supply voltage VCC1 may be established by the power supply voltage VCC 2.
Wherein the first power supply voltage Vin is provided by a first power supply. If only the first power supply provides the first power voltage Vin, the self-starting power supply system 100 is powered by a single power supply.
The second power supply voltage VCC1 may be directly supplied from the second power supply, or may be established through the power supply voltage VCC 2. If the second power voltage VCC1 is directly supplied by the second power source, the self-powered system 100 is powered by the dual power source. If the second supply voltage VCC1 is established by the supply voltage VCC2, this means that no second supply directly supplies the second supply voltage VCC1. At this time, the self-starting power supply system 100 is under single power supply.
And S104, the voltage output circuit provides a power supply voltage for the chip to be powered when the anti-reverse-filling circuit is communicated with the voltage output circuit and the power supply pin according to the selected power supply voltage.
The chip to be powered can work normally under the action of the power supply voltage VCC 2.
The first linear voltage regulator circuit 110 may convert the first power supply voltage Vin. And, the first linear voltage stabilizing circuit 110 may transmit the converted first supply voltage vbus_lv to the power selecting circuit 130 and the anti-reverse-filling circuit 120.
In this way, the power supply selection circuit 130 may determine whether the second power supply voltage VCC1 is already established according to the second power supply voltage VCC1, which is obtained from the power supply pin V, so that the power supply selection circuit 130 may select the target power supply voltage VALWAYS between the converted first power supply voltage vbus_lv and the second power supply voltage VCC 1. Also, the power supply selection circuit 130 may transmit the target power supply voltage VALWAYS to the voltage output circuit 140.
In case that the second power supply directly supplies the second power supply voltage VCC1, the second power supply voltage VCC1 is larger than the first preset voltage, meaning that the second power supply voltage VCC1 is in an established state. At this time, the power supply selection circuit 130 selects the second power supply voltage VCC1 as the target power supply voltage VALWAYS.
In case that the second power supply directly supplies the second power supply voltage VCC1, the second power supply voltage VCC1 is smaller than the first preset voltage, meaning that the second power supply voltage VCC1 is in an unestablished state. At this time, the power supply selection circuit 130 selects the converted first power supply voltage vbus_lv as the target power supply voltage VALWAYS.
In this way, the anti-reverse-filling circuit 120 may determine whether to connect the voltage output circuit 140 and the power supply pin V according to the converted first power supply voltage vbus_lv and the converted second power supply voltage VCC 1.
The anti-reverse-filling circuit 120 can know the establishment condition of the first power voltage Vin according to the converted first power voltage vbus_lv. In this way, the anti-reverse-filling circuit 120 may determine whether to connect the voltage output circuit 140 and the power supply pin V according to the converted first power supply voltage vbus_lv and the converted second power supply voltage VCC 1. Therefore, when the self-starting power supply system 120 is under dual power supply, the second power supply voltage VCC1 can be prevented from flowing back to the voltage output circuit 140, so that the self-starting power supply system 100 can support both single power supply and dual power supply.
Furthermore, the voltage output circuit 140 may transmit the power supply voltage VCC2 to the power supply pin V under the action of the target power supply voltage VALWAYS after the power supply pin V is connected to the voltage output circuit 140, so that the chip to be powered can operate.
According to the self-starting power supply system, the chip, the method and the electronic equipment provided by the application, the first power supply voltage is converted through the first linear voltage stabilizing circuit, and the converted first power supply voltage is transmitted to the power supply selection circuit and the anti-reverse-filling circuit, so that the power supply selection circuit and the anti-reverse-filling circuit can acquire the converted first power supply voltage. The power supply selection circuit can obtain a second power supply voltage from the power supply pin, and select a target power supply voltage between the converted first power supply voltage and the second power supply voltage according to the establishment condition of the second power supply voltage. The power supply selection circuit may transmit the target power supply voltage to the voltage output circuit, so that the voltage output circuit may output the power supply voltage. The anti-reverse-filling circuit can determine whether to connect the voltage output circuit and the power pin according to the converted first power voltage and second power voltage. Therefore, when the self-starting power supply system is under dual-power supply, the anti-reverse-filling circuit is not communicated with the voltage output circuit and the power supply pin, the reverse filling of the second power supply voltage to the voltage output circuit can be avoided, and the dual power supplies can be completely independent. Therefore, the self-starting power supply system can support single-power supply and double-power supply.
Based on the description of the above embodiments, one possible implementation of the power supply selection circuit 130 is exemplary. Referring to fig. 3, fig. 3 shows a schematic structural diagram of the self-starting power supply system in fig. 1. As shown in fig. 3, the power supply selection circuit 130 may include: a first power-on reset module 131 and a channel selection module 132.
The input end of the first power-on reset module 131 and the first input end of the channel selection module 132 are electrically connected with the power pin V, the output end of the first power-on reset module 131 is electrically connected with the control end of the channel selection module 132, and the second input end of the channel selection module 132 is electrically connected with the output end of the first linear voltage stabilizing circuit 110.
The first power-on reset module 131 may detect the establishment of the second power voltage VCC1 according to the first preset voltage, to obtain a first detection signal VCC1_ok. And, the first power-on reset module 131 may transmit the first detection signal VCC1_ok to the channel selection module 132.
The first preset voltage is used for determining a voltage value of the second power supply voltage. When the second power voltage is greater than the first preset voltage, the second power voltage VCC1 is established. When the second power supply voltage is smaller than the first preset voltage, the establishment condition of the second power supply voltage VCC1 is not established.
For example, when the first power-on reset module 131 detects that the second power voltage VCC1 is established, the first detection signal VCC1_ok is at a high level. When the first power-on reset module 131 detects that the second power voltage VCC1 is not established, the first detection signal VCC1_ok is at a low level.
In this way, the channel selection module 132 can select the target power voltage VALWAYS as the converted first power voltage vbus_lv or the second power voltage VCC1 under the action of the first detection signal VCC 1_ok.
When the first detection signal VCC1_ok is at the high level, the channel selection module 132 selects the target power supply voltage VALWAYS as the second power supply voltage VCC1.
When the first detection signal VCC1_ok is at a low level, the channel selection module 132 selects the target power supply voltage VALWAYS as the converted first power supply voltage vbus_lv.
In summary, the first power-on reset module can detect the establishment condition of the second power supply voltage according to the first preset voltage, and transmit a first detection signal to the channel selection module, so that the channel selection module can acquire the first detection signal. Furthermore, the channel selection module may select the target power supply voltage as the converted first power supply voltage or the converted second power supply voltage according to the first detection signal. Thus, the power supply selection circuit can transmit the target power supply voltage to the voltage output circuit.
Based on the description of the above embodiments, one possible implementation of the voltage output circuit 140 is exemplary. As shown in fig. 3, the voltage output circuit 140 may include: a second power-on reset module 141, a bandgap reference module 142 and a second linear voltage regulator 143.
The input end of the second power-on reset module 141 is electrically connected with the output end of the power supply selection circuit 130, the output end of the second power-on reset module 141 is electrically connected with the input end of the band gap reference module 142 and the first input end of the second linear voltage stabilizing circuit 143 respectively, the output end of the band gap reference module 142 is electrically connected with the second input end of the second linear voltage stabilizing circuit 143, the power supply end of the second linear voltage stabilizing circuit 143 is used for accessing the first power supply voltage Vin, and the output end of the second linear voltage stabilizing circuit 143 is electrically connected with the second end of the anti-reverse-filling circuit 120.
The second power-on reset module 141 may detect the establishment of the target power voltage VALWAYS according to a second preset voltage to obtain a second detection signal val_ok, and transmit the second detection signal val_ok to the bandgap reference module 142 and the second linear voltage stabilizing circuit 143.
The second preset voltage is used for determining a voltage value of the target power supply voltage. When the target power supply voltage VALWAYS is greater than the second preset voltage, the establishment condition of the target power supply voltage VALWAYS is established. When the target power supply voltage VALWAYS is less than the second preset voltage, the establishment condition of the target power supply voltage VALWAYS is not established.
The second detection signal val_ok is at a high level when the second power-on reset module 141 detects that the target power voltage VALWAYS has been established. When the second power-on reset module 141 detects that the target power voltage VALWAYS is not established, the second detection signal val_ok is at a low level.
Thus, the bandgap reference module 142 can generate the reference voltage VBG under the action of the second detection signal val_ok. And, the bandgap reference module 142 may transmit the reference voltage VBG to the second linear voltage stabilizing circuit 143.
Further, the second linear voltage stabilizing circuit 143 may generate the power supply voltage VCC2 based on the reference voltage VBG by the second detection signal val_ok. And, when the anti-reverse-filling circuit 120 connects the voltage output circuit 140 and the power supply pin V, the power supply voltage VCC2 is transmitted to the chip to be supplied.
In summary, the second power-on reset module may detect, according to a second preset voltage, an establishment condition of the target power supply voltage, and transmit a second detection signal to the band gap reference module and the second linear voltage stabilizing circuit, so that the band gap reference module and the second linear voltage stabilizing circuit acquire the second detection signal. Furthermore, the bandgap reference module can generate a reference voltage under the action of the second detection signal, and transmit the reference voltage to the second linear voltage stabilizing circuit, so that the second linear voltage stabilizing circuit can acquire the reference voltage. Therefore, the second linear voltage stabilizing circuit can generate the power supply voltage according to the reference voltage under the action of the second detection signal, so that the voltage output circuit can output the power supply voltage.
Based on the description of the above embodiments, an exemplary one possible implementation of the anti-reverse-fill circuit 120. As shown in fig. 3, the anti-reverse-filling circuit 120 may include: an isolation module 121 and a switching tube module 122.
The input end of the isolation module 121 is electrically connected with the output end of the first linear voltage stabilizing circuit 110, the output end of the isolation module 121 is electrically connected with the first end of the switching tube module 122, the second end of the switching tube module 122 is electrically connected with the output end of the voltage output circuit 140, and the third end of the switching tube module 122 is electrically connected with the power pin V.
In some examples, the switching tube module 122 may include: and a switching tube.
The number of the switching tubes may be one, or may be a plurality of switching tube groups, which is not particularly limited in the embodiment of the present application.
The isolation module 121 may detect the establishment of the converted first supply voltage vbus_lv according to the third preset voltage, to obtain a third detection signal iso. And, the isolation module 121 may transmit the third detection signal iso to the switch tube module 122.
The third preset voltage is used for determining the voltage value of the converted first power supply voltage VBUS_LV. When the converted first supply voltage vbus_lv is greater than the third preset voltage, the establishment condition of the converted first supply voltage vbus_lv is established. When the converted first supply voltage vbus_lv is smaller than the third preset voltage, the establishment condition of the converted first supply voltage vbus_lv is not established.
The third detection signal iso is illustratively low when the isolation module 121 detects that the converted first supply voltage vbus_lv has been established. When the isolation module 121 detects that the converted first supply voltage vbus_lv is not established, the third detection signal iso is at a high level.
In this way, the switching tube module 122 can determine whether to connect the voltage output circuit 140 and the power pin V according to the first power voltage Vin and the second power voltage VCC1 under the action of the third detection signal iso.
In some examples, when the third detection signal iso represents that the converted first power supply voltage vbus_lv is already established, that is, when the third detection signal iso is at a low level and the first power supply voltage Vin is greater than the second power supply voltage VCC1, the switch tube module 122 is turned on, so that the switch tube module 122 is connected to the voltage output circuit 140 and the power supply pin V.
When the third detection signal iso represents the converted first power voltage vbus_lv is established, that is, when the third detection signal iso is at a low level and the first power voltage Vin is less than the second power voltage VCC1, the switch tube module 122 is not turned on, so that the switch tube module 122 is not connected to the voltage output circuit 140 and the power pin V.
When the third detection signal iso represents that the converted first power supply voltage vbus_lv is not established, that is, when the third detection signal iso is at a high level and the first power supply voltage Vin is greater than the second power supply voltage VCC1, the switch tube module 122 is not turned on, so that the switch tube module 122 is not connected to the voltage output circuit 140 and the power supply pin V.
When the third detection signal iso represents that the converted first power supply voltage vbus_lv is not established, that is, when the third detection signal iso is at a high level and the first power supply voltage Vin is less than the second power supply voltage VCC1, the switch tube module 122 is not turned on, so that the switch tube module 122 is not connected to the voltage output circuit 140 and the power supply pin V.
Therefore, only when the third detection signal iso represents the converted first power supply voltage vbus_lv is established, that is, when the third detection signal iso is at a low level and the first power supply voltage Vin is greater than the second power supply voltage VCC1, the switch tube module 122 can connect the voltage output circuit 140 and the power supply pin V.
Based on the above description, the following describes in detail the operation principle of the self-starting power supply system 100 under the single power supply and the dual power supply, respectively. The content is as follows:
The second power supply voltage VCC1 is not established when the self-starting power supply system 100 is under single power supply. When the first power-on reset module 131 detects that the second power supply voltage VCC1 is not established, the obtained first detection signal VCC1_ok is at a low level. Thus, the target power voltage VALWAYS obtained by the channel selection module 132 is the converted first power voltage vbus_lv, so that the second power-on reset module 141 can detect the establishment condition of the target power voltage VALWAYS. In this way, when the second power-on reset module 141 detects that the target power supply voltage VALWAYS has been established, the obtained second detection signal val_ok is at a high level, so that the bandgap reference module 142 and the second linear voltage regulator 143 can operate under the action of the second detection signal val_ok. That is, the channel selection module 132 selects the first linear voltage regulator 110 to supply power to the bandgap reference module 142 and the second linear voltage regulator 143. Further, the bandgap reference module 142 may generate the reference voltage VBG and transmit the reference voltage VBG to the second linear voltage stabilizing circuit 143, so that the second linear voltage stabilizing circuit 143 may generate the supply voltage VCC2. In the process of generating the supply voltage VCC2 by the second linear regulator 143, the first supply voltage vbus_lv after conversion is detected to be established by the isolation module 121. And, the first power voltage Vin is always greater than the second power voltage VCC1. Therefore, the switch tube module 122 is in a conductive state, so that the switch tube module 122 can communicate the second linear voltage stabilizing circuit 143 with the power pin V. Thus, when the second linear voltage stabilizing circuit 143 is connected to the power supply pin V, the second linear voltage stabilizing circuit 143 may transmit the power supply voltage VCC2 to the chip to be powered, so that the second power supply voltage VCC1 may be established by the power supply voltage VCC2.
In addition, when the first power supply voltage Vin is smaller than the set value of the second power supply voltage VCC1, the power supply voltage VCC2 generated by the second linear voltage stabilizing circuit 143 cannot establish the second power supply voltage VCC1, and only the second power supply voltage VCC1 can be made equal to the power supply voltage VCC2, that is, the second power supply voltage VCC1 is equal to the first power supply voltage Vin. If the second power supply voltage VCC1 is equal to the set value, it is necessary to wait for the second power supply to be directly supplied. Thus, the self-starting power supply system 100 is under dual power supply.
Under the dual power supply of the self-starting power supply system 100, the self-starting power supply system 100 has two conditions that the first power supply voltage Vin is established before the second power supply voltage VCC1 and the second power supply voltage VCC1 is established before the first power supply voltage Vin.
In the case where the first power supply voltage Vin is established before the second power supply voltage VCC1, since the process by which the second power supply voltage VCC1 can be established by the power supply voltage VCC2 is similar to the process in which the self-starting power supply system 100 is powered by a single power supply, the description thereof will be omitted. When the second power voltage VCC1 is set to be greater than the first power voltage Vin, the switch tube module 122 is in a non-conductive state. In this way, the switching tube module 122 is not connected to the second linear voltage stabilizing circuit 143 and the power pin V, so that the second power voltage VCC1 can be prevented from being reversely fed to the voltage output circuit 140. In this way, when the first power-on reset module 131 detects that the second power supply voltage VCC1 is established, the obtained first detection signal VCC1_ok is at a high level. Thus, the target power voltage VALWAYS obtained by the channel selection module 132 is the second power voltage VCC1, so that the second power-on reset module 141 can detect the establishment of the target power voltage VALWAYS. Furthermore, when the second power-on reset module 141 detects that the target power supply voltage VALWAYS is established, the obtained second detection signal val_ok is at a high level, so that the bandgap reference module 142 and the second linear voltage stabilizing circuit 143 can operate under the action of the second detection signal val_ok. That is, the channel selection module 132 selects the second power supply to supply power to the bandgap reference module 142 and the second linear voltage regulator circuit 143.
In the case where the second power supply voltage VCC1 is established prior to the first power supply voltage Vin, the first power supply voltage Vin is not established. At this time, since the second power supply voltage VCC1 is pulled up by the second power supply, the first detection signal VCC1_ok is obtained when the first power-on reset module 131 detects that the second power supply voltage VCC1 is established. Thus, the target power voltage VALWAYS obtained by the channel selection module 132 is the second power voltage VCC1, so that the second power-on reset module 141 can detect the establishment of the target power voltage VALWAYS. In this way, when the second power-on reset module 141 detects that the target power supply voltage VALWAYS has been established, the obtained second detection signal val_ok is at a high level, so that the bandgap reference module 142 and the second linear voltage regulator 143 can operate under the action of the second detection signal val_ok. That is, the channel selection module 132 selects the second power source to supply power to the bandgap reference module 142 and the second linear voltage regulator circuit 143. Further, the bandgap reference module 142 may generate the reference voltage VBG and transmit the reference voltage VBG to the second linear voltage stabilizing circuit 143, so that the second linear voltage stabilizing circuit 143 may generate the supply voltage VCC2. In the process of generating the supply voltage VCC2 by the second linear regulator 143, the isolation module 121 detects that the establishment condition of the converted first supply voltage vbus_lv is not established. Therefore, the switch tube module 122 is in a non-conductive state, so that the switch tube module 122 can not connect the second linear voltage stabilizing circuit 143 and the power pin V, and the second power voltage VCC1 can be prevented from flowing back to the voltage output circuit 140.
In addition, with the establishment of the first power voltage Vin, the isolation module 121 may detect that the establishment of the converted first power voltage vbus_lv is established, so that the detection signal iso obtained by the isolation module 121 is at a low level. At this time, if the first power voltage Vin is smaller than the second power voltage VCC1 provided by the second power source, the switch tube module 122 is in a non-conductive state. If the first power voltage Vin is greater than the second power voltage VCC1 provided by the second power source, the switch tube module 122 is in a conductive state.
As can be seen from the above description, under the dual-power supply condition of the self-starting power supply system 100, no matter the first power supply voltage Vin provided by the first power supply is greater than or less than the second power supply voltage VCC1 provided by the second power supply, and the first power supply voltage Vin is established before the second power supply voltage VCC1 or the second power supply voltage VCC1 is established before the first power supply voltage Vin, since the switching tube module 122 can determine whether to connect the voltage output circuit 140 and the power supply pin V, the second power supply voltage VCC1 provided by the second power supply is prevented from being reversely fed to the voltage output circuit 140. Thus, the first power supply and the second power supply can be completely independent.
In summary, the isolation module may detect the establishment of the converted first power voltage according to the third preset voltage, and transmit the third detection signal to the switching tube module, so that the switching tube module may obtain the third detection signal. Therefore, the switching tube module can determine whether to communicate the voltage output circuit and the power pin under the action of the third detection signal. Thus, the anti-reverse-filling circuit can determine whether to connect the voltage output circuit and the power supply pin.
In addition, if the second power supply is a power supply without the capability of pulling down current, when the second power supply voltage VCC1 directly provided by the second power supply is greater than the set value, the power tube in the second linear voltage stabilizing circuit 143 is turned off, so that the voltage of the power supply pin V is the second power supply voltage VCC1 directly provided by the second power supply. When the second power voltage VCC1 directly provided by the second power supply is smaller than the set value, the voltage of the power supply pin V is the power supply voltage VCC2.
If the second power supply is a power supply with a pull-down current capability, when the second power supply voltage VCC1 directly provided by the second power supply is greater than the set value, the power tube in the second linear voltage stabilizing circuit 143 is turned off, so that the voltage of the power supply pin V is the second power supply voltage VCC1 directly provided by the second power supply. When the second power voltage VCC1 directly provided by the second power supply is smaller than the set value, the limiting current of the power supply voltage VCC2 output by the second linear voltage stabilizing circuit 143 flows into the second power supply, which causes a problem of power waste of the self-starting power supply system 100. Accordingly, the power supply voltage VCC2 outputted by the second linear regulator 143 is smaller than the second power supply voltage VCC1, so that the problem of power waste of the self-starting power supply system 100 can be avoided.
In this way, when the second power supply is an LDO that does not have the capability of pulling down current, it is not necessary to limit the supply voltage VCC2 output by the second linear regulator circuit 143 to be smaller than the second power supply voltage VCC1.
In addition, when the first power supply voltage Vin is greater than the second power supply voltage VCC1 provided by the second power supply, and the second power supply stops providing the second power supply voltage VCC1, the second linear voltage stabilizing circuit 143 may take over the second power supply to continue to supply power to the bandgap reference module 142 and the amplifier EA in the second linear voltage stabilizing circuit 143.
When the first power voltage Vin is smaller than the second power voltage VCC1 provided by the second power, and the second power stops providing the second power voltage VCC1, the first power-on reset module 131 may detect that the first detection signal VCC1_ok is at a low level when the second power voltage VCC1 is not completely established. In this way, the power supply voltage VCC2 is powered down with the power-down of the first power supply voltage Vin.
Finally, it should be noted that: the above embodiments are merely specific embodiments of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions within the technical scope of the present application should be covered by the scope of the present application. Therefore, the protection scope of the application is subject to the protection scope of the claims.

Claims (10)

1. A self-starting power supply system, characterized in that the self-starting power supply system comprises: the device comprises a first linear voltage stabilizing circuit, an anti-reverse-filling circuit, a power supply selection circuit and a voltage output circuit;
The input end of the first linear voltage stabilizing circuit and the power end of the voltage output circuit are both used for accessing a first power supply voltage, the output end of the first linear voltage stabilizing circuit is respectively and electrically connected with the first input end of the power supply selection circuit and the first end of the anti-reverse-filling circuit, the second input end of the power supply selection circuit is electrically connected with a power pin of a chip to be powered, the output end of the power supply selection circuit is electrically connected with the input end of the voltage output circuit, the output end of the voltage output circuit is electrically connected with the second end of the anti-reverse-filling circuit, and the third end of the anti-reverse-filling circuit is electrically connected with the power pin;
The first linear voltage stabilizing circuit is used for converting the first power supply voltage and transmitting the converted first power supply voltage to the power supply selection circuit and the anti-reverse-filling circuit;
The power supply selection circuit is used for acquiring a second power supply voltage from the power supply pin, selecting a target power supply voltage between the converted first power supply voltage and the second power supply voltage, and transmitting the target power supply voltage to the voltage output circuit;
the anti-reverse-filling circuit is used for determining whether to communicate the voltage output circuit with the power supply pin according to the converted first power supply voltage and the converted second power supply voltage;
The voltage output circuit is used for providing power supply voltage for the chip to be powered when the anti-reverse-filling circuit is communicated with the voltage output circuit and the power supply pin according to the target power supply voltage.
2. The system of claim 1, wherein the power supply selection circuit comprises: a first power-on reset module and a channel selection module;
The input end of the first power-on reset module and the first input end of the channel selection module are electrically connected with the power supply pin, the output end of the first power-on reset module is electrically connected with the control end of the channel selection module, and the second input end of the channel selection module is electrically connected with the output end of the first linear voltage stabilizing circuit;
The first power-on reset module is used for detecting the establishment condition of the second power supply voltage according to a first preset voltage to obtain a first detection signal, and transmitting the first detection signal to the channel selection module, wherein the first preset voltage is used for determining the voltage value of the second power supply voltage, and the establishment condition comprises established and unessential;
the channel selection module is configured to select, under the action of the first detection signal, the target power supply voltage to be the converted first power supply voltage or the converted second power supply voltage.
3. The system according to claim 1 or 2, wherein the voltage output circuit comprises: the second power-on reset module, the band gap reference module and the second linear voltage stabilizing circuit;
The input end of the second power-on reset module is electrically connected with the output end of the power supply selection circuit, the output end of the second power-on reset module is electrically connected with the input end of the band gap reference module and the first input end of the second linear voltage stabilizing circuit respectively, the output end of the band gap reference module is electrically connected with the second input end of the second linear voltage stabilizing circuit, the power supply end of the second linear voltage stabilizing circuit is used for being connected with the first power supply voltage, and the output end of the second linear voltage stabilizing circuit is electrically connected with the second end of the anti-reverse-filling circuit;
The second power-on reset module is configured to detect an establishment condition of the target power supply voltage according to a second preset voltage, obtain a second detection signal, and transmit the second detection signal to the band gap reference module and the second linear voltage stabilizing circuit, where the second preset voltage is used to determine a voltage value of the target power supply voltage;
The band gap reference module is used for generating a reference voltage under the action of the second detection signal and transmitting the reference voltage to the second linear voltage stabilizing circuit;
The second linear voltage stabilizing circuit is used for generating the power supply voltage according to the reference voltage under the action of the second detection signal, and transmitting the power supply voltage to the chip to be powered when the anti-reverse-filling circuit is communicated with the voltage output circuit and the power supply pin.
4. The system of claim 1 or 2, wherein the anti-reverse-fill circuit comprises: an isolation module and a switch tube module;
The input end of the isolation module is electrically connected with the output end of the first linear voltage stabilizing circuit, the output end of the isolation module is electrically connected with the first end of the switching tube module, the second end of the switching tube module is electrically connected with the output end of the voltage output circuit, and the third end of the switching tube module is electrically connected with the power pin;
The isolation module is used for detecting the establishment condition of the converted first power supply voltage according to a third preset voltage to obtain a third detection signal, and transmitting the third detection signal to the switch tube module, wherein the third preset voltage is used for determining the voltage value of the converted first power supply voltage;
and the switching tube module is used for determining whether to connect the voltage output circuit and the power pin according to the comparison result of the first power supply voltage and the second power supply voltage under the action of the third detection signal.
5. The system of claim 4, wherein the system further comprises a controller configured to control the controller,
The switching tube module is specifically configured to communicate the voltage output circuit with the power pin when the third detection signal characterizes that the converted first power voltage is established and the first power voltage is greater than the second power voltage.
6. The system of claim 4, wherein the system further comprises a controller configured to control the controller,
The switch tube module is specifically configured to not connect the voltage output circuit and the power pin when the third detection signal indicates that the converted first power supply voltage is not established and/or the first power supply voltage is smaller than the second power supply voltage.
7. The system of claim 1 or 2, wherein the supply voltage is less than the second supply voltage.
8. A self-starting power supply chip, comprising: a self-starting power supply system as claimed in any one of claims 1 to 7.
9. A method of self-starting power supply, characterized in that the method is applied to a main self-starting power supply system according to any one of claims 1-7, the method comprising:
The first linear voltage stabilizing circuit converts the first power supply voltage and transmits the converted first power supply voltage to the power supply selection circuit and the anti-reverse-filling circuit;
the power supply selection circuit selects a target power supply voltage between the converted first power supply voltage and the second power supply voltage from the second power supply voltage acquired by the power supply pin, and transmits the target power supply voltage to the voltage output circuit;
the anti-reverse-filling circuit determines whether to connect the voltage output circuit and the power pin according to the converted first power voltage and the converted second power voltage;
and the voltage output circuit provides a supply voltage for the chip to be supplied with power when the anti-reverse-filling circuit is communicated with the voltage output circuit and the power pin according to the target power supply voltage.
10. An electronic device, comprising: the self-starting power chip of claim 8.
CN202410454976.XA 2024-04-16 2024-04-16 Self-starting power supply system, self-starting power supply chip, method and electronic equipment Pending CN118336891A (en)

Priority Applications (1)

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CN202410454976.XA CN118336891A (en) 2024-04-16 2024-04-16 Self-starting power supply system, self-starting power supply chip, method and electronic equipment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202410454976.XA CN118336891A (en) 2024-04-16 2024-04-16 Self-starting power supply system, self-starting power supply chip, method and electronic equipment

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Publication Number Publication Date
CN118336891A true CN118336891A (en) 2024-07-12

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