CN111082479A - Battery management unit and system-on-chip - Google Patents
Battery management unit and system-on-chip Download PDFInfo
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- CN111082479A CN111082479A CN201910752430.1A CN201910752430A CN111082479A CN 111082479 A CN111082479 A CN 111082479A CN 201910752430 A CN201910752430 A CN 201910752430A CN 111082479 A CN111082479 A CN 111082479A
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- 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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0063—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with circuits adapted for supplying loads from the battery
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Abstract
The embodiment of the invention provides a battery management unit and a system-on-chip. The battery management unit includes: the device comprises a battery voltage detection module, a control switching module and a DC/DC converter; the battery voltage detection module is used for detecting the voltage of the battery power supply so as to determine the voltage value of the battery power supply; the control switching module is used for controlling the battery power supply to be connected with the internal circuit when the voltage value is within a first voltage range so as to enable the voltage of the battery power supply to supply power to the internal circuit; and when the voltage value is in the second voltage range, controlling the battery power supply to be connected with the DC/DC converter so as to supply power to the internal circuit after the voltage of the battery power supply is converted by the DC/DC converter. The technical scheme solves the problems that in order to simplify the design of the PMU, the application range of a product is limited due to the limitation of the input voltage range of a chip and the design of a conversion circuit is complicated due to the simultaneous application of two conversion circuits of Boost/Buck in the prior art.
Description
[ technical field ] A method for producing a semiconductor device
The invention relates to the technical field of chip power supply, in particular to a battery management unit and a system-on-chip.
[ background of the invention ]
The power supply voltage of the core circuit inside the same system-on-chip is usually constant, while the power supply voltage of the whole system-on-chip varies with different power supplies. Therefore, many System on a chip (SoC) require a battery Management Unit (PMU) to perform voltage conversion, and in order to adapt to a huge Power supply pressure, the PMU may become very complex in design, consume more current, and increase in complexity causes design error, and a lot of effort is required to perform reliability verification.
In the prior art, there are two main solutions currently available:
one is to limit the input voltage range of the chip, and not allow the use of voltages beyond the voltage range, but this will clearly limit the application range of the product.
The other is to apply two conversion circuits of Boost/Buck (voltage Boost/voltage reduction circuit) at the same time to ensure that the internal power supply voltage of the chip is within the range, thus saving the power consumption of the chip but increasing the complexity of the conversion circuit.
[ summary of the invention ]
In view of this, embodiments of the present invention provide a battery management unit and a system-on-chip, so as to solve the problems in the prior art that, in order to simplify the design of the PMU, the input voltage range of the chip is limited, which results in the limited application range of the product, and the two conversion circuits, i.e., the Boost/Buck circuit, are simultaneously applied, which results in the complicated design of the conversion circuit.
In one aspect, an embodiment of the present invention provides a battery management unit, including: the device comprises a battery voltage detection module, a control switching module and a DC/DC converter; the battery voltage detection module is used for detecting the voltage of a battery power supply to determine the voltage value of the battery power supply; the control switching module is used for controlling the battery power supply to be connected with an internal circuit when the voltage value is within a first voltage range, so that the voltage of the battery power supply supplies power to the internal circuit; and when the voltage value is within a second voltage range, controlling the battery power supply to be connected with the DC/DC converter so as to enable the voltage of the battery power supply to be converted by the DC/DC converter and then supply power to the internal circuit.
Optionally, if the voltage value in the first voltage range is smaller than the voltage value in the second voltage range, the DC/DC converter is a buck converter.
Optionally, the battery management unit further includes: a Low Dropout Regulator (LDO); the control switching module is further configured to control the battery power supply to be connected with the low dropout regulator when the voltage value is within a first voltage range, so that the voltage of the battery power supply is regulated by the low dropout regulator to supply power to the internal circuit; and when the voltage value is within a second voltage range, controlling the battery power supply to be connected with the DC/DC converter and the low-voltage-drop linear voltage stabilizer, so that the voltage of the battery power supply is converted by the DC/DC converter and then is regulated by the low-voltage-drop linear voltage stabilizer to supply power to the internal circuit.
Optionally, the first voltage range is [ V ]1，V2]The second voltage range is (V)2，V3](ii) a Wherein, V1<V2<V3。
Optionally, the first voltage range is [1.5V,1.8V ], and the second voltage range is (1.8V,3.6V ].
Optionally, if the voltage value in the first voltage range is greater than the voltage value in the second voltage range, the DC/DC converter is a boost converter.
On the other hand, the embodiment of the invention also provides a system-level chip, which comprises a battery power supply, the battery management unit and an internal circuit; wherein the battery power supply is used for providing voltage for the system-on-chip; and the battery management unit is used for outputting the power supply voltage required by the internal circuit according to the voltage range of the detected voltage of the battery power supply.
Compared with the prior art, the technical scheme at least has the following beneficial effects:
according to the battery management unit provided by the embodiment of the invention, the voltage of the battery power supply is detected by the battery voltage detection module to determine the voltage value of the battery power supply, and the control switching module determines the mode of supplying power to the internal circuit by the battery power supply according to different voltage ranges of the voltage value. If the voltage of the battery power supply meets the power supply voltage requirement of the internal circuit (namely the voltage is in a first voltage range), the battery power supply is directly utilized to supply power for the internal circuit; if the voltage of the battery power supply is higher than the power supply voltage requirement of the internal circuit (i.e. the voltage is within the second voltage range), the voltage of the battery power supply is converted by the DC/DC converter and then the internal circuit is powered. Because the voltage of the battery power supply is detected in advance, the voltage of the battery power supply is converted by the DC/DC converter only when the voltage of the battery power supply is high voltage (namely higher than the power supply voltage requirement of an internal circuit), so that the design of the DC/DC converter is simpler (only a step-down DC/DC converter is needed) and the power consumption is smaller, and by adopting the mode, the voltage range of the battery power supply of the chip is not limited, the power consumption of the chip is not increased, and the design complexity of the DC/DC converter is not high.
Further, considering that the power supply voltage required by a part of internal circuits in the chip cannot directly adopt the voltage output by the DC/DC converter, the battery management unit further includes a low dropout regulator that regulates the voltage converted by the DC/DC converter to supply power to the internal circuits. The voltage of the battery power supply can be regulated by the low-voltage-drop linear voltage regulator and then supplies power to the internal circuit, so that the requirements of power supply voltages of different internal circuits can be met.
[ description of the drawings ]
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an embodiment of a battery management unit according to the present invention;
FIG. 2 is a schematic structural diagram of another embodiment of a battery management unit according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of an embodiment of a system-on-chip according to an embodiment of the present invention.
[ detailed description ] embodiments
For better understanding of the technical solutions of the present invention, the following detailed descriptions of the embodiments of the present invention are provided with reference to the accompanying drawings.
It should be understood that the described embodiments are only some embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 1 is a schematic structural diagram of an embodiment of a battery management unit according to an embodiment of the present invention.
Referring to fig. 1, the battery management unit 11 includes: a battery voltage detection module 111, a control switching module 112, and a DC/DC converter 113.
In the present embodiment, the battery voltage detection module 111 is configured to detect the voltage of the battery power source 12 to determine the voltage value of the battery power source 12. In practical application, the battery power supply may adopt a lithium battery. If there is a battery power supply, the battery voltage detection module 111 may detect the voltage of the battery power supply; if there are multiple battery sources, the battery voltage detection module 111 may detect the voltage of each battery source. The battery voltage detection module 111 may use a single chip to detect the voltage of the battery power supply, and obtain the voltage value of the battery power supply through an analog-to-digital conversion module of the single chip.
The control switching module 112 may determine a voltage range where the voltage value is located according to the voltage value of the battery power supply detected by the battery voltage detection module 111, and further control a power supply manner of the battery power supply 12 for the internal circuit 13 according to the voltage range where the voltage value is located.
For example, for a system-on-chip, the power supply voltage of its internal circuit generally only needs a low voltage (e.g., 1.5V), and the voltage of the battery power supply of the system-on-chip may be a low voltage (e.g., 1.5V to 1.8V) or a high voltage (1.8V to 3.6V), so that it is determined according to the voltage range in which the detected voltage of the battery power supply is located to directly use the battery power supply to supply power to the internal circuit, or to convert the voltage of the battery power supply to supply power to the internal circuit.
Specifically, when the voltage value of the battery power supply 12 is within a first voltage range, the battery power supply 12 is controlled to be connected with the internal circuit 13, so that the voltage of the battery power supply 12 supplies power to the internal circuit 3. With continued reference to fig. 1, the control switch module 112 controls the switch S1 in the switch module 14 to open and the switch S2 to close so that the battery power source 12 is connected to the internal circuit 13 and the battery power source 12 is disconnected from the DC/DC converter 113 so that the voltage of the battery power source 12 can directly power the internal circuit 13.
And when the voltage value is in a second voltage range, controlling the battery power supply 12 to be connected with the DC/DC converter 113, so that the voltage of the battery power supply 12 is converted by the DC/DC converter 113 to supply power to the internal circuit 13. With continued reference to fig. 1, the control switching module 112 controls the switch S1 in the switch module 14 to be closed and the switch S2 to be opened so as to connect the battery power source 12 with the DC/DC converter 113, so that the voltage of the battery power source 12 is converted by the DC/DC converter 113 to supply power to the internal circuit 13.
In this embodiment, the voltage value in the first voltage range is smaller than the voltage value in the second voltage range. Specifically, the first voltage range is [ V ]1，V2]The second voltage range is (V)2，V3](ii) a Wherein, V1<V2<V3. For example, the first voltage range is [1.5V,1.8V ]]The second voltage range is (1.8V, 3.6V)]。
The DC/DC converter is a voltage converter that effectively outputs a fixed voltage after converting an input voltage in a direct current circuit, and is also called a Switching Mode Power Supply (Switching Mode Power Supply). Commonly used DC/DC converters include the following three categories: boost-type (Boost) DC/DC converters, Buck-type (Buck) DC/DC converters, and Boost-Buck-type (Boost/Buck) DC/DC converters. A Boost (Boost) DC/DC converter refers to a converter that increases an input voltage to obtain an output voltage higher than the input voltage. A Buck (Buck) DC/DC converter is a converter that adjusts an input voltage down to obtain an output voltage lower than the input voltage. A Boost-Buck (Boost/Buck) DC/DC converter is a converter that can obtain an output voltage higher than an input voltage by boosting the input voltage, or obtain an output voltage lower than the input voltage by reducing the input voltage.
In practical application, the DC/DC converter works on the principle that the voltage of a battery power supply is converted into alternating current, then the alternating current is converted into different voltages through a capacitor, an inductor and other elements, and then the different voltages are subjected to integral filtering to finally obtain direct current voltage. Because the DC/DC converter can convert the input direct current voltage into the alternating current, the input direct current circuit can be boosted and reduced in voltage, and the required fixed voltage is obtained and then converted into the direct current voltage to be output.
The specific circuit structure of the DC/DC converter can be implemented in various ways. For example, a self-oscillation circuit based on LC (inductance capacitance) or a circuit using a switching control method may be used, and the circuit includes: 1) PFM (pulse frequency modulation), i.e. a constant width of the switching pulse, stabilizes the output voltage by changing the frequency of the pulse output. 2) PWM (pulse width modulation), i.e., a switching pulse, has a constant frequency, and the output voltage is stabilized by changing the pulse output width.
Those skilled in the art can design DC/DC converters with different circuit structures according to requirements, which are not listed here.
In this embodiment, in a case where the voltage value in the first voltage range is smaller than the voltage value in the second voltage range, the DC/DC converter is a Buck-type (Buck) converter. That is, in this embodiment, by detecting the voltage of the battery power supply in advance, the voltage of the battery power supply is converted by the DC/DC converter only when the voltage of the battery power supply is high (i.e. higher than the power supply voltage requirement of the internal circuit), so the design of the DC/DC converter is relatively simple (only the step-down DC/DC converter is needed) and the power consumption is relatively small, and in this way, not only the voltage range of the battery power supply of the chip does not need to be limited, but also the power consumption of the chip does not increase.
In other embodiments, if the voltage value in the first voltage range is greater than the voltage value in the second voltage range, the DC/DC converter is a boost converter. That is, by detecting the voltage of the battery power supply in advance, the voltage of the battery power supply is converted by the boost-type DC/DC converter when the voltage of the battery power supply is low (i.e., lower than the supply voltage requirement of the internal circuit) to obtain an output voltage higher than the input voltage (i.e., the voltage of the battery power supply) as the supply voltage of the internal circuit.
Further, in practical applications, different internal circuits require different power supply voltages, and therefore, according to the number of power supply voltages required by the internal circuits, a plurality of DC/DC converters may be disposed in the battery management unit to convert the voltage of the battery power supply into different direct-current voltages respectively for supplying power to the different internal circuits.
Fig. 2 is a schematic structural diagram of another embodiment of a battery management unit according to an embodiment of the present invention. Referring to fig. 2, the battery management unit 21 includes: a battery voltage detection module 211, a control switching module 212, a DC/DC converter 213, and a low dropout regulator 214. Unlike the embodiment shown in fig. 1, in this embodiment, a low dropout linear regulator 214 is added to the battery management unit 21.
The inventor considers that in practical application, a plurality of different internal circuits are arranged in a chip, the different internal circuits may need different supply voltages, some internal circuits may adopt the voltage converted by a DC/DC converter as the supply voltage, some internal circuits may not directly adopt the voltage converted by the DC/DC converter as the supply voltage, and the output voltage of the DC/DC converter needs to be regulated by a low-voltage-drop linear regulator to be used as the supply voltage. Compared with a DC/DC converter, the low dropout linear regulator is suitable for regulating an input voltage to subtract excess voltage under the condition that the input voltage and the output voltage are closer to each other, and generates a regulated output voltage.
Specifically, in the present embodiment, the specific implementation of the battery voltage detection module 211 and the DC/DC converter 213 can refer to the description of the embodiment of fig. 1 above.
The control switching module 212 is configured to control the switch S1 in the switch module 24 to be opened and the switch S2 to be closed when the voltage value of the battery power source 22 is within a first voltage range, so that the battery power source 22 is connected to the low dropout regulator 214, and the voltage of the battery power source 22 is regulated by the low dropout regulator 214 to supply power to the internal circuit 23.
In practical applications, if the voltage of the battery power source 22 is different from the power supply voltage required by the internal circuit 23, and the voltage of the battery power source 22 is adjusted only by using the low-dropout linear regulator 214, since the input current of the low-dropout linear regulator is substantially equal to the output current, if the voltage drop is too large, the energy consumed by the low-dropout linear regulator is too large, and the efficiency is not high. Therefore, it is also conceivable to convert the voltage of the battery power source 22 by using a DC/DC converter, and then adjust the voltage by the low-dropout linear regulator 214 to supply power to the internal circuit 23.
When the voltage value of the battery power source 22 is within the second voltage range, the switch S1 in the control switch module 24 is closed and the switch S2 is opened, so that the battery power source 22 is connected to the DC/DC converter 213 and the low dropout linear regulator 214, and the voltage of the battery power source 22 is converted by the DC/DC converter 213 and then regulated by the low dropout linear regulator 214 to supply power to the internal circuit 23.
In practical applications, the low dropout regulator 214 can be implemented by using various circuit structures, and those skilled in the art can design low dropout regulators with different circuit structures according to requirements, which are not listed here.
Fig. 3 is a schematic structural diagram of an embodiment of a system-on-chip according to an embodiment of the present invention.
Referring to fig. 3, the system-on-chip 31 includes: a battery power supply 311, a battery management unit 312, and an internal circuit 313. The battery power 311 is used for providing voltage for the system-on-chip 31. The battery management unit 312 is configured to output a supply voltage required by the internal circuit 313 according to a voltage range in which the detected voltage of the battery power source 311 is located.
Specifically, the system-on-chip 31 is an integrated circuit with a dedicated target, which contains the complete system and has the entire content of the embedded software. The system-on-chip 31 includes a logic core, a memory, and an analog core. The logic core comprises a CPU, a clock circuit, a timer, an interrupt controller, a serial-parallel interface, other peripheral equipment, an I/O port, bonding logic used among various IP cores and the like; the memory core comprises various volatile, nonvolatile, Cache and other memories. The analog core comprises an analog-to-digital conversion circuit, a digital-to-analog conversion circuit, a phase-locked loop, an analog circuit used in some high-speed circuits and the like.
The battery power supply 311 is a direct current power supply (for example, a lithium battery may be used), and the battery power supply 311 provides a required voltage for the system on chip. The battery management unit 312 may be the battery management unit described in the embodiment of fig. 1 or fig. 2, and outputs the power supply voltage required by the internal circuit 313 according to the voltage range in which the detected voltage of the battery power source 311 is located. The internal circuit 313 may have a plurality of different circuits, and the battery management unit 312 may convert the voltage of the battery power 311 into different output voltages to adapt to different supply voltages required by the internal circuit 313.
In summary, with the battery management unit provided in the present technical solution, the voltage of the battery power supply is detected by the battery voltage detection module to determine the voltage value of the battery power supply, and the control switching module determines the manner in which the battery power supply supplies power to the internal circuit according to the different voltage ranges in which the voltage values are located. If the voltage of the battery power supply meets the power supply voltage requirement of the internal circuit (namely the voltage is in a first voltage range), the battery power supply is directly utilized to supply power for the internal circuit; if the voltage of the battery power supply is higher than the power supply voltage requirement of the internal circuit (i.e. the voltage is within the second voltage range), the voltage of the battery power supply is converted by the DC/DC converter and then the internal circuit is powered. Because the voltage of the battery power supply is detected in advance, the voltage of the battery power supply is converted by the DC/DC converter only when the voltage of the battery power supply is high voltage (namely higher than the power supply voltage requirement of an internal circuit), so that the design of the DC/DC converter is simpler (only a step-down DC/DC converter is needed) and the power consumption is smaller, and by adopting the mode, the voltage range of the battery power supply of the chip is not limited, and the power consumption of the chip is not increased.
Further, considering that the power supply voltage required by a part of internal circuits in the chip cannot directly adopt the voltage output by the DC/DC converter, the battery management unit further includes a low dropout regulator that regulates the voltage converted by the DC/DC converter to supply power to the internal circuits. The voltage of the battery power supply can be regulated by the low-voltage-drop linear voltage regulator and then supplies power to the internal circuit, so that the requirements of power supply voltages of different internal circuits can be met.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the examples of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (7)
1. A battery management unit, comprising: the device comprises a battery voltage detection module, a control switching module and a DC/DC converter; wherein the content of the first and second substances,
the battery voltage detection module is used for detecting the voltage of a battery power supply so as to determine the voltage value of the battery power supply;
the control switching module is used for controlling the battery power supply to be connected with an internal circuit when the voltage value is within a first voltage range, so that the voltage of the battery power supply supplies power to the internal circuit; and when the voltage value is within a second voltage range, controlling the battery power supply to be connected with the DC/DC converter so as to enable the voltage of the battery power supply to be converted by the DC/DC converter and then supply power to the internal circuit.
2. The battery management unit of claim 1, wherein the DC/DC converter is a buck-type converter if the voltage value in the first voltage range is less than the voltage value in the second voltage range.
3. The battery management unit of claim 2, wherein the battery management unit further comprises: a low dropout linear regulator;
the control switching module is further configured to control the battery power supply to be connected with the low dropout regulator when the voltage value is within a first voltage range, so that the voltage of the battery power supply is regulated by the low dropout regulator to supply power to the internal circuit; and when the voltage value is within a second voltage range, controlling the battery power supply to be connected with the DC/DC converter and the low-voltage-drop linear voltage stabilizer, so that the voltage of the battery power supply is converted by the DC/DC converter and then is regulated by the low-voltage-drop linear voltage stabilizer to supply power to the internal circuit.
4. The battery management unit of claim 2, wherein the first voltage range is [ V ]1，V2]The second voltage range is (V)2，V3](ii) a Wherein, V1<V2<V3。
5. The battery management unit of claim 4, wherein the first voltage range is [1.5V,1.8V ], and the second voltage range is (1.8V,3.6V ].
6. The battery management unit of claim 1, wherein the DC/DC converter is a boost converter if the voltage value in the first voltage range is greater than the voltage value in the second voltage range.
7. A system-in-a-chip comprising a battery power supply, a battery management unit of any of claims 1-6, internal circuitry; wherein the content of the first and second substances,
the battery power supply is used for providing voltage for the system-on-chip;
and the battery management unit is used for outputting the power supply voltage required by the internal circuit according to the voltage range of the detected voltage of the battery power supply.
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| CN1462922A (en) * | 2003-06-19 | 2003-12-24 | 上海北大方正科技电脑系统有限公司 | Power supply management system for palm equipment |
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