CN115589133A - Power supply multiplexer and control method thereof - Google Patents

Power supply multiplexer and control method thereof Download PDF

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Publication number
CN115589133A
CN115589133A CN202211588856.6A CN202211588856A CN115589133A CN 115589133 A CN115589133 A CN 115589133A CN 202211588856 A CN202211588856 A CN 202211588856A CN 115589133 A CN115589133 A CN 115589133A
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voltage
power supply
path
input
pin
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CN115589133B (en
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孙霓
黄炯
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Glf Microelectronics Sichuan Co ltd
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Glf Microelectronics Sichuan Co ltd
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    • 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
    • H02M1/0003—Details of control, feedback or regulation circuits
    • H02M1/0006—Arrangements for supplying an adequate voltage to the control circuit of converters
    • 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
    • H02M1/0003—Details of control, feedback or regulation circuits
    • H02M1/0012—Control circuits using digital or numerical techniques
    • 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
    • H02M1/0083—Converters characterised by their input or output configuration
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D10/00—Energy efficient computing, e.g. low power processors, power management or thermal management

Abstract

The invention provides a power supply multiplexer and a control method thereof, wherein: the power supply control chip is respectively supplied with power through two paths of input power supplies, a first path of input voltage and a second path of input voltage are respectively used as control signal voltages and connected to an SEL pin and an EN pin, or the first path of input voltage or the second path of input voltage is used as the control signal voltages and the corresponding path of control signal voltages are respectively connected to the EN pin and the SEL pin, a voltage detection and comparison unit is used for detecting the corresponding path of input voltage and comparing the corresponding path of input voltage with a preset reference voltage, a digital signal of low level or high level is output and used as a SEL pin or EN pin control signal, and the corresponding path of input power supply is selected as output according to different control signal states of the SEL pin and the EN pin. The invention can control the two input power supplies to switch under a specific voltage value, and can also switch even under the condition that the voltage values of the two input power supplies are completely the same, so that the consistency of chips when the power supplies are switched is ensured.

Description

Power supply multiplexer and control method thereof
Technical Field
The invention relates to the field of multi-path power supply switching, in particular to a power supply multiplexer and a control method thereof.
Background
The power supply multiplexer selects between two input power supply paths and converts it into a single output with protection. The power multiplexer selects between barrel jack, USB, wireless charging, backup power, battery, and other inputs. In addition, these devices also help in applications that require fast or seamless switching responses to ensure that the system does not reset during power transitions.
The traditional power supply multiplexer needs two independent control signals to control the selection of an input power supply, a peripheral control device is needed to provide independent digital control signals in the control mode, more and more actual application control signals are provided by the input power supply, the voltage of the input power supply is an analog signal, and therefore power failure caused by unstable control signals during switching of the two input power supplies can be easily caused.
Referring to fig. 1, which is an application block diagram of a typical Power supply multiplexer, where VIN1 and VIN2 are two Power supply inputs, power Mux is the Power supply multiplexer, GND is a ground pin, VOUT selects one of the two Power supply inputs through two switches to supply to a subsequent circuit, a first capacitor C1, a second capacitor C2, and a third capacitor C3 are used to store energy and then release the energy, and RL is a load. The EN and the SEL are two logic control pins, different input and output combinations are realized through the combination of different logic levels of the EN and the SEL, wherein the EN and the SEL are controlled by independent control signals given by an external control circuit, the two control signals are digital signals, namely, clear high levels or low levels, and a middle gray state does not exist, however, in the case, an additional control circuit or an additional control chip is required to be used for independently accessing the EN and SEL digital control signals, and the power supply multiplexer is wide in application scene and mostly used together with the control chip or a power supply chip, so that the addition of the additional control circuit or the additional control chip occupies more chip packaging space in a mode of further using the EN and SEL digital control signals, and more software and hardware resources are also invested.
Referring to fig. 2, which is a commonly used circuit diagram of a power multiplexer, wherein SEL and EN are respectively controlled by two input power sources, GND is a ground pin, a fourth capacitor C4, a fifth capacitor C5 and a sixth capacitor C6 are used for releasing power after storing energy, a first voltage dividing resistor R1 and a second voltage dividing resistor R2 are used for dividing voltage, in this application, since the voltages of the two input power sources are analog signals, the voltage value is uncertain, particularly, during switching, the voltage on the VIN2 input pin fluctuates due to the conversion of the input power sources and the conversion of an output load, and meanwhile, since the EN pin is powered up again after being powered down, the voltage of the EN pin at a high level is not specific, so that the level on the control pin EN switches back and forth at the high and low levels, so VOUT switches back and forth between VIN1 and VIN2, thereby causing output oscillation, possibly resetting the system power down, and, when the two input power sources are consistent, the power multiplexer cannot distinguish the two input power sources, that is, i.e., switching between the input power sources cannot be consistent, thereby, the power source is switched, and the power supply mode is not reliable and the system is not oscillated.
Disclosure of Invention
The invention aims to provide a power supply multiplexer and a control method thereof, which can control two paths of input power supplies to be switched under a specific voltage value, and can also be switched even under the condition that the voltage values of the two paths of input power supplies are completely the same, so that chips can be ensured to be consistent when the power supplies are switched, the oscillation caused when the input power supplies are selected is avoided, and the reliability of system power supply control is ensured.
The invention solves the technical problem, and adopts the technical scheme that:
in one aspect, the present invention provides a power supply multiplexer comprising:
the first input power supply is used for providing a first input circuit voltage for a first power supply receiving end of the power supply control chip;
the second input power supply is used for providing a second input voltage to a second power supply receiving end of the power supply control chip;
the voltage detection and comparison unit is used for detecting the first path of input voltage or the second path of input voltage, comparing the detected first path of input voltage or the detected second path of input voltage with a preset reference voltage and outputting a low-level or high-level digital signal as a SEL pin or an EN pin control signal of the power control chip according to a comparison result when the first path of input voltage is used as a control signal voltage and the second path of input voltage is used as a control signal voltage and is connected to the EN pin and the SEL pin of the power control chip respectively;
and the power supply control chip is used for selecting the first path of input power supply or the second path of input power supply as output according to different control signal states of the SEL pin or the EN pin.
For further optimization, when the first path of input voltage is used as control signal voltage and connected to an SEL pin of a power control chip, the second path of input voltage is used as control signal voltage and connected to an EN pin of the power control chip, and the voltage detection and comparison unit is arranged in the first path of input power, the voltage detection and comparison unit is used for detecting the first path of input voltage, comparing the detected first path of input voltage with preset reference voltage, and outputting a low-level or high-level digital signal as an SEL pin control signal of the power control chip according to a comparison result;
the outputting of the digital signal of low level or high level as the SEL pin control signal of the power control chip according to the comparison result specifically means:
when the voltage of the first path of input power supply is detected to be greater than the preset reference voltage, the voltage detection and comparison unit outputs a high-level digital signal as an SEL pin control signal of the power control chip according to the comparison result, and when the voltage of the first path of input power supply is detected to be less than the preset reference voltage, the voltage detection and comparison unit outputs a low-level digital signal as an SEL pin control signal of the power control chip according to the comparison result.
For further optimization, when the first path of input voltage is used as a control signal voltage to be connected to an SEL pin of a power control chip, the second path of input voltage is used as a control signal voltage to be connected to an EN pin of the power control chip, and the voltage detection and comparison unit is arranged in the second path of input power, the voltage detection and comparison unit is used for detecting the second path of input voltage, comparing the detected second path of input voltage with a preset reference voltage, and outputting a low-level or high-level digital signal as an EN pin control signal of the power control chip according to a comparison result;
the output low-level or high-level digital signal according to the comparison result is used as an EN pin control signal of the power control chip, and specifically means that:
when the voltage of the second input power supply is detected to be greater than the preset reference voltage, the voltage detection and comparison unit outputs a high-level digital signal as an EN pin control signal of the power control chip according to the comparison result, and when the voltage of the second input power supply is detected to be less than the preset reference voltage, the voltage detection and comparison unit outputs a low-level digital signal as an EN pin control signal of the power control chip according to the comparison result.
As a further optimization, the power control chip is configured to select the first input power or the second input power as an output according to different control signal states of the SEL pin or the EN pin, specifically:
when the SEL pin of the power control chip receives a digital control signal with a high level, selecting a first path of input power as output, and when the SEL pin of the power control chip receives a digital control signal with a low level, selecting a second path of input power as output;
and when the EN pin of the power supply control chip receives a digital control signal with a low level, the first input power supply is selected as output.
For further optimization, when the first path of input voltage or the second path of input voltage is used as control signal voltage, the first path of control signal voltage or the second path of control signal voltage is respectively connected to an EN pin and an SEL pin of a power control chip, and the voltage detection and comparison unit is arranged in the first path of input power, the voltage detection and comparison unit is used for detecting the first path of input voltage of a branch where the SEL pin is located, comparing the detected first path of input voltage with a preset reference voltage, and outputting a low-level or high-level digital signal as an SEL pin control signal of the power control chip according to a comparison result;
the outputting of the digital signal of low level or high level as the SEL pin control signal of the power control chip according to the comparison result specifically means:
when the voltage of the first path of input power supply is detected to be greater than the preset reference voltage, the voltage detection and comparison unit outputs a high-level digital signal as an SEL pin control signal of the power control chip according to the comparison result, and when the voltage of the first path of input power supply is detected to be less than the preset reference voltage, the voltage detection and comparison unit outputs a low-level digital signal as an SEL pin control signal of the power control chip according to the comparison result.
For further optimization, when the first path of input voltage or the second path of input voltage is used as a control signal voltage, the first path of control signal voltage or the second path of control signal voltage is respectively connected to an EN pin and an SEL pin of the power control chip, and the voltage detection and comparison unit is arranged in the second path of input power, the voltage detection and comparison unit is used for detecting the second path of input voltage of a branch where the EN pin is located, comparing the detected second path of input voltage with a preset reference voltage, and outputting a low-level or high-level digital signal as an EN pin control signal of the power control chip according to a comparison result;
the output low-level or high-level digital signal according to the comparison result is used as an EN pin control signal of the power control chip, and specifically means that:
when the voltage of the second input power supply is detected to be greater than the preset reference voltage, the voltage detection and comparison unit outputs a high-level digital signal as an EN pin control signal of the power control chip according to the comparison result, and when the voltage of the second input power supply is detected to be less than the preset reference voltage, the voltage detection and comparison unit outputs a low-level digital signal as an EN pin control signal of the power control chip according to the comparison result.
As a further optimization, the power control chip is configured to select the first input power or the second input power as an output according to different control signal states of the SEL pin or the EN pin, specifically:
when the voltage detection and comparison unit is arranged in the first path of input power supply, when an SEL pin or an EN pin of the power supply control chip receives a digital control signal with a high level, the first path of input power supply is selected as output, and when the SEL pin or the EN pin of the power supply control chip receives a digital control signal with a low level, the second path of input power supply is selected as output;
when the voltage detection and comparison unit is arranged in the second path of input power supply, the second path of input power supply is selected as output when the SEL pin or the EN pin of the power supply control chip receives a digital control signal with high level, and the first path of input power supply is selected as output when the SEL pin or the EN pin of the power supply control chip receives a digital control signal with low level.
As a further optimization, the voltage detection and comparison unit is preset with a hysteresis comparison window, and when the first path of input voltage or the second path of input voltage is compared with a preset reference voltage, and under the input voltage of a certain path of input power supply, the comparison result is inverted into a low-level digital control signal according to the comparison result:
if the output of the voltage detection and comparison unit is inverted into a high-level digital control signal, acquiring the fluctuation voltage of the corresponding input power supply, adjusting the hysteresis voltage to be larger than the fluctuation voltage of the input power supply, and increasing a preset voltage value on the basis of the input voltage of the path to enable the input voltage of the path to be larger than the sum of a preset reference voltage and the fluctuation voltage of the input power supply of the path.
In another aspect, the present invention further provides a control method for a power supply multiplexer, applied to the power supply multiplexer, including:
the power supply control chip is respectively supplied with power through the first path of input power supply and the second path of input power supply;
connecting the first path of input voltage serving as control signal voltage to an SEL pin of a power supply control chip, and connecting the second path of input voltage serving as control signal voltage to an EN pin of the power supply control chip; or, the first path of input voltage or the second path of input voltage is used as a control signal voltage, and the first path of control signal voltage or the second path of control signal voltage is respectively connected to an EN pin and an SEL pin of the power control chip;
detecting a first path of input voltage or a second path of input voltage by using a voltage detection and comparison unit, and comparing the detected first path of input voltage or second path of input voltage with a preset reference voltage;
outputting a digital signal of low level or high level as an SEL pin or EN pin control signal of the power control chip according to the comparison result;
the power supply control chip selects the first path of input power supply or the second path of input power supply as output according to different control signal states of the SEL pin or the EN pin.
The beneficial effects of the invention are: the power supply multiplexer and the control method thereof are characterized in that firstly, two paths of input power supplies are respectively used for supplying power to a power supply control chip, secondly, a first path of input voltage is used as control signal voltage to be connected to an SEL pin of the power supply control chip, a second path of input voltage is used as control signal voltage to be connected to an EN pin of the power supply control chip, or the first path of input voltage or the second path of input voltage is used as control signal voltage, the first path of control signal voltage or the second path of control signal voltage is respectively connected to the EN pin and the SEL pin of the power supply control chip, then, a voltage detection and comparison unit is used for detecting the first path of input voltage or the second path of input voltage, the detected first path of input voltage or second path of input voltage is compared with preset reference voltage, then, a digital signal with low level or high level is output according to a comparison result to be used as a control signal of the SEL pin or EN pin of the power supply control chip, and finally, the first path of input power supply or the second path of input power supply is selected as output according to different control signal states of the SEL pin and the EN pin.
When the chip using the power supply multiplexer is used for power supply input, the voltage of the first path of input power supply or the second path of input power supply can be accurately detected, and the input power supply is switched based on the preset reference voltage, so that the invention not only can control the two paths of input power supplies to be switched under a specific voltage value, but also can control the two paths of input power supplies to be switched under the condition that the voltage values of the two paths of input power supplies are completely the same, the consistency of the chip during power supply switching input is ensured, the oscillation caused when the input power supply is selected is avoided, and the reliability of system power supply control is ensured.
Drawings
FIG. 1 is a block diagram of a typical prior art power multiplexer;
FIG. 2 is a circuit diagram of a commonly used prior art power multiplexer;
fig. 3 is a schematic diagram of a circuit structure in which two input power supplies are used to provide control signals to an SEL pin and an EN pin of a power control chip in embodiment 1 of the present invention;
fig. 4 is a schematic diagram of a circuit structure in which only one input power supply is used to provide control signals to an SEL pin and an EN pin of a power control chip in embodiment 1 of the present invention;
fig. 5 is a flowchart of a control method of a power supply multiplexer according to embodiment 2 of the present invention;
VIN1 represents a first input Power supply, VIN2 represents a second input Power supply, VOUT represents an output end, C1 represents a first capacitor, C2 represents a second capacitor, C3 represents a third capacitor, C4 represents a fourth capacitor, C5 represents a fifth capacitor, C6 represents a sixth capacitor, C7 represents a seventh capacitor, C8 represents an eighth capacitor, C9 represents a ninth capacitor, GND represents a ground pin, RL represents a load, R1 represents a first divider resistor, R2 represents a second divider resistor, power Mux represents a Power supply multiplexer, SEL represents a first Logic Control pin, EN represents a second Logic Control pin, RCB represents a reverse-flowing prevention current protection circuit, control Logic and Gate drivers are Control Logic and Gate drive circuits, teSNS represents a temperature detection circuit, ST represents a state indication circuit, R7 represents a second Logic Control pin, and Gate drive circuits ST Is a voltage dividing resistor of the status indication circuit.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Example 1
The present embodiment provides a power supply multiplexer, wherein the multiplexer includes:
the first input power supply is used for providing a first input circuit voltage for a first power supply receiving end of the power supply control chip;
the second input power supply is used for providing a second input voltage to a second power supply receiving end of the power supply control chip;
the voltage detection and comparison unit is used for detecting the first path of input voltage or the second path of input voltage, comparing the detected first path of input voltage or the detected second path of input voltage with a preset reference voltage and outputting a low-level or high-level digital signal as a SEL pin or an EN pin control signal of the power control chip according to a comparison result when the first path of input voltage is used as a control signal voltage and the second path of input voltage is used as a control signal voltage and is connected to the EN pin and the SEL pin of the power control chip respectively;
and the power supply control chip is used for selecting the first path of input power supply or the second path of input power supply as output according to different control signal states of the SEL pin or the EN pin.
Therefore, the power supply multiplexer provided in this embodiment may use two input power supplies to provide the control signal to the SEL pin and the EN pin of the power supply control chip, or may use only one input power supply to provide the control signal to the SEL pin and the EN pin of the power supply control chip.
Specifically, for the case of providing control signals to the SEL pin and the EN pin of the power control chip by using two input power sources, when a first input voltage is connected to the SEL pin of the power control chip as a control signal voltage, a second input voltage is connected to the EN pin of the power control chip as a control signal voltage, and the voltage detection and comparison unit is disposed in the first input power source, it is used for detecting the first input voltage, comparing the detected first input voltage with a preset reference voltage, and outputting a digital signal of low level or high level as a SEL pin control signal of the power control chip according to the comparison result;
the outputting of the digital signal of low level or high level as the SEL pin control signal of the power control chip according to the comparison result specifically means:
when the voltage of the first path of input power supply is detected to be greater than the preset reference voltage, the voltage detection and comparison unit outputs a high-level digital signal as an SEL pin control signal of the power control chip according to the comparison result, and when the voltage of the first path of input power supply is detected to be less than the preset reference voltage, the voltage detection and comparison unit outputs a low-level digital signal as an SEL pin control signal of the power control chip according to the comparison result.
Meanwhile, when the first path of input voltage is used as a control signal voltage to be connected to an SEL pin of the power control chip, the second path of input voltage is used as a control signal voltage to be connected to an EN pin of the power control chip, and the voltage detection and comparison unit is arranged in the second path of input power, the voltage detection and comparison unit is used for detecting the second path of input voltage, comparing the detected second path of input voltage with a preset reference voltage, and outputting a digital signal with low level or high level as an EN pin control signal of the power control chip according to a comparison result;
the output low-level or high-level digital signal according to the comparison result is used as an EN pin control signal of the power control chip, and specifically means that:
when the voltage of the second input power supply is detected to be greater than the preset reference voltage, the voltage detection and comparison unit outputs a high-level digital signal as an EN pin control signal of the power control chip according to the comparison result, and when the voltage of the second input power supply is detected to be less than the preset reference voltage, the voltage detection and comparison unit outputs a low-level digital signal as an EN pin control signal of the power control chip according to the comparison result.
At this time, the power control chip is configured to select the first input power or the second input power as an output according to different control signal states of the SEL pin or the EN pin, specifically:
when the SEL pin of the power control chip receives a digital control signal with a high level, selecting a first path of input power as output, and when the SEL pin of the power control chip receives a digital control signal with a low level, selecting a second path of input power as output;
and when the EN pin of the power supply control chip receives the digital control signal with low level, the first path of input power supply is selected as output.
Referring to fig. 4, for the case that only one input power supply is used to provide Control signals to the SEL pin and the EN pin of the power Control chip, RCB is a reverse-flow-prevention current protection circuit, control Logic and Gate drivers are Control Logic and Gate driving circuits, temp SNS is a temperature detection circuit, ST is a state indication circuit, and R is a state indication circuit ST Is a voltage dividing resistor of the status indication circuit. When the first path of input voltage or the second path of input voltage is used as control signal voltage, the first path of control signal voltage or the second path of control signal voltage is respectively connected to an EN pin and an SEL pin of the power control chip, and the voltage detection and comparison unit is arranged in the first path of input power, the voltage detection and comparison unit is used for detecting the first path of input voltage of a branch where the SEL pin is located, comparing the detected first path of input voltage with a preset reference voltage, and outputting a low-level or high-level digital signal as an SEL pin control signal of the power control chip according to a comparison result;
the outputting of the digital signal of low level or high level as the SEL pin control signal of the power control chip according to the comparison result specifically means:
when the voltage of the first path of input power supply is detected to be greater than the preset reference voltage, the voltage detection and comparison unit outputs a high-level digital signal as an SEL pin control signal of the power control chip according to the comparison result, and when the voltage of the first path of input power supply is detected to be less than the preset reference voltage, the voltage detection and comparison unit outputs a low-level digital signal as an SEL pin control signal of the power control chip according to the comparison result.
Meanwhile, when the first path of input voltage or the second path of input voltage is used as control signal voltage, the first path of control signal voltage or the second path of control signal voltage is respectively connected to an EN pin and an SEL pin of the power control chip, and the voltage detection and comparison unit is arranged in the second path of input power, the voltage detection and comparison unit is used for detecting the second path of input voltage of a branch where the EN pin is located, comparing the detected second path of input voltage with preset reference voltage, and outputting a low-level or high-level digital signal as an EN pin control signal of the power control chip according to a comparison result;
the output low-level or high-level digital signal according to the comparison result is used as an EN pin control signal of the power control chip, and specifically means that:
when the voltage of the second input power supply is detected to be greater than the preset reference voltage, the voltage detection and comparison unit outputs a high-level digital signal as an EN pin control signal of the power control chip according to the comparison result, and when the voltage of the second input power supply is detected to be less than the preset reference voltage, the voltage detection and comparison unit outputs a low-level digital signal as an EN pin control signal of the power control chip according to the comparison result.
At this time, the power control chip is configured to select the first input power or the second input power as an output according to different control signal states of the SEL pin or the EN pin, specifically:
when the voltage detection and comparison unit is arranged in the first path of input power supply, when an SEL pin or an EN pin of the power supply control chip receives a digital control signal with a high level, the first path of input power supply is selected as output, and when the SEL pin or the EN pin of the power supply control chip receives a digital control signal with a low level, the second path of input power supply is selected as output;
when the voltage detection and comparison unit is arranged in the second path of input power supply, the second path of input power supply is selected as output when the SEL pin or the EN pin of the power supply control chip receives a digital control signal with high level, and the first path of input power supply is selected as output when the SEL pin or the EN pin of the power supply control chip receives a digital control signal with low level.
Referring to fig. 2, which is a circuit diagram of a conventional power multiplexer in the prior art, wherein SEL and EN are respectively controlled by two input power sources, in this application, since voltages of the two input power sources are analog signals, voltage values are uncertain, and particularly, in the switching process, a voltage on a VIN2 input pin fluctuates due to the conversion of the input power sources and the conversion of an output load, so that a level on a control pin EN switches back and forth at high and low levels, so that VOUT switches back and forth between VIN1 and VIN2, thereby causing output oscillation, and possibly resetting a system after power down.
Therefore, referring to fig. 3, it is a schematic diagram of a circuit structure of a power supply multiplexer in this embodiment, two input power supplies are used to provide control signals to an SEL pin and an EN pin of a power supply control chip, and it is a situation that two input power supplies are used to provide control signals to the SEL pin and the EN pin of the power supply control chip, where a seventh capacitor C7, an eighth capacitor C8, and a ninth capacitor C9 are also used for supplying power after energy storage, and GND is a ground pin. If the two paths of input power supplies in the circuit normally supply power, the power control chip can select the standby power supply of the second path of input power supply to supply power, and at the moment, the power control chip can control and close the power supply path of the default power supply of the first path of day power supply at the same time, so that the conventional power supply of the chip is realized through the power control chip.
Generally, a common default power supply generally includes a power adapter, a USB power supply, and the like, while a common standby power supply includes, but is not limited to, a storage battery, in this embodiment, the first input power supply is the storage battery, and the second input power supply is the power adapter of 5V, which is described in detail.
However, in the prior art, as shown in a commonly used circuit diagram of the power supply multiplexer shown in fig. 2, when a second input power supply is powered down, because the voltage input by the corresponding second input power supply is an analog signal, different power-on voltages may be set on an EN pin for different power supply control chips, that is, different power supply control chips may be set at an EN pin to sense that the second input power supply is 3V, and then powered up again if the second input power supply is less than 3V, and may be set at an EN pin to sense that the second input power supply is 3.5V, and then powered down again if the second input power supply is less than 3.5V, in such a case, because the voltage of the second input power supply is an analog signal, if the EN pin of the power supply control chip senses the set power-on and power-off voltages, it is necessary to accurately regulate a first voltage-dividing resistor R1 and a second voltage-dividing resistor R2 according to load and actual circuit conditions, and if the load and actual circuit conditions set on and power-off voltages of the EN pin are fixed, it is not necessary to accurately regulate the first voltage-dividing resistor R1 and the second voltage-dividing resistor R2, and the power supply control chip may not be necessary to frequently switch the same power supply chip, and to control chip, and it is not necessary to control chip to switch the power supply voltage of the same chip.
In practical application, in the above situation, if the second input power supply fails, the power control chip directly controls and switches to supply power through the first input power supply, at this time, there are many frequent power-off and power-on situations, which may cause the power control chip to frequently switch the input power supply, and if the operation of an operator is improper, the second input power supply is frequently powered off and powered on, or the second input power supply is loosened due to the service life of the second input power supply, thereby causing the second input power supply to be frequently powered on and powered off.
Therefore, in this embodiment, a voltage detection and comparison unit may be added between the second input power supply and the EN pin of the power control chip, and the voltage detection and comparison unit may precisely detect the voltage of the second input power supply, compare the voltage with an internal preset reference voltage, and output a low-level or high-level digital control signal to the EN pin of the power control chip according to a comparison result. Like this, no matter what kind of type of power control chip, no longer need set up at the EN pin and go up electric, power failure voltage, more need not go to adjust first divider resistor R1 and second divider resistor R2, but the analog signal of the voltage of the second way input power that detects with voltage detection with the predetermined reference voltage in the comparing element than can, voltage detection and comparing element can be according to a digital signal of comparison result direct output, promptly: when the voltage of the second input power supply is detected to be greater than the preset reference voltage, a high-level digital control signal is sent to an EN pin of the power supply control chip through the voltage detection and comparison unit, and the power supply control chip selects the second input power supply as an output to supply power at the moment; when the voltage of the second path of input power supply is detected to be smaller than the preset reference voltage, a low-level digital control signal is sent to an EN pin of the power supply control chip through the voltage detection and comparison unit, at the moment, the power supply control chip switches the input power supply, and the first path of input power supply is selected as the output to supply power. Therefore, the embodiment can realize that the input voltage values during output inversion are consistent, that is, the output can be inverted under the condition of the same input voltage value, and the stability of the system for controlling the input voltage switching is greatly increased.
Of course, a voltage detection and comparison unit may be added between the first input power and the SEL pin of the power control chip, and the voltage detection and comparison unit may precisely detect the voltage of the first input power, compare the voltage with an internal preset reference voltage, and output a low-level or high-level digital control signal to the SEL pin of the power control chip according to the comparison result.
It should be noted that, during actual application, for example, the plug is loose, then, the stable switching of the input power supply can be realized according to the technical scheme of this embodiment, but there may also be an oscillation caused by the fact that the output of the digital control signal of the EN pin switches back and forth between two input power supplies due to the switching of the input voltage, for this reason, in the voltage detection and comparison unit, a hysteresis comparison window may also be preset, that is: and the voltage detection and comparison unit is preset with a hysteresis comparison window, when a second path of input voltage is compared with a preset reference voltage, after the second path of input voltage is inverted into a low-level digital control signal according to a comparison result, if the output of the voltage detection and comparison unit is inverted into a high-level digital control signal, the fluctuation voltage of the second path of input power supply is obtained, the hysteresis voltage is adjusted to be greater than the fluctuation voltage of the second path of input power supply, and a preset voltage value is added on the basis of the second input voltage, so that the second path of input voltage is greater than the sum of the preset reference voltage and the fluctuation voltage of the second path of input power supply. That is to say, after the output of the voltage detection and comparison unit is inverted to be low under a certain input voltage, the output needs to be inverted to be high after a certain voltage value is added on the basis of the input voltage, so that the problem of back-and-forth switching of the output between two paths of input is avoided, and the stable switching of the system power supply is realized.
According to the technical scheme provided by this embodiment, the voltage detection and comparison unit may be disposed at the first input power supply to accurately detect the input voltage of the first input power supply, or may be disposed at the second input power supply to accurately detect the input power supply, and after the voltage detection and comparison unit detects the input voltage of the corresponding input power supply, the corresponding operating principles are consistent.
In this embodiment, for example, the preset reference voltage is 2V, the fluctuation voltage of the second input power supply is 200mV, the hysteresis comparison window value of the hysteresis comparison window is 2.5V, and the hysteresis voltage is 300mV, when the voltage detection and comparison unit detects that the second input voltage is less than 2V, the power supply control chip controls the first input power supply to perform power supply output, and when the second input power supply is powered on, the second input voltage needs to be increased to more than 2.2V, so that the second input voltage can be turned over from low to high.
In addition, according to needs, the hysteresis comparison window value in the voltage detection and comparison unit can be adjusted in the embodiment, so that oscillation caused by back-and-forth switching of output between two input power supplies due to back-and-forth rebounding of a control signal during input voltage switching is avoided, and the stability of system power supply switching is ensured.
It should be noted that, if the first input power supply and the second input power supply are identical, the above power supply multiplexer provided by this embodiment may also be used, and the voltage detection and comparison unit is used to implement accurate detection and identification of the two input power supplies, so that the power supply control chip selects a suitable corresponding input power supply as an output, thereby implementing switching of the input power supplies, and ensuring stable power supply of the chip power supply system without oscillation.
Example 2
Applied to the power supply multiplexer provided in embodiment 1, the present embodiment provides a control method of the power supply multiplexer, and a flowchart thereof is shown in fig. 5, wherein the method includes:
s1, supplying power to a power control chip through a first path of input power supply and a second path of input power supply respectively;
s2, connecting the first path of input voltage serving as control signal voltage to an SEL pin of a power supply control chip, and connecting the second path of input voltage serving as control signal voltage to an EN pin of the power supply control chip; or, the first path of input voltage or the second path of input voltage is used as a control signal voltage, and the first path of control signal voltage or the second path of control signal voltage is respectively connected to an EN pin and an SEL pin of the power control chip;
s3, detecting a first path of input voltage or a second path of input voltage by using a voltage detection and comparison unit, and comparing the detected first path of input voltage or second path of input voltage with a preset reference voltage;
s4, outputting a low-level or high-level digital signal as an SEL pin or EN pin control signal of the power control chip according to the comparison result;
and S5, the power supply control chip selects the first path of input power supply or the second path of input power supply as output according to different control signal states of the SEL pin and the EN pin.
Similarly, in this embodiment, the power supply control method is the same as that in embodiment 1, in the case that two input power supplies are used to provide control signals to the SEL pin and the EN pin of the power supply control chip, under the normal power supply condition, the second input power supply can also supply power, the voltage detection and comparison unit can detect the second input voltage of the second input power supply in real time and compare the second input voltage with the preset reference voltage, when the second input voltage is smaller than the preset reference voltage, the voltage detection and comparison unit sends a low-level digital control signal to the EN pin of the power supply control chip, at this time, the power supply control chip selects the first input power supply as an output, and when the second input voltage of the second input power supply is smaller than the preset reference voltage, the voltage detection and comparison unit sends a high-level digital control signal to the EN pin of the power supply control chip, at this time, the power supply control chip switches the input power supply to the second input power supply as an output, so that the consistency of all chips in switching power supply input can be realized.
In addition, referring to embodiment 1, in order to avoid the problem that the output of the digital control signal of the EN pin is switched back and forth between two input power supplies to cause oscillation due to the fact that the output is switched back and forth when the input voltage is switched, a hysteresis comparison window is preset in the voltage detection and comparison unit, and after the output of the voltage detection and comparison unit is switched to be low under a certain input voltage, a certain voltage value needs to be added on the basis of the input voltage to be switched to be high, so that the problem that the output is switched back and forth between two input power supplies is avoided, and the stable switching of the system power supply is realized.
Therefore, the invention can control the two input power supplies to be switched under a specific voltage value, and can also be switched even under the condition that the voltage values of the two input power supplies are completely the same, so that the chips can be ensured to be consistent when the power supplies are switched, the oscillation caused when the input power supplies are selected is avoided, and the reliability of the power supply control of the system is ensured.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (9)

1. A power multiplexer, comprising:
the first input power supply is used for providing a first input circuit voltage for a first power supply receiving end of the power supply control chip;
the second input power supply is used for providing a second input voltage to a second power supply receiving end of the power supply control chip;
the voltage detection and comparison unit is used for detecting the first path of input voltage or the second path of input voltage, comparing the detected first path of input voltage or the detected second path of input voltage with a preset reference voltage and outputting a low-level or high-level digital signal as a SEL pin or an EN pin control signal of the power control chip according to a comparison result when the first path of input voltage is used as a control signal voltage and the second path of input voltage is used as a control signal voltage and is connected to the EN pin and the SEL pin of the power control chip respectively;
and the power supply control chip is used for selecting the first path of input power supply or the second path of input power supply as output according to different control signal states of the SEL pin or the EN pin.
2. The power supply multiplexer according to claim 1, wherein when the first input voltage is connected to the SEL pin of the power control chip as the control signal voltage, the second input voltage is connected to the EN pin of the power control chip as the control signal voltage, and the voltage detection and comparison unit is disposed in the first input power supply, it is configured to detect the first input voltage, compare the detected first input voltage with a preset reference voltage, and output a low-level or high-level digital signal as the SEL pin control signal of the power control chip according to the comparison result;
the outputting of the digital signal of low level or high level as the SEL pin control signal of the power control chip according to the comparison result specifically means:
when the voltage of the first path of input power supply is detected to be greater than the preset reference voltage, the voltage detection and comparison unit outputs a high-level digital signal as an SEL pin control signal of the power control chip according to the comparison result, and when the voltage of the first path of input power supply is detected to be less than the preset reference voltage, the voltage detection and comparison unit outputs a low-level digital signal as an SEL pin control signal of the power control chip according to the comparison result.
3. The power supply multiplexer according to claim 1, wherein when the first input voltage is connected to a SEL pin of the power control chip as a control signal voltage, the second input voltage is connected to an EN pin of the power control chip as a control signal voltage, and the voltage detection and comparison unit is disposed in the second input power, it is configured to detect the second input voltage, compare the detected second input voltage with a preset reference voltage, and output a digital signal of a low level or a high level as an EN pin control signal of the power control chip according to a comparison result;
the output low-level or high-level digital signal according to the comparison result is used as an EN pin control signal of the power control chip, and specifically means that:
when the voltage of the second input power supply is detected to be greater than the preset reference voltage, the voltage detection and comparison unit outputs a high-level digital signal as an EN pin control signal of the power control chip according to the comparison result, and when the voltage of the second input power supply is detected to be less than the preset reference voltage, the voltage detection and comparison unit outputs a low-level digital signal as an EN pin control signal of the power control chip according to the comparison result.
4. The power supply multiplexer according to claim 2 or 3, wherein the power supply control chip is configured to select the first input power supply or the second input power supply as an output according to different control signal states of a SEL pin or an EN pin, specifically:
when the SEL pin of the power control chip receives a digital control signal with a high level, selecting a first path of input power as output, and when the SEL pin of the power control chip receives a digital control signal with a low level, selecting a second path of input power as output;
and when the EN pin of the power supply control chip receives a digital control signal with a low level, the first input power supply is selected as output.
5. The power supply multiplexer according to claim 1, wherein when the first path of input voltage or the second path of input voltage is used as the control signal voltage, and the first path of control signal voltage or the second path of control signal voltage is respectively connected to an EN pin and a SEL pin of the power supply control chip, and the voltage detection and comparison unit is disposed in the first path of input power supply, it is used for detecting the first path of input voltage of a branch where the SEL pin is located, comparing the detected first path of input voltage with a preset reference voltage, and outputting a low-level or high-level digital signal as a SEL pin control signal of the power supply control chip according to the comparison result;
the output of the digital signal of low level or high level according to the comparison result is used as the SEL pin control signal of the power control chip, which specifically means:
when the voltage of the first path of input power supply is detected to be greater than the preset reference voltage, the voltage detection and comparison unit outputs a high-level digital signal as an SEL pin control signal of the power control chip according to the comparison result, and when the voltage of the first path of input power supply is detected to be less than the preset reference voltage, the voltage detection and comparison unit outputs a low-level digital signal as an SEL pin control signal of the power control chip according to the comparison result.
6. The power supply multiplexer according to claim 5, wherein when the first path of input voltage or the second path of input voltage is used as the control signal voltage, and the first path of control signal voltage or the second path of control signal voltage is respectively connected to an EN pin and a SEL pin of the power supply control chip, and the voltage detection and comparison unit is disposed in the second path of input power supply, it is used for detecting the second path of input voltage of a branch where the EN pin is located, comparing the detected second path of input voltage with a preset reference voltage, and outputting a low-level or high-level digital signal as an EN pin control signal of the power supply control chip according to the comparison result;
the output low level or high level digital signal according to the comparison result is used as an EN pin control signal of the power control chip, and specifically means:
when the voltage of the second input power supply is detected to be greater than the preset reference voltage, the voltage detection and comparison unit outputs a high-level digital signal as an EN pin control signal of the power control chip according to the comparison result, and when the voltage of the second input power supply is detected to be less than the preset reference voltage, the voltage detection and comparison unit outputs a low-level digital signal as an EN pin control signal of the power control chip according to the comparison result.
7. The power supply multiplexer according to claim 5 or 6, wherein the power supply control chip is configured to select the first input power supply or the second input power supply as an output according to different control signal states of a SEL pin or an EN pin, specifically:
when the voltage detection and comparison unit is arranged in the first path of input power supply, when the SEL pin or the EN pin of the power supply control chip receives a digital control signal with a high level, the first path of input power supply is selected as output, and when the SEL pin or the EN pin of the power supply control chip receives a digital control signal with a low level, the second path of input power supply is selected as output;
when the voltage detection and comparison unit is arranged in the second path of input power supply, the second path of input power supply is selected as output when the SEL pin or the EN pin of the power supply control chip receives a digital control signal with high level, and the first path of input power supply is selected as output when the SEL pin or the EN pin of the power supply control chip receives a digital control signal with low level.
8. The power supply multiplexer according to claim 1, wherein the voltage detecting and comparing unit is preset with a hysteresis comparison window, and when comparing the first input voltage or the second input voltage with a preset reference voltage, and under the input voltage of a certain input power supply, after inverting to a low-level digital control signal according to the comparison result:
if the output of the voltage detection and comparison unit is inverted into a high-level digital control signal, acquiring the fluctuation voltage of the corresponding input power supply, adjusting the hysteresis voltage to be larger than the fluctuation voltage of the input power supply, and increasing a preset voltage value on the basis of the input voltage of the path to enable the input voltage of the path to be larger than the sum of a preset reference voltage and the fluctuation voltage of the input power supply of the path.
9. A control method of a power supply multiplexer applied to a power supply multiplexer according to any one of claims 1 to 8, comprising:
the power supply control chip is respectively supplied with power through the first path of input power supply and the second path of input power supply;
connecting the first path of input voltage serving as control signal voltage to an SEL pin of a power supply control chip, and connecting the second path of input voltage serving as control signal voltage to an EN pin of the power supply control chip; or, the first path of input voltage or the second path of input voltage is used as a control signal voltage, and the first path of control signal voltage or the second path of input voltage is respectively connected to an EN pin and an SEL pin of the power control chip;
detecting a first path of input voltage or a second path of input voltage by using a voltage detection and comparison unit, and comparing the detected corresponding path of input voltage with a preset reference voltage;
outputting a digital signal of low level or high level as an SEL pin or EN pin control signal of the power control chip according to the comparison result;
the power control chip selects the first path of input power or the second path of input power as output according to different control signal states of the SEL pin or the EN pin.
CN202211588856.6A 2022-12-12 2022-12-12 Power supply multiplexer and control method thereof Active CN115589133B (en)

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Citations (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6856173B1 (en) * 2003-09-05 2005-02-15 Freescale Semiconductor, Inc. Multiplexing of digital signals at multiple supply voltages in an integrated circuit
CN102082461A (en) * 2009-11-30 2011-06-01 中强光电股份有限公司 Power supply switching device and method as well as projection device applying power supply switching device
CN102130492A (en) * 2010-07-31 2011-07-20 华为技术有限公司 Device and method for selecting power supply
CN202134953U (en) * 2011-02-15 2012-02-01 深圳市锐能微科技有限公司 Power supply switching circuit
US20140139029A1 (en) * 2012-11-21 2014-05-22 Stmicroelectronics S.R.L. Dual input single output regulator for an inertial sensor
JP2015103860A (en) * 2013-11-21 2015-06-04 富士通セミコンダクター株式会社 Power supply switching control circuit and power supply switching circuit
JP2015216590A (en) * 2014-05-13 2015-12-03 Tdk株式会社 Load drive device
CN106019999A (en) * 2016-07-14 2016-10-12 合肥联宝信息技术有限公司 Power control chip and electronic device provided with chip
US20170063373A1 (en) * 2015-09-02 2017-03-02 U.S.A. As Represented By The Administrator Of The National Aeronautics And Space Administration Multiplexer
CN107222102A (en) * 2016-03-21 2017-09-29 矽力杰半导体技术(杭州)有限公司 A kind of ON-OFF control circuit and control method
CN207098741U (en) * 2017-05-03 2018-03-13 杭州海康威视数字技术股份有限公司 A kind of dual power supply switching circuit
CN208874344U (en) * 2018-08-06 2019-05-17 北京恒源利通电力技术有限公司 Main power source and backup power source switching circuit and switching device
CN209170219U (en) * 2018-12-24 2019-07-26 南京屹信航天科技有限公司 A kind of more power circuits for satellite borne equipment
CN210053245U (en) * 2019-02-22 2020-02-11 欧姆(重庆)电子技术有限公司 Dual-power switching device and system
US20200076430A1 (en) * 2018-08-28 2020-03-05 Texas Instruments Incorporated Power source multiplexer with adaptive switch control
CN214755708U (en) * 2021-04-02 2021-11-16 北京军陶科技有限公司 Dual-input power supply control circuit with constant voltage switching
CN113690998A (en) * 2021-08-17 2021-11-23 西南大学 Multi-mode energy management system and method
CN216121906U (en) * 2021-08-30 2022-03-22 广州力森电子有限公司 Automatic switching device for double-circuit power supply
CN216599115U (en) * 2021-12-07 2022-05-24 深圳市康冠医疗设备有限公司 Dual-power seamless switching system
CN114977468A (en) * 2022-05-25 2022-08-30 深圳市爱协生科技有限公司 Dual-power switching circuit and power architecture
CN115133646A (en) * 2022-09-01 2022-09-30 陕西中科天地航空模块有限公司 Power supply path control circuit with priority

Patent Citations (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6856173B1 (en) * 2003-09-05 2005-02-15 Freescale Semiconductor, Inc. Multiplexing of digital signals at multiple supply voltages in an integrated circuit
CN102082461A (en) * 2009-11-30 2011-06-01 中强光电股份有限公司 Power supply switching device and method as well as projection device applying power supply switching device
CN102130492A (en) * 2010-07-31 2011-07-20 华为技术有限公司 Device and method for selecting power supply
CN202134953U (en) * 2011-02-15 2012-02-01 深圳市锐能微科技有限公司 Power supply switching circuit
US20140139029A1 (en) * 2012-11-21 2014-05-22 Stmicroelectronics S.R.L. Dual input single output regulator for an inertial sensor
JP2015103860A (en) * 2013-11-21 2015-06-04 富士通セミコンダクター株式会社 Power supply switching control circuit and power supply switching circuit
JP2015216590A (en) * 2014-05-13 2015-12-03 Tdk株式会社 Load drive device
US20170063373A1 (en) * 2015-09-02 2017-03-02 U.S.A. As Represented By The Administrator Of The National Aeronautics And Space Administration Multiplexer
CN107222102A (en) * 2016-03-21 2017-09-29 矽力杰半导体技术(杭州)有限公司 A kind of ON-OFF control circuit and control method
CN106019999A (en) * 2016-07-14 2016-10-12 合肥联宝信息技术有限公司 Power control chip and electronic device provided with chip
CN207098741U (en) * 2017-05-03 2018-03-13 杭州海康威视数字技术股份有限公司 A kind of dual power supply switching circuit
CN208874344U (en) * 2018-08-06 2019-05-17 北京恒源利通电力技术有限公司 Main power source and backup power source switching circuit and switching device
US20200076430A1 (en) * 2018-08-28 2020-03-05 Texas Instruments Incorporated Power source multiplexer with adaptive switch control
CN209170219U (en) * 2018-12-24 2019-07-26 南京屹信航天科技有限公司 A kind of more power circuits for satellite borne equipment
CN210053245U (en) * 2019-02-22 2020-02-11 欧姆(重庆)电子技术有限公司 Dual-power switching device and system
CN214755708U (en) * 2021-04-02 2021-11-16 北京军陶科技有限公司 Dual-input power supply control circuit with constant voltage switching
CN113690998A (en) * 2021-08-17 2021-11-23 西南大学 Multi-mode energy management system and method
CN216121906U (en) * 2021-08-30 2022-03-22 广州力森电子有限公司 Automatic switching device for double-circuit power supply
CN216599115U (en) * 2021-12-07 2022-05-24 深圳市康冠医疗设备有限公司 Dual-power seamless switching system
CN114977468A (en) * 2022-05-25 2022-08-30 深圳市爱协生科技有限公司 Dual-power switching circuit and power architecture
CN115133646A (en) * 2022-09-01 2022-09-30 陕西中科天地航空模块有限公司 Power supply path control circuit with priority

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