CN115589133B - Power supply multiplexer and control method thereof - Google Patents

Power supply multiplexer and control method thereof Download PDF

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Publication number
CN115589133B
CN115589133B CN202211588856.6A CN202211588856A CN115589133B CN 115589133 B CN115589133 B CN 115589133B CN 202211588856 A CN202211588856 A CN 202211588856A CN 115589133 B CN115589133 B CN 115589133B
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power supply
voltage
path
pin
input
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CN115589133A (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

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Control Of Voltage And Current In General (AREA)
  • Direct Current Feeding And Distribution (AREA)

Abstract

The invention provides a power supply multiplexer and a control method thereof, wherein: the power supply control chip is powered by two paths of input power supplies respectively, the first path of input voltage and the second path of input voltage are respectively connected to the SEL pin and the EN pin as control signal voltages, or the first path of input voltage or the second path of input voltage is respectively connected to the EN pin and the SEL pin, the voltage detection and comparison unit is utilized to detect the corresponding path of input voltage and compare the corresponding path of input voltage with a preset reference voltage, a low-level or high-level digital signal is output as the SEL pin or the 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 paths of input power supplies to switch under a specific voltage value, and can switch even if the voltage values of the two paths of input power supplies are identical, so that the chips are ensured to be consistent when the power supplies are switched.

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 multiplexer selects between two input power paths and converts them into a single output with protection. The power multiplexer selects between barrel jacks, USB, wireless charging, backup power, battery and other inputs. In addition, these devices also facilitate applications requiring a fast or seamless switching response, thereby ensuring that the system does not reset during power transitions.
The conventional power supply multiplexer needs two separate control signals to control the selection of the input power supply, and this control mode needs a peripheral control device to provide independent digital control signals, but more and more practical application control signals are provided by the input power supply itself, and the input power supply voltage is an analog signal, so that the output is easily powered down due to unstable control signals when the two input power supplies are switched.
Referring to fig. 1, an application block diagram of a typical Power supply multiplexer is shown, where VIN1 and VIN2 are two Power inputs, power Mux is a Power supply multiplexer, GND is a ground pin, VOUT selects one of the two Power inputs to supply to a subsequent circuit through two switches, and the first capacitor C1, the second capacitor C2 and the third capacitor C3 are used to store energy and release electric quantity, 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, 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 level or low level, no middle gray state exists, however, in the case, the EN and the SEL digital control signals are required to be independently accessed by using an additional control circuit or an additional control chip, and because the application scene of the power supply multiplexer is wide, the EN and the SEL are mostly used together with the control chip or a power supply chip, and therefore, the addition of the additional control circuit or the additional control chip occupies more chip packaging space in a mode of the EN and the SEL digital control signal, and more software and hardware resources are also input.
Referring to fig. 2, a circuit diagram of a common use of a power multiplexer is shown, where SEL and EN are controlled by two input power sources respectively, GND is a ground pin, a fourth capacitor C4, a fifth capacitor C5 and a sixth capacitor C6 are used to store energy and release electric quantity, a first voltage dividing resistor R1 and a second voltage dividing resistor R2 are used to divide voltage, in this application, since the voltages of the two input power sources are analog signals, the voltage values are uncertain, especially during switching, the voltage on the input pin VIN2 will fluctuate due to the conversion of the input power sources and the conversion of the output load, meanwhile, since the EN pin is re-electrified after losing, the voltage on the EN pin is not specific, so that the level on the EN pin can be switched back and forth at the high level and the low level, VOUT can be switched back and forth between VIN1 and VIN2, thereby causing output oscillation, and possible power-down reset of the system.
Disclosure of Invention
The invention aims to provide a power supply multiplexer and a control method thereof, which not only can control two paths of input power supplies to switch under a specific voltage value, but also can switch even if the voltage values of the two paths of input power supplies are identical, so that a chip can ensure consistency when switching power supplies for input, avoid oscillation caused by selecting the input power supplies, and ensure the reliability of power supply control of a system.
The invention solves the technical problems and adopts the following technical scheme:
in one aspect, the present invention provides a power supply multiplexer comprising:
the first path of input power supply is used for providing a first input path voltage for a first power supply receiving end of the power supply control chip;
the second path of input power is used for providing a second path of input voltage for a second power receiving end of the power 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 when the first path of input voltage is used as the control signal voltage to be connected to an SEL pin of the power supply control chip and the second path of input voltage is used as the control signal voltage to be connected to an EN pin of the power supply control chip or 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 the EN pin and the SEL pin of the power supply control chip, 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 the SEL pin or the EN pin control signal of the power supply control chip according to a comparison result;
The power supply control chip is used for selecting a first path of input power supply or a second path of input power supply as output according to different control signal states of the SEL pin or the EN pin.
As a further optimization, when the first path of input voltage is used as a control signal voltage to be connected to the SEL pin of the power supply control chip, the second path of input voltage is used as a control signal voltage to be connected to the EN pin of the power supply control chip, and the voltage detection and comparison unit is arranged in the first path of input power supply, 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 a preset reference voltage, and outputting a low-level or high-level digital signal as the SEL pin control signal of the power supply control chip according to the comparison result;
the SEL pin control signal of the power control chip, which outputs a low-level or high-level digital signal according to the comparison result, specifically refers to:
when the voltage of the first path of input power supply is detected to be larger 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 supply control chip according to the comparison result, and when the voltage of the first path of input power supply is detected to be smaller 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 supply control chip according to the comparison result.
As a further optimization, when the first path of input voltage is used as a control signal voltage to be connected to the SEL pin of the power supply control chip, the second path of input voltage is used as a control signal voltage to be connected to the EN pin of the power supply control chip, and the voltage detection and comparison unit is arranged in the second path of input power supply, 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 the EN pin control signal of the power supply control chip according to the comparison result;
the digital signal of low level or high level is output as EN pin control signal of the power control chip according to the comparison result, specifically means:
when the voltage of the second path of input power supply is detected to be larger 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 supply control chip according to the comparison result, and when the voltage of the second path of input power supply is detected to be smaller 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 supply control chip according to the comparison result.
As a further optimization, the power control chip is configured to select a first path of input power or a second path of input power as output according to different control signal states of an SEL pin or an EN pin, and specifically refers to:
when the SEL pin of the power supply control chip receives a high-level digital control signal, a first path of input power supply is selected as output, and when the SEL pin of the power supply control chip receives a low-level digital control signal, a second path of input power supply is selected as output;
when the EN pin of the power supply control chip receives a high-level digital control signal, the second path of input power supply is selected as output, and when the EN pin of the power supply control chip receives a low-level digital control signal, the first path of input power supply is selected as output.
As a 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 supply control chip, and the voltage detection and comparison unit is arranged in the first path of input power supply, 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 supply control chip according to a comparison result;
The SEL pin control signal of the power control chip, which outputs a low-level or high-level digital signal according to the comparison result, specifically refers to:
when the voltage of the first path of input power supply is detected to be larger 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 supply control chip according to the comparison result, and when the voltage of the first path of input power supply is detected to be smaller 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 supply control chip according to the comparison result.
As a 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 a power supply control chip, and the voltage detection and comparison unit is arranged in the second path of input power supply, the voltage detection and comparison unit is used for detecting the second path of input voltage of a branch circuit where the EN pin is positioned, 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 a comparison result;
The digital signal of low level or high level is output as EN pin control signal of the power control chip according to the comparison result, specifically means:
when the voltage of the second path of input power supply is detected to be larger 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 supply control chip according to the comparison result, and when the voltage of the second path of input power supply is detected to be smaller 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 supply control chip according to the comparison result.
As a further optimization, the power control chip is configured to select a first path of input power or a second path of input power as output according to different control signal states of an SEL pin or an EN pin, and specifically refers to:
when the voltage detection and comparison unit is arranged in the first path of input power supply, the first path of input power supply is selected to be used as output when the SEL pin or the EN pin of the power supply control chip receives a high-level digital control signal, and the second path of input power supply is selected to be used as output when the SEL pin or the EN pin of the power supply control chip receives a low-level digital control signal;
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 to be used as output when the SEL pin or the EN pin of the power supply control chip receives a high-level digital control signal, and the first path of input power supply is selected to be used as output when the SEL pin or the EN pin of the power supply control chip receives a low-level digital control signal.
As a further optimization, the voltage detection and comparison unit is preset with a hysteresis comparison window, when the first path of input voltage or the second path of input voltage is compared with a preset reference voltage, under the input voltage of a certain path of input power supply, the comparison result is turned into a low-level digital control signal, and then:
if the output of the voltage detection and comparison unit is turned to a high-level digital control signal, the fluctuation voltage of the input power supply of the corresponding path is obtained, the hysteresis voltage is adjusted to be larger than the fluctuation voltage of the input power supply of the path, and a preset voltage value is increased on the basis of the input voltage of the path, so that the input voltage of the path is larger than the sum of the preset reference voltage and the fluctuation voltage of the input power supply of the path.
On the other hand, the invention also provides a control method of the power supply multiplexer, which is applied to the power supply multiplexer and comprises the following steps:
The power supply control chip is powered by the first path of input power supply and the second path of input power supply respectively;
connecting the first path of input voltage as control signal voltage to an SEL pin of the power control chip, and connecting the second path of input voltage as control signal voltage to an EN pin of the power control chip; or, the first path of input voltage or the second path of input voltage is used as 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;
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 low-level or high-level digital signal as a SEL pin or an EN pin control signal of the power control chip according to the comparison result;
the power control chip selects a first path of input power or a second path of input power as output according to different control signal states of the SEL pin or the EN pin.
The beneficial effects of the invention are as follows: according to the power supply multiplexer and the control method thereof, firstly, power is supplied to a power supply control chip through two paths of input power supplies respectively, 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 to be connected to the EN pin and the SEL pin of the power supply control chip respectively, 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 the detected second path of input voltage is compared with a preset reference voltage, then, a low-level or high-level digital signal is output as the SEL pin or the EN pin control signal of the power supply control chip according to comparison results, 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 inputs power supply, the power supply multiplexer can accurately detect the voltage of the first path of input power supply or the second path of input power supply and switch the input power supply based on the preset reference voltage, so that the power supply multiplexer can control the two paths of input power supplies to switch under a specific voltage value, and can switch even if the voltage values of the two paths of input power supplies are identical, the chip can ensure consistency when switching the power supply inputs, the oscillation caused by selecting the input power supply is avoided, and the reliability of power supply control of the system is ensured.
Drawings
FIG. 1 is a block diagram of a typical power supply multiplexer of the prior art;
FIG. 2 is a circuit diagram of a conventional power supply multiplexer;
FIG. 3 is a schematic circuit diagram of a power control chip according to embodiment 1 of the present invention, wherein two paths of input power are used to provide control signals to the SEL pin and the EN pin of the power control chip;
fig. 4 is a schematic circuit diagram of a circuit structure for providing control signals to the SEL pin and the EN pin of the power control chip by using only one input power supply in embodiment 1 of the present invention;
FIG. 5 is a flow chart of a control method of a power supply multiplexer in the embodiment 2 of the present invention;
Wherein VIN1 represents a first input Power supply, VIN2 represents a second input Power supply, VOUT represents an output terminal, 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 voltage dividing resistor, R2 represents a second voltage dividing resistor, power Mux represents a Power multiplexer, SEL represents a first logic control pin, EN represents a second logic control pin, RCB is a backflow prevention current protection circuit, control Logic and Gate drivers is a control logic and gate driving circuit, temp is a temperature detection circuit, ST is a state indication circuit, R ST Is the voltage dividing resistance of the status indicating circuit.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. The components of the 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 path of input power supply is used for providing a first input path voltage for a first power supply receiving end of the power supply control chip;
the second path of input power is used for providing a second path of input voltage for a second power receiving end of the power 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 when the first path of input voltage is used as the control signal voltage to be connected to an SEL pin of the power supply control chip and the second path of input voltage is used as the control signal voltage to be connected to an EN pin of the power supply control chip or 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 the EN pin and the SEL pin of the power supply control chip, 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 the SEL pin or the EN pin control signal of the power supply control chip according to a comparison result;
the power supply control chip is used for selecting a first path of input power supply or a 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 multiplexer provided in this embodiment may use two paths of input power to provide control signals to the SEL pin and the EN pin of the power control chip, or may use only one path of input power to provide control signals to the SEL pin and the EN pin of the power control chip.
Specifically, for the case of using two paths of input power sources to provide control signals to the SEL pin and the EN pin of the power control chip, when a first path of input voltage is connected to the SEL pin of the power control chip as a control signal voltage, a second path of 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 provided in the first path of input power source, it is used to detect the first path of input voltage, compare the detected first path of 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 SEL pin control signal of the power control chip, which outputs a low-level or high-level digital signal according to the comparison result, specifically refers to:
when the voltage of the first path of input power supply is detected to be larger 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 supply control chip according to the comparison result, and when the voltage of the first path of input power supply is detected to be smaller 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 supply control chip according to the comparison result.
Meanwhile, when the first path of input voltage is used as control signal voltage to be connected to an SEL pin of the power supply control chip, the second path of input voltage is used as control signal voltage to be connected to an EN pin of the power supply control chip, and the voltage detection and comparison unit is arranged in the second path of input power supply and 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 supply control chip according to a comparison result;
the digital signal of low level or high level is output as EN pin control signal of the power control chip according to the comparison result, specifically means:
when the voltage of the second path of input power supply is detected to be larger 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 supply control chip according to the comparison result, and when the voltage of the second path of input power supply is detected to be smaller 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 supply control chip according to the comparison result.
At this time, the power control chip is configured to select 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, specifically referring to:
When the SEL pin of the power supply control chip receives a high-level digital control signal, a first path of input power supply is selected as output, and when the SEL pin of the power supply control chip receives a low-level digital control signal, a second path of input power supply is selected as output;
when the EN pin of the power supply control chip receives a high-level digital control signal, the second path of input power supply is selected as output, and when the EN pin of the power supply control chip receives a low-level digital control signal, the first path of input power supply is selected as output.
Referring to FIG. 4, for the case of providing control signals to the SEL pin and the EN pin of the power control chip using only one input power source, wherein RCB is a reverse current protection circuit, control Logic and Gate drivers is a control logic and gate drive circuit, temp SNS is a temperature detection circuit, ST is a status indication circuit, R ST Is the voltage dividing resistance of the status indicating circuit. 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 a power supply control chip, and the voltage detection and comparison unit is arranged in the first path of input power supply and is used for detecting the first path of input voltage of a branch where the SEL pin is positioned, comparing the detected first path of input voltage with a preset reference voltage, and outputting a low-level or high-level digital signal as the SEL pin control signal of the power supply control chip according to a comparison result;
The SEL pin control signal of the power control chip, which outputs a low-level or high-level digital signal according to the comparison result, specifically refers to:
when the voltage of the first path of input power supply is detected to be larger 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 supply control chip according to the comparison result, and when the voltage of the first path of input power supply is detected to be smaller 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 supply 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 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 a power supply control chip, and the voltage detection and comparison unit is arranged in the second path of input power supply, the voltage detection and comparison unit is used for detecting the second path of input voltage of a branch circuit where the EN pin is arranged, 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 a comparison result;
The digital signal of low level or high level is output as EN pin control signal of the power control chip according to the comparison result, specifically means:
when the voltage of the second path of input power supply is detected to be larger 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 supply control chip according to the comparison result, and when the voltage of the second path of input power supply is detected to be smaller 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 supply control chip according to the comparison result.
At this time, the power control chip is configured to select 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, specifically referring to:
when the voltage detection and comparison unit is arranged in the first path of input power supply, the first path of input power supply is selected to be used as output when the SEL pin or the EN pin of the power supply control chip receives a high-level digital control signal, and the second path of input power supply is selected to be used as output when the SEL pin or the EN pin of the power supply control chip receives a low-level digital control signal;
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 to be used as output when the SEL pin or the EN pin of the power supply control chip receives a high-level digital control signal, and the first path of input power supply is selected to be used as output when the SEL pin or the EN pin of the power supply control chip receives a low-level digital control signal.
Referring to fig. 2, a circuit diagram of a conventional power multiplexer is shown, in which SEL and EN are controlled by two input power sources respectively, in which in this application, since the voltages of the two input power sources are analog signals, the voltage values are uncertain, and especially in the switching process, the voltage on the VIN2 input pin fluctuates due to the conversion of the input power source and the conversion of the output load, so that the level on the control pin EN can be switched back and forth at a high level and a low level, and VOUT can be switched back and forth between VIN1 and VIN2, thereby causing output oscillation, and possibly resetting the system when power is lost.
For this reason, referring to fig. 3, which is a schematic circuit diagram of a power multiplexer in this embodiment, two paths of input power supplies are used to provide control signals to the SEL pin and the EN pin of the power control chip, which is a case of using two paths of input power supplies to provide control signals to the SEL pin and the EN pin of the power control chip, where the seventh capacitor C7, the eighth capacitor C8 and the ninth capacitor C9 are also used for power supply after energy storage, GND is a ground pin, in an actual use process, if the second path of input power supply is not turned on, only the first path of input power supply is turned on, the power control chip controls the first path of input power supply to supply power, and in general, in order to ensure continuous and stable power supply, the second path of input power supply can be turned on to supply power, and the second path of input power supply is used as a standby power supply, and the first path of input power supply is used as a default power supply. If the two paths of input power supplies in the circuit are all normally powered, the power supply control chip can select a standby power supply of the second path of input power supply to be powered, and at the moment, the power supply control chip can control a power supply path of a default power supply for closing the first path of the day power supply at the same time, so that the conventional power supply of the chip is realized through the power supply control chip.
Generally, the default power supply used in the present embodiment is a power adapter, a USB power supply, etc., and the standby power supply used in the present embodiment includes, but is not limited to, a storage battery, and in this embodiment, the first input power supply is used as the storage battery, and the second input power supply is used as the power adapter with 5V.
However, in the prior art, as shown in a circuit diagram of a common use of a power supply multiplexer in fig. 2, when the second circuit input power supply is powered down, because the corresponding second circuit input power supply inputs voltage, the voltage is an analog signal, for different power supply control chips, different power supply control chips possibly set different power supply voltages on EN pins, namely different power supply control chips, possibly set up on EN pins to sense that the second circuit input power supply is 3V and can be powered up again, if the voltage is less than 3V, possibly set up on EN pins to sense that the second circuit input power supply is 3.5V and can be powered up again, and if the voltage is less than 3.5V, under the condition, because the voltage of the second circuit input power supply is an analog signal, the EN pins of the power supply control chip need to accurately regulate and control the first voltage dividing resistor R1 and the second voltage dividing resistor R2 according to the conditions of a load and an actual circuit, even if the same power supply control chip senses that the second circuit input power supply voltage is 3V, if the second circuit input power supply is set up again, the voltage is not required to be changed on the second voltage dividing resistor R1 or the second voltage dividing resistor is not to be set up, and the power supply voltage is not required to be changed on the actual circuit, and the power supply chip is not required to be changed on the second voltage dividing resistor 2, and the power supply is not required to be changed frequently.
In practical application, in the above-mentioned circumstances, if the second way input power supply loses power, the direct control of power control chip switches over to carrying out the power supply through first way input power supply, and at this moment, there are a lot of frequent power down and power on circumstances, can lead to the power control chip to frequently switch over input power supply, if operating personnel's operation is improper, leads to the frequent power down of second way input power supply and power on, perhaps because the life problem of second way input power supply, leads to the second way input power supply to appear becoming flexible, and then leads to the frequent power on of second way input power supply and power down.
Therefore, in this embodiment, a voltage detecting and comparing unit may be added between the second input power and the EN pin of the power control chip, where the voltage detecting and comparing unit may accurately detect the voltage of the second input power, compare the detected voltage with the 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 the comparison result. Therefore, no matter what type of power supply control chip is used, no power-on and power-off voltage is required to be set on an EN pin, the first voltage dividing resistor R1 and the second voltage dividing resistor R2 are not required to be adjusted, but the detected analog signal of the voltage of the second path of input power supply is compared with the preset reference voltage in the voltage detection and comparison unit, and the voltage detection and comparison unit can directly output a digital signal according to the comparison result, namely: when the voltage of the second path of input power supply is detected to be larger 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 path of input power supply as output to supply power; 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, and at the moment, the power supply control chip switches the input power supply and selects the first path of input power supply as output to supply power. Therefore, the embodiment can realize that the input voltage values are consistent when the output is turned over, that is, the output can be turned over under the condition of the same input voltage value, so that the stability of switching the input voltage is greatly improved when the system is controlled.
Of course, a voltage detection and comparison unit may be added between the first path of input power and the SEL pin of the power control chip, where the voltage detection and comparison unit may accurately detect the voltage of the first path of input power, compare the detected 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 practical application, for example, the plug is loose, then, the stable switching of the input power source can be realized according to the technical scheme of the embodiment, but when the input voltage is switched, the digital control signal with the EN pin is switched back and forth, the output caused by the back and forth rebound is switched back and forth between the two paths of input power sources to cause oscillation, and therefore, in the voltage detection and comparison unit, a hysteresis comparison window can be preset, namely: the voltage detection and comparison unit is preset with a hysteresis comparison window, when the second input voltage is compared with a preset reference voltage, under a certain second input voltage, after the second input voltage is turned to a low-level digital control signal according to a comparison result, if the output of the voltage detection and comparison unit is turned to a high-level digital control signal, the fluctuation voltage of the second input power supply is obtained, the hysteresis voltage is adjusted to be larger than the fluctuation voltage of the second input power supply, and a preset voltage value is increased on the basis of the second input voltage, so that the second input voltage is larger than the sum of the preset reference voltage and the fluctuation voltage of the second input power supply. That is, after the output of the voltage detecting and comparing unit turns low under a certain input voltage, the output needs to be turned high after a certain voltage value is added on the basis of the input voltage, so that the problem that the output is switched back and forth 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 the embodiment, the voltage detection and comparison unit can be arranged on the first path of input power supply to accurately detect the path of input voltage, and can also be arranged on the second path of input power supply to accurately detect the path of input power supply, and after the voltage detection unit detects the input voltage of the corresponding path of input power supply, the corresponding working principle is consistent.
In this embodiment, for example, the preset reference voltage is 2V, the fluctuating voltage of the second input power supply is 200mV, the hysteresis comparison window value of the hysteresis comparison window is 2.5V, the hysteresis voltage is 300mV, when the voltage detection and comparison unit detects that the second input voltage is less than 2V, the power is turned off, at this time, the power control chip controls the first input power supply to supply power and output, and when the second input power supply is powered on, the second input voltage needs to be raised to be above 2.2V, so that the second input voltage can be turned over from low to high.
In addition, according to the requirement, 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 the output between two paths of input power supplies due to back and forth rebound of the control signal during switching of the input voltage is avoided, and the switching stability of the system power supply 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 can also be used, and the voltage detection and comparison unit is utilized to realize 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 output, so as to realize switching of the input power supplies, ensure stable power supply of the chip power supply system, and avoid oscillation.
Example 2
The present embodiment provides a control method of a power supply multiplexer, and a flowchart of the control method is shown in fig. 5, where the method includes:
s1, supplying power to a power supply control chip through a first path of input power supply and a second path of input power supply respectively;
s2, connecting a first path of input voltage as control signal voltage to an SEL pin of the power supply control chip, and connecting a second path of input voltage 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 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;
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 a SEL pin or EN pin control signal of the power supply control chip according to the comparison result;
s5, 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 and the EN pin.
Similarly, in the present embodiment, in the case that the power supply control manner is consistent with that in embodiment 1, in which two paths of input power supplies are used to provide control signals to the SEL pin and the EN pin of the power supply control chip, in the normal power supply case, power may be initially supplied by the second path of input power supply, the voltage detection and comparison unit may detect the second path of input voltage of the second path of input power supply in real time and compare the second path of input voltage with the preset reference voltage, when the second path of 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 path of input power supply as output, and when the second path of input voltage of the second path of input power supply is smaller than the preset reference voltage, the voltage detection and comparison unit may send a high-level digital control signal to the EN pin of the power supply control chip, and at this time, the power supply control chip switches the input power supply to the second path of input power supply as output, so that consistency of all chips when switching power supply inputs can be realized.
In addition, referring to embodiment 1, in order to avoid the problem that the output is switched back and forth between two paths of input power sources to cause oscillation due to the back and forth bounce of the digital control signal of the EN pin 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 turned low under a certain input voltage, a certain voltage value is added on the basis of the input voltage to turn high, so that the problem that the output is switched back and forth between two paths of input power sources is avoided, and the stable switching of the system power sources is realized.
Therefore, the invention can control the two paths of input power supplies to switch under a specific voltage value, and can switch even if the voltage values of the two paths of input power supplies are identical, so that the chip can ensure consistency when the power supplies are switched, avoid oscillation caused by selecting the input power supplies, and ensure the reliability of power supply control of the system.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. 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 supply multiplexer, comprising:
the first path of input power supply is used for providing a first path of input voltage for a first power supply receiving end of the power supply control chip;
the second path of input power is used for providing a second path of input voltage for a second power receiving end of the power 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 when the first path of input voltage is used as the control signal voltage to be connected to an SEL pin of the power supply control chip and the second path of input voltage is used as the control signal voltage to be connected to an EN pin of the power supply control chip or 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 the EN pin and the SEL pin of the power supply control chip, 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 the SEL pin or the EN pin control signal of the power supply control chip according to a comparison result;
the power supply control chip is used for selecting a first path of input power supply or a 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 supply control chip as the control signal voltage, the second input voltage is connected to the EN pin of the power supply control chip as the control signal voltage, and the voltage detecting and comparing unit is provided 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 supply control chip according to the comparison result;
the SEL pin control signal of the power control chip, which outputs a low-level or high-level digital signal according to the comparison result, specifically refers to:
when the voltage of the first path of input power supply is detected to be larger 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 supply control chip according to the comparison result, and when the voltage of the first path of input power supply is detected to be smaller 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 supply 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 the SEL pin of the power supply control chip as the control signal voltage, the second input voltage is connected to the EN pin of the power supply control chip as the control signal voltage, and the voltage detecting and comparing unit is provided in the second input power supply, it is configured to detect the second input voltage, compare the detected second input voltage with a preset reference voltage, and output a low level or high level digital signal as the EN pin control signal of the power supply control chip according to the comparison result;
the digital signal of low level or high level is output as EN pin control signal of the power control chip according to the comparison result, specifically means:
when the voltage of the second path of input power supply is detected to be larger 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 supply control chip according to the comparison result, and when the voltage of the second path of input power supply is detected to be smaller 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 supply control chip according to the comparison result.
4. A 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 the output according to different control signal states of the SEL pin or the EN pin, specifically:
when the SEL pin of the power supply control chip receives a high-level digital control signal, a first path of input power supply is selected as output, and when the SEL pin of the power supply control chip receives a low-level digital control signal, a second path of input power supply is selected as output;
when the EN pin of the power supply control chip receives a high-level digital control signal, the second path of input power supply is selected as output, and when the EN pin of the power supply control chip receives a low-level digital control signal, the first path of input power supply is selected as output.
5. The power supply multiplexer according to claim 1, wherein when the first input voltage or the second input voltage is used as the control signal voltage and the first control signal voltage or the second control signal voltage is respectively connected to the EN pin and the SEL pin of the power supply control chip, the voltage detecting and comparing unit is arranged in the first input power supply and is used for detecting the first input voltage of the branch where the SEL pin is located, comparing the detected first input voltage with a preset reference voltage, and outputting a low level or high level digital signal as the SEL pin control signal of the power supply control chip according to the comparison result;
The SEL pin control signal of the power control chip, which outputs a low-level or high-level digital signal according to the comparison result, specifically refers to:
when the voltage of the first path of input power supply is detected to be larger 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 supply control chip according to the comparison result, and when the voltage of the first path of input power supply is detected to be smaller 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 supply control chip according to the comparison result.
6. The power supply multiplexer according to claim 5, wherein when the first input voltage or the second input voltage is used as the control signal voltage and the first control signal voltage or the second control signal voltage is respectively connected to the EN pin and the SEL pin of the power supply control chip, and the voltage detecting and comparing unit is disposed in the second input power supply, the voltage detecting and comparing unit is configured to detect the second input voltage of the branch where the EN pin is disposed, compare the detected second input voltage with a preset reference voltage, and output a low level or high level digital signal as the EN pin control signal of the power supply control chip according to the comparison result;
The digital signal of low level or high level is output as EN pin control signal of the power control chip according to the comparison result, specifically means:
when the voltage of the second path of input power supply is detected to be larger 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 supply control chip according to the comparison result, and when the voltage of the second path of input power supply is detected to be smaller 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 supply 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 the 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, the first path of input power supply is selected to be used as output when the SEL pin or the EN pin of the power supply control chip receives a high-level digital control signal, and the second path of input power supply is selected to be used as output when the SEL pin or the EN pin of the power supply control chip receives a low-level digital control signal;
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 to be used as output when the SEL pin or the EN pin of the power supply control chip receives a high-level digital control signal, and the first path of input power supply is selected to be used as output when the SEL pin or the EN pin of the power supply control chip receives a low-level digital control signal.
8. The power supply multiplexer according to claim 1, wherein the voltage detecting and comparing unit is provided with a hysteresis comparing window, when comparing the first input voltage or the second input voltage with a preset reference voltage, the voltage detecting and comparing unit is configured to flip the voltage detecting and comparing unit to a low-level digital control signal according to the comparison result when the input voltage of a certain input power supply is:
if the output of the voltage detection and comparison unit is turned to a high-level digital control signal, the fluctuation voltage of the corresponding input power supply is obtained, the hysteresis voltage is adjusted to be larger than the fluctuation voltage of the input power supply, and a preset voltage value is increased on the basis of the input voltage, so that the input voltage is larger than the sum of the preset reference voltage and the fluctuation voltage of the input power supply.
9. A control method of a power supply multiplexer, applied to the power supply multiplexer according to any one of claims 1 to 8, comprising:
The power supply control chip is powered by the first path of input power supply and the second path of input power supply respectively;
connecting the first path of input voltage as control signal voltage to an SEL pin of the power control chip, and connecting the second path of input voltage as control signal voltage to an EN pin of the power control chip; or, the first path of input voltage or the second path of input voltage is used as 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 supply 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 low-level or high-level digital signal as a SEL pin or an EN pin control signal of the power control chip according to the comparison result;
the power control chip selects a first path of input power or a second path of input power as output according to different control signal states of the SEL pin or the EN pin.
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