CN216699805U - Multi-path power supply switching circuit and electronic equipment - Google Patents
Multi-path power supply switching circuit and electronic equipment Download PDFInfo
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- CN216699805U CN216699805U CN202123159566.3U CN202123159566U CN216699805U CN 216699805 U CN216699805 U CN 216699805U CN 202123159566 U CN202123159566 U CN 202123159566U CN 216699805 U CN216699805 U CN 216699805U
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- 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
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Abstract
The utility model discloses a multi-path power supply switching circuit and electronic equipment, wherein the multi-path power supply switching circuit comprises: the power supply switching controller comprises a plurality of power supply input ends, a power supply output end, a plurality of power supply branches and a power supply switching controller; each power supply branch comprises a switch and a sampling circuit, the input ends of the switches are correspondingly connected with the input ends of the plurality of power supplies, and the output ends of the switches are connected with the output ends of the power supplies; each sampling circuit is used for sampling the power supply signal input by the power supply input end connected with each sampling circuit and outputting a sampling voltage; the input end of the power supply switching controller is respectively connected with the output ends of the plurality of sampling circuits, and the output ends of the power supply switching controller are respectively connected with the controlled ends of the plurality of switches; the multi-path sampling circuit is used for controlling the multi-path switches according to the sampling voltage of the multi-path sampling circuit, controlling the switch conduction of one path of power supply branch circuit according to the preset priority, and enabling the voltage of the power supply input end connected with the conducted power supply branch circuit to accord with the preset input voltage. The utility model improves the stability of the output power supply.
Description
Technical Field
The utility model relates to the technical field of power switching, in particular to a multi-path power switching circuit and electronic equipment.
Background
With the progress of science and technology, the requirements of various industries on power supply reliability are higher and higher, and in many occasions and equipment, a multi-path power supply backup is needed to ensure the power supply reliability.
At present, when most of multi-path power supply switching circuits are used, which power supply is switched to which power supply to supply power when detecting that which power supply has power, and the power supply with unstable power supply voltage (such as overvoltage or undervoltage) can be easily switched to due to the fact that the voltage of the power supply is not detected. And the equipment at the rear end is powered by the power supply, so that the situation of unstable work and even damage is easy to occur.
SUMMERY OF THE UTILITY MODEL
The utility model mainly aims to provide a multi-path power supply switching circuit and electronic equipment, and aims to solve the problem that when a multi-path power supply switching circuit switches power supplies, the power supply voltage is easy to be unstable.
In order to achieve the above object, the present invention provides a multi-channel power switching circuit, including:
a plurality of power input terminals and a power output terminal;
the power supply comprises a plurality of power supply branches, a plurality of sampling circuits and a plurality of control circuits, wherein each power supply branch comprises a switch and a sampling circuit, the input ends of the switches of the plurality of power supply branches are correspondingly connected with the input ends of a plurality of power supplies, and the output ends of the switches of the plurality of power supply branches are connected with the output ends of the power supplies;
each sampling circuit is used for sampling the power supply signal input by the power supply input end connected with the sampling circuit and outputting a sampling voltage;
the input end of the power supply switching controller is respectively connected with the output ends of the plurality of sampling circuits, and the output end of the power supply switching controller is respectively connected with the controlled ends of the plurality of switches;
and the power supply switching controller is used for carrying out switching control on the switches of the multiple power supply branches according to the sampling voltage of the multiple sampling circuits, controlling the switch conduction of one power supply branch according to a preset priority, and enabling the voltage of the power supply input end connected with the conducted power supply branch to accord with a preset input voltage.
Optionally, the sampling circuit of the multi-path power supply branch is divided into a first sampling circuit, a second sampling circuit and a third sampling circuit; the first sampling circuit comprises a first sampling resistor, a second sampling resistor and a third sampling resistor; the first end of the first sampling resistor is the input end of the first sampling circuit, the second end of the first sampling resistor is connected with the first end of the second sampling resistor, the second end of the second sampling resistor is connected with the first end of the third sampling resistor, and the second end of the third sampling resistor is grounded; the first end of the first sampling resistor, the first end of the second sampling resistor and the first end of the third sampling resistor are output ends of the first sampling circuit;
the second sampling circuit comprises a fourth sampling resistor, a fifth sampling resistor and a sixth sampling resistor; the first end of the fourth sampling resistor is the input end of the second sampling circuit, the second end of the fourth sampling resistor is connected with the first end of the fifth sampling resistor, the second end of the fifth sampling resistor is connected with the first end of the sixth sampling resistor, and the second end of the sixth sampling resistor is grounded; the first end of the fourth sampling resistor, the first end of the fifth sampling resistor and the first end of the sixth sampling resistor are output ends of the second sampling circuit;
the third sampling circuit comprises a seventh sampling resistor, an eighth sampling resistor and a ninth sampling resistor; the first end of the seventh sampling resistor is the input end of the third sampling circuit, the second end of the seventh sampling resistor is connected with the first end of the eighth sampling resistor, the second end of the eighth sampling resistor is connected with the first end of the ninth sampling resistor, and the second end of the ninth sampling resistor is grounded; the first end of the seventh sampling resistor, the first end of the eighth sampling resistor and the first end of the ninth sampling resistor are output ends of the second sampling circuit.
Optionally, the switches of the multi-path power supply branch are respectively a first switch circuit, a second switch circuit and a third switch circuit; the first switch circuit comprises a first MOS tube, a second MOS tube, a first resistor, a first diode and a fourth capacitor; the drain electrode of the first MOS tube is the input end of the first switch circuit, the source electrode of the first MOS tube is connected with the source electrode of the second MOS tube, the drain electrode of the second MOS tube is connected with the first end of the fourth capacitor, and the common end of the drain electrode of the second MOS tube, which is connected with the fourth capacitor, is the output end of the first switch circuit; a second end of the fourth capacitor is respectively connected with a grid electrode of the second MOS tube, a grid electrode of the first MOS tube, a first end of the first resistor and a cathode of the first diode, and a common end of the second end of the first resistor, which is connected with an anode of the first diode, and a common end of the source electrode of the first MOS tube, which is connected with a source electrode of the second MOS tube, are controlled ends of the first switch circuit;
the second switch circuit comprises a third MOS tube, a fourth MOS tube, a second resistor, a second diode and a fifth capacitor; the drain of the third MOS transistor is the input end of the second switch circuit, the source of the third MOS transistor is connected with the source of the fourth MOS transistor, the drain of the fourth MOS transistor is connected with the first end of the fifth capacitor, and the common end of the drain of the fourth MOS transistor, which is connected with the fifth capacitor, is the output end of the second switch circuit; a second end of the fifth capacitor is respectively connected with a gate of the fourth MOS transistor, a gate of the third MOS transistor, a first end of the second resistor and a cathode of the second diode, and a common end where the second end of the second resistor is connected with an anode of the second diode and a common end where a source of the third MOS transistor is connected with a source of the fourth MOS transistor are controlled ends of the second switch circuit;
the third switch circuit comprises a fifth MOS transistor, a sixth MOS transistor, a third resistor, a third diode and a sixth capacitor; the drain of the fifth MOS transistor is the input end of the third switch circuit, the source of the fifth MOS transistor is connected with the source of the sixth MOS transistor, the drain of the sixth MOS transistor is connected with the first end of the sixth capacitor, and the common end of the drain of the sixth MOS transistor, which is connected with the sixth capacitor, is the output end of the third switch circuit; the second end of the sixth capacitor is respectively connected with the grid electrode of the sixth MOS tube, the first end of the third resistor and the cathode of the third diode, and the common end of the second end of the third resistor, which is connected with the anode of the third diode, and the common end of the source electrode of the fifth MOS tube, which is connected with the source electrode of the sixth MOS tube, are controlled ends of the third switch circuit.
Optionally, the multi-path power switching circuit further includes a voltage conversion circuit, an input end of the voltage conversion circuit is connected to the power output end, and is configured to convert the power signal output by the power output end into a preset voltage signal and output the preset voltage signal.
Optionally, the voltage conversion circuit includes an adjustable switching circuit and a buck-boost chip; the sampling end of the buck-boost chip and the input end of the adjustable switch circuit are input ends of the voltage conversion circuit, and the output end of the buck-boost chip is connected with the controlled end of the adjustable switch circuit; the output end of the adjustable switching circuit is the output end of the voltage conversion circuit;
and the buck-boost chip is used for controlling the adjustable switch circuit according to the input voltage signal so as to output a preset voltage signal.
Optionally, the voltage conversion circuit further includes an input sampling circuit, an input end of the input sampling circuit is an input end of the voltage conversion circuit, an output end of the input sampling circuit is connected to an input end of the adjustable switch circuit, the buck-boost chip is connected to an input end and an output end of the input sampling circuit respectively,
the input sampling circuit is used for sampling the current of the input power supply signal and outputting an input sampling current signal;
the buck-boost chip is further used for controlling the adjustable switch circuit to be switched off when the input sampling current signal exceeds a preset input current.
Optionally, the voltage conversion circuit further includes an output sampling circuit, an input end of the output sampling circuit is connected to an output end of the adjustable switch circuit, and an output end of the output sampling circuit is an output end of the voltage conversion circuit;
the output sampling circuit is used for sampling the current of the preset voltage signal and sending an output sampling current signal;
the buck-boost chip is further used for controlling the adjustable switch circuit to be switched off when the output sampling current signal exceeds a preset output current.
Optionally, the voltage conversion circuit further includes a current limiting circuit, and the current limiting circuit is connected to the buck-boost chip;
the current limiting circuit is used for outputting a current limiting signal;
the buck-boost chip is further used for setting the preset output current according to the current limiting signal.
Optionally, the voltage conversion circuit further includes a feedback regulation circuit, an input end of the feedback regulation circuit is connected with the preset voltage signal, and an output end of the feedback regulation circuit is connected with the buck-boost chip;
the feedback adjusting circuit is used for outputting a feedback signal according to the preset voltage signal;
the buck-boost chip is further used for controlling the adjustable switch circuit according to the feedback signal so as to adjust the preset voltage signal.
In addition, in order to achieve the above object, the present invention further provides an electronic device including the multi-power switching circuit as described above.
The multi-channel power supply is automatically switched according to a certain priority order, and when a first power supply signal with the highest priority accords with a preset input voltage, a switch corresponding to the power supply signal is automatically switched on and is switched to be powered by the first power supply signal; when the first power signal does not accord with the preset input voltage, the power signal has overvoltage, undervoltage or even no input, at this time, if the second power signal with the second highest priority accords with the preset input voltage, the switch corresponding to the power signal is switched on to be powered by the power signal, if the second power signal does not accord with the preset input voltage, the switch is switched to the third power signal which accords with the preset input voltage, and so on. Therefore, automatic switching to a power supply with stable power supply in multiple power supplies for output is realized, and the system has the advantages of more flexible power supply mode, simple circuit and high reliability.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a functional block diagram of a multi-channel power switching circuit according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a portion of the circuit structure of the embodiment of FIG. 1;
FIG. 3 is a schematic diagram of a circuit structure of another part of the embodiment shown in FIG. 1;
FIG. 4 is a schematic diagram of a portion of functional blocks of another embodiment of the multi-channel power switching circuit of the present invention;
FIG. 5 is a schematic diagram of a portion of the circuit structure of the embodiment of FIG. 3;
fig. 6 is a schematic diagram of a circuit structure of another part of the embodiment shown in fig. 3.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
The reference numbers illustrate:
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the utility model and are not intended to limit the utility model.
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 only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.
In addition, the descriptions related to "first", "second", etc. in the present invention are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
Referring to fig. 1, in an embodiment, the multi-channel power switching circuit includes:
a plurality of power input terminals and a power output terminal;
the power supply system comprises a plurality of power supply branches 100, wherein each power supply branch 100 comprises a switch 200 and a sampling circuit 300, the input ends of the switches 200 of the power supply branches 100 are correspondingly connected with a plurality of power supply input ends, and the output ends of the switches 200 of the power supply branches 100 are connected with the power supply output ends;
each of the sampling circuits 300 is configured to sample a power signal input by the power input terminal connected to the sampling circuit, and output a sampled voltage;
the input end of the power supply switching controller 30 is respectively connected with the output ends of the plurality of sampling circuits, and the output end of the power supply switching controller is respectively connected with the controlled ends of the plurality of switches;
the power switching controller 30 is configured to perform on-off control on switches of the multiple power branches according to the sampling voltage of the multiple sampling circuits, and control the switch of one of the power branches to be turned on according to a preset priority, where a voltage at a power input end connected to the turned-on power branch meets a preset input voltage.
The preset input voltage may be a voltage within a preset range, and it can be understood that the preset input voltage is within the preset range, and the specific preset range may be set according to an actual circuit. For example, the preset input voltage is 9-36V, and correspondingly, if the preset input voltage is met, the voltage is within the voltage range, if the preset input voltage is greater than 36V, the voltage is overvoltage, and if the preset input voltage is lower than 9V, the voltage is undervoltage, and both the preset input voltage and the undervoltage are not met. The plurality of power input terminals are respectively used for inputting a plurality of power signals, such as a first power signal VCC1, a second power signal VCC2, a third power signal VCC3, and the like. The voltage values of the first power signal VCC1, the second power signal VCC2, the third power signal VCC3, and the like may be the same or different, and are not limited herein.
In this embodiment, the switching of the power signals has priority, and the first priority may be the first power signal VCC1, the second power signal VCC2, the third power signal VCC3, and so on.
Specifically, the number of power input terminals is 3 for example. The power switching controller 30 may first detect the first power signal VCC1, the second power signal VCC2, and the third power signal VCC3, respectively; when the three power signals all meet the preset input voltage, the switch 200 corresponding to the first power signal VCC1 is switched preferentially to be output by the first power signal VCC1, and power is supplied to the back-end equipment; if the power switching controller 30 detects that the first power signal VCC1 does not conform to the preset input voltage, it sequentially switches to the switch 200 corresponding to the second power signal VCC2, and the second power signal VCC2 supplies power; when the first power signal VCC1 and the second power signal VCC2 do not conform to the preset input voltage, the switch 200 corresponding to the third power signal VCC3 is switched to be powered by the third power signal VCC 3.
The power switching controller 30 may further detect whether the first power signal VCC1 conforms to a preset input voltage, and control the switch 200 corresponding to the first power signal VCC1 to output the first power signal VCC1 when the first power signal VCC1 conforms; detecting the second power signal VCC2 when the first power signal VCC1 does not meet a preset input voltage, and controlling the switch 200 corresponding to the second power signal VCC2 to output the second power signal VCC2 when the second power signal VCC2 meets the preset input voltage; detect when second power signal VCC2 does not accord with preset input voltage third power signal VCC3 when third power signal VCC3 accords with preset input voltage, the switch 200 that control third power signal VCC3 corresponds exports third power signal VCC 3.
According to the scheme, three power supplies can be automatically switched according to a certain priority sequence, and when a first power supply signal VCC1 with the highest priority conforms to a preset input voltage, the power supply is automatically switched to be supplied by a first power supply signal VCC 1; when the first power signal VCC1 does not meet the preset input voltage, the power signal is over-voltage, under-voltage, or even has no input, at this time, if the second power signal VCC2 with the highest priority level meets the preset input voltage, the power signal VCC2 is switched to supply power, and if the second power signal VCC2 does not meet the preset input voltage, the power signal VCC3 meeting the preset input voltage is switched to. Therefore, automatic switching to the power supply with stable power supply in the three power supplies for output is realized, and the system has more flexible power supply mode, simple circuit and high reliability.
Further, referring to fig. 2, the sampling circuits 300 of the multi-path power supply branch 100 are a first sampling circuit 10, a second sampling circuit 20 and a third sampling circuit 30, respectively; the first sampling circuit 10 comprises a first sampling resistor 101, a second sampling resistor 102 and a third sampling resistor 103; a first end of the first sampling resistor 101 is an input end of the first sampling circuit 10, a second end of the first sampling resistor is connected to a first end of the second sampling resistor 102, a second end of the second sampling resistor 102 is connected to a first end of the third sampling resistor 103, and a second end of the third sampling resistor 103 is grounded; a first end of the first sampling resistor 101, a first end of the second sampling resistor 102, and a first end of the third sampling resistor 103 are output ends of the first sampling circuit 10;
the second sampling circuit 11 comprises a fourth sampling resistor 111, a fifth sampling resistor 112 and a sixth sampling resistor 113; a first end of the fourth sampling resistor 111 is an input end of the second sampling circuit 11, a second end of the fourth sampling resistor 111 is connected to a first end of the fifth sampling resistor 112, a second end of the fifth sampling resistor 112 is connected to a first end of the sixth sampling resistor 113, and a second end of the sixth sampling resistor 113 is grounded; a first end of the fourth sampling resistor 111, a first end of the fifth sampling resistor 112, and a first end of the sixth sampling resistor 113 are output ends of the second sampling circuit 11;
the third sampling circuit 12 comprises a seventh sampling resistor 121, an eighth sampling resistor 122 and a ninth sampling resistor 123; a first end of the seventh sampling resistor 121 is an input end of the third sampling circuit 12, a second end of the seventh sampling resistor 121 is connected to a first end of the eighth sampling resistor 122, a second end of the eighth sampling resistor 122 is connected to a first end of the ninth sampling resistor 123, and a second end of the ninth sampling resistor 123 is grounded; wherein, the first end of the seventh sampling resistor 121, the first end of the eighth sampling resistor 122 and the first end of the ninth sampling resistor 123 are output ends of the second sampling circuit 12.
In this embodiment, the power switching controller 20 samples power switching chips, such as LTC4417 IUF. The chip supports a wide range of inputs, and thus the voltage values of the first power supply signal VCC1, the second power supply signal VCC2, and the third power supply signal VCC3 may be different.
It should be noted that the first sampling circuit 10 may further include a first capacitor C1, where one end of the first capacitor C1 is connected to the first end of the first sampling resistor 101, and the other end is grounded. The second sampling circuit 11 may further include a second capacitor C2, wherein one end of the second capacitor C2 is connected to the first end of the fourth sampling resistor 111, and the other end is grounded. The third sampling circuit 12 may further include a third capacitor C3, wherein one end of the third capacitor C3 is connected to the first end of the seventh sampling resistor 121, and the other end is grounded. The power signal input to the power switching controller 30 may be filtered by the first capacitor C1, the second capacitor C2, and the third capacitor C3.
The resistance values of the sampling resistors can be set according to actual needs, for example, the first sampling resistor 101 is 793K, the second sampling resistor 102 is 23.3K, and the third sampling resistor 103 is 23.3K; the structure of the sampling resistor can be set according to the actual situation, and the sampling resistor can be a single resistor or a plurality of resistors connected in series; for example, the first sampling resistor 101 may include a resistor R1 and a resistor R2, the second sampling resistor 102 may include a resistor R3 and a resistor R4, and the fourth sampling resistor 103 may include a resistor R5 and a resistor R6, and the resistance of each resistor may be set according to actual conditions. The resistance values and the structures of the second sampling circuit 11 and the third sampling circuit 12 may also be set with reference to the first sampling circuit 10.
Further, the switches 200 of the multi-path power branch 100 respectively include a first switch circuit 20, a second switch circuit 21 and a third switch circuit 22; the first switch circuit 20 comprises a first MOS tube Q1, a second MOS tube Q2, a first resistor R19, a first diode D1 and a fourth capacitor C4; the drain of the first MOS transistor Q1 is the input end of the first switch circuit 20, the source of the first MOS transistor Q1 is connected to the source of the second MOS transistor Q2, the drain of the second MOS transistor Q2 is connected to the first end of the fourth capacitor C4, and the common end of the drain of the second MOS transistor Q2 connected to the fourth capacitor C4 is the output end of the first switch circuit 20; a second end of the fourth capacitor C4 is respectively connected to the gate of the second MOS transistor Q2, the gate of the first MOS transistor Q1, the first end of the first resistor R19 and the cathode of the first diode D1, and the second end of the first resistor R19 and the anode of the first diode D1 are controlled ends of the first switch circuit 20; a common end of the second end of the first resistor, which is connected with the anode of the first diode, and a common end of the source electrode of the first MOS tube, which is connected with the source electrode of the second MOS tube, are controlled ends of the first switch circuit; respectively connected with a pin 17 and a pin 18 of the chip LTC4417 IUF.
The second switch circuit 21 comprises a third MOS transistor Q3, a fourth MOS transistor Q4, a second resistor R20, a second diode D2 and a fifth capacitor C5; the drain of the third MOS transistor Q3 is the input end of the second switch circuit 21, the source of the third MOS transistor Q3 is connected to the source of the fourth MOS transistor Q4, the drain of the fourth MOS transistor Q4 is connected to the first end of the fifth capacitor C5, and the common end of the drain of the fourth MOS transistor Q4 connected to the fifth capacitor C5 is the output end of the second switch circuit 22; a second end of the fifth capacitor C5 is respectively connected to the gate of the fourth MOS transistor Q4, the gate of the third MOS transistor Q3, the first end of the second resistor R20 and the cathode of the second diode D2, and a common end where the second end of the second resistor R20 is connected to the anode of the second diode D2 and a common end where the source of the third MOS transistor Q3 is connected to the source of the fourth MOS transistor Q4 are controlled ends of the second switch circuit 21; respectively connected with 15 pins and 16 pins of the chip LTC4417 IUF.
The third switch circuit 22 comprises a fifth MOS transistor Q5, a sixth MOS transistor Q6, a third resistor R21, a third diode D2 and a sixth capacitor C6; the drain of the fifth MOS transistor Q5 is the input end of the third switch circuit 22, the source of the fifth MOS transistor Q5 is connected to the source of the sixth MOS transistor Q6, the drain of the sixth MOS transistor Q6 is connected to the first end of the sixth capacitor C6, and the common end of the drain of the sixth MOS transistor Q6 connected to the sixth capacitor C6 is the output end of the third switch circuit 22; a second end of the sixth capacitor C6 is respectively connected to the gate of the sixth MOS transistor Q6, the gate of the sixth MOS transistor Q6, the first end of the third resistor R21 and the cathode of the third diode D3, and a common end where the second end of the third resistor R21 is connected to the anode of the third diode D3 and a common end where the source of the fifth MOS transistor Q5 is connected to the source of the sixth MOS transistor Q6 are controlled ends of the third switch circuit 22; respectively connected with pins 13 and 14 of a chip LTC4417 IUF.
It should be noted that, when the controlled ends of the three switch circuits are connected to the power switching chip, appropriate adjustment may be made, for example, filter capacitors may be added, and the MOS transistors may be replaced by equivalent circuits or independent electronic elements, which is not described herein again. Further, the type of the MOS transistor can be set according to actual needs.
Further, the multi-path power switching circuit further includes a voltage conversion circuit 40, wherein an input end of the voltage conversion circuit 40 is connected to the power output end, and is configured to convert a power signal output by the power output end into a preset voltage signal VO and output the preset voltage signal VO;
it can be understood that the voltage values of the first power signal VCC1, the second power signal VCC2, the third power signal VCC3, etc. may be different, but a stable power supply voltage may be needed if the device connected to the rear end of the power switching circuit is powered by the output voltage, so that the voltage converting circuit 40 is configured to convert the input voltage into the required preset voltage signal VO, and the specific value of the preset voltage signal VO may be set according to an actual circuit. For example, the first power signal VCC1 is 9V, the second power signal VCC2 is 10V, and the third power signal VCC3 is 20V, but the back-end device needs a 12V power supply, that is, the preset voltage signal VO is 12V, and the voltage conversion circuit 40 needs to detect the magnitude of the input voltage signal VOUT and convert the input voltage signal VOUT into 12V output.
Further, the voltage conversion circuit 40 includes a buck-boost chip 41 and an adjustable switch circuit 42; the sampling end of the buck-boost chip 41 and the input end of the adjustable switch circuit 42 are input ends of the voltage conversion circuit 40, and the output end of the buck-boost chip 41 is connected with the controlled end of the adjustable switch circuit 42; the output end of the adjustable switching circuit 42 is the output end of the voltage conversion circuit 40;
the buck-boost chip 42 is configured to control the adjustable switch circuit 42 according to the input voltage signal, so as to output a preset voltage signal VO.
In this embodiment, the buck-boost chip 42 has dual functions of boost and buck, and an input end thereof is connected to the power output end to receive the VOUT signal and detect a specific voltage value of the signal, so as to control the frequency of the switch in the adjustable switching circuit 42 to adjust the voltage value of the output voltage.
Further, the voltage conversion circuit 40 further includes an input sampling circuit 43, an input end of the input sampling circuit 43 is an input end of the voltage conversion circuit 40, an output end of the input sampling circuit 43 is connected with an input end of the adjustable switch circuit 42, the buck-boost chip 41 is respectively connected with an input end and an output end of the input sampling circuit 43,
the input sampling circuit 43 is configured to sample a current of an input power signal and output an input sampled current signal;
the buck-boost chip 41 is further configured to control the adjustable switch circuit 42 to be turned off when the input sampling current signal exceeds a preset input current.
The preset input current value can be set according to an actual circuit, and it can be understood that when the input current signal exceeds the preset input current, that is, when the current signal is overcurrent, the buck-boost chip 41 enters a protection state, and the voltage conversion circuit 40 stops outputting.
Further, the voltage conversion circuit 40 further includes an output sampling circuit 44, an input end of the output sampling circuit 44 is connected to an output end of the adjustable switch circuit 42, and an output end is an output end of the voltage conversion circuit 40;
the output sampling circuit 44 is configured to sample a current of the preset voltage signal and output a sampled current signal;
the buck-boost chip 41 is further configured to control the adjustable switching circuit to be turned off when the output sampling current signal exceeds a preset output current.
The preset output current value may be set according to an actual circuit, and may be the same as the preset input current value. It can be understood that, when the output current signal exceeds the preset output current, i.e. when the current signal is over-current, the buck-boost chip 41 also enters the protection state, and the voltage conversion circuit 40 stops outputting.
Further, the voltage conversion circuit 40 further includes a feedback regulation circuit 45, an input end of the feedback regulation circuit 45 is connected with an output end of the output sampling circuit, and an output end of the feedback regulation circuit 45 is connected with the buck-boost chip 41;
the feedback regulating circuit 45 is configured to output a feedback signal according to the preset voltage signal VO;
the buck-boost chip 41 is further configured to control the adjustable switching circuit 42 according to the feedback signal, so as to adjust the preset voltage signal VO.
Specifically, the feedback signal may be a voltage signal, and the buck-boost chip 41 may control the switching frequency of the adjustable switching circuit 42 according to the feedback signal, so as to adjust the value of the preset voltage signal VO until the preset value is met.
Further, the voltage conversion circuit 10 further includes a current limiting circuit 46 connected to the buck-boost chip 41, where the current limiting circuit 46 is configured to output a current limiting signal;
the buck-boost chip 41 is further configured to set the preset output current according to the current-limiting signal.
By adjusting the current limiting signal output by the current limiting circuit 46, the preset output circuit, i.e. the current limit of the output voltage signal, can be adjusted.
Based on the above structure, referring to fig. 5 to 6, the buck-boost chip 41 can adopt an SC8701QDER chip, and cooperate with an external circuit thereof to perform the power supply voltage stabilization and buck-boost control functions. Specifically, the sampling terminal of the buck-boost chip 41 may be a VIN pin of an SC8701QDER chip, and samples the input voltage VOUT. The adjustable switching circuit 42 may include a seventh MOS transistor Q7, an eighth MOS transistor Q8, a ninth MOS transistor Q9, a tenth MOS transistor Q10, and a first inductor L1, and is connected to pins 26, 27, and 28 of the SC8701QDER chip, and the adjustable switching circuit 42 may further include two sets of RC filter circuits, which are disposed at two ends of the first inductor L1 to remove spike voltages of the MOS transistors during switching. The input sampling circuit 43 may include a first precision resistor R22 and the output sampling circuit 44 may include a second precision resistor R23 that respectively sample the input current and the output current. The feedback adjusting circuit 45 may include a first voltage-dividing resistor R24 and a second voltage-dividing resistor R25, a first end of the first voltage-dividing resistor R24 is connected to a second end of the second precision resistor R23, and a second end of the first voltage-dividing resistor R24 and a common end of the second voltage-dividing resistor R24 and the second voltage-dividing resistor R25 are output ends of the feedback adjusting circuit 45 and connected to an FB pin of the SC8701QDER chip. The current limiting circuit 46 may include a first current limiting resistor R26 and a second current limiting resistor R27, each connected to the SC8701QDER chip. It should be noted that the structures of other peripheral circuits of the SC8701QDER chip need not be limited, and those skilled in the art can set the configuration by referring to the techniques commonly used in the art, and only the corresponding functions described above need to be implemented.
In summary, based on the hardware structure, the multi-path power switching circuit can support 9-36V wide-voltage input, support stable dc output within a range of 2.7-36V, integrate a voltage step-up and step-down function, adjust output voltage, specifically have functions of overvoltage protection, low-voltage protection, overcurrent protection, short-circuit protection and the like, and improve the safety of the circuit.
The present invention further provides an electronic device, which includes a multi-path power switching circuit, and the structure of the multi-path power switching circuit can refer to the foregoing embodiments, which are not described herein again. It should be understood that, since the electronic device of this embodiment adopts the technical solution of the multi-power switching circuit, the electronic device has all the advantages of the multi-power switching circuit.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A multi-channel power switching circuit, comprising:
a plurality of power input terminals and a power output terminal;
the power supply comprises a plurality of power supply branches, a plurality of sampling circuits and a plurality of control circuits, wherein each power supply branch comprises a switch and a sampling circuit, the input ends of the switches of the plurality of power supply branches are correspondingly connected with the input ends of a plurality of power supplies, and the output ends of the switches of the plurality of power supply branches are connected with the output ends of the power supplies;
each sampling circuit is used for sampling the power supply signal input by the power supply input end connected with the sampling circuit and outputting a sampling voltage;
the input end of the power supply switching controller is respectively connected with the output ends of the plurality of sampling circuits, and the output end of the power supply switching controller is respectively connected with the controlled ends of the plurality of switches;
and the power supply switching controller is used for carrying out switching control on the switches of the multiple power supply branches according to the sampling voltage of the multiple sampling circuits, controlling the switch conduction of one power supply branch according to a preset priority, and enabling the voltage of the power supply input end connected with the conducted power supply branch to accord with a preset input voltage.
2. The multi-power switching circuit of claim 1, wherein the sampling circuits of the multi-power branch are a first sampling circuit, a second sampling circuit and a third sampling circuit, respectively;
the first sampling circuit comprises a first sampling resistor, a second sampling resistor and a third sampling resistor; the first end of the first sampling resistor is the input end of the first sampling circuit, the second end of the first sampling resistor is connected with the first end of the second sampling resistor, the second end of the second sampling resistor is connected with the first end of the third sampling resistor, and the second end of the third sampling resistor is grounded; the first end of the first sampling resistor, the first end of the second sampling resistor and the first end of the third sampling resistor are output ends of the first sampling circuit;
the second sampling circuit comprises a fourth sampling resistor, a fifth sampling resistor and a sixth sampling resistor; the first end of the fourth sampling resistor is the input end of the second sampling circuit, the second end of the fourth sampling resistor is connected with the first end of the fifth sampling resistor, the second end of the fifth sampling resistor is connected with the first end of the sixth sampling resistor, and the second end of the sixth sampling resistor is grounded; the first end of the fourth sampling resistor, the first end of the fifth sampling resistor and the first end of the sixth sampling resistor are output ends of the second sampling circuit;
the third sampling circuit comprises a seventh sampling resistor, an eighth sampling resistor and a ninth sampling resistor; the first end of the seventh sampling resistor is the input end of the third sampling circuit, the second end of the seventh sampling resistor is connected with the first end of the eighth sampling resistor, the second end of the eighth sampling resistor is connected with the first end of the ninth sampling resistor, and the second end of the ninth sampling resistor is grounded; the first end of the seventh sampling resistor, the first end of the eighth sampling resistor and the first end of the ninth sampling resistor are output ends of the second sampling circuit.
3. The multi-power switching circuit of claim 1, wherein the switches of the multi-power branches are a first switch circuit, a second switch circuit and a third switch circuit, respectively;
the first switch circuit comprises a first MOS tube, a second MOS tube, a first resistor, a first diode and a fourth capacitor; the drain electrode of the first MOS tube is the input end of the first switch circuit, the source electrode of the first MOS tube is connected with the source electrode of the second MOS tube, the drain electrode of the second MOS tube is connected with the first end of the fourth capacitor, and the common end of the drain electrode of the second MOS tube, which is connected with the fourth capacitor, is the output end of the first switch circuit; a second end of the fourth capacitor is respectively connected with a grid electrode of the second MOS tube, a grid electrode of the first MOS tube, a first end of the first resistor and a cathode of the first diode, and a common end of the second end of the first resistor, which is connected with an anode of the first diode, and a common end of the source electrode of the first MOS tube, which is connected with a source electrode of the second MOS tube, are controlled ends of the first switch circuit;
the second switch circuit comprises a third MOS tube, a fourth MOS tube, a second resistor, a second diode and a fifth capacitor; the drain electrode of the third MOS tube is the input end of the second switch circuit, the source electrode of the third MOS tube is connected with the source electrode of the fourth MOS tube, the drain electrode of the fourth MOS tube is connected with the first end of the fifth capacitor, and the common end of the drain electrode of the fourth MOS tube, which is connected with the fifth capacitor, is the output end of the second switch circuit; a second end of the fifth capacitor is respectively connected with a gate of the fourth MOS transistor, a gate of the third MOS transistor, a first end of the second resistor and a cathode of the second diode, and a common end where the second end of the second resistor is connected with an anode of the second diode and a common end where a source of the third MOS transistor is connected with a source of the fourth MOS transistor are controlled ends of the second switch circuit;
the third switch circuit comprises a fifth MOS transistor, a sixth MOS transistor, a third resistor, a third diode and a sixth capacitor; the drain of the fifth MOS transistor is the input end of the third switch circuit, the source of the fifth MOS transistor is connected with the source of the sixth MOS transistor, the drain of the sixth MOS transistor is connected with the first end of the sixth capacitor, and the common end of the drain of the sixth MOS transistor, which is connected with the sixth capacitor, is the output end of the third switch circuit; the second end of the sixth capacitor is respectively connected with the grid electrode of the sixth MOS tube, the first end of the third resistor and the cathode of the third diode, and the common end of the second end of the third resistor, which is connected with the anode of the third diode, and the common end of the source electrode of the fifth MOS tube, which is connected with the source electrode of the sixth MOS tube, are controlled ends of the third switch circuit.
4. The multi-channel power switching circuit according to any one of claims 1-3, further comprising a voltage converting circuit, wherein an input terminal of the voltage converting circuit is connected to the power output terminal, and is configured to convert the power signal output from the power output terminal into a predetermined voltage signal and output the predetermined voltage signal.
5. The multi-power switching circuit of claim 4, wherein the voltage conversion circuit comprises an adjustable switching circuit and a buck-boost chip; the sampling end of the buck-boost chip and the input end of the adjustable switch circuit are input ends of the voltage conversion circuit, and the output end of the buck-boost chip is connected with the controlled end of the adjustable switch circuit; the output end of the adjustable switching circuit is the output end of the voltage conversion circuit;
and the buck-boost chip is used for controlling the adjustable switch circuit according to the input voltage signal so as to output a preset voltage signal.
6. The multi-power switching circuit of claim 5, wherein the voltage converting circuit further comprises an input sampling circuit, an input terminal of the input sampling circuit is an input terminal of the voltage converting circuit, an output terminal of the input sampling circuit is connected to an input terminal of the adjustable switching circuit, the buck-boost chip is connected to an input terminal and an output terminal of the input sampling circuit respectively,
the input sampling circuit is used for sampling the current of the input power supply signal and outputting an input sampling current signal;
the buck-boost chip is further used for controlling the adjustable switch circuit to be switched off when the input sampling current signal exceeds a preset input current.
7. The multi-power switching circuit of claim 5, wherein the voltage converting circuit further comprises an output sampling circuit, an input terminal of the output sampling circuit is connected to an output terminal of the adjustable switching circuit, and an output terminal of the output sampling circuit is an output terminal of the voltage converting circuit;
the output sampling circuit is used for sampling the current of the preset voltage signal and sending an output sampling current signal;
the buck-boost chip is further used for controlling the adjustable switch circuit to be switched off when the output sampling current signal exceeds a preset output current.
8. The multi-power switching circuit of claim 7, wherein the voltage conversion circuit further comprises a current limiting circuit, the current limiting circuit being connected to the buck-boost chip;
the current limiting circuit is used for outputting a current limiting signal;
the buck-boost chip is further used for setting the preset output current according to the current limiting signal.
9. The multi-power switching circuit of claim 5, wherein the voltage converting circuit further comprises a feedback regulating circuit, an input terminal of the feedback regulating circuit is connected to the preset voltage signal, and an output terminal of the feedback regulating circuit is connected to the buck-boost chip;
the feedback adjusting circuit is used for outputting a feedback signal according to the preset voltage signal;
the buck-boost chip is further used for controlling the adjustable switch circuit according to the feedback signal so as to adjust the preset voltage signal.
10. An electronic device, characterized in that it comprises a multi-way power switching circuit as claimed in any one of claims 1-9.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114911664A (en) * | 2022-07-18 | 2022-08-16 | 上海泰矽微电子有限公司 | Multi-power supply switching SOC test method and system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114911664A (en) * | 2022-07-18 | 2022-08-16 | 上海泰矽微电子有限公司 | Multi-power supply switching SOC test method and system |
| CN114911664B (en) * | 2022-07-18 | 2022-09-30 | 上海泰矽微电子有限公司 | Multi-path power supply switching SOC test method and system |
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