CN108683514A - A kind of power supply circuit and for electric installation - Google Patents
A kind of power supply circuit and for electric installation Download PDFInfo
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- CN108683514A CN108683514A CN201810426263.7A CN201810426263A CN108683514A CN 108683514 A CN108683514 A CN 108683514A CN 201810426263 A CN201810426263 A CN 201810426263A CN 108683514 A CN108683514 A CN 108683514A
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- H—ELECTRICITY
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Abstract
The invention discloses a kind of power supply circuit and for electric installation, the power supply circuit includes the first power supply module, the second power supply module and at least two by electric module, first power supply module and second power supply module are used to be powered by electric module to be described, described to be included by electric module：First control submodule, first block submodule, load submodule, second to block submodule, the second control submodule and third control submodule；First blocks submodule under the control of the first control submodule, second blocks submodule under the common control of the second control submodule and third control submodule, electric current is set to be only capable of being formed into a loop by electric module by one, the electric current generation crosstalk respectively between by electric module is prevented, to ensure the normal work of power supply circuit.
Description
Technical Field
The invention relates to the technical field of power supply switching, in particular to a power supply circuit and a power supply device.
Background
At present, in 48V Power supply of an ONU (Optical Network Unit) device in the field of a GPON/EPON (Gigabit-Capable Optical Network/ethernet Passive Optical Network) Optical communication access Network, two modes, namely 24V local Power supply and Power Over Ethernet (POE), are commonly used, and most devices only adopt one Power supply mode. Poe (power over ethernet) refers to a technology that can provide dc power for some IP-based terminals (such as IP phones, wlan access points AP, webcams, etc.) while transmitting data signals for such devices, without any modification to the existing ethernet cat.5 wiring infrastructure. The POE technology can ensure the safety of the existing structured wiring and ensure the normal operation of the existing network, thereby reducing the cost to the maximum extent. The integrated POE system comprises two parts, namely a Power Supply Equipment (PSE) and a power receiving Equipment (PD), wherein the PSE is a Device for supplying power to an Ethernet client Device and is also a manager of the whole POE Ethernet power supply process; the PD device is a PSE load that accepts power, i.e., a client device of the POE system.
In the prior art, when a plurality of power receiving devices based on the IP are subjected to centralized power supply by adopting local power supply and ethernet power supply, after the PSE is connected to a first power receiving device and identifies the device as an effective PD, the PSE is connected to a second power receiving device, but does not identify the second power receiving device as an effective PD, at this time, crosstalk may exist in the current between the first power receiving device and the second power receiving device, which causes an excessive current flowing through a control switch of the first power receiving device, triggers overcurrent protection, thereby causing power supply interruption, and failing to perform normal power supply for the power receiving device.
In summary, when a plurality of IP-based power receiving devices are collectively powered by local power supply and power over ethernet, how to improve crosstalk of current between the plurality of power receiving devices is a technical problem to be solved by those skilled in the art.
Disclosure of Invention
The invention provides a power supply circuit and a power supply device, which are used for solving the problem of current crosstalk among a plurality of power receiving equipment when the power is intensively supplied to the plurality of power receiving equipment based on IP by adopting local power supply and Ethernet power supply in the prior art.
An embodiment of the present invention provides a power supply circuit, including a first power supply module, a second power supply module, and at least two power receiving modules, where the first power supply module and the second power supply module are both configured to supply power to the power receiving modules, and each of the power receiving modules includes: the device comprises a first control submodule, a first blocking submodule, a load submodule, a second blocking submodule and a second control submodule; wherein,
the first control submodule is respectively connected with the first blocking submodule and the load submodule and is used for providing a control signal for the first blocking submodule in the power receiving module only when the first power supply module supplies power for the power receiving module;
the first blocking sub-module is respectively connected with the first power supply module, the first control sub-module, the load sub-module and the second blocking sub-module, and is only used for providing the voltage sent by the first power supply module to the load sub-module after receiving a control signal sent by the first control sub-module so as to form a loop through the first control sub-module;
the second control submodule is respectively connected with the second power supply module and the second blocking submodule and is used for providing a control signal for the second blocking submodule in the power receiving module only when the second power supply module supplies power for the power receiving module;
the second blocking sub-module is respectively connected with the second power supply module, the second control sub-module, the load sub-module and the first blocking sub-module, and is only used for providing the voltage sent by the second power supply module to the load sub-module after receiving a control signal sent by the second control sub-module so as to form a loop through the second blocking sub-module;
the third control sub-module is respectively connected with the first blocking sub-module, the first control sub-module and the second control sub-module, and is used for sending a signal to the second control sub-module to cut off the second blocking sub-module when the first power supply module supplies power.
In a possible implementation manner, in the above power supply circuit provided in an embodiment of the present invention, the first power supply module includes: the circuit comprises a first power supply, a first switch, a second switch and a first capacitor; wherein,
the anode of the first power supply is connected with one end of the first switch and one end of the first capacitor respectively, and the cathode of the first power supply is connected with one end of the second switch;
the other end of the first switch, the other end of the first capacitor and the other end of the second switch are all connected with the first control submodule.
In a possible implementation manner, in the power supply circuit provided in the embodiment of the present invention, the first control sub-module includes: the device comprises a PD chip, a second capacitor, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a first triode and a second diode; wherein,
the PD chip comprises a first switching tube, the control end of the first switching tube is connected with the PD chip, the input end of the first switching tube is connected with a first node, and the output end of the first switching tube is connected with the first power supply module;
one end of the second capacitor is connected with the first node, and the other end of the second capacitor is connected with the second node;
the first resistor is respectively connected with the second node and the third node, the second resistor is respectively connected with the first node and the third node, the third resistor is respectively connected with the second node, the fourth resistor and the first blocking submodule, the fourth resistor is connected with the output end of the first triode and the first blocking submodule, one end of the fifth resistor is connected with the three nodes, and the other end of the fifth resistor is connected with the control end of the first triode;
the input end of the first triode is connected with the first node;
and the input end of the second diode is connected with the fourth node, and the output end of the second diode is connected with the first node.
In a possible implementation manner, in the power supply circuit provided in the embodiment of the present invention, the first blocking submodule includes: the second switch tube and the first diode;
the control end of the second switch tube is connected with the first control submodule, the input end of the second switch tube is connected with the first power supply module, and the output end of the second switch tube is connected with the input end of the first diode;
and the output end of the first diode is connected with a fifth node.
In a possible implementation manner, in the power supply circuit provided in the embodiment of the present invention, the load sub-module includes: and one end of the sixth resistor is connected with the fourth node, and the other end of the sixth resistor is connected with the fifth node.
In a possible implementation manner, in the power supply circuit provided in the embodiment of the present invention, the second power supply module includes: a second power supply and a rectifier bridge; wherein the rectifier bridge comprises a third diode, a fourth diode, a fifth diode and a sixth diode;
the anode of the second power supply is connected with the output end of the fifth diode and the input end of the sixth diode respectively, and the cathode of the second power supply is connected with the input end of the third diode and the output end of the fourth diode respectively;
the output end of the third diode and the output end of the sixth diode are both connected with a sixth node; and the input end of the fourth diode and the input end of the fifth diode are both connected with a seventh node.
In a possible implementation manner, in the power supply circuit provided in the embodiment of the present invention, the second control sub-module includes: a third capacitor, a seventh resistor and a seventh diode; wherein,
one end of the third capacitor is connected with the sixth node, and the other end of the third capacitor is connected with the seventh node;
one end of the seventh resistor is connected with the sixth node, and the other end of the seventh resistor is respectively connected with the output end of the seventh diode and the second blocking submodule;
an input end of the seventh diode is connected to the seventh node.
In a possible implementation manner, in the power supply circuit provided in the embodiment of the present invention, the second blocking submodule includes: a third switching tube and an eighth diode; wherein,
the control end of the third switching tube is connected with the second control submodule, the input end of the third switching tube is connected with the fourth node, and the output end of the third switching tube is connected with the seventh node;
and the input end of the eighth diode is connected with the sixth node, and the output end of the eighth diode is connected with the fifth node.
In a possible implementation manner, in the power supply circuit provided in an embodiment of the present invention, the third control sub-module includes: the ninth resistor, the ninth diode and the second triode; the ninth diode is a light emitting diode, the second triode is a phototriode, and the ninth diode and the second triode form a photoelectric coupler;
and one end of the ninth resistor is connected with the fifth node, the other end of the ninth resistor is connected with the photoelectric coupler, and the photoelectric coupler is respectively connected with the fourth node and the second control submodule.
In a possible implementation manner, in the power supply circuit provided in the embodiment of the present invention, the circuit further includes a discharging module, where one end of the discharging module is connected to the input end of the first diode, and the other end of the discharging module is connected to the first control submodule, and is used to discharge a leakage current generated by the first diode.
In a possible implementation manner, in the power supply circuit provided in the embodiment of the present invention, the discharge module includes an eighth resistor, one end of the eighth resistor is connected to the input end of the first diode, and the other end of the eighth resistor is connected to the first control submodule.
Correspondingly, the embodiment of the invention also provides a power supply device, which comprises the power supply circuit provided by the embodiment of the invention.
The power supply circuit and the power supply apparatus provided in the embodiments of the present invention include a first power supply module, a second power supply module, and at least two power receiving modules, where the first power supply module and the second power supply module are both configured to supply power to the power receiving modules, and each power receiving module includes: the device comprises a first control submodule, a first blocking submodule, a load submodule, a second blocking submodule and a second control submodule; the first blocking sub-module is controlled by the first control sub-module, and the second blocking sub-module is controlled by the second control sub-module and the third control sub-module together, so that current can only pass through one power receiving module to form a loop, crosstalk generated by the current between the power receiving modules is prevented, and normal work of the power supply circuit is guaranteed.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
FIG. 1 is a schematic diagram of a power supply circuit in the prior art;
fig. 2 is a schematic structural diagram of a power supply circuit according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a specific structure of a power supply circuit according to an embodiment of the present invention;
fig. 4 is a second schematic structural diagram of a power supply circuit according to an embodiment of the present invention;
fig. 5 is a second specific structural diagram of a power supply circuit according to an embodiment of the present invention.
Detailed Description
In the prior art, as shown in fig. 1, when a plurality of IP-based powered devices are collectively powered by local power supply and ethernet power supply, when a first power source V1 is connected to a first powered device, that is, when the PSE is supplying power to the first powered device, K1 is turned on, and when the PSE identifies the first powered device as a valid PD, K2 is turned on, and a current forms a loop in the first powered device, where a specific current flows from an anode of the first power source, passes through B, E, D and an a node via the turned-on K1, and then flows back to a cathode of the first power source via the turned-on K2; when the first power source V1 is connected to the second powered device, K1 'is turned on, and K2' is not turned on before the second powered device is not identified as a valid PD, at this time, current flows out from the anode of the first power source, and flows to the K2 switch through the turned-on K1 'via the B', a ', D', G ', G, F, E and D nodes, and in addition, current can also flow to the K2 switch through the K1' via the B ', E', D ', G', G, F, E and D nodes, but at this time, the current flowing through the K2 switch is too large, so that overcurrent protection is triggered, and K2 is turned off, so that the first power source cannot supply power to the powered devices, that is, the current between the powered devices has a crosstalk phenomenon, and the power supply circuit cannot normally operate.
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is apparent that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The shapes and sizes of the various elements in the drawings are not to scale and are merely intended to illustrate the invention.
Specifically, as shown in fig. 2, the power supply circuit provided in the embodiment of the present invention includes a first power supply module 1, a second power supply module 2, and at least two power receiving modules, where the first power supply module 1 and the second power supply module 2 are both configured to supply power to the power receiving modules, and each power receiving module includes: a first control submodule 31, a first blocking submodule 32, a load submodule 33, a second blocking submodule 34 and a second control submodule 35; wherein,
the first control submodule 31 is respectively connected to the first blocking submodule 32 and the load submodule 33, and is configured to provide a control signal to the first blocking submodule 32 in the power receiving module only when the first power supply module 1 supplies power to the power receiving module;
the first blocking sub-module 32 is respectively connected to the first power supply module 1, the first control sub-module 31, the load sub-module 33 and the second blocking sub-module 34, and is only used for providing the voltage sent by the first power supply module 1 to the load sub-module 33 after receiving the control signal sent by the first control sub-module 31, so as to form a loop through the first control sub-module 31;
the second control submodule 35 is respectively connected to the second power supply module 2 and the second blocking submodule 34, and is configured to provide a control signal to the second blocking submodule 34 in the power receiving module only when the second power supply module 2 supplies power to the power receiving module;
the second blocking sub-module 34 is respectively connected to the second power supply module 2, the second control sub-module 35, the load sub-module 33 and the first blocking sub-module 32, and is only used for providing the voltage sent by the second power supply module 2 to the load sub-module 33 after receiving the control signal sent by the second control sub-module 35, so as to form a loop through the second blocking sub-module 34;
the third control submodule 37 is connected to the first blocking submodule 32, the first control submodule 31 and the second control submodule 35, respectively, and is configured to send a signal to the second control submodule 35 to disable the second blocking submodule 34 when the first power supply module 1 supplies power.
The power supply circuit provided in the embodiment of the present invention includes a first power supply module, a second power supply module, and at least two power receiving modules, where the first power supply module and the second power supply module are both configured to supply power to the power receiving modules, and each power receiving module includes: the device comprises a first control submodule, a first blocking submodule, a load submodule, a second blocking submodule and a second control submodule; the first blocking sub-module is controlled by the first control sub-module, and the second blocking sub-module is controlled by the second control sub-module and the third control sub-module together, so that current can only pass through one power receiving module to form a loop, crosstalk generated by the current between the power receiving modules is prevented, and normal work of the power supply circuit is guaranteed.
It should be noted that fig. 2 illustrates an example of power supply to two power receiving modules (a first power receiving module 3 and a second power receiving module 4), and may include a plurality of power receiving modules, where the power receiving modules are IP-based terminals and may be powered by ethernet or a local adapter, and a specific timing sequence and an application scenario of power supply to the two power receiving modules are selected according to an actual situation, and are not limited specifically herein.
Specifically, in a power supply circuit provided in an embodiment of the present invention, as shown in fig. 3, a first power supply module 1 includes: a first power supply V1, a first switch K1, a second switch K2 and a first capacitor C1; wherein,
the anode of the first power supply V1 is connected with one end of a first switch K1 and one end of a first capacitor C1 respectively, and the cathode of the first power supply V1 is connected with one end of a second switch K2;
the other end of the first switch K1, the other end of the first capacitor C1 and the other end of the second switch K2 are all connected to the first control submodule 31.
In a specific implementation, in the power supply circuit provided in the embodiment of the present invention, the first power source is an ethernet power supply, when the first power source is connected to a powered module, that is, when the PSE supplies power to the powered module, the first switch is turned on, and when the PSE identifies that the powered module is a valid PD, K2 is turned on, and a current forms a loop in the powered device.
Specifically, in a power supply circuit provided in an embodiment of the present invention, as shown in fig. 3, the first control sub-module 31 includes: the device comprises a PD chip, a second capacitor C2, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a first triode Q1 and a second diode D2; wherein,
the PD chip comprises a first switch tube M1, the control end of the first switch tube M1 is connected with the inside of the PD chip, the input end of the first switch tube M1 is connected with the first node A, and the output end of the first switch tube M1 is connected with the first power supply module 1;
one end of the second capacitor C2 is connected to the first node a, and the other end is connected to the second node B;
the first resistor R1 is respectively connected with a second node B and a third node C, the second resistor R2 is respectively connected with a first node A and a third node C, the third resistor R3 is respectively connected with the second node B, a fourth resistor R4 and the first blocking submodule 32, the fourth resistor R4 is connected with the output end of the first triode Q1 and the first blocking submodule 32, one end of the fifth resistor R5 is connected with the three node C, and the other end of the fifth resistor R5 is connected with the control end of the first triode Q1;
the input end of the first triode Q1 is connected with a first node A;
the input terminal of the second diode D2 is connected to the fourth node D, and the output terminal is connected to the first node a.
In specific implementation, in the power supply circuit provided in the embodiment of the present invention, after the PSE identifies the power receiving module as an effective PD device, the second capacitor is charged with a current limiting point of 135mA, and in order to avoid a decrease in capacitance capacity at low temperature, the capacitor is preferably a solid capacitor, when the second capacitor is not charged, the potential of the PG pin of the PD chip is pulled low, that is, the potential of the third node is a low potential, the first triode is turned off, the first control submodule does not send a control signal to the first blocking submodule, the first blocking submodule is in a blocking state, and no current passes through; after the second capacitor is charged, the current limiting point is increased to 760mA, the potential of a PG pin of the PD chip is pulled high, namely the potential of a third node is high potential, the first triode is conducted, the first control submodule sends a control signal to the first blocking submodule, the first blocking submodule is in a conducting state, and current can flow through the first blocking submodule.
It should be noted that the second capacitor provided by the present invention is an energy storage device, and any other device capable of realizing an energy storage function may be substituted for the second capacitor, which is within the protection scope of the present invention, and is specifically selected according to the actual use condition, and is not specifically limited herein.
Specifically, in a power supply circuit provided in an embodiment of the present invention, as shown in fig. 3, the first blocking submodule 32 includes: a second switching tube M2 and a first diode D1;
the control end of the second switch tube M2 is connected with the first control submodule 31, the input end is connected with the first power supply module 1, and the output end is connected with the input end of the first diode D1;
the output terminal of the first diode D1 is connected to the fifth node E.
In a specific implementation, in the power supply circuit provided in the embodiment of the present invention, when the first control submodule sends a control signal to the second switching tube, that is, when the first triode provides a high potential to the second switching tube, the second switching tube is turned on, and a current passes through the second switching tube and the first diode, so that a potential of the fifth node is at the high potential.
Specifically, in a power supply circuit provided in an embodiment of the present invention, as shown in fig. 3, the load submodule 33 includes: and a sixth resistor R6, wherein one end of the sixth resistor R6 is connected to the fourth node D, and the other end is connected to the fifth node E.
Specifically, in a power supply circuit provided in an embodiment of the present invention, as shown in fig. 3, the second power supply module 2 includes: a second power supply V2 and a rectifier bridge; wherein the rectifier bridge comprises a third diode D3, a fourth diode D4, a fifth diode D5 and a sixth diode D6;
the anode of the second power supply V2 is connected to the output terminal of the fifth diode D5 and the input terminal of the sixth diode D6, respectively, and the cathode of the second power supply V2 is connected to the input terminal of the third diode D3 and the output terminal of the fourth diode D4, respectively;
an output terminal of the third diode D3 and an output terminal of the sixth diode D6 are both connected to the sixth node F; an input terminal of the fourth diode D4 and an input terminal of the fifth diode D5 are both connected to the seventh node G.
In a specific implementation, in the power supply circuit provided in the embodiment of the present invention, the second power supply is a local power supply, and the rectifier bridge rectifies current to provide direct current to the second control sub-module.
Specifically, in a power supply circuit provided in an embodiment of the present invention, as shown in fig. 3, the second control submodule 35 includes: a third capacitor C3, a seventh resistor R7, and a seventh diode D7; wherein,
one end of the third capacitor C3 is connected to the sixth node F, and the other end is connected to the seventh node G;
one end of the seventh resistor R7 is connected to the sixth node F, and the other end is connected to the output end of the seventh diode D7 and the second blocking sub-module 34 respectively;
an input terminal of the seventh diode D7 is connected to the seventh node G.
In a specific implementation, in the power supply circuit provided in the embodiment of the present invention, when a first power supply supplies power to the power receiving sub-module, the second control sub-module sends a control signal to the second blocking sub-module, but a signal sent by the third control sub-module to the second control sub-module pulls down the control signal sent by the second control sub-module to the second blocking sub-module. Therefore, the second blocking sub-module is in a blocking state, when the first power supply does not supply power to the power receiving sub-module, the third capacitor is charged by the second power supply, a high-potential signal is supplied to the second blocking sub-module, and the second blocking sub-module is conducted.
Specifically, in a power supply circuit provided in an embodiment of the present invention, as shown in fig. 3, the second blocking sub-module 34 includes: a third switching tube M3 and an eighth diode D8; wherein,
the control end of the third switching tube M3 is connected to the second control submodule 35, the input end is connected to the fourth node D, and the output end is connected to the seventh node G;
the input terminal of the eighth diode D8 is connected to the sixth node F, and the output terminal is connected to the fifth node E.
In specific implementation, in the power supply circuit provided in the embodiment of the present invention, when the second control submodule sends a control signal to the second blocking submodule, so that the control terminal of the third switching tube is at a high potential, the third switching tube is turned on, and a current flows back to the negative electrode of the second power supply through the eighth diode, the sixth resistor, and the third switching tube, so as to form a loop.
In the power supply circuit, when the first power supply supplies power, the potential of the control terminal of the third switch is pulled low, the second power supply path is disconnected, and when the first power supply does not supply power to the power receiving module, the potential of the control terminal of the third switch tube is pulled high, and the second power supply supplies power to the power receiving module.
Specifically, in a power supply circuit provided in an embodiment of the present invention, as shown in fig. 3, the third control sub-module includes: a ninth resistor R9, a ninth diode D9 and a second triode Q2; the ninth diode D9 is a light emitting diode, the second triode Q2 is a phototriode, and the ninth diode D9 and the second triode Q2 form a photoelectric coupler;
one end of the ninth resistor R9 is connected to the fifth node E, and the other end is connected to a photoelectric coupler, which is connected to the fourth node D and the second control submodule 35, respectively.
When the first power supply supplies power to the power receiving sub-module, the current passes through the ninth diode, the ninth diode emits light to enable the second triode to be conducted, signals are sent to the second control sub-module, the second control sub-module sends control signals to the second blocking module to be pulled down, and therefore the second blocking sub-module is in a blocking state, and the fact that the second power supply does not supply power to the power receiving sub-module when the first power supply supplies power to the power receiving sub-module is achieved.
Specifically, in the power supply circuit according to the embodiment of the present invention, as shown in fig. 4 and fig. 5, the circuit further includes a discharging module 36, where one end of the discharging module 36 is connected to the input terminal of the first diode D1, and the other end is connected to the first control submodule 31, and is used for discharging the leakage current generated by the first diode D1.
Specifically, in the power supply circuit according to the embodiment of the present invention, as shown in fig. 5, the discharging module 36 includes an eighth resistor R8, one end of the eighth resistor R8 is connected to the input terminal of the first diode D1, and the other end is connected to the first control submodule 31.
It should be noted that the switching tubes may be MOS transistors, or any other switching transistors capable of achieving the same function, and input ends and output ends of all the switching tubes may be interchanged, all the switching tubes are illustrated as N-type switching tubes, and when the above principle is satisfied, all the switching tubes may also be P-type switching tubes, which are set according to specific situations, and are not limited specifically herein.
It should be noted that the above embodiments are described by taking the first power receiving module 3 as an example, and the structure and connection relationship of the second power receiving module 4 are the same as those of the first power receiving module, which is not described herein again.
Based on the same inventive concept, the embodiment of the invention also provides a power supply device, which comprises the power supply circuit provided by the embodiment of the invention. The display device may be: the local power supply and the Ethernet power supply power IP telephones, wireless local area network Access Points (AP), network cameras and the like. Other essential components of the power supply device are understood by those skilled in the art, and are not described herein or should not be construed as limiting the present invention. The implementation of the power supply device can be referred to the above embodiment of the power supply circuit, and repeated descriptions are omitted.
The power supply circuit and the power supply apparatus provided in the embodiments of the present invention include a first power supply module, a second power supply module, and at least two power receiving modules, where the first power supply module and the second power supply module are both used to supply power to the power receiving modules, and each power receiving module includes: the device comprises a first control submodule, a first blocking submodule, a load submodule, a second blocking submodule and a second control submodule; the first blocking sub-module is controlled by the first control sub-module, and the second blocking sub-module is controlled by the second control sub-module and the third control sub-module together, so that current can only pass through one power receiving module to form a loop, crosstalk generated by the current between the power receiving modules is prevented, and normal work of the power supply circuit is guaranteed.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (12)
1. A power supply circuit, includes first power module, second power module and two at least powered modules, first power module with the second power module all is used for doing powered module supplies power, its characterized in that, powered module includes: the circuit comprises a first control submodule, a first blocking submodule, a load submodule, a second blocking submodule, a second control submodule and a third control submodule; wherein,
the first control submodule is respectively connected with the first blocking submodule and the load submodule and is used for providing a control signal for the first blocking submodule in the power receiving module only when the first power supply module supplies power for the power receiving module;
the first blocking sub-module is respectively connected with the first power supply module, the first control sub-module, the load sub-module and the second blocking sub-module, and is only used for providing the voltage sent by the first power supply module to the load sub-module after receiving a control signal sent by the first control sub-module so as to form a loop through the first control sub-module;
the second control submodule is respectively connected with the second power supply module and the second blocking submodule and is used for providing a control signal for the second blocking submodule in the power receiving module only when the second power supply module supplies power for the power receiving module;
the second blocking sub-module is respectively connected with the second power supply module, the second control sub-module, the load sub-module and the first blocking sub-module, and is only used for providing the voltage sent by the second power supply module to the load sub-module after receiving a control signal sent by the second control sub-module so as to form a loop through the second blocking sub-module;
the third control sub-module is respectively connected with the first blocking sub-module, the first control sub-module and the second control sub-module, and is used for sending a signal to the second control sub-module to cut off the second blocking sub-module when the first power supply module supplies power.
2. The power supply circuit of claim 1, wherein the first power supply module comprises: the circuit comprises a first power supply, a first switch, a second switch and a first capacitor; wherein,
the anode of the first power supply is connected with one end of the first switch and one end of the first capacitor respectively, and the cathode of the first power supply is connected with one end of the second switch;
the other end of the first switch, the other end of the first capacitor and the other end of the second switch are all connected with the first control submodule.
3. The power supply circuit of claim 1 wherein said first control submodule comprises: the device comprises a PD chip, a second capacitor, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a first triode and a second diode; wherein,
the PD chip comprises a first switching tube, the control end of the first switching tube is connected with the PD chip, the input end of the first switching tube is connected with a first node, and the output end of the first switching tube is connected with the first power supply module;
one end of the second capacitor is connected with the first node, and the other end of the second capacitor is connected with the second node;
the first resistor is respectively connected with the second node and the third node, the second resistor is respectively connected with the first node and the third node, the third resistor is respectively connected with the second node, the fourth resistor and the first blocking submodule, the fourth resistor is connected with the output end of the first triode and the first blocking submodule, one end of the fifth resistor is connected with the three nodes, and the other end of the fifth resistor is connected with the control end of the first triode;
the input end of the first triode is connected with the first node;
and the input end of the second diode is connected with the fourth node, and the output end of the second diode is connected with the first node.
4. The power supply circuit of claim 1, wherein the first blocking submodule comprises: the second switch tube and the first diode;
the control end of the second switch tube is connected with the first control submodule, the input end of the second switch tube is connected with the first power supply module, and the output end of the second switch tube is connected with the input end of the first diode;
and the output end of the first diode is connected with a fifth node.
5. The power supply circuit of claim 1 wherein said load sub-module comprises: and one end of the sixth resistor is connected with the fourth node, and the other end of the sixth resistor is connected with the fifth node.
6. The power supply circuit of claim 1, wherein the second power supply module comprises: a second power supply and a rectifier bridge; wherein the rectifier bridge comprises a third diode, a fourth diode, a fifth diode and a sixth diode;
the anode of the second power supply is connected with the output end of the fifth diode and the input end of the sixth diode respectively, and the cathode of the second power supply is connected with the input end of the third diode and the output end of the fourth diode respectively;
the output end of the third diode and the output end of the sixth diode are both connected with a sixth node; and the input end of the fourth diode and the input end of the fifth diode are both connected with a seventh node.
7. The power supply circuit of claim 1 wherein said second control submodule comprises: a third capacitor, a seventh resistor and a seventh diode; wherein,
one end of the third capacitor is connected with the sixth node, and the other end of the third capacitor is connected with the seventh node;
one end of the seventh resistor is connected with the sixth node, and the other end of the seventh resistor is respectively connected with the output end of the seventh diode and the second blocking submodule;
an input end of the seventh diode is connected to the seventh node.
8. The power supply circuit of claim 1, wherein the second blocking submodule comprises: a third switching tube and an eighth diode; wherein,
the control end of the third switching tube is connected with the second control submodule, the input end of the third switching tube is connected with the fourth node, and the output end of the third switching tube is connected with the seventh node;
and the input end of the eighth diode is connected with the seventh node, and the output end of the eighth diode is connected with the fifth node.
9. The power supply circuit of claim 1 wherein said third control sub-module comprises: the ninth resistor, the ninth diode and the second triode; the ninth diode is a light emitting diode, the second triode is a phototriode, and the ninth diode and the second triode form a photoelectric coupler;
and one end of the ninth resistor is connected with the fifth node, the other end of the ninth resistor is connected with the photoelectric coupler, and the photoelectric coupler is respectively connected with the fourth node and the second control submodule.
10. The power supply circuit of claim 4 further comprising a discharge module having one end coupled to the input terminal of the first diode and another end coupled to the first control submodule for discharging leakage current generated by the first diode.
11. The power supply circuit of claim 10 wherein said discharge module includes an eighth resistor, one end of said eighth resistor being connected to said input terminal of said first diode and the other end of said eighth resistor being connected to said first control submodule.
12. A power supply arrangement, characterized in that it comprises a power supply circuit according to any one of claims 1-11.
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| CN113438091A (en) * | 2021-05-28 | 2021-09-24 | 浙江大华技术股份有限公司 | Power supply switching circuit |
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