CN216599118U - Flyback power supply parallel switching circuit and device - Google Patents
Flyback power supply parallel switching circuit and device Download PDFInfo
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- CN216599118U CN216599118U CN202123177954.4U CN202123177954U CN216599118U CN 216599118 U CN216599118 U CN 216599118U CN 202123177954 U CN202123177954 U CN 202123177954U CN 216599118 U CN216599118 U CN 216599118U
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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
The utility model discloses a flyback power supply parallel switching circuit and a flyback power supply parallel switching device. The flyback power supply parallel switching circuit comprises: the utility model comprises a power module and a controllable switch module, wherein the power module comprises a main power supply and at least one auxiliary power supply, and the controllable switch module is used for conducting a first built-in controllable switch unit when the main power supply is powered on so as to enable the main power supply to supply power to a load, and then conducting a second built-in controllable switch unit when the main power supply is powered off and the auxiliary power supply is powered on so as to enable the auxiliary power supply to supply power to the load. According to the utility model, when the main power supply is powered on and the auxiliary power supply is powered on or not, the load is supplied by the main power supply, and when the main power supply is powered off and the auxiliary power supply is powered on, the load is supplied by the auxiliary power supply.
Description
Technical Field
The utility model relates to the technical field of power electronics, in particular to a flyback power supply parallel switching circuit and device.
Background
A system power supply in the frequency converter usually adopts a multi-path output flyback power supply, and a rectified direct current bus is used as a power supply to realize multi-path voltage output; and need control module and drive module independent power supply control under some application scenarios, on the basis of above-mentioned system power, increase independent control module power, control the electricity and provide after being parallelly connected by main power and auxiliary control power, but two flyback power supply are directly parallelly connected and are gone up the electricity, although design specification is the same, receive device difference and other way load changes influence, the output of every power can fluctuate along with different environment and operating mode, one of them power often can receive the influence of another way power, wherein the parallel design of main feedback output often leads to the feedback maladjustment, lead to other output voltage not up to standard condition, the power that even appears the feedback maladjustment can't start, do not have the circumstances such as output and power hiccup. Therefore, in the prior art, the two flyback power supplies are directly connected in parallel and then powered on, so that the output voltage does not reach the standard, and the flyback power supplies work abnormally.
The above is only for the purpose of assisting understanding of the technical solution of the present invention, and does not represent an admission that the above is the prior art.
SUMMERY OF THE UTILITY MODEL
The utility model mainly aims to provide a flyback power supply parallel switching circuit and a flyback power supply parallel switching device, and aims to solve the technical problems that automatic switching of a main power supply and an auxiliary power supply cannot be effectively realized in the prior art, and the flyback power supply works abnormally when two power supplies are output in parallel.
In order to achieve the above object, the present invention provides a flyback power supply parallel switching circuit, including: the power supply module comprises a main power supply and at least one auxiliary power supply, and a controllable switch module;
the power supply module is connected with the input end of the controllable switch module, and the output end of the controllable switch module is connected with a load;
the controllable switch module is used for conducting a first built-in controllable switch unit when the main power supply is powered on so as to enable the main power supply to supply power to the load;
the controllable switch module is further configured to switch on a built-in second controllable switch unit when the main power supply is powered off and the auxiliary power supply is powered on, so that the auxiliary power supply supplies power to the load.
Optionally, the flyback power supply parallel switching circuit further includes: a switch control module;
the input end of the switch control module is respectively connected with the main power supply and the auxiliary power supply, the first output end of the switch control module is connected with the enabling end of the second controllable switch unit, and the second output end of the switch control module is grounded;
the switch control module is used for transmitting a low level signal to an enabling end of the second controllable switch unit when the main power supply is powered on;
the second controllable switch unit is used for being switched off when the enabling end receives the low-level signal.
Optionally, the first controllable switch unit comprises: the transistor comprises a first MOS transistor, a second MOS transistor, a first resistor, a second resistor, a first triode and a third resistor;
the drain electrode of first MOS pipe with the main power supply is connected, the source electrode of first MOS pipe respectively with the source electrode of second MOS pipe with the first end of first resistance is connected, the grid of first MOS pipe respectively with the second end of first resistance the grid of second MOS pipe and the first end of second resistance is connected, the drain electrode of second MOS pipe with the load is connected, the second end of second resistance with the collecting electrode of first triode is connected, the projecting pole ground connection of first triode, the first end of third resistance respectively with the main power supply with the input of on-off control module is connected, the second end of third resistance with the base of first triode is connected.
Optionally, the second controllable switch unit comprises: the third MOS tube, the fourth resistor, the fifth resistor, the second triode and the sixth resistor;
the drain electrode of third MOS pipe with auxiliary power connects, the source electrode of third MOS pipe respectively with the source electrode of fourth MOS pipe with the first end of fourth resistance is connected, the grid electrode of third MOS pipe respectively with the second end of fourth resistance the grid electrode of fourth MOS pipe and the first end of fifth resistance is connected, the drain electrode of fourth MOS pipe with the load is connected, the second end of fifth resistance with the collecting electrode of second triode is connected, the projecting pole ground connection of second triode, the first end of sixth resistance respectively with auxiliary power with the first output of on-off control module is connected, the second end of sixth resistance with the base of second triode is connected.
Optionally, the switch control module comprises: a third triode;
the base electrode of the third triode is respectively connected with the main power supply and the enabling end of the first controllable switch unit, the collector electrode of the third triode is respectively connected with the auxiliary power supply and the enabling end of the second controllable switch unit, and the emitting electrode of the third triode is grounded.
Optionally, the switch control module further comprises: a seventh resistor and an eighth resistor;
the first end of the seventh resistor is connected with the main power supply and the input end of the first controllable switch unit respectively, the second end of the seventh resistor is connected with the enabling end of the first controllable switch unit and the base electrode of the third triode respectively, the first end of the eighth resistor is connected with the auxiliary power supply and the input end of the second controllable switch unit respectively, and the second end of the eighth resistor is connected with the enabling end of the second controllable switch unit and the collector electrode of the third triode respectively.
Optionally, the main power supply comprises: the rectifier unit and the main transformer unit;
the input end of the rectification unit is connected with three-phase alternating current, the output end of the rectification unit is connected with the input end of a main voltage transformation unit, and the output end of the main voltage transformation unit is respectively connected with the input end of the switch control module and the input end of the first controllable switch unit;
the rectifying unit is used for rectifying the three-phase alternating current to obtain direct current and transmitting the direct current to the main voltage transformation unit;
the main voltage transformation unit is used for transforming the direct current to obtain a main voltage signal and transmitting the main voltage signal to the input end of the first controllable switch unit;
the first main control switch unit is further configured to supply power to the load according to the main voltage signal when the current state is in a conducting state.
Optionally, the main voltage unit is further configured to transmit the main voltage signal to an input end of the switch control module;
the switch control module is further configured to enter a conducting state when receiving the main voltage signal, so that the enable end of the second controllable switch unit receives a low level signal.
Optionally, the auxiliary power supply comprises: an auxiliary voltage transformation unit;
the input end of the auxiliary voltage transformation unit is connected with an external direct-current power supply, and the output end of the auxiliary voltage transformation unit is connected with the input end of the second controllable switch unit;
the auxiliary voltage unit is used for transforming the direct current provided by the external direct current power supply to obtain an auxiliary voltage signal and transmitting the auxiliary voltage signal to the input end of the second controllable switch unit;
and the second controllable switch unit is also used for supplying power to the load according to the auxiliary voltage signal when the current state is in a conducting state.
In order to achieve the above object, the present invention further provides a flyback power supply parallel switching device, which includes the flyback power supply parallel switching circuit as described above.
In the utility model, the flyback power supply parallel switching circuit comprises: the utility model comprises a power module and a controllable switch module, wherein the power module comprises a main power supply and at least one auxiliary power supply, and the controllable switch module is used for conducting a first built-in controllable switch unit when the main power supply is powered on so as to enable the main power supply to supply power to a load, and then conducting a second built-in controllable switch unit when the main power supply is powered off and the auxiliary power supply is powered on so as to enable the auxiliary power supply to supply power to the load. According to the utility model, when the main power supply is powered on and the auxiliary power supply is powered on or not, the load is supplied by the main power supply, and when the main power supply is powered off and the auxiliary power supply is powered on, the load is supplied by the auxiliary power supply.
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 flyback power supply parallel switching circuit according to a first embodiment of the present invention;
fig. 2 is a functional block diagram of a flyback power supply parallel switching circuit according to a second embodiment of the present invention;
fig. 3 is a schematic circuit structure diagram of a flyback power supply parallel switching circuit according to the present invention;
fig. 4 is a functional block diagram of a flyback power supply parallel switching circuit according to a second embodiment of the present invention.
The reference numbers illustrate:
| reference numerals | Name (R) | Reference numerals | Name (R) |
| 10 | |
1011 | Rectifying |
| 20 | |
1012 | Main |
| 101 | |
1021 | Auxiliary |
| 102 | Auxiliary power supply | R1～R8 | First to |
| 201 | First controllable switch unit | Q1～Q3 | First to |
| 202 | Second controllable switch unit | M1～M4 | First to |
| 30 | Switch control module |
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
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.
The utility model provides a flyback power supply parallel switching circuit.
Referring to fig. 1, fig. 1 is a functional block diagram of a flyback power supply parallel switching circuit according to a first embodiment of the present invention.
As shown in fig. 1, in the embodiment of the present invention, the flyback power supply parallel switching circuit includes: a power supply module 10 comprising a main power supply 101 and at least one auxiliary power supply 102, and a controllable switch module 20;
the power module 10 is connected with the input end of the controllable switch module 20, and the output end of the controllable switch module 20 is connected with a load;
the controllable switch module 20 is configured to, when the main power source 101 is powered on, turn on a first controllable switch unit 201 that is built in, so that the main power source 101 supplies power to the load;
it is understood that the controllable switch module 20 has the first controllable switch unit 201 and the second controllable switch unit 202 built therein, and the controllable switch module 20 can determine whether the first controllable switch unit 201 and the second controllable switch unit 202 built therein are turned on according to the power-on condition of the main power source 101 and the power-on condition of the auxiliary power source 102.
In a specific implementation, when the main power source 101 is powered on and the auxiliary power source 102 is powered on or powered off, the first controllable switch unit 201 is in an on state and the second controllable switch unit 202 is in an off state, so that a load can be supplied with power through the main power source 101.
The controllable switch module 20 is further configured to turn on a second controllable switch unit 202 built in when the main power source 101 is powered off and the auxiliary power source 102 is powered on, so that the auxiliary power source 102 supplies power to the load.
It will be appreciated that when the main power supply 101 is powered down and the auxiliary power supply 102 is powered up, the second controllable switch unit 202 is in an on state and the first controllable switch unit 201 is in an off state, so that the load can be powered by the auxiliary power supply 102. When both the main power supply 101 and the subsidiary power supply 102 are powered down, no power is supplied to the load.
In a specific implementation, the auxiliary power source 102 may include a plurality of auxiliary power sources, the second controllable switch unit 202 may also include a plurality of second controllable switch units, and the number of the second controllable switch units is the same as that of the auxiliary power sources, so that when one auxiliary power source is powered on and the main power source is powered off, the second controllable switch unit corresponding to the auxiliary power source is in a conducting state, and the auxiliary power source can supply power to the load.
In this embodiment, the flyback power supply parallel switching circuit includes: the power module comprises a main power supply and at least one auxiliary power supply and a controllable switch module, wherein a first built-in controllable switch unit is switched on when the main power supply is powered on through the controllable switch module so that the main power supply supplies power to a load, and then a second built-in controllable switch unit is switched on when the main power supply is powered off and the auxiliary power supply is powered on through the controllable switch module so that the auxiliary power supply supplies power to the load. In the embodiment, when the main power supply is powered on and whether the auxiliary power supply is powered on or not, the main power supply supplies power to the load, and when the main power supply is powered off and the auxiliary power supply is powered on, the load is supplied with power through the auxiliary power supply.
Further, referring to fig. 2, fig. 2 is a functional block diagram of a flyback power supply parallel switching circuit according to a second embodiment of the present invention.
As shown in fig. 2, the parallel switching circuit of the flyback power supply further includes: a switch control module 30;
the input end of the switch control module 30 is connected to the main power supply 101 and the auxiliary power supply 102, respectively, the first output end of the switch control module 30 is connected to the enable end of the second controllable switch unit 202, and the second output end of the switch control module 30 is grounded;
the switch control module 30 is configured to transmit a low level signal to an enable end of the second controllable switch unit 202 when the main power source 101 is powered on;
the second controllable switch unit 202 is configured to turn off when the enable terminal receives the low level signal.
It can be understood that the conducting states of the first controllable switch unit 201 and the second controllable switch unit 202 are related to the level signal of the enable terminal, and when the enable terminal receives a high level signal, the first controllable switch unit 201 and the second controllable switch unit 202 are in the conducting state; when the enable terminal receives a low level signal, the first controllable switch unit 201 and the second controllable switch unit 202 are in an off state.
It will be appreciated that when the main power supply 101 is powered on, the enable terminal of the second controllable switch unit 202 will receive a low signal, at which time the second controllable switch unit 202 will be switched off.
Further, the switch control module 30 includes: a third transistor Q3;
the base of the third transistor Q3 is connected to the enable terminals of the main power supply 101 and the first controllable switch unit 201, respectively, the collector of the third transistor Q3 is connected to the enable terminals of the auxiliary power supply 102 and the second controllable switch unit 202, respectively, and the emitter of the third transistor Q3 is grounded.
In a specific implementation, Vin in fig. 2 represents an input terminal, EN represents an enable terminal, and Vout represents an output terminal, after the main power source 101 is powered on, the output voltage V1 is connected to the enable terminal EN of the first controllable switch unit 201, and at this time, the enable terminal EN receives a high-level signal, the first controllable switch unit 201 is turned on, and the output voltage V1 supplies power to the load through the first controllable switch unit 201. Meanwhile, the output voltage V1 is connected to the base of the third transistor Q3, the third transistor Q3 is turned on, the enable terminal of the second controllable switch unit 202 is at a low level, and the second controllable switch unit 202 is turned off.
When the main power source 101 and the auxiliary power source 102 are both powered on, the output voltage V2 is connected to the enable terminal EN of the second controllable switch unit 202, but since the third transistor Q3 is always in a conducting state, the enable terminal EN of the second controllable switch unit 202 is continuously at a low level, and the second controllable switch unit 202 cannot be conducted, or power is supplied to the load through the main power source 101.
When the main power source 101 is powered off and the auxiliary power source 102 is powered on, the output voltage V1 is zero, at this time, the third transistor Q3 is in an off state, the enable terminal EN of the second controllable switch unit 202 is at a high level, and the second controllable switch unit 202 enters an on state, so that the load can be supplied with power through the auxiliary power source 102.
Further, the switch control module 30 further includes: a seventh resistor R7 and an eighth resistor R8;
a first end of the seventh resistor R7 is connected to the input terminals of the main power source 101 and the first controllable switch unit 201, a second end of the seventh resistor R7 is connected to the enable terminal of the first controllable switch unit 201 and the base of the third transistor Q3, a first end of the eighth resistor R8 is connected to the input terminals of the auxiliary power source 102 and the second controllable switch unit 202, and a second end of the eighth resistor R8 is connected to the enable terminal of the second controllable switch unit 202 and the collector of the third transistor Q3.
It should be understood that, the seventh resistor R7 and the eighth resistor R8 in this embodiment function to limit current, so as to avoid damaging components in the circuit, and a specific resistance value may be set according to actual conditions, which is not limited in this embodiment.
Further, referring to fig. 3, fig. 3 is a schematic circuit structure diagram of a parallel switching circuit of a flyback power supply according to the present invention.
As shown in fig. 3, the first controllable switch unit 201 comprises: the transistor comprises a first MOS transistor M1, a second MOS transistor M2, a first resistor R1, a second resistor R2, a first triode Q1 and a third resistor R3;
the drain of the first MOS transistor M1 is connected to the main power source 101, the source of the first MOS transistor M1 is connected to the source of the second MOS transistor M2 and the first end of the first resistor R1, the gate of the first MOS transistor M1 is connected to the second end of the first resistor R1, the gate of the second MOS transistor M2 and the first end of the second resistor R2, the drain of the second MOS transistor M2 is connected to the load, the second end of the second resistor R2 is connected to the collector of the first triode Q1, the emitter of the first triode Q1 is grounded, the first end of the third resistor R3 is connected to the input terminals of the main power source 101 and the switch control module 30, and the second end of the third resistor R3 is connected to the base of the first triode Q1.
Further, the second controllable switch unit 202 comprises: a third MOS transistor M3, a fourth MOS transistor M4, a fourth resistor R4, a fifth resistor R5, a second triode Q2, and a sixth resistor R6;
the drain of the third MOS transistor M3 is connected to the auxiliary power source 102, the source of the third MOS transistor M3 is connected to the source of the fourth MOS transistor M4 and the first end of the fourth resistor R4, the gate of the third MOS transistor M3 is connected to the second end of the fourth resistor R4, the gate of the fourth MOS transistor M4 and the first end of the fifth resistor R5, the drain of the fourth MOS transistor M4 is connected to the load, the second end of the fifth resistor R5 is connected to the collector of the second triode Q2, the emitter of the second triode Q2 is grounded, the first end of the sixth resistor R6 is connected to the auxiliary power source 102 and the first output end of the switch control module 30, and the second end of the sixth resistor R6 is connected to the base of the second triode Q2.
It should be understood that the circuit structures of the first controllable switch unit 201 and the second controllable switch unit 202 in this embodiment are the same, and the first controllable switch unit 201 and the second controllable switch unit 202 may be integrated load switch chips, such as the SGM2566, or may be integrated load switch chips.
In a specific implementation, for the first controllable switch unit 201, when the enable terminal is at a high level, the first transistor Q1 is turned on, the third resistor R3 is a current-limiting resistor, at this time, the second resistor R2 is equivalent to ground, the voltage Vo1 output by the main power source 101 is divided by a body diode of the first MOS transistor and the first resistor R1 and the second resistor R2, so that the first MOS transistor M1 and the second MOS transistor M2 meet the driving turn-on condition, and the Vo1 is output to the Vo pin through the first MOS transistor M1 and the second MOS transistor M2, so that the load can be powered. The resistances of the first resistor R1 and the second resistor R2 can be calculated according to the conduction conditions of the first MOS transistor M1 and the second MOS transistor M2, and the specific resistances are not limited in this embodiment. When the enable terminal is suspended or at a low level, the first triode Q1 is turned off, the first resistor R1 and the second resistor R2 cannot form a voltage division loop, the first MOS transistor M1 or the second MOS transistor M2 is turned off due to lack of a driving condition, the bidirectional voltage is blocked by a body diode in the MOS transistor, and at this time, the Vo pin has no voltage.
Similarly, the control logic of the second controllable switch unit 202 is the same as the control logic of the first controllable switch unit 201, and this embodiment will not be described in detail.
Further, the main power supply 101 includes: a rectifying unit 1011 and a main voltage transforming unit 1012;
the input end of the rectifying unit 1011 is connected with a three-phase alternating current, the output end of the rectifying unit 1011 is connected with the input end of a main voltage-varying unit 1012, and the output end of the main voltage-varying unit 1012 is respectively connected with the input end of the switch control module 30 and the input end of the first controllable switch unit 201;
the rectifying unit 1011 is configured to rectify the three-phase ac to obtain dc power, and transmit the dc power to the main voltage transforming unit 1012;
it is understood that the rectifying unit 1011 in this embodiment may be a rectifying diode, or may be other circuits capable of rectifying, and this embodiment is not limited in this respect.
The main voltage transformation unit 1012 is configured to transform the direct current to obtain a main voltage signal, and transmit the main voltage signal to an input end of the first controllable switch unit 201;
it should be understood that the main voltage is Vo1 in fig. 3, and the main voltage unit 1012 can output multiple voltages to supply other loads in addition to the main voltage signal.
The first main control switch unit 201 is further configured to supply power to the load according to the main voltage signal when the current state is in a conducting state.
Further, the main voltage transforming unit 1012 is further configured to transmit the main voltage signal to an input terminal of the switch control module 30;
the switch control module 30 is further configured to enter a conducting state when receiving the main voltage signal, so that the enable terminal of the second controllable switch unit 202 receives a low level signal.
Further, the auxiliary power supply 102 includes: an auxiliary transforming unit 1021;
the input end of the auxiliary voltage transformation unit 1021 is connected with an external direct current power supply, and the output end of the auxiliary voltage transformation unit 1021 is connected with the input end of the second controllable switch unit 202;
the auxiliary voltage unit 1021 is configured to transform the direct current provided by the external direct current power supply to obtain an auxiliary voltage signal, and transmit the auxiliary voltage signal to the input end of the second controllable switch unit 202;
the second controllable switch unit 202 is further configured to supply power to the load according to the auxiliary voltage signal when the current state is in a conducting state.
In a specific implementation, the RL in fig. 3 is a load, after the main power source 101 is powered on by alternating current, the Vo1 is output after rectification and voltage transformation, the first triode Q1 is driven to be turned on, the first MOS transistor M1 and the second MOS transistor M2 are further turned on, meanwhile, the Vo1 drives the third triode Q3 to be turned on, the second triode Q2 is further turned off due to no base current, the third MOS transistor M3 and the fourth MOS transistor M4 are turned off due to lack of a driving on condition, the parallel output voltage Vo refers to the main power source output voltage Vo1 to supply power to the load, and the main power source 101 performs feedback regulation output according to Vo 1; and the main feedback output Vo2 of the auxiliary power supply 102 is not affected by the parallel output due to the turn-off of the third MOS transistor M3 and the fourth MOS transistor M4, and when the auxiliary power supply 102 is powered on by an external direct current power supply, the feedback regulation output can be automatically established, so that the independent feedback regulation of the power supply is realized. The autonomous establishment of the feedback regulation output can be realized by a PWM control chip.
And after the main power supply 101 is powered off, Vo1 is quickly powered off, the first triode Q1 is turned off, the first MOS transistor M1 and the second MOS transistor M2 are blocked, meanwhile, the third triode Q3 is turned off, the second diode Q2 is driven by Vo2 to be conducted, the third MOS transistor M3 and the fourth MOS transistor M4 meet driving conditions to be conducted, and Vo is output in parallel with Vo reference to Vo2, so that switching control of the power supply is realized.
Further, referring to fig. 4, fig. 4 is a functional block diagram of a flyback power supply parallel switching circuit according to a second embodiment of the present invention.
As shown in fig. 4, there is one main power supply and two auxiliary power supplies in fig. 4, and the number of auxiliary power supplies is the same as the number of controllable switch units. The auxiliary power supply 1 and the auxiliary power supply 2 can be locked after the main power supply is powered on, no matter whether the auxiliary power supply is powered on or not, the parallel output bus only outputs power from the main power supply, when the main power supply is not powered on, the auxiliary power supply 1 is powered on, the auxiliary power supply 2 can be locked, the parallel bus only outputs power from the auxiliary power supply 1, and when the auxiliary power supply 2 is powered on and the main power supply and the auxiliary power supply 1 are not powered on and output, the parallel bus only outputs power from the auxiliary power supply 2.
Furthermore, only a triode logic circuit and a controllable switch unit are needed to be configured, and the scheme can be expanded to N power sources for parallel output.
In order to achieve the above object, the present invention further provides a flyback power supply parallel switching device, where the flyback power supply parallel switching device includes the flyback power supply parallel switching circuit as described above. The specific structure of the flyback power supply parallel switching circuit refers to the above embodiments, and since the flyback power supply parallel switching device adopts all technical solutions of all the above embodiments, all beneficial effects brought by the technical solutions of the above embodiments are at least achieved, and are not repeated herein.
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 and equivalents of the technical solutions of the present invention, which are made by using the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A flyback power parallel switching circuit, comprising: the power supply module comprises a main power supply and at least one auxiliary power supply, and a controllable switch module;
the power supply module is connected with the input end of the controllable switch module, and the output end of the controllable switch module is connected with a load;
the controllable switch module is used for conducting a first built-in controllable switch unit when the main power supply is powered on so as to enable the main power supply to supply power to the load;
the controllable switch module is further configured to switch on a built-in second controllable switch unit when the main power supply is powered off and the auxiliary power supply is powered on, so that the auxiliary power supply supplies power to the load.
2. The flyback power parallel switching circuit of claim 1, wherein the flyback power parallel switching circuit further comprises: a switch control module;
the input end of the switch control module is respectively connected with the main power supply and the auxiliary power supply, the first output end of the switch control module is connected with the enabling end of the second controllable switch unit, and the second output end of the switch control module is grounded;
the switch control module is used for transmitting a low level signal to an enabling end of the second controllable switch unit when the main power supply is powered on;
the second controllable switch unit is used for being switched off when the enabling end receives the low-level signal.
3. The flyback power parallel switching circuit of claim 2, wherein the first controllable switching unit comprises: the transistor comprises a first MOS transistor, a second MOS transistor, a first resistor, a second resistor, a first triode and a third resistor;
the drain electrode of first MOS pipe with the main power supply is connected, the source electrode of first MOS pipe respectively with the source electrode of second MOS pipe with the first end of first resistance is connected, the grid of first MOS pipe respectively with the second end of first resistance the grid of second MOS pipe and the first end of second resistance is connected, the drain electrode of second MOS pipe with the load is connected, the second end of second resistance with the collecting electrode of first triode is connected, the projecting pole ground connection of first triode, the first end of third resistance respectively with the main power supply with the input of on-off control module is connected, the second end of third resistance with the base of first triode is connected.
4. The flyback power parallel switching circuit of claim 2, wherein the second controllable switching cell comprises: the third MOS tube, the fourth resistor, the fifth resistor, the second triode and the sixth resistor;
the drain electrode of third MOS pipe with auxiliary power connects, the source electrode of third MOS pipe respectively with the source electrode of fourth MOS pipe with the first end of fourth resistance is connected, the grid electrode of third MOS pipe respectively with the second end of fourth resistance the grid electrode of fourth MOS pipe and the first end of fifth resistance is connected, the drain electrode of fourth MOS pipe with the load is connected, the second end of fifth resistance with the collecting electrode of second triode is connected, the projecting pole ground connection of second triode, the first end of sixth resistance respectively with auxiliary power with the first output of on-off control module is connected, the second end of sixth resistance with the base of second triode is connected.
5. The flyback power parallel switching circuit of claim 2, wherein the switch control module comprises: a third triode;
the base electrode of the third triode is respectively connected with the main power supply and the enabling end of the first controllable switch unit, the collector electrode of the third triode is respectively connected with the auxiliary power supply and the enabling end of the second controllable switch unit, and the emitting electrode of the third triode is grounded.
6. The flyback power parallel switching circuit of claim 5, wherein the switch control module further comprises: a seventh resistor and an eighth resistor;
the first end of the seventh resistor is connected with the main power supply and the input end of the first controllable switch unit respectively, the second end of the seventh resistor is connected with the enabling end of the first controllable switch unit and the base electrode of the third triode respectively, the first end of the eighth resistor is connected with the auxiliary power supply and the input end of the second controllable switch unit respectively, and the second end of the eighth resistor is connected with the enabling end of the second controllable switch unit and the collector electrode of the third triode respectively.
7. The flyback power parallel switching circuit of claim 6, wherein the main power supply comprises: the rectifier unit and the main transformer unit;
the input end of the rectification unit is connected with three-phase alternating current, the output end of the rectification unit is connected with the input end of a main voltage transformation unit, and the output end of the main voltage transformation unit is respectively connected with the input end of the switch control module and the input end of the first controllable switch unit;
the rectifying unit is used for rectifying the three-phase alternating current to obtain direct current and transmitting the direct current to the main voltage transformation unit;
the main voltage transformation unit is used for transforming the direct current to obtain a main voltage signal and transmitting the main voltage signal to the input end of the first controllable switch unit;
the first main control switch unit is further configured to supply power to the load according to the main voltage signal when the current state is in a conducting state.
8. The flyback power parallel switching circuit of claim 7, wherein the main voltage unit is further configured to transmit the main voltage signal to an input of the switch control module;
the switch control module is further configured to enter a conducting state when receiving the main voltage signal, so that the enable end of the second controllable switch unit receives a low-level signal.
9. The flyback power parallel switching circuit of claim 1 or 7, wherein the auxiliary power supply comprises: an auxiliary voltage transformation unit;
the input end of the auxiliary voltage transformation unit is connected with an external direct-current power supply, and the output end of the auxiliary voltage transformation unit is connected with the input end of the second controllable switch unit;
the auxiliary voltage unit is used for transforming the direct current provided by the external direct current power supply to obtain an auxiliary voltage signal and transmitting the auxiliary voltage signal to the input end of the second controllable switch unit;
and the second controllable switch unit is also used for supplying power to the load according to the auxiliary voltage signal when the current state is in a conducting state.
10. A flyback power parallel switching device, characterized in that the flyback power parallel switching device comprises a flyback power parallel switching circuit as claimed in any of claims 1 to 9.
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| CN202123177954.4U CN216599118U (en) | 2021-12-16 | 2021-12-16 | Flyback power supply parallel switching circuit and device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2024044999A1 (en) * | 2022-08-31 | 2024-03-07 | 深圳市富兰瓦时技术有限公司 | Auxiliary power source for energy storage system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2024044999A1 (en) * | 2022-08-31 | 2024-03-07 | 深圳市富兰瓦时技术有限公司 | Auxiliary power source for energy storage system |
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