CN213072097U - Bus electrolytic capacitor protection circuit - Google Patents
Bus electrolytic capacitor protection circuit Download PDFInfo
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- CN213072097U CN213072097U CN202021716908.XU CN202021716908U CN213072097U CN 213072097 U CN213072097 U CN 213072097U CN 202021716908 U CN202021716908 U CN 202021716908U CN 213072097 U CN213072097 U CN 213072097U
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Abstract
The utility model discloses a generating line electrolytic capacitor protection circuit for generating line electrolytic capacitor to in the PFC circuit protects, include: the bus voltage sampling circuit is used for sampling bus voltage; the power switch circuit is connected between the three-phase output of the three-phase power supply and the PFC circuit in series; the auxiliary power supply circuit is used for converting the three-phase power supply into an auxiliary power supply after getting electricity; processing circuit for control when the busbar voltage of sampling increases and surpasss the threshold value that corresponds switch power supply circuit switches to the turn-off state, follows simultaneously auxiliary power supply circuit acquires auxiliary power supply, so, the utility model discloses can be through cutting off the power supply for busbar voltage can be controlled, and busbar voltage begins to descend, has played the effect of protection generating line electrolytic capacitor.
Description
Technical Field
The utility model relates to a power electronics field especially relates to a generating line electrolytic capacitor protection circuit.
Background
With the development of power electronic technology, more and more power electronic products have input PFC circuits, especially three-phase input high-power electronic products. Along with the coming out of the country of 'new capital construction', the construction of 'new energy automobile fills electric pile' will develop fast, and the module of charging is as the core component in the new energy automobile fills electric pile, and its failure rate has decided the failure rate of whole electric pile of filling, so the stability of the module of charging is especially important.
Fill electric pile long-term work in adverse circumstances such as high temperature, high humidity, dust, salt fog, the module that charges mostly dispels the heat for forced air cooling's mode, also can adsorb the electrically conductive dust of upper strata on the inside PCB board of module naturally, under certain abnormal conditions, can lead to the components and parts short circuit, causes the big electrolytic capacitor voltage of generating line to rise suddenly. Even if the module has a shutdown protection function, when the short-circuit point is at some special position, the sudden rise of voltage caused by uncontrolled rectification of the PFC can not be avoided. When the machine is shut down, the protection function cannot be achieved, and the fire caused by dense smoke due to the fact that the bus capacitor is finally exploded is a very serious accident.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the present invention is to provide a protection circuit for bus electrolytic capacitor, which is directed to the above-mentioned defects of the prior art.
The utility model provides a technical scheme that its technical problem adopted is: a bus electrolytic capacitor protection circuit is constructed for protecting a bus electrolytic capacitor in a PFC circuit, and comprises:
the input end of the bus voltage sampling circuit is connected with two ends of the bus electrolytic capacitor and is used for sampling bus voltage;
the power switch circuit is connected between the three-phase output of the three-phase power supply and the PFC circuit in series;
the input end of the auxiliary power supply circuit is connected between the three-phase output of the three-phase power supply and the power supply switch circuit and is used for converting the three-phase power supply into an auxiliary power supply after power is taken;
and the processing circuit is respectively connected with the output end of the bus voltage sampling circuit, the output end of the auxiliary power supply circuit and the control end of the power supply switch circuit, and is used for controlling the power supply switch circuit to be switched to a turn-off state when the sampled bus voltage is increased and exceeds a corresponding threshold value, and simultaneously acquiring the auxiliary power supply from the auxiliary power supply circuit.
Preferably, the PFC circuit includes two bus electrolytic capacitors connected in series between two buses, each of the bus voltage sampling circuits includes two input terminals, and the bus electrolytic capacitor protection circuit includes three bus voltage sampling circuits;
the first bus voltage sampling circuit is used for sampling half bus voltage, and two input ends of the first bus voltage sampling circuit are respectively connected with two ends of the first bus electrolytic capacitor; the second bus voltage sampling circuit is used for sampling half bus voltage, and two input ends of the second bus voltage sampling circuit are respectively connected with two ends of a second bus electrolytic capacitor; the third bus voltage sampling circuit is used for sampling the total bus voltage, and two input ends of the third bus voltage sampling circuit are respectively connected with two ends of the second bus electrolytic capacitor; the processing circuit controls the power switch circuit to be switched to an off state when any one of the two half bus voltages and the total bus voltage increases and exceeds a corresponding threshold value, and meanwhile, the auxiliary power circuit is started to supply power.
Preferably, the bus voltage sampling circuit comprises a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a first operational amplifier and a second operational amplifier;
one end of the first resistor and one end of the second resistor are used as two input ends of the bus voltage sampling circuit, the other end of the first resistor and the other end of the second resistor are respectively and correspondingly connected with a non-inverting input end and an inverting input end of the first operational amplifier, the first capacitor is connected between the inverting input end and the non-inverting input end of the first operational amplifier, the second capacitor and the third resistor are connected between the midpoint of an X capacitor at the front stage of the PFC circuit and the non-inverting input end of the first operational amplifier in parallel, the third capacitor and the fourth resistor are connected between the inverting input end and the output end of the first operational amplifier in parallel, the output end of the first operational amplifier is connected with the non-inverting input end of the second operational amplifier through a fifth resistor, the non-inverting input end of the second operational amplifier is further connected with the midpoint of the capacitor through a sixth resistor, and the inverting input end of the second operational amplifier is connected with the output, the output end of the second operational amplifier is further connected with one end of a seventh resistor, the other end of the seventh resistor serves as the output end of the bus voltage sampling circuit, and the fourth capacitor is connected between the detection output end and the midpoint of the capacitor.
Preferably, the power switch circuit comprises a relay, a relay contact is connected in series between each phase output of the three-phase power supply and the PFC circuit, and a coil power switch of the relay is controlled by the processing circuit.
Preferably, the auxiliary power supply circuit includes:
the three-phase rectifier bridge is connected with the three-phase output of the three-phase power supply and used for rectifying the output of the three-phase power supply and then outputting a direct-current power supply;
and the direct-current power supply conversion circuit is connected with the three-phase rectifier bridge and is used for converting the direct-current power supply output by the three-phase rectifier bridge into an auxiliary power supply required by the processing circuit.
Preferably, the dc power conversion circuit includes: the circuit comprises a first diode, a second diode, a third diode, a transformer, a fifth capacitor, a sixth capacitor, a seventh capacitor, an eighth capacitor, a ninth resistor, a switching tube and a power supply chip;
the eighth capacitor is connected between the positive output end and the negative output end of the three-phase rectifier bridge, the positive electrode of the first diode is connected with the positive output end of the three-phase rectifier bridge, the negative electrode of the first diode is connected with the first end of the primary side of the transformer, the fifth capacitor and the eighth resistor are connected in parallel between the first end of the primary side of the transformer and the negative electrode of the second diode, the second end of the primary side of the transformer is simultaneously connected with the positive electrode of the second diode and the input end of the switch tube, the control end of the switch tube receives a control signal, the output end of the switch tube is connected with the negative output end of the three-phase rectifier bridge through the ninth resistor, the first end of the secondary side of the transformer is connected with the positive electrode of the third diode, the negative electrode of the third diode is connected with the input end of the power chip, and the sixth capacitor is connected between the input end of the, the second end of the secondary side of the transformer is connected with the grounding end of the power supply chip, and the seventh capacitor is connected between the output end of the power supply chip and the grounding end.
The utility model discloses a generating line electrolytic capacitor protection circuit has following beneficial effect: the utility model discloses can trigger the switch circuit of power supply and turn-off when the busbar voltage of sampling increases and surpasss the threshold value that corresponds to turn off the power supply of whole PFC circuit, the simultaneous processing circuit is followed auxiliary power source circuit acquires auxiliary power source and maintains the operation, so, the utility model discloses can be through cutting off the power supply for busbar voltage can be controlled, and busbar voltage begins to descend, has played the effect of protection generating line electrolytic capacitor.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be 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 embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts:
FIG. 1 is a schematic diagram of the bus electrolytic capacitor protection circuit of the present invention;
FIG. 2 is a schematic wiring diagram of a three-way bus voltage sampling circuit;
FIG. 3 is a circuit diagram of a bus voltage sampling circuit;
fig. 4 is a circuit diagram of an auxiliary power supply circuit.
Detailed Description
In order to facilitate understanding of the present invention, the present invention will be described more fully hereinafter with reference to the accompanying drawings. Exemplary embodiments of the present invention are shown in the drawings. The invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It is noted that the term "coupled" or "connected" as used herein includes not only the direct coupling of two entities, but also the indirect coupling via other entities with beneficial and improved effects. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
The terms including ordinal numbers such as "first", "second", and the like used in the present specification may be used to describe various components, but the components are not limited by the terms. These terms are used only for the purpose of distinguishing one constituent element from other constituent elements. For example, a first component may be named a second component, and similarly, a second component may also be named a first component, without departing from the scope of the present invention.
The utility model discloses general thinking is: a power switch circuit is connected in series between the three-phase output of the three-phase power supply and the PFC circuit, and is in a conducting state in a normal state; utilize busbar voltage sampling circuit sampling busbar voltage, processing circuit controls when the busbar voltage of sampling increases and surpasss the threshold value that corresponds switch circuit switches to the turn-off state, simultaneously, the utility model discloses increase auxiliary power supply circuit and guarantee processing circuit's power supply, auxiliary power supply circuit's input connect in three phase current's three-phase output with between the switch circuit, so even switch circuit cuts off, can not influence auxiliary power supply circuit's power supply yet, so in case processing circuit has turned off switch circuit, processing circuit can follow in step auxiliary power supply circuit acquires auxiliary power supply and maintains the operation.
In order to better understand the technical solutions, the technical solutions will be described in detail below with reference to the drawings and the specific embodiments of the specification, and it should be understood that the specific features in the embodiments and examples of the present invention are detailed descriptions of the technical solutions of the present application, but not limitations of the technical solutions of the present application, and the technical features in the embodiments and examples of the present invention can be combined with each other without conflict.
Referring to fig. 1, the bus electrolytic capacitor protection circuit of the present invention is used for protecting a bus electrolytic capacitor in a PFC circuit. The front stage of the PFC circuit is an input circuit with EMC, the input circuit comprises three paths of X capacitors, and each path of X capacitor comprises two X capacitors connected in parallel. One end of each of the three X capacitors is connected with the three-phase output of the three-phase power supply, and the other end of each of the three X capacitors is connected with a capacitor midpoint X-GND in common. The PFC circuit comprises two buses and two bus electrolytic capacitors, wherein the two bus electrolytic capacitors are connected between the two buses in series.
The bus electrolytic capacitor protection circuit comprises a bus voltage sampling circuit 1, a power switch circuit 2, an auxiliary power circuit 4 and a processing circuit 3. The input end of the bus voltage sampling circuit 1 is connected with two ends of the bus electrolytic capacitor, and the output end of the bus voltage sampling circuit is connected with the processing circuit 3; the power switch circuit 2 is connected in series between the three-phase output of the three-phase power supply and the PFC circuit, the control end of the power switch circuit is connected with the processing circuit 3, and the power switch circuit 2 is in a conducting state in normal times; the input end of the auxiliary power circuit 4 is connected between the three-phase output of the three-phase power supply and the power switch circuit 2, and the output end is connected with the processing circuit 3.
Busbar voltage sampling circuit 1 is used for sampling busbar voltage, and auxiliary power supply circuit 4 is used for following three phase current gets the electricity back and converts into auxiliary power supply, and processing circuit 3 is used for controlling when the busbar voltage of sampling increases and exceeds corresponding threshold value switch circuit 2 switches to the off-state, follows simultaneously auxiliary power supply circuit 4 acquires auxiliary power supply.
Specifically, the power switch circuit 2 of the present embodiment includes a relay, and a relay contact is connected in series between each phase output of the three-phase power supply and the PFC circuit, as shown in KA, KB, and KC in the figure, and a coil power switch of the relay is controlled by the processing circuit 3.
Specifically, referring to fig. 2, the bus electrolytic capacitor protection circuit in this embodiment includes three bus voltage sampling circuits 1, and each bus voltage sampling circuit 1 includes two input terminals. The first bus voltage sampling circuit 1 is used for sampling half bus voltage, and two input ends of the first bus voltage sampling circuit are respectively connected with two ends of a first bus electrolytic capacitor; the second bus voltage sampling circuit 1 is used for sampling half bus voltage, and two input ends of the second bus voltage sampling circuit are respectively connected with two ends of a second bus electrolytic capacitor; the third bus voltage sampling circuit 1 is used for sampling the total bus voltage, and two input ends of the third bus voltage sampling circuit are respectively connected with two ends of the second bus electrolytic capacitor; the processing circuit 3 controls the power switch circuit 2 to switch to an off state when any one of the two half bus voltages and the total bus voltage increases and exceeds a corresponding threshold, and simultaneously starts the auxiliary power circuit 4 to supply power.
For example, after the module where the PFC circuit is located is powered on, the power switch circuit 2 is turned on, and at this time, the voltage on the electrolytic capacitor of the bus of the module is a three-phase input uncontrolled rectified voltage with a value of Vbus1380 x 1.414V 537V, considering that the input to the actual grid is typically around 400V, the actual Vbus1400 x 1.414V 565V, the two bus electrolytic capacitors are 450V, assuming that the sampled total bus voltage and the two half-bus voltages are V respectivelybussampall、Vbussamphalf1、Vbussamphalf2. Under the starting state of the module, the working bus voltage Vnormal ensures a floating voltage range V in normal workingΔWhen the actual bus voltage Vmax＝Vact>(Vnormal+VΔ) In order to prevent the misoperation of the protection method, the module strategy is driven by an alarm switch. After the drive is turned off, based on this embodiment, the bus voltage and the two half bus voltages are sampled, if VmaxA downward trend is presented indicating that the fault is due to control or grid waveforms with no risk of anomaly. If VmaxContinue to become larger as Vbussampall>900V or Vbussamphalf1>450V or Vbussamphalf2>450V, which indicates that the fault is abnormal at the moment, the power switch circuit 2 is controlled to be disconnected from the physical connection with the power grid, the bus voltage is controlled to start to drop, and the function of protecting the bus electrolytic capacitor is achieved.
Referring to fig. 3, the bus voltage sampling circuit 1 includes: the circuit comprises a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, a first capacitor C1, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a first operational amplifier U1 and a second operational amplifier U3.
One end of the first resistor R1 and one end of the second resistor R2 are respectively used as two input ends Cin1 and Cin2 of the bus voltage sampling circuit 1, the other end of the first resistor R1 and the other end of the second resistor R2 are respectively and correspondingly connected with a non-inverting input end and an inverting input end of the first operational amplifier U1, the first capacitor C1 is connected between the inverting input end and the non-inverting input end of the first operational amplifier U1, the second capacitor C2 and the third resistor R3 are connected between the non-inverting input end of the first operational amplifier U1 and the midpoint of the capacitor in parallel, the third capacitor C3 and the fourth resistor R4 are connected between the inverting input end and the output end of the first operational amplifier U1 in parallel, the output end of the first operational amplifier U1 is connected with the non-inverting input end of the second operational amplifier U3 through the fifth resistor R5, the non-inverting input end of the second operational amplifier U3 is further connected with the sixth resistor R5, the inverting input end of the second operational amplifier U3 is connected with the inverting input end of the second operational amplifier U57324, the output end of the second operational amplifier U3 is further connected to one end of a seventh resistor R7, the other end of the seventh resistor R7 serves as the output end of the bus voltage sampling circuit 1, and the fourth capacitor C4 is connected between the detection output end and the midpoint of the capacitor.
In this embodiment, a first input terminal Cin1 of the first bus voltage sampling circuit 1 is connected to the positive electrode of the first bus electrolytic capacitor, and a second input terminal Cin2 is connected to the negative electrode of the first bus electrolytic capacitor. The first input end Cin1 of the second bus voltage sampling circuit 1 is connected with the anode of the second bus electrolytic capacitor, and the second input end Cin2 is connected with the cathode of the second bus electrolytic capacitor. The first input end Cin1 of the third bus voltage sampling circuit 1 is connected with the anode of the first bus electrolytic capacitor, and the second input end Cin2 is connected with the cathode of the second bus electrolytic capacitor.
In this embodiment, the processing circuit 3 controls the power switch circuit 2 to disconnect the physical connection with the power grid when the processing circuit is abnormal, so that the circuit does not supply power, and in order to ensure that the power supply of the processing circuit 3 is normal, the processing circuit 3 may control whether to enable (access) the auxiliary power output by the auxiliary power circuit 4 through the power switch. Referring to fig. 4, the auxiliary power supply circuit 4 includes:
a three-phase rectifier bridge 41 connected to the three-phase output of the three-phase power supply, and configured to rectify the output of the three-phase power supply and output a dc power supply;
and the direct-current power supply conversion circuit 42 is connected with the three-phase rectifier bridge 41 and is used for converting the direct-current power supply output by the three-phase rectifier bridge 41 into an auxiliary power supply required by the processing circuit 3.
Specifically, the dc power conversion circuit 42 includes: the circuit comprises a first diode D1, a second diode D2, a third diode D3, a transformer T, a fifth capacitor C5, a sixth capacitor C6, a seventh capacitor C7, an eighth capacitor C8, a ninth resistor R9, a switching tube Q1 and a power chip. The switching tube Q1 is specifically a MOS tube. The first end of the primary side of the transformer T and the second end of the secondary side are homonymous ends.
An eighth capacitor C8 is an electrolytic capacitor, and is connected between the positive output terminal and the negative output terminal of the three-phase rectifier bridge 41, the positive electrode of a first diode D1 is connected to the positive output terminal of the three-phase rectifier bridge 41, the negative electrode of a first diode D1 is connected to the first end of the primary side of the transformer T, the fifth capacitor C5 and an eighth resistor are connected in parallel between the first end of the primary side of the transformer T and the negative electrode of the second diode D2, the second end of the primary side of the transformer T is connected to the positive electrode of the second diode D2 and the input terminal of the switching tube Q1 at the same time, the control terminal of the switching tube Q1 receives a PWM control signal from the processing circuit 3, the output terminal of the switching tube Q1 is connected to the negative output terminal of the three-phase rectifier bridge 41 via a ninth resistor R9, the first end of the secondary side of the transformer T is connected to the positive electrode of the third diode D3, and the negative electrode of the third diode D3 is connected to the, the sixth capacitor C6 is connected between the input terminal of the power chip and the ground terminal, the second terminal of the secondary side of the transformer T is connected to the ground terminal of the power chip, the seventh capacitor C7 is connected between the output terminal of the power chip and the ground terminal, and the output terminal and the ground terminal of the power chip output 3.3V of the auxiliary power supply.
To sum up, the utility model discloses a generating line electrolytic capacitor protection circuit has following beneficial effect: the utility model discloses can trigger the switch circuit of power supply and turn-off when the busbar voltage of sampling increases and surpasss the threshold value that corresponds to turn off the power supply of whole PFC circuit, the simultaneous processing circuit is followed auxiliary power source circuit acquires auxiliary power source and maintains the operation, so, the utility model discloses can be through cutting off the power supply for busbar voltage can be controlled, and busbar voltage begins to descend, has played the effect of protection generating line electrolytic capacitor.
While the embodiments of the present invention have been described with reference to the accompanying drawings, the present invention is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and many modifications may be made by one skilled in the art without departing from the spirit and scope of the present invention as defined in the appended claims.
Claims (6)
1. A bus electrolytic capacitor protection circuit for protecting a bus electrolytic capacitor in a PFC circuit, comprising:
the input end of the bus voltage sampling circuit is connected with two ends of the bus electrolytic capacitor and is used for sampling bus voltage;
the power switch circuit is connected between the three-phase output of the three-phase power supply and the PFC circuit in series;
the input end of the auxiliary power supply circuit is connected between the three-phase output of the three-phase power supply and the power supply switch circuit and is used for converting the three-phase power supply into an auxiliary power supply after power is taken;
and the processing circuit is respectively connected with the output end of the bus voltage sampling circuit, the output end of the auxiliary power supply circuit and the control end of the power supply switch circuit, and is used for controlling the power supply switch circuit to be switched to a turn-off state when the sampled bus voltage is increased and exceeds a corresponding threshold value, and simultaneously acquiring the auxiliary power supply from the auxiliary power supply circuit.
2. The bus electrolytic capacitor protection circuit of claim 1, wherein the PFC circuit comprises two bus electrolytic capacitors connected in series between two buses, each of the bus voltage sampling circuits comprises two input terminals, and the bus electrolytic capacitor protection circuit comprises three of the bus voltage sampling circuits;
the first bus voltage sampling circuit is used for sampling half bus voltage, and two input ends of the first bus voltage sampling circuit are respectively connected with two ends of the first bus electrolytic capacitor; the second bus voltage sampling circuit is used for sampling half bus voltage, and two input ends of the second bus voltage sampling circuit are respectively connected with two ends of a second bus electrolytic capacitor; the third bus voltage sampling circuit is used for sampling the total bus voltage, and two input ends of the third bus voltage sampling circuit are respectively connected with two ends of the second bus electrolytic capacitor; the processing circuit controls the power switch circuit to be switched to an off state when any one of the two half bus voltages and the total bus voltage increases and exceeds a corresponding threshold value, and meanwhile, the auxiliary power circuit is started to supply power.
3. The bus electrolytic capacitor protection circuit of claim 2, wherein the bus voltage sampling circuit comprises a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a first operational amplifier and a second operational amplifier;
one end of the first resistor and one end of the second resistor are used as two input ends of the bus voltage sampling circuit, the other end of the first resistor and the other end of the second resistor are respectively and correspondingly connected with a non-inverting input end and an inverting input end of the first operational amplifier, the first capacitor is connected between the inverting input end and the non-inverting input end of the first operational amplifier, the second capacitor and the third resistor are connected between the midpoint of an X capacitor at the front stage of the PFC circuit and the non-inverting input end of the first operational amplifier in parallel, the third capacitor and the fourth resistor are connected between the inverting input end and the output end of the first operational amplifier in parallel, the output end of the first operational amplifier is connected with the non-inverting input end of the second operational amplifier through a fifth resistor, the non-inverting input end of the second operational amplifier is further connected with the midpoint of the capacitor through a sixth resistor, and the inverting input end of the second operational amplifier is connected with the output, the output end of the second operational amplifier is further connected with one end of a seventh resistor, the other end of the seventh resistor serves as the output end of the bus voltage sampling circuit, and the fourth capacitor is connected between the detection output end and the midpoint of the capacitor.
4. The bus bar electrolytic capacitor protection circuit of claim 1, wherein the power switch circuit comprises a relay, a relay contact is connected in series between each phase output of the three-phase power supply and the PFC circuit, and a coil power switch of the relay is controlled by the processing circuit.
5. The bus electrolytic capacitor protection circuit of claim 1, wherein the auxiliary power supply circuit comprises:
the three-phase rectifier bridge is connected with the three-phase output of the three-phase power supply and used for rectifying the output of the three-phase power supply and then outputting a direct-current power supply;
and the direct-current power supply conversion circuit is connected with the three-phase rectifier bridge and is used for converting the direct-current power supply output by the three-phase rectifier bridge into an auxiliary power supply required by the processing circuit.
6. The bus electrolytic capacitor protection circuit of claim 5, wherein the DC power conversion circuit comprises: the circuit comprises a first diode, a second diode, a third diode, a transformer, a fifth capacitor, a sixth capacitor, a seventh capacitor, an eighth capacitor, a ninth resistor, a switching tube and a power supply chip;
the eighth capacitor is connected between the positive output end and the negative output end of the three-phase rectifier bridge, the positive electrode of the first diode is connected with the positive output end of the three-phase rectifier bridge, the negative electrode of the first diode is connected with the first end of the primary side of the transformer, the fifth capacitor and the eighth resistor are connected in parallel between the first end of the primary side of the transformer and the negative electrode of the second diode, the second end of the primary side of the transformer is simultaneously connected with the positive electrode of the second diode and the input end of the switch tube, the control end of the switch tube receives a control signal, the output end of the switch tube is connected with the negative output end of the three-phase rectifier bridge through the ninth resistor, the first end of the secondary side of the transformer is connected with the positive electrode of the third diode, the negative electrode of the third diode is connected with the input end of the power chip, and the sixth capacitor is connected between the input end of the, the second end of the secondary side of the transformer is connected with the grounding end of the power supply chip, and the seventh capacitor is connected between the output end of the power supply chip and the grounding end.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021716908.XU CN213072097U (en) | 2020-08-17 | 2020-08-17 | Bus electrolytic capacitor protection circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021716908.XU CN213072097U (en) | 2020-08-17 | 2020-08-17 | Bus electrolytic capacitor protection circuit |
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| CN213072097U true CN213072097U (en) | 2021-04-27 |
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