CN209299131U - A kind of power circuit with module protection function - Google Patents
A kind of power circuit with module protection function Download PDFInfo
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- CN209299131U CN209299131U CN201822001362.9U CN201822001362U CN209299131U CN 209299131 U CN209299131 U CN 209299131U CN 201822001362 U CN201822001362 U CN 201822001362U CN 209299131 U CN209299131 U CN 209299131U
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Abstract
The utility model embodiment discloses a kind of power circuit with module protection function, comprising: multiple protective resistances, rectifier bridge, capacitor, inverter bridge；Wherein, each protective resistance is connected between an input line of external power supply and an input terminal of the rectifier bridge；The cathode output end of the rectifier bridge is sequentially connected the positive and described inverter bridge of the capacitor；The cathode output end of the rectifier bridge is grounded；The cathode of the capacitor is grounded；The capacitor and the inverter bridge and downlink connection.With this, in the moment powered on for the first time, regardless of certain in inverter bridge is mutually exported with whether ground wire (the earth) be short-circuit, generated dash current can carry out effective current limliting by protective resistance, preferably protect power module with this, avoid the damage of element.
Description
Technical field
The utility model relates to the protection construction applications of power module, in particular to a kind of power with module protection function
Circuit.
Background technique
At present in terms of the control in many fields, such as elevator etc., be related to frequency converter, and main circuit of frequency converter need through
The transformation of exchange -- direct current -- exchange is crossed, and main circuit of frequency converter median generatrix capacitor is generally all bigger, with this, powers on for the first time
Moment, dash current can be very big, is easy damage rectifier diode.
In addition, in main circuit of frequency converter all there is parasitic backward dioded in three-phase output bridge arm, if three-phase exports bridge
In certain mutually export with ground wire (the earth) short circuit, parasitism backward dioded can also constitute a part of rectification circuit on bridge arm, directly
It connects to bus capacitor and charges, so that the dash current of short time is equally very big, be equally enough to damage backward dioded, and then cause
The damage of whole device.
Thus need a kind of current better scheme to solve the defect.
Utility model content
In view of this, the utility model proposes a kind of power circuits with module protection function, in the wink powered on for the first time
Between, regardless of certain in inverter bridge is mutually exported with whether ground wire (the earth) be short-circuit, generated dash current can be limited effectively
Stream, preferably protects power module with this, avoids the damage of element.
Specifically, the utility model proposes embodiments in detail below:
The utility model embodiment discloses a kind of power circuit with module protection function, comprising: multiple protective resistances,
Rectifier bridge, capacitor, inverter bridge；Wherein,
Each protective resistance is connected between an input line of external power supply and an input terminal of the rectifier bridge；
The cathode output end of the rectifier bridge is sequentially connected the positive and described inverter bridge of the capacitor；The rectifier bridge
Cathode output end ground connection；
The cathode of the capacitor is grounded；The capacitor and the inverter bridge and downlink connection.
In a specific embodiment, the protective resistance is thermistor.
In a specific embodiment, the protective resistance is negative tempperature coefficient thermistor.
In a specific embodiment, the protective resistance includes two resistance or three resistance；
When the protective resistance includes first resistor and second resistance, the first resistor is connected to external AC power source
An input line and the rectifier bridge an input terminal between；The second resistance is connected to the another of the external AC power source
Between input line and another input terminal of the rectifier bridge.
In a specific embodiment, when the protective resistance includes first resistor and second resistance, the rectification
Bridge includes first diode, the second diode, third diode, the 4th diode；Wherein,
Positive incoming junction is provided between the cathode of the first diode and the anode of second diode；Institute
State the firewire that positive incoming junction connects the external AC power source；
Cathode incoming junction is provided between the cathode of the third diode and the anode of the 4th diode；Institute
State the zero curve that cathode incoming junction connects the external AC power source；
It is defeated that the positive tie point between the anode of the third diode of the first diode connects the cathode
Outlet；
It is defeated that tie point between the cathode of second diode and the cathode of the 4th diode connects the anode
Outlet.
In a specific embodiment, the capacitor specifically: filter capacitor.
In a specific embodiment, the inverter bridge includes three-phase bridge module；The three-phase bridge module includes: three
Upper bridge arm IGBT pipe and three lower bridge arm IGBT pipes；Wherein, the collector of the upper bridge arm IGBT pipe is all connected with the capacitor
Anode；
The emitter of the upper bridge arm IGBT pipe is all connected with the collector of the lower bridge arm IGBT pipe, while the upper bridge arm
The emitter of IGBT pipe is used to connect threephase load,
The grid of three upper bridge arm IGBT pipes is respectively connected to three phase control signal of bridge arm；
The grid of three lower bridge arm IGBT pipes is respectively connected to three phase control signal of lower bridge arm；
The emitter of three lower bridge arm IGBT pipes connects the cathode of the capacitor.
In a specific embodiment, the upper bridge arm IGBT pipe is consistent with the structure of the lower bridge arm IGBT pipe.
In a specific embodiment, the upper bridge arm IGBT pipe and lower bridge arm IGBT pipe include IGBT and the
Five diodes；
Wherein, the anode of the 5th diode connects the emitter of the IGBT；The cathode of 5th diode connects
Connect the collector of the IGBT.
In a specific embodiment, the 5th diode is specially backward dioded.
With this, the utility model embodiment discloses a kind of power circuit with module protection function, comprising: multiple protections
Resistance, rectifier bridge, capacitor, inverter bridge；Wherein, each protective resistance is connected to an input line and the rectification for external power supply
Between one input terminal of bridge；The cathode output end of the rectifier bridge is sequentially connected the positive and described inverter bridge of the capacitor；
The cathode output end of the rectifier bridge is grounded；The cathode of the capacitor is grounded；The capacitor and the inverter bridge and downlink connection.With
This, is in the moment powered on for the first time, regardless of certain in inverter bridge is mutually exported with whether ground wire (the earth) be short-circuit, generated impact electricity
Stream can carry out effective current limliting by protective resistance, preferably protect power module with this, avoid the damage of element.
Detailed description of the invention
It, below will be to use required in embodiment in order to illustrate more clearly of the technical solution of the utility model embodiment
Attached drawing be briefly described, it should be understood that the following drawings illustrates only some embodiments of the utility model, therefore should not be by
Regard the restriction to range as, for those of ordinary skill in the art, without creative efforts, may be used also
To obtain other relevant attached drawings according to these attached drawings.
Fig. 1 is a kind of structural schematic diagram for power circuit with module protection function that the utility model embodiment proposes；
Fig. 2 is a kind of structural schematic diagram for power circuit with module protection function that the utility model embodiment proposes；
Fig. 3 is a kind of structural schematic diagram for power circuit with module protection function that the utility model embodiment proposes；
Fig. 4 is the structure of rectifier bridge in a kind of power circuit with module protection function of the utility model embodiment proposition
Schematic diagram；
Fig. 5 is upper bridge arm IGBT pipe in a kind of power circuit with module protection function of the utility model embodiment proposition
Or the structural schematic diagram of the lower bridge arm IGBT pipe.
Marginal data:
10- protective resistance；1- first resistor；2- second resistance；
3- rectifier bridge；
31- first diode；The second diode of 32-；33- third diode；The 4th diode of 34-；
4- capacitor；
5- inverter bridge； 51-IGBT；The 5th diode of 52-.
Specific embodiment
Hereinafter, the various embodiments of the disclosure will be described more fully.The disclosure can have various embodiments, and
It can adjust and change wherein.It should be understood, however, that: there is no the various embodiments of the disclosure are limited to spy disclosed herein
Determine the intention of embodiment, but the disclosure should be interpreted as in the spirit and scope for covering the various embodiments for falling into the disclosure
All adjustment, equivalent and/or optinal plan.
The term used in the various embodiments of the disclosure is used only for the purpose of describing specific embodiments and not anticipates
In the various embodiments of the limitation disclosure.As used herein, singular is intended to also include plural form, unless context is clear
Chu it is indicated otherwise.Unless otherwise defined, otherwise all terms (including technical terms and scientific terms) used herein have
There is meaning identical with the various normally understood meanings of embodiment one skilled in the art of the disclosure.The term
(term such as limited in the dictionary generally used) is to be interpreted as having and situational meaning in the related technical field
Identical meaning and it will be interpreted as having Utopian meaning or meaning too formal, unless in the various of the disclosure
It is clearly defined in embodiment.
Embodiment
The utility model embodiment discloses a kind of power circuit with module protection function, as shown in Figure 1, Figure 2 and Fig. 3 institute
Show to include: multiple protective resistances 10, rectifier bridge 3, capacitor 4, inverter bridge 5；Wherein,
Each protective resistance 10 is connected between an input line of external power supply and an input terminal of the rectifier bridge 3；
The cathode output end of the rectifier bridge 3 is sequentially connected the positive and described inverter bridge 5 of the capacitor 4；It is described whole
Flow the cathode output end ground connection of bridge 3；
The cathode of the capacitor 4 is grounded；The capacitor 4 and the inverter bridge 5 and downlink connection.
The protective resistance is thermistor in a specific embodiment.
In a specific embodiment, the protective resistance is negative tempperature coefficient thermistor.
Specifically, the protective resistance includes two resistance or three resistance；
With this, when the protective resistance 10 includes first resistor 1 and second resistance 2, the first resistor 1 is connected to outer
It connects between an input line of AC power source and an input terminal of the rectifier bridge 3；The second resistance 2 is connected to the external friendship
Between another input line in galvanic electricity source and another input terminal of the rectifier bridge 3.
Specifically, the structure of power module is as shown in Figure 1, Figure 2 and Fig. 3 shown in, since in external AC power source, (such as its is defeated
What is entered is single-phase voltage, such as two output ends as shown in Figure 3 for 220V) are respectively connected with a resistance, respectively first resistor 1
With second resistance 2, in the case, such as first resistor 1 (such as can be the R1 in Fig. 3) connection is connected on firewire L, and
Second resistance 2 (such as can be the R2 in Fig. 3) is connected on zero curve N.
And under normal conditions, in the main circuit of frequency converter that such as elevator etc. is related to, need by exchanging -- direct current --
The transformation of exchange, AC power source to DC power supply are realized by diode rectification (corresponding rectifier bridge 3) and the filtering of capacitor 4；
Direct current passes through inverter bridge (specifically for example can be three-phase bridge module) Lai Shixian to the transformation of exchange；
With this, even if bus capacitor is bigger, in the moment powered on for the first time, generated dash current is very big, and due to
The setting of first resistor 1 and second resistance 2 can effectively limit dash current.
In addition, although all there is parasitic backward dioded in the three-phase output bridge arm of inverter bridge 5, if wherein certain is mutually exported
Short-circuit with ground wire (the earth), parasitic backward dioded can also constitute a part of rectification circuit on bridge arm, directly to bus capacitor
Charging, but also due to the setting of first resistor 1 and second resistance 2, can carry out current limliting to dash current, avoid the short time
Dash current damage backward dioded, and avoid thus damaging inverter bridge 5.
Specifically, be above come the explanation carried out by taking 2 protective resistances as an example, furthermore or 3 protective resistances, needle
Be three-phase out-put supply to external power supply, and each mutually output is separately connected a protective resistance, and each protective resistance be separately connected it is whole
Bridge is flowed, it can be to be made of 6 diodes in this rectifier bridge, specific connection type is similar to the above.
In a specific embodiment, still by taking above-mentioned protective resistance 10 includes first resistor 1 and second resistance 2 as an example,
In order to carry out current limliting to dash current, the first resistor 1 can use thermistor with the second resistance 2.
Further, in order to reduce power loss as far as possible while protecting circuit, the first resistor 1 and institute thus
Negative tempperature coefficient thermistor can be used by stating second resistance 2.
Specifically, negative temperature coefficient (NTC, Negative Temperature Coefficient) thermistor is with temperature
Degree increases, and resistance can gradually reduce, in this way, not will increase too many power loss, guarantee the normal operation of power module.
In a specific embodiment, as shown in figure 4, when the protective resistance 10 includes first resistor 1 and the second electricity
When hindering 2, the rectifier bridge 3 includes first diode 31, the second diode 32, third diode 33, the 4th diode 34；Its
In,
Anode input connection is provided between the cathode of the first diode 31 and the anode of second diode 32
Point；The anode incoming junction connects the firewire of the external AC power source；
Cathode input connection is provided between the cathode of the third diode 33 and the anode of the 4th diode 34
Point；The cathode incoming junction connects the zero curve of the external AC power source；
The positive tie point connection between the anode of the third diode 33 of the first diode 31 is described negative
Pole output end；
Tie point connection between the cathode of second diode 32 and the cathode of the 4th diode 34 is described just
Pole output end.
Specifically, being for AC power source to be transformed into DC power supply by the setting of rectifier bridge 3.
In a specific embodiment, the capacitor 4 specifically: filter capacitor.
Specifically, carried out by rectifier bridge 3 rectification and capacitor 4 be filtered, realize AC power source to direct current
The conversion in source.
And specifically, as shown in figure 3, the inverter bridge 5 includes: three-phase bridge module.
The three-phase bridge module include: three upper bridge arm IGBT (Insulated Gate Bipolar Transistor,
Insulated gate bipolar transistor) pipe (respectively corresponding the K1 in Fig. 3, K3, K5) and three lower bridge arm IGBT manage and (respectively correspond Fig. 3
In K2, K4, K5)；Wherein, the collector of the upper bridge arm IGBT pipe is all connected with the anode of the capacitor 4
The emitter of the upper bridge arm IGBT pipe is all connected with the collector of the lower bridge arm IGBT pipe, while the upper bridge arm
The emitter of IGBT pipe is used to connect threephase load (such as shown in figure 3, including U phase, V phase, W phase),
The grid of three upper bridge arm IGBT pipes be respectively connected to three phase control signal of bridge arm (such as shown in figure 3, packet
Include UCH, VCH, WCH)；
The grid of three lower bridge arm IGBT pipes be respectively connected to three phase control signal of lower bridge arm (such as shown in figure 3, packet
Include UCL, VCL, WCL)；
The emitter of three lower bridge arm IGBT pipes connects the cathode of the capacitor 4.
More specifically, as shown in figure 3, the upper bridge arm IGBT pipe is consistent with the structure of the lower bridge arm IGBT pipe.
In a specific embodiment, as shown in figure 5, the upper bridge arm IGBT pipe is wrapped with lower bridge arm IGBT pipe
Include the two of IGBT (Insulated Gate BipolarTransistor, insulated gate bipolar transistor) 51 and current stream
Pole pipe 52；
Wherein, the anode of the 5th diode 52 connects the emitter of the IGBT；5th diode 52 is born
Pole connects the collector of the IGBT.
And in a specific embodiment, the 5th diode 52 is specially backward dioded.
Power module as shown in Figure 3 in this programme as a result, it is assumed that the single-phase voltage of external AC power source input, input
Line is respectively firewire L and zero curve N, it is generally the case that a thermistor NTC (R1 in such as Fig. 3) is concatenated on L line.In L, N
In the case where correct wiring, if a certain phase (for example, U phase or V phase or W phase) of three-phase bridge module output is short with ground wire (the earth)
Road (ground wire is connected in distal end with zero curve), when just being powered on this, it is assumed that short-circuit (other feelings of output U phase and ground line (the earth)
Condition is similar, and specific analysis is not carrying out superfluous chat), the current loop for flowing through U phase is as follows:
1, when the voltage output of N line is in positive half-wave, electric current is posted by K1 in ground wire (the earth) → three-phase bridge module
Raw diode → capacitor C1 → rectifier bridge D1 → R1 flows back into L line；
2, when the voltage output of N line is in negative half-wave, electric current passes through L line → R1 → rectifier bridge D1 → capacitor C1 → three-phase
The parasitic diode of K2 → U phase flows back into ground wire (the earth) in bridge module；
It can thus be seen that no matter N line is in positive half-wave or negative half-wave, electric current all have to pass through R1, due to the limit of R1
Stream effect, power module will not all be damaged due to overcurrent.
And based on practical situation, it is also contemplated that the case where L line is with N line wrong can be frequently present of, as a result, for input
Line L, N wrong (the two exchange) in this case, when just having powered on U phase and ground line (the earth) short circuit, are still based on Fig. 3 to be said
Bright, the current loop variation for flowing through U phase is as follows:
1, when the voltage output of N line is in positive half-wave, electric current is posted by K1 in ground wire (the earth) → three-phase bridge module
Raw diode → capacitor C1 → rectifier bridge D1 → R2 flows back into L line；
2, when the voltage output of N line is in positive half-wave, electric current passes through L line → R2 → rectifier bridge D1 → capacitor C1 → three-phase
The parasitic diode of K2 → U phase flows back into ground wire (the earth) in bridge module；
In the case, regardless of N line is in positive half-wave or negative half-wave, electric current all has to pass through R2, as a result, due to R2's
Setting, plays the role of current limliting, effectively protects power module.
No matter L, N line whether there is wrong situation as a result, by respectively connecting on L, N line, a current limliting NTC carries out current limliting,
Even if module output has the phenomenon of short circuit with ground wire (the earth), can not also be damaged with effective protection power module.
With this, the utility model embodiment discloses a kind of power circuit with module protection function, comprising: multiple protections
Resistance 10, rectifier bridge 3, capacitor 4, inverter bridge 5；Wherein, each protective resistance 10 be connected to an input line of external power supply with
Between one input terminal of the rectifier bridge 3；The cathode output end of the rectifier bridge 3 be sequentially connected the capacitor 4 anode and
The inverter bridge 5；The cathode output end of the rectifier bridge 3 is grounded；The cathode of the capacitor 4 is grounded；The capacitor 4 with it is described inverse
Become bridge 5 and downlink connection.With this, in the moment powered on for the first time, it is with ground wire (the earth) regardless of certain in three-phase output bridge is mutually exported
No short circuit, generated dash current can carry out effective current limliting by protective resistance 10, preferably protect power mould with this
Block avoids the damage of element.
It will be appreciated by those skilled in the art that the accompanying drawings are only schematic diagrams of a preferred implementation scenario, module in attached drawing or
Process is not necessarily implemented necessary to the utility model.
It will be appreciated by those skilled in the art that the module in device in implement scene can be described according to implement scene into
Row is distributed in the device of implement scene, can also be carried out corresponding change and is located at the one or more dresses for being different from this implement scene
In setting.The module of above-mentioned implement scene can be merged into a module, can also be further split into multiple submodule.
Above-mentioned the utility model serial number is for illustration only, does not represent the superiority and inferiority of implement scene.
Disclosed above is only several specific implementation scenes of the utility model, and still, the utility model is not limited to
This, the changes that any person skilled in the art can think of should all fall into the protection scope of the utility model.
Claims (10)
1. a kind of power circuit with module protection function characterized by comprising multiple protective resistances, rectifier bridge, capacitor,
Inverter bridge；Wherein,
Each protective resistance is connected between an input line of external power supply and an input terminal of the rectifier bridge；
The cathode output end of the rectifier bridge is sequentially connected the positive and described inverter bridge of the capacitor；The rectifier bridge is born
Pole output end ground connection；
The cathode of the capacitor is grounded；The capacitor and the inverter bridge and downlink connection.
2. a kind of power circuit with module protection function as described in claim 1, which is characterized in that the protective resistance is equal
For thermistor.
3. a kind of power circuit with module protection function as described in claim 1, which is characterized in that the protective resistance is equal
For negative tempperature coefficient thermistor.
4. a kind of power circuit with module protection function as described in claim 1, which is characterized in that the protective resistance packet
Include two resistance or three resistance；
When the protective resistance includes first resistor and second resistance, the first resistor is connected to the one of external AC power source
Between input line and an input terminal of the rectifier bridge；The second resistance is connected to another input of the external AC power source
Between line and another input terminal of the rectifier bridge.
5. a kind of power circuit with module protection function as claimed in claim 4, which is characterized in that when the protective resistance
When including first resistor with second resistance, the rectifier bridge includes first diode, the second diode, third diode, the 4th
Diode；Wherein,
Positive incoming junction is provided between the cathode of the first diode and the anode of second diode；It is described just
Pole incoming junction connects the firewire of the external AC power source；
Cathode incoming junction is provided between the cathode of the third diode and the anode of the 4th diode；It is described negative
Pole incoming junction connects the zero curve of the external AC power source；
The positive tie point between the anode of the third diode of the first diode connects the cathode output end；
Tie point between the cathode of second diode and the cathode of the 4th diode connects the cathode output end.
6. a kind of power circuit with module protection function as described in claim 1, which is characterized in that the capacitor is specific
Are as follows: filter capacitor.
7. a kind of power circuit with module protection function as described in claim 1, which is characterized in that the inverter bridge packet
It includes: three-phase bridge module；
The three-phase bridge module includes: three upper bridge arm IGBT pipes and three lower bridge arm IGBT pipes；Wherein, the upper bridge arm IGBT
The collector of pipe is all connected with the anode of the capacitor；
The emitter of the upper bridge arm IGBT pipe is all connected with the collector of the lower bridge arm IGBT pipe, while the upper bridge arm IGBT
The emitter of pipe is used to connect threephase load,
The grid of three upper bridge arm IGBT pipes is respectively connected to three phase control signal of bridge arm；
The grid of three lower bridge arm IGBT pipes is respectively connected to three phase control signal of lower bridge arm；
The emitter of three lower bridge arm IGBT pipes connects the cathode of the capacitor.
8. a kind of power circuit with module protection function as claimed in claim 7, which is characterized in that the upper bridge arm IGBT
It manages consistent with the structure of the lower bridge arm IGBT pipe.
9. a kind of power circuit with module protection function as claimed in claim 7, which is characterized in that the upper bridge arm IGBT
Pipe includes IGBT and the 5th diode with lower bridge arm IGBT pipe；
Wherein, the anode of the 5th diode connects the emitter of the IGBT；The cathode of 5th diode connects institute
State the collector of IGBT.
10. a kind of power circuit with module protection function as claimed in claim 9, which is characterized in that the five or two pole
Pipe is specially backward dioded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822001362.9U CN209299131U (en) | 2018-11-30 | 2018-11-30 | A kind of power circuit with module protection function |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822001362.9U CN209299131U (en) | 2018-11-30 | 2018-11-30 | A kind of power circuit with module protection function |
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| CN209299131U true CN209299131U (en) | 2019-08-23 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI703806B (en) * | 2019-10-14 | 2020-09-01 | 台達電子工業股份有限公司 | Active bridge rectifier circuit |
| CN112865507A (en) * | 2019-11-28 | 2021-05-28 | 广东美的制冷设备有限公司 | Power grid impact prevention device and air conditioner |
-
2018
- 2018-11-30 CN CN201822001362.9U patent/CN209299131U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI703806B (en) * | 2019-10-14 | 2020-09-01 | 台達電子工業股份有限公司 | Active bridge rectifier circuit |
| CN112865507A (en) * | 2019-11-28 | 2021-05-28 | 广东美的制冷设备有限公司 | Power grid impact prevention device and air conditioner |
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