CN211405853U - Bus overvoltage protection circuit and four-quadrant frequency converter - Google Patents
Bus overvoltage protection circuit and four-quadrant frequency converter Download PDFInfo
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- CN211405853U CN211405853U CN201922379371.6U CN201922379371U CN211405853U CN 211405853 U CN211405853 U CN 211405853U CN 201922379371 U CN201922379371 U CN 201922379371U CN 211405853 U CN211405853 U CN 211405853U
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Abstract
The utility model relates to a circuit protection field discloses a generating line overvoltage crowbar, four-quadrant converter. The utility model discloses in, include: a bus bar; the first capacitor module is connected to the bus and used for storing electric energy of the bus; the voltage release module is connected to the first capacitor module; the voltage release module is used for releasing the electric energy stored by the first capacitor module when the bus voltage exceeds a preset threshold value. When the bus voltage exceeds the preset threshold, the voltage release module can release the electric energy stored in the first capacitor module, so that the risk that the bus voltage exceeds the set threshold and devices on the bus are damaged is avoided. Compared with the prior art that the requirement for reducing the peak voltage value of the bus is met as far as possible by arranging the large-capacity capacitor module, the large cost consumed by the large-capacity capacitor module can be greatly reduced.
Description
Technical Field
The utility model relates to a circuit protection field, in particular to generating line overvoltage crowbar, four-quadrant converter.
Background
At present, because a bus is a shared passage in which a plurality of circuits are connected in a parallel branch form, the voltage on the bus is high, when the bus voltage continuously rises due to a fault in the circuit, peak voltage can be generated in the bus, other devices and modules in the circuit are damaged, and the performance and even the function of the circuit are affected. Therefore, in order to solve the problem of the peak voltage in the prior art, a plurality of capacitors are added in the bus to increase the capacitance of the bus capacitor, so as to store the energy fed back to the bus when the motor brakes and shakes, thereby reducing the peak voltage value of the bus.
The inventor finds that at least the following problems exist in the prior art: in order to solve the problem of peak voltage, the prior art needs a larger bus capacitor, increases the manufacturing cost of the frequency converter, and increases the volume of the frequency converter.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a generating line overvoltage crowbar, four-quadrant converter for reduce the cost of avoiding producing peak voltage in the generating line.
In order to solve the above technical problem, an embodiment of the present invention provides a bus overvoltage protection circuit, including: a bus bar; the first capacitor module is connected to the bus and used for storing electric energy of the bus; the voltage release module is connected to the first capacitor module; the voltage release module is used for releasing the electric energy stored by the first capacitor module when the bus voltage exceeds a preset threshold value. The utility model discloses an embodiment still provides a four-quadrant converter, including foretell generating line overvoltage crowbar.
Compared with the prior art, when the bus voltage exceeds a preset threshold value, the voltage release module starts to work to release the electric energy stored in the first capacitor module, so that the risk that the bus voltage exceeds the set threshold value and devices on the bus are damaged is avoided; compared with the prior art that the requirement for reducing the peak voltage value of the bus is met as far as possible by arranging the large-capacity capacitor module, the large cost consumed by the large-capacity capacitor module can be greatly reduced.
In addition, the bus comprises an anode bus and a cathode bus, the anode of the first capacitor module is connected with the anode bus, the cathode of the first capacitor module is connected with the cathode bus, the anode and the cathode of the first capacitor module are respectively provided with a connecting node, and the voltage release module is connected with the connecting nodes of the anode and the cathode of the first capacitor module. Through the connection mode, when the voltage release module is in an abnormal condition, the voltage release module can release the electric quantity of the first capacitor module, and the first capacitor module can continue to store the electric energy on the bus to protect other devices on the bus.
In addition, the bus overvoltage protection circuit also comprises a diode; the diode is positioned between the positive bus and the positive connecting node of the first capacitor module, the anode of the diode is connected with the positive bus, and the cathode of the diode is connected with the positive connecting node of the first capacitor module. Through setting up a diode, utilize the characteristic of diode one-way conduction for the electric energy of first capacitor module only storage generating line can not be to generating line release electric energy, avoids the electric energy of first capacitor module to flow against the current, thereby has reduced the ripple electric current on the first capacitor module, has improved the life-span.
In addition, the bus overvoltage protection circuit also comprises a first resistor; the first resistor is connected in series with the diode. Through setting up the first resistance of establishing ties with the diode, can restrict the electric current that flows into first capacitor module, can reduce the charging current that flows into first capacitor module, play the protection of going up electric charge.
In addition, the voltage release module includes a first voltage dependent resistor. Through setting up first piezo-resistor, when busbar voltage exceeded when predetermineeing the threshold value for the voltage at piezo-resistor both ends surpassed first piezo-resistor operating voltage, and first piezo-resistor's resistance diminishes, and the energy on the first capacitor module consumes on first piezo-resistor, thereby reduces busbar peak voltage value.
In addition, the voltage release module further comprises a second resistor, and the second resistor is connected with the first voltage dependent resistor in series. Through setting up the second resistor for when first piezo-resistor resistance reduces, consume the electric energy of first capacitor module through the second resistor dispersion, improve the ability that generating line overvoltage protection circuit consumed the electric energy, reduce the pressure that first piezo-resistor consumed the electric energy, improve first piezo-resistor's life-span.
In addition, the voltage release module further comprises a second piezoresistor, the working voltage of the second piezoresistor is the same as that of the first piezoresistor, and the second piezoresistor is connected with the first piezoresistor in parallel. Through setting up the second piezo-resistor, when voltage exceeded first piezo-resistor operating voltage, through the electric energy of the first capacitor module of second piezo-resistor dispersion consumption, improved the consumption speed of electric energy, can make the electric energy that the capacitor module is first can in time be consumed, avoid peak voltage, simultaneously, also improved first piezo-resistor's life.
Drawings
Fig. 1 is a schematic circuit diagram of a bus overvoltage protection circuit according to a first embodiment of the present invention;
fig. 2 is a schematic circuit diagram of a bus overvoltage protection circuit according to a second embodiment of the present invention;
fig. 3 is a schematic circuit diagram of a bus overvoltage protection circuit according to a second embodiment of the present invention;
fig. 4 is a schematic circuit diagram of a four-quadrant converter according to a third embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the following will explain in detail each embodiment of the present invention with reference to the accompanying drawings. However, it will be appreciated by those of ordinary skill in the art that in various embodiments of the invention, numerous technical details are set forth in order to provide a better understanding of the present application. However, the technical solutions claimed in the claims of the present application can be implemented without these technical details and with various changes and modifications based on the following embodiments.
The utility model discloses a first embodiment relates to a generating line overvoltage crowbar, include: a bus bar; the first capacitor module is connected to the bus and used for storing electric energy of the bus; the voltage release module is connected to the first capacitor module; the voltage release module is used for releasing the electric energy stored by the first capacitor module when the bus voltage exceeds a preset threshold value. As shown in fig. 1.
The bus comprises an anode bus and a cathode bus, as shown in fig. 1, a circuit ab section represents the anode bus, a circuit cd section represents the cathode bus, the anode of the first capacitor module 101 is connected with the anode bus ab through a DC + node, the cathode of the first capacitor module 101 is connected with the cathode bus cd through a DC-node, the anode and the cathode of the first capacitor module respectively have a connection node e and a connection node f, and the voltage release module 102 is connected with the connection nodes e and f of the anode and the cathode of the first capacitor module 101.
In the embodiment, when the bus voltage exceeds the preset threshold, the voltage release module can release the electric energy stored in the first capacitor module, so that the risk that the bus voltage exceeds the set threshold and devices on the bus are damaged is avoided; compared with the prior art that the requirement for reducing the peak voltage value of the bus is met as far as possible by arranging the large-capacity capacitor module, the large cost consumed by the large-capacity capacitor module can be greatly reduced.
The utility model discloses a second embodiment relates to a generating line overvoltage crowbar. The second embodiment is substantially the same as the first embodiment, and mainly differs therefrom in that: in a second embodiment of the present invention, the voltage release module comprises a first voltage dependent resistor.
Fig. 2 and 3 are circuit configuration diagrams of a bus overvoltage protection circuit according to this embodiment.
In this embodiment, the first capacitor module includes a first capacitor C1, and the voltage release module includes a first voltage dependent resistor RV 1. In other embodiments, the first capacitive module may comprise a plurality of capacitors.
Specifically, when the voltage value at the two ends of the first voltage dependent resistor RV1 is smaller than the working voltage of the first voltage dependent resistor, the resistance of the first voltage dependent resistor RV1 is larger, and at this time, only a very small amount of electric energy of the first capacitor module 101 can be consumed; when the voltage value exceeds the working voltage of the first piezoresistor RV1, the resistance value of the first piezoresistor RV1 is rapidly reduced, the voltage value of the first capacitor C1 is unchanged, under the condition that the voltage value is unchanged, the power consumption is in inverse proportion to the resistance value, the smaller the resistance is, the higher the speed of the first piezoresistor RV1 consuming the first capacitor C1 is, so that when the peak voltage appears on the bus, the electric energy on the bus can be stored by the first capacitor module, the peak voltage of the bus is reduced, the capacity of the first capacitor module does not need to be too large, and the cost of the capacitor module is reduced.
However, if the voltage releasing module releases the electric energy of the first capacitor C1 only through the first voltage dependent resistor RV1, the first voltage dependent resistor may not consume the electric energy of the first capacitor module, and the service life of the first voltage dependent resistor RV1 may also be reduced. Therefore, in an example, as shown in fig. 2, in order to solve the problem that the first voltage dependent resistor cannot consume the power of the first capacitor module and improve the service life of the first voltage dependent resistor, a second resistor R2 connected in series with the first voltage dependent resistor RV1 is arranged in the voltage release module, and the power of the first capacitor C1 is dispersedly consumed through the second resistor R2, so that the power of the first capacitor module can be consumed in time, the power consumption capability of the bus overvoltage protection circuit is improved, the service life of the first voltage dependent resistor is prolonged, and the service life of the whole circuit is prolonged. In another example, as shown in fig. 3, in order to improve the service life of the first varistor RV1, a second varistor RV2 is disposed in the voltage release module, the second varistor RV2 has the same operating voltage as the first varistor RV1, and the second varistor RV2 is connected in parallel with the first varistor RV 1.
In one example, the bus overvoltage protection circuit further comprises a diode D1, the diode D1 is located between the anode bus ab and the connection node e of the anode of the first capacitor C1, the anode of the diode D1 is connected to the anode bus ab, and the cathode of the diode D1 is connected to the connection node e of the anode of the first capacitor module C1. Because the diode D1 has the characteristic of one-way conduction, the first capacitor C1 only stores the electric energy in the bus, the electric energy can not be released to the bus, the electric energy reverse flow of the first capacitor C1 is avoided, the ripple current on the first capacitor module is reduced, and the service life is prolonged.
In one example, since the ripple current of the first capacitor C1 is low, the first capacitor C1 can be selected to have a low ripple current capability and a high capacity aluminum electrolytic capacitor, thereby reducing the volume of the whole circuit.
In one example, the bus overvoltage protection circuit further comprises a first resistor R1, and the first resistor R1 is connected in series with the diode D1. Specifically, in this embodiment, the first resistor R1 is located between the DC + node and the anode of the diode D1, and the current in the bus first flows through the first resistor R1, then through the diode D1 and into the first capacitor C1. In other embodiments, the first resistor R1 may be located between the cathode of the diode D1 and the connection node e of the anode of the first capacitor C1, and the current in the bus first passes through the diode D1 and then flows into the first capacitor C1 through the first resistor R1.
This embodiment is through setting up first piezo-resistor at voltage release module for when busbar voltage surpassed preset threshold value, first piezo-resistor resistance reduces, and correspondingly, the speed of consuming the electric energy accelerates, thereby reduces busbar peak voltage value.
The utility model discloses a third embodiment relates to a four-quadrant converter, including foretell generating line overvoltage crowbar. Fig. 4 shows a circuit configuration diagram of the four-quadrant inverter according to the present embodiment.
In one example, the four-quadrant frequency converter further comprises: a rectification module 301 and an inversion module 302; the rectifying module 301 is connected with the inverting module 302 through a bus, and the rectifying module 301 is used for converting alternating current of an external three-phase power grid into direct current and providing electric energy for the inverting module 301; the inverter module 302 is used for driving an external motor and feeding back electric energy generated by braking the external motor to the bus; the rectifying module is also used for feeding the electric energy fed back to the bus back to an external three-phase power grid.
In one example, the four-quadrant frequency converter further comprises a second capacitor module, the second capacitor module comprises a second capacitor C2, the anode of the second capacitor C2 is connected with the anode bus ab, and the cathode of the second capacitor C2 is connected with the cathode bus cd. In other examples, the second capacitive module may include a plurality of capacitors. The second capacitor C2 is used as bus storage filtering. When the four-quadrant frequency converter works, the rectification module and the inversion module charge and discharge the second capacitor module according to different operation conditions. Therefore, the second capacitor C2 selects a film capacitor with high ripple current capability, and the life of the film capacitor is longer, thereby improving the life of the four-quadrant frequency converter.
In one example, the rectifying module 301 includes three parallel rectifying branches, each rectifying branch includes two serially connected switching devices 3011, a connection node R, S, T exists between the two switching devices 3011 in each rectifying branch, and an external three-phase power grid is connected to connection nodes R, S, T of the three rectifying branches respectively; the inverter module 302 includes three inverter branches connected in parallel, each inverter branch includes two serially connected switching devices 3011, a connection node U, V, W exists between two switching devices 3011 in each inverter branch, and the external motor is connected to the connection nodes U, V, W of the three inverter branches respectively.
In one example, the switching device 3011 includes a switching Transistor and a diode connected in parallel with the switching Transistor, and the switching Transistor includes an Insulated Gate Bipolar Transistor (IGBT) or a Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET).
According to the four-quadrant frequency converter of the embodiment, through the bus protection circuit, the peak voltage value of the bus can be reliably reduced, meanwhile, the voltage value of the bus is prevented from exceeding the withstand voltage value of the components on the bus, and the manufacturing cost and the size of the four-quadrant frequency converter are reduced.
It will be understood by those skilled in the art that the foregoing embodiments are specific examples of the invention, and that various changes in form and details may be made therein without departing from the spirit and scope of the invention in its practical application.
Claims (10)
1. A bus overvoltage protection circuit, comprising:
a bus bar;
the first capacitor module is connected to the bus and used for storing electric energy of the bus;
the voltage release module is connected to the first capacitor module; the voltage release module is used for releasing the electric energy stored by the first capacitor module when the bus voltage exceeds a preset threshold value.
2. The bus overvoltage protection circuit according to claim 1, wherein the bus comprises a positive bus and a negative bus, the positive electrode of the first capacitor module is connected to the positive bus, the negative electrode of the first capacitor module is connected to the negative bus, the positive electrode and the negative electrode of the first capacitor module respectively have a connection node, and the voltage release module is connected to the connection nodes of the positive electrode and the negative electrode of the first capacitor module.
3. The bus overvoltage protection circuit of claim 2, wherein the bus overvoltage protection circuit further comprises a diode;
the diode is positioned between the positive bus and the positive connecting node of the first capacitor module, the anode of the diode is connected with the positive bus, and the cathode of the diode is connected with the positive connecting node of the first capacitor module.
4. The bus overvoltage protection circuit according to claim 3, wherein the bus overvoltage protection circuit further comprises a first resistor;
the first resistor is connected in series with the diode.
5. The bus overvoltage protection circuit according to any one of claims 1 to 4, wherein the voltage release module comprises a first varistor.
6. The bus overvoltage protection circuit of claim 5, said voltage release module further comprising a second resistor connected in series with said first varistor.
7. The bus overvoltage protection circuit of claim 5, wherein the voltage release module further comprises a second varistor, the second varistor having a same operating voltage as the first varistor, the second varistor being connected in parallel with the first varistor.
8. A four-quadrant frequency converter comprising the bus overvoltage protection circuit of any one of claims 1 to 7.
9. The four-quadrant frequency converter according to claim 8, further comprising: the rectifier module and the inverter module;
the rectification module is connected with the inversion module through the bus, and is used for converting alternating current of an external three-phase power grid into direct current and providing electric energy for the inversion module;
the inverter module is used for driving an external motor and feeding back electric energy generated when the external motor brakes to the bus;
the rectifying module is also used for feeding the electric energy fed back to the bus back to the external three-phase power grid.
10. The four-quadrant frequency converter according to claim 8, further comprising: a second capacitive module;
the positive electrode of the second capacitor module is connected with the positive electrode bus, and the negative electrode of the second capacitor module is connected with the negative electrode bus.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922379371.6U CN211405853U (en) | 2019-12-24 | 2019-12-24 | Bus overvoltage protection circuit and four-quadrant frequency converter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922379371.6U CN211405853U (en) | 2019-12-24 | 2019-12-24 | Bus overvoltage protection circuit and four-quadrant frequency converter |
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| CN211405853U true CN211405853U (en) | 2020-09-01 |
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| CN201922379371.6U Active CN211405853U (en) | 2019-12-24 | 2019-12-24 | Bus overvoltage protection circuit and four-quadrant frequency converter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116032105A (en) * | 2023-03-24 | 2023-04-28 | 深圳市南方硅谷半导体股份有限公司 | Power supply overvoltage protection IC |
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2019
- 2019-12-24 CN CN201922379371.6U patent/CN211405853U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116032105A (en) * | 2023-03-24 | 2023-04-28 | 深圳市南方硅谷半导体股份有限公司 | Power supply overvoltage protection IC |
| CN116032105B (en) * | 2023-03-24 | 2023-06-16 | 深圳市南方硅谷半导体股份有限公司 | Power supply overvoltage protection IC |
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