CN217406423U - Three-phase power supply circuit - Google Patents
Three-phase power supply circuit Download PDFInfo
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- CN217406423U CN217406423U CN202221251381.7U CN202221251381U CN217406423U CN 217406423 U CN217406423 U CN 217406423U CN 202221251381 U CN202221251381 U CN 202221251381U CN 217406423 U CN217406423 U CN 217406423U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- 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
Abstract
The application discloses three-phase power supply circuit includes: the three-phase alternating current input end of the power supply rectification module is connected with a three-phase power supply, and the positive and negative direct current output ends are connected with a first capacitor and a second capacitor which are mutually connected in series in parallel; two ends of the first capacitor are connected with a first voltage-sharing resistor, a first sampling resistor and a first voltage-sharing resistor in parallel after being connected in series; two ends of the second capacitor are connected with a second voltage-sharing resistor in parallel; the equivalent resistance values of the parallel resistors at the two ends of the first capacitor and the second capacitor are equal; the control module controls the power supply rectifying module based on the voltage of the sampling resistor, so that the voltages at two ends of the two capacitors are equal. Therefore, the equivalent resistance values at the two ends of the first capacitor and the second capacitor of the three-phase power circuit are configured to be equal, so that the function of voltage sharing of the resistors is realized; through setting up sampling resistor, according to sampling resistor's voltage control power rectifier module, realize the first electric capacity of dynamic equilibrium and second electric capacity both ends voltage at the circuit operation in-process, be favorable to the average partial pressure control of series connection electric capacity to avoid the excessive pressure of electric capacity to damage, improve circuit reliability.
Description
Technical Field
The invention relates to the electronic circuit technology, in particular to a three-phase power supply circuit.
Background
The existing three-phase power supply circuit has higher output direct-current voltage, and the working voltage at two ends of a single capacitor is reduced by adopting a capacitor series connection mode. The leakage currents of the two capacitors connected in series up and down are different, which may cause uneven voltage division on the two capacitors, possibly causing the working voltage at two ends of one capacitor to exceed the rated withstand voltage of the capacitor, and further causing overvoltage damage to the capacitor.
In order to avoid the condition of uneven voltage division of the capacitors, the series-connected voltage-sharing resistors are usually added behind the series-connected capacitors, the upper and lower groups of voltage-sharing resistors are respectively connected with the upper and lower capacitors in parallel, and the voltage division of the two capacitors is ensured to be equal by enabling the resistance values of the two groups of voltage-sharing resistors to be equal. However, if there is a load mounted on the half bus at the rear end of the three-phase rectification circuit, the load is located on the half bus, which results in more energy consumed on a capacitor connected in parallel with the load, and the voltage at the two ends is lower, which may eventually result in overvoltage damage of another capacitor.
Disclosure of Invention
To solve the above technical problem, embodiments of the present application desirably provide a three-phase power circuit.
The technical scheme of the application is realized as follows:
the three-phase power supply circuit includes:
the three-phase power supply circuit includes: the system comprises a three-phase power supply, a power supply rectifying module, a first capacitor, a second capacitor, a voltage-sharing module, a half bus load and a full bus load; the three-phase alternating current input end of the power supply rectifying module is connected with the three-phase power supply, and the positive and negative direct current output ends are connected with the first capacitor and the second capacitor which are connected in series with each other and the full bus load; two ends of the first capacitor are connected with the half bus load in parallel;
the voltage-sharing module comprises: the voltage-sharing circuit comprises a first voltage-sharing resistor, a second voltage-sharing resistor, a first sampling resistor and a first voltage-sharing resistor;
two ends of the first capacitor are connected with the first voltage-sharing resistor in parallel; the two ends of the second capacitor are connected with the second voltage-sharing resistor in parallel; the first sampling resistor and the first voltage dividing resistor are connected in series and then connected in parallel at two ends of the first capacitor; the first equivalent resistance value of the parallel resistor at the two ends of the first capacitor is equal to the second equivalent resistance value of the parallel resistor at the two ends of the second capacitor;
the three-phase power supply circuit further comprises a control module, wherein the control module is used for acquiring first sampling voltage at two ends of the first sampling resistor and controlling the working state of a switch tube group in the power supply rectifying module based on the first sampling voltage, so that voltages at two ends of the first capacitor and the second capacitor are equal.
In the above scheme, the voltage equalizing module further includes: and the third voltage-sharing resistor is connected in parallel at two ends of the second capacitor.
In the above scheme, the third voltage-sharing resistor is formed by connecting one or more resistors in series, or the third voltage-sharing resistor is formed by connecting one or more resistors in parallel.
In the above scheme, the voltage equalizing module further includes: the second sampling resistor and the second voltage-dividing resistor are connected in series and then connected in parallel at two ends of the second capacitor; the control module is further configured to obtain a second sampling voltage across the second sampling resistor, and control a working state of a switch tube group in the power supply rectification module based on the first sampling voltage and the second sampling voltage, so that voltages across the first capacitor and the second capacitor are equal.
In the foregoing solution, the control module is configured to determine a first voltage across the first capacitor based on the first sampling voltage; determining a second voltage across the second capacitor based on the second sampled voltage; when the voltage difference between the first voltage and the second voltage is in a first preset range, controlling the working state of a switch tube group in the power supply rectification module so as to enable the charging speed of the first capacitor to be smaller than that of the second capacitor; and when the voltage difference between the first voltage and the second voltage is within a second preset range, controlling the working state of a switch tube group in the power supply rectification module so as to enable the charging speed of the first capacitor to be greater than that of the second capacitor.
In the above scheme, the voltage equalizing module further includes: the third sampling resistor and the third voltage dividing resistor are connected in series and then connected in parallel at two ends of the half bus load; the control module is used for acquiring a third sampling voltage at two ends of the third sampling resistor; and controlling the working state of a switch tube group in the power supply rectifying module based on the first sampling voltage, and controlling the working parameters of the half-bus load based on the third sampling voltage so that the voltages at two ends of the first capacitor and the second capacitor are equal.
In the above scheme, the first capacitor is formed by one or more capacitors connected in series, or the first capacitor is formed by one or more capacitors connected in parallel; the second capacitor is formed by one or more capacitors connected in series, or the second capacitor is formed by one or more capacitors connected in parallel.
In the above scheme, the first voltage-sharing resistor is formed by one or more resistors connected in series, or the first voltage-sharing resistor is formed by one or more resistors connected in parallel; the second voltage-sharing resistor is formed by connecting one or more resistors in series, or the second voltage-sharing resistor is formed by connecting one or more resistors in parallel.
In the foregoing solution, the control module is configured to determine a first voltage across the first capacitor based on the first sampling voltage; acquiring full bus voltage of the three-phase power supply circuit; and controlling the power supply rectifying module based on the first voltage and the full bus voltage to enable the voltages at two ends of the first capacitor and the second capacitor to be equal.
In the foregoing solution, the control module is configured to determine a second voltage across the second capacitor based on the first voltage and the full bus voltage; when the voltage difference between the first voltage and the second voltage is in a first preset range, controlling the working state of a switch tube group in the power supply rectification module so as to enable the charging speed of the first capacitor to be smaller than that of the second capacitor; and when the voltage difference between the first voltage and the second voltage is in a second preset range, controlling the working state of a switch tube group in the power supply rectification module so as to enable the charging speed of the first capacitor to be greater than that of the second capacitor.
The application discloses a three-phase power circuit, which realizes a resistance voltage-sharing function by configuring that equivalent resistance values at two ends of a first capacitor and a second capacitor of the three-phase power circuit are equal; through setting up sampling resistor and divider resistance, according to sampling resistor's voltage control power rectifier module, realize the first electric capacity of dynamic equilibrium and second electric capacity both ends voltage at the circuit operation in-process, be favorable to the average partial pressure control of series connection electric capacity to avoid the overvoltage of electric capacity to damage, improve circuit reliability.
Drawings
FIG. 1 is a first topology of a three-phase power circuit in an embodiment of the present application;
FIG. 2 is a second topology of a three-phase power circuit in an embodiment of the present application;
FIG. 3 is a third topology of a three-phase power circuit according to an embodiment of the present application;
FIG. 4 is a fourth topology of a three-phase power circuit in an embodiment of the present application;
fig. 5 is a fifth topology diagram of a three-phase power supply circuit in the embodiment of the present application.
Detailed Description
So that the manner in which the features and elements of the present embodiments can be understood in detail, a more particular description of the embodiments, briefly summarized above, may be had by reference to embodiments, some of which are illustrated in the appended drawings.
Fig. 1 is a first topology diagram of a three-phase power circuit in an embodiment of the present application, and as shown in fig. 1, the three-phase power circuit may specifically include:
the system comprises a three-phase power supply 10, a power supply rectifying module 11, a voltage-sharing module, a first capacitor 12, a second capacitor 13, a half bus load and a full bus load; the three-phase alternating current input end of the power supply rectifying module 11 is connected with the three-phase power supply 10, and the positive and negative direct current output ends are connected with the first capacitor 12 and the second capacitor 13 which are connected in series with each other, and the full-bus load; the two ends of the first capacitor 12 are connected with the half bus load in parallel;
the voltage-sharing module comprises: the voltage-sharing circuit comprises a first voltage-sharing resistor R1, a second voltage-sharing resistor R2, a first sampling resistor R '1 and a first voltage-sharing resistor R' 1;
the two ends of the first capacitor 12 are connected with the first voltage-sharing resistor R1 in parallel; the two ends of the second capacitor 13 are connected with the second voltage-sharing resistor R2 in parallel; the first sampling resistor R '1 and the first voltage dividing resistor R' 1 are connected in series and then connected in parallel at two ends of the first capacitor 12; wherein, a first equivalent resistance value of the parallel resistor at two ends of the first capacitor 12 is equal to a second equivalent resistance value of the parallel resistor at two ends of the second capacitor 13;
the three-phase power circuit further comprises a control module, wherein the control module is used for acquiring first sampling voltage at two ends of the first sampling resistor and controlling the working state of a switch tube group in the power rectifying module based on the first sampling voltage, so that the voltages at two ends of the first capacitor 12 and the second capacitor 13 are equal.
In the embodiment of fig. 1, the power rectification module 11 includes: a three-phase rectifier bridge and a bidirectional switch assembly; the three-phase rectifier bridge comprises a first bridge arm, a second bridge arm and a third bridge arm which are connected in parallel; the bidirectional switch assembly comprises a first bidirectional switch, a second bidirectional switch and a third bidirectional switch, one end of the first bidirectional switch is connected with the midpoint of the third bridge arm, one end of the second bidirectional switch is connected with the midpoint of the second bridge arm, and one end of the third bidirectional switch is connected with the midpoint of the first bridge arm; the other end of the first bidirectional switch, the other end of the second bidirectional switch, and the other end of the third bidirectional switch are all connected to a common terminal between the first capacitor 12 and the second capacitor 13. The charging and discharging operations of the inductor are realized by controlling the on-off of each path of bidirectional switch in the bidirectional switch assembly.
The first bridge arm comprises a first diode D1 and a second diode D2, the second bridge arm comprises a third diode D3 and a fourth diode D4, and the third bridge arm comprises a fifth diode D5 and a sixth diode D6.
The first bidirectional switch, the second bidirectional switch and the third bidirectional switch in the bidirectional switch assembly can comprise two power switch tubes which are connected in series in an opposite direction, and the two power switch tubes are connected with diodes in parallel in the opposite direction. Illustratively, the first bidirectional switch includes a first IGBT module T1 and a second IGBT module T2, the second bidirectional switch includes a third IGBT module T3 and a fourth IGBT module T4, and the third bidirectional switch includes a fifth IGBT module T5 and a sixth IGBT module T6. It should be noted that, in the present application, the number and the structure of the diode group and the switch group are not specifically limited, and may be adjusted according to actual requirements.
The positive and negative direct current output ends specifically comprise a positive bus end and a negative bus end, and the positive bus end is connected to the negative bus end sequentially through the second capacitor 13 and the first capacitor 12.
It should be noted that, in the embodiment of the present application, the full bus refers to a positive bus and a negative bus (between point P and point N in fig. 1) of the two-stage electrolytic capacitors connected in series in the high-voltage dc bus filter circuit using the two-stage electrolytic capacitors connected in series, and the half bus refers to an upper half bus between a midpoint (point O in fig. 1) of the two-stage electrolytic capacitors connected in series and the positive bus (point P in fig. 1), a lower half bus between the midpoint of the two-stage capacitors connected in series and the negative bus (point N in fig. 1), and both the upper half bus and the lower half bus are half buses. Illustratively, an upper half bus is arranged between the middle point of the series connection of the first capacitor 12 and the second capacitor 13 and the positive bus end, and a lower half bus is arranged between the middle point of the series connection of the first capacitor 12 and the second capacitor 13 and the negative bus end.
It should be noted that, in fig. 1, the first capacitor 12 is a lower bus capacitor, the half bus load is a lower bus load, and the second capacitor 13 is an upper bus capacitor, but fig. 1 is not used to limit the connection position of the capacitors in this application, the first capacitor 12 may also be connected to the upper bus as the upper bus capacitor, and the second capacitor 13 may also be connected to the lower bus as the lower bus capacitor in this embodiment, that is, the positive bus terminal is connected to the negative bus terminal sequentially through the first capacitor 12 and the second capacitor 13.
For example, in practical applications, the half-bus load and the full-bus load may be fans, compressors, and the like, and are connected to the half-bus or the full-bus through the inverter module.
Here, the voltage equalizing module is used to equalize the voltage across the first capacitor 12 and the second capacitor 13. In the embodiment of fig. 1, the voltage equalizing module of the three-phase power circuit includes: the voltage-sharing circuit comprises a first voltage-sharing resistor R1, a second voltage-sharing resistor R2, a first sampling resistor R '1 and a first voltage-sharing resistor R' 1.
Here, the first voltage equalizing resistor and the second voltage equalizing resistor are used to equalize the parallel-connected resistances across the first capacitor 12 and the second capacitor 13.
In the embodiment shown in fig. 1, the first equivalent resistance of the parallel resistor across the first capacitor 12 is equal to the second equivalent resistance of the parallel resistor across the second capacitor 13, which is equivalent to R1// (R' 1+ R "1) ═ R2. For example, in practical applications, if R2 is equal to R' 1+ R "1, the first voltage-sharing resistance is 0, that is, the first voltage-sharing resistance may not exist.
It should be noted that the first voltage-sharing resistor, the second voltage-sharing resistor, and the first voltage-sharing resistor may be a single resistor, or may be a resistor network formed by a plurality of resistors, and the number of the voltage-sharing resistors may be flexibly adjusted according to the resistor type selection and the power derating condition. The voltage equalizing module is not limited to the structure in the application, and can be other structures with the same principle.
For example, in some embodiments, the first voltage equalizing resistor is formed by connecting one or more resistors in series, or the first voltage equalizing resistor is formed by connecting one or more resistors in parallel; the second voltage-sharing resistor is formed by connecting one or more resistors in series, or the second voltage-sharing resistor is formed by connecting one or more resistors in parallel.
Illustratively, in some embodiments, the first voltage-dividing resistor is formed by one or more resistors connected in series, or the first voltage-dividing resistor is formed by one or more resistors connected in parallel.
Here, the first sampling resistor R' 1 is configured to collect a voltage across itself (i.e., a first sampling voltage) and output the voltage to the control module, so that the control module controls an operating state of a switch tube group in the power supply rectifying module based on the first sampling voltage, so that voltages across the first capacitor 12 and the second capacitor 13 are equal.
For example, in some embodiments, the controlling the operating state of the switch tube group in the power supply rectification module based on the first sampling voltage so that the voltages across the first capacitor and the second capacitor are equal includes: determining a first voltage across the first capacitor based on the first sampled voltage; acquiring full bus voltage of the three-phase power supply circuit; and controlling the power supply rectifying module based on the first voltage and the full bus voltage to enable the voltages at two ends of the first capacitor and the second capacitor to be equal.
Here, the first voltage across the first capacitor is determined based on the first sampling voltage, specifically, the first voltage across the first capacitor is determined according to a ratio of a first sampling resistor and a first voltage dividing resistor, and the first sampling resistor.
For example, in some embodiments, said controlling said power rectification module based on said first voltage and said full bus voltage comprises: determining a second voltage across the second capacitor based on the first voltage and the full bus voltage; when the voltage difference between the first voltage and the second voltage is in a first preset range, controlling the working state of a switch tube group in the power supply rectification module so as to enable the charging speed of the first capacitor to be smaller than that of the second capacitor; and when the voltage difference between the first voltage and the second voltage is in a second preset range, controlling the working state of a switch tube group in the power supply rectification module so as to enable the charging speed of the first capacitor to be greater than that of the second capacitor.
By controlling the working state of the switch tube group in the power supply rectifying module, the charging speed of the first capacitor is higher than that of the second capacitor, so that the voltage adjustment at the two ends of the first capacitor and the second capacitor can be realized, the voltages at the two ends of the first capacitor and the second capacitor are equal, the voltage-sharing effect is achieved, and the overvoltage damage of the capacitors is avoided.
According to the three-phase power supply conversion circuit, the equivalent resistance values of the two ends of the first capacitor and the second capacitor of the three-phase power supply circuit are configured to be equal, so that the function of resistance voltage sharing is achieved; by setting the sampling resistor, the power supply rectification module is controlled according to the voltage of the sampling resistor, and the voltage at two ends of the first capacitor and the voltage at two ends of the second capacitor are dynamically balanced in the circuit operation process. A circuit compromises two kinds of functions, has simplified the circuit design on the one hand, has saved the quantity of components and parts, and on the other hand has improved the voltage-sharing precision, is favorable to the average partial pressure control of series capacitance to avoid the overvoltage of electric capacity to damage, improve the circuit reliability.
Here, since the voltage across the first capacitor 12 is too large and exceeds the sampling threshold of the sampling resistor, the voltage across the first capacitor 12 is determined by connecting the first sampling resistor in series with the first voltage dividing resistor.
Here, the first capacitor 12 may be an upper bus capacitor of the three-phase power supply circuit, or may be a lower bus capacitor of the three-phase power supply circuit. The first sampling resistor and the first divider resistor are connected in series and then connected in parallel at two ends of the upper bus capacitor, and are used for collecting voltages at two ends of the upper bus capacitor; when the first sampling resistor and the first voltage dividing resistor are connected in series and then connected in parallel at two ends of the lower bus capacitor, the first sampling resistor and the first voltage dividing resistor are used for collecting voltages at two ends of the lower bus capacitor.
For example, in some embodiments, the voltage equalizing module further comprises: and the third voltage-sharing resistor is connected in parallel at two ends of the second capacitor.
For example, in some embodiments, the third voltage-sharing resistor is formed by connecting one or more resistors in series, or the third voltage-sharing resistor is formed by connecting one or more resistors in parallel.
Fig. 2 is a second topology diagram of a three-phase power circuit in an embodiment of the present application. In the embodiment of fig. 2, the voltage equalizing module of the three-phase power circuit includes: the voltage-sharing circuit comprises a first voltage-sharing resistor R1, a second voltage-sharing resistor R2, a first sampling resistor R '1, a first voltage-sharing resistor R' 1 and a third voltage-sharing resistor R3. The two ends of the first capacitor 12 are connected in parallel with the first voltage-sharing resistor R1, the first voltage-sharing resistor R ″ 1 and the first sampling resistor R' 1 after being connected in series; and two ends of the second capacitor 13 are connected in parallel with the second voltage-sharing resistor R2 and the third voltage-sharing resistor R3.
In the embodiment of fig. 2, a first equivalent resistance of the parallel resistor across the first capacitor is equal to a second equivalent resistance of the parallel resistor across the second capacitor, which is equivalent to R2// R3 ═ R1// (R' 1+ R "1).
For example, in some embodiments, sampling resistors are disposed at both ends of the upper bus capacitor and the lower bus capacitor, and are respectively used for collecting voltages at both ends of the upper bus capacitor and the lower bus capacitor and outputting the voltages to the control module, so that the control module controls the power supply rectification module based on the first sampling voltage and the second control voltage, so that the voltages at both ends of the first capacitor 12 and the second capacitor 13 are equal.
For example, in some embodiments, the voltage equalizing module further comprises: the second sampling resistor and the second voltage-dividing resistor are connected in series and then connected in parallel at two ends of the second capacitor; the control module is further configured to obtain a second sampling voltage across the second sampling resistor, and control a working state of a switch tube group in the power supply rectification module based on the first sampling voltage and the second sampling voltage, so that voltages across the first capacitor and the second capacitor are equal.
Fig. 3 is a third topology diagram of a three-phase power circuit in the embodiment of the present application. In the embodiment of fig. 3, the voltage equalizing module of the three-phase power circuit includes: the voltage-sharing circuit comprises a first voltage-sharing resistor R1, a second voltage-sharing resistor R2, a first sampling resistor R '1, a first voltage-sharing resistor R' 1, a first sampling resistor R '2 and a second voltage-sharing resistor R' 2. The two ends of the first capacitor 12 are connected with the first voltage-sharing resistor R1, and the R '1 and the R' 1 after being connected in series in parallel; and two ends of the second capacitor 13 are connected with the second voltage-sharing resistor R2, and the R '2 and the R' 2 after being connected in series in parallel.
In the embodiment shown in fig. 3, a first equivalent resistance of the parallel resistor across the first capacitor is equal to a second equivalent resistance of the parallel resistor across the second capacitor, which is equivalent to R1// (R '1 + R "1) ═ R2// (R' 2+ R" 2).
In the embodiment of fig. 3, the control module of the three-phase power circuit is further configured to obtain a second sampling voltage across the second sampling resistor R' 2, and control an operating state of a switch tube group in the power rectifying module based on the first sampling voltage and the second sampling voltage, so that voltages across the first capacitor 12 and the second capacitor 13 are equal.
For example, in some embodiments, the control module is configured to determine a first voltage across the first capacitor based on the first sampled voltage; determining a second voltage across the second capacitor based on the second sampled voltage; when the voltage difference between the first voltage and the second voltage is in a first preset range, controlling the working state of a switch tube group in the power supply rectification module so as to enable the charging speed of the first capacitor to be smaller than that of the second capacitor; and when the voltage difference between the first voltage and the second voltage is in a second preset range, controlling the working state of a switch tube group in the power supply rectification module so as to enable the charging speed of the first capacitor to be greater than that of the second capacitor.
Here, the voltage difference between the first voltage and the second voltage is in a first preset range, which represents that the voltage at two ends of the first capacitor is greater than the voltage at two ends of the first capacitor; the voltage difference between the first voltage and the second voltage is in a second preset range, and the voltage at two ends of the first capacitor is represented to be smaller than the voltage at two ends of the first capacitor. In practical application, the first preset range and the second preset range can be set according to actual pressure-equalizing requirements.
Here, since the voltage across the second capacitor 13 is too large and exceeds the sampling threshold of the sampling resistor, the voltage across the second capacitor 13 is determined by connecting the second sampling resistor in series with the second voltage dividing resistor.
For example, in practical applications, the voltage equalizing module may further include a third sampling resistor and a third voltage dividing resistor, where the third sampling resistor is used to determine a voltage across the half-bus load, so as to control the half-bus load.
For example, in some embodiments, the voltage equalizing module further comprises: the third sampling resistor and the third voltage dividing resistor are connected in series and then connected in parallel at two ends of the half bus load; the control module is used for acquiring a third sampling voltage at two ends of the third sampling resistor; and controlling the working state of a switch tube group in the power supply rectifying module based on the first sampling voltage, and controlling the working parameters of the half-bus load based on the third sampling voltage so that the voltages at two ends of the first capacitor and the second capacitor are equal.
Fig. 4 is a fourth topology diagram of a three-phase power circuit in the embodiment of the present application. In the embodiment of fig. 4, the voltage equalizing module of the three-phase power circuit includes: the sampling circuit comprises a first voltage equalizing resistor R1, a second voltage equalizing resistor R2, a first sampling resistor R '1, a first voltage equalizing resistor R' 1, a third sampling resistor R '3 and a third voltage equalizing resistor R' 3. The two ends of the first capacitor 12 are connected with the first voltage-sharing resistor R1, and the R '1 and the R' 1 after being connected in series in parallel; the two ends of the second capacitor 13 are connected with the second voltage-sharing resistor R2 in parallel; and two ends of the half bus load are connected with R '3 and R' 3 in parallel after series connection.
In the embodiment shown in fig. 4, a first equivalent resistance of the parallel resistor across the first capacitor is equal to a second equivalent resistance of the parallel resistor across the second capacitor, which is equivalent to R1// (R "1 + R '1)// (R" 3+ R' 3) ═ R2.
Fig. 5 is a fifth topology diagram of a three-phase power supply circuit in the embodiment of the present application. In the embodiment of fig. 5, the voltage equalizing module of the three-phase power supply circuit includes: voltage-sharing resistors R1-R6, sampling resistors R '1 and R' 3 and voltage-dividing resistors R '1 and R' 3; the two ends of the first capacitor 12 are connected with R1 and R2 in parallel, R '1 and R' 1 after series connection, and R '3 and R' 3 after the two ends of the half bus load are connected with R '3 and R' 3 after series connection; the second capacitor 13 is connected with the two ends of the second capacitor in parallel R3-R6.
In the embodiment of fig. 5, the first equivalent resistance value of the parallel resistor across the first capacitor is equal to the second equivalent resistance value of the parallel resistor across the second capacitor, which is equivalent to R1// R2// (R "1 + R '1)// (R" 3+ R' 3) ═ R3// R4// R5// R6.
Wherein, R "1 and R' 1 constitute a set for Power rectifier module control, and in practical application, Power rectifier circuit can be rectification Power Factor Correction (PFC) circuit. R '3 and R' 3 form a group and are used for half-bus load control.
According to the three-phase power supply conversion circuit, the equivalent resistance values of the two ends of the first capacitor and the second capacitor of the three-phase power supply circuit are configured to be equal, so that the function of resistance voltage sharing is achieved; by setting the sampling resistor, the working parameters of the power supply rectifying module and the half-bus load are controlled according to the voltage of the sampling resistor, and the voltages at two ends of the first capacitor and the second capacitor are dynamically balanced in the circuit operation process. One circuit has two functions, so that the circuit design is simplified, the number of components is saved, the voltage-sharing precision is improved, the average voltage-sharing control of series capacitors is facilitated, overvoltage damage of the capacitors is avoided, and the reliability of the circuit is improved.
It should be noted that the present invention does not require the circuit structure type of the power rectifying module of the power circuit, the number of energy storage capacitors connected in series, the mounting manner and number of the loads on the full bus and the half bus, and the like. All the resistors in the application can be single resistors or resistor networks, namely, a plurality of resistors are connected in parallel or in series to form the resistor network.
It should be noted that, in the present application, detailed description is mainly given for the requirement that the divided voltages at the two ends of the first capacitor and the second capacitor are equal, and in practical application, for the requirement that the voltages at the two ends of the first capacitor and the second capacitor are in a preset proportion, the ratio of the first equivalent resistance value of the parallel resistor at the two ends of the first capacitor to the second equivalent resistance value of the parallel resistor of the second capacitor is in a preset proportion by adjusting the resistance value of the equalizing resistor; the working state of a switch tube group in the power supply rectifying module can be controlled based on the sampling voltage, so that the ratio of the voltages at two ends of the first capacitor to the voltages at two ends of the second capacitor is in a preset proportion.
It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in this application and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items. The expressions "having", "may have", "include" and "contain", or "may include" and "may contain" in this application may be used to indicate the presence of corresponding features (e.g. elements such as values, functions, operations or components) but does not exclude the presence of additional features.
It is to be understood that although the terms first, second, third, etc. may be used herein to describe various information, such information should not be limited to these terms. These terms are only used to distinguish one type of information from another, and are not necessarily used to describe a particular order or sequence. For example, first information may also be referred to as second information, and similarly, second information may also be referred to as first information, without departing from the scope of the present invention.
The technical solutions described in the embodiments of the present application can be arbitrarily combined without conflict.
In the several embodiments provided in the present application, it should be understood that the disclosed method, apparatus, and device may be implemented in other ways. The above-described embodiments are merely illustrative, for example, the division of the unit is only a logical functional division, and there may be other division ways in actual implementation, such as: multiple units or components may be combined, or may be integrated into another system, or some features may be omitted, or not implemented. In addition, the coupling, direct coupling or communication connection between the components shown or discussed may be through some interfaces, and the indirect coupling or communication connection between the devices or units may be electrical, mechanical or other forms.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed on a plurality of network units; some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, all functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may be separately regarded as one unit, or two or more units may be integrated into one unit; the integrated unit can be realized in a form of hardware, or in a form of hardware plus a software functional unit.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application.
Claims (10)
1. A three-phase power supply circuit, characterized in that the three-phase power supply circuit comprises: the system comprises a three-phase power supply, a power supply rectifying module, a first capacitor, a second capacitor, a voltage-sharing module, a half bus load and a full bus load; the three-phase alternating current input end of the power supply rectifying module is connected with the three-phase power supply, and the positive and negative direct current output ends are connected with the first capacitor and the second capacitor which are connected in series with each other and the full bus load; two ends of the first capacitor are connected with the half bus load in parallel;
the voltage-sharing module comprises: the voltage-sharing circuit comprises a first voltage-sharing resistor, a second voltage-sharing resistor, a first sampling resistor and a first voltage-sharing resistor;
two ends of the first capacitor are connected with the first voltage-sharing resistor in parallel; the two ends of the second capacitor are connected with the second voltage-sharing resistor in parallel; the first sampling resistor and the first voltage dividing resistor are connected in series and then connected in parallel at two ends of the first capacitor; the first equivalent resistance value of the parallel resistor at the two ends of the first capacitor is equal to the second equivalent resistance value of the parallel resistor at the two ends of the second capacitor;
the three-phase power supply circuit further comprises a control module, wherein the control module is used for acquiring first sampling voltage at two ends of the first sampling resistor and controlling the working state of a switch tube group in the power supply rectifying module based on the first sampling voltage, so that the voltages at two ends of the first capacitor and the second capacitor are equal.
2. The circuit of claim 1, wherein the voltage grading module further comprises: and the third voltage-sharing resistor is connected in parallel with two ends of the second capacitor.
3. The circuit according to claim 2, wherein the third voltage-sharing resistor is formed by one or more resistors connected in series, or the third voltage-sharing resistor is formed by one or more resistors connected in parallel.
4. The circuit of claim 1, wherein the voltage grading module further comprises: the second sampling resistor and the second voltage-dividing resistor are connected in series and then connected in parallel at two ends of the second capacitor;
the control module is further used for obtaining a second sampling voltage at two ends of the second sampling resistor, and controlling the working state of a switch tube group in the power supply rectification module based on the first sampling voltage and the second sampling voltage, so that voltages at two ends of the first capacitor and the second capacitor are equal.
5. The circuit of claim 4, wherein the control module is configured to determine a first voltage across the first capacitor based on the first sampled voltage; determining a second voltage across the second capacitor based on the second sampled voltage; when the voltage difference between the first voltage and the second voltage is in a first preset range, controlling the working state of a switch tube group in the power supply rectification module so as to enable the charging speed of the first capacitor to be smaller than that of the second capacitor; and when the voltage difference between the first voltage and the second voltage is in a second preset range, controlling the working state of a switch tube group in the power supply rectification module so as to enable the charging speed of the first capacitor to be greater than that of the second capacitor.
6. The circuit of claim 1, wherein the voltage grading module further comprises: the third sampling resistor and the third voltage dividing resistor are connected in series and then connected in parallel at two ends of the half bus load;
the control module is used for acquiring a third sampling voltage at two ends of the third sampling resistor; and controlling the working state of a switch tube group in the power supply rectifying module based on the first sampling voltage, and controlling the working parameters of the half-bus load based on the third sampling voltage, so that the voltages at two ends of the first capacitor and the second capacitor are equal.
7. The circuit of claim 1, wherein the first capacitor is formed by one or more capacitors connected in series, or the first capacitor is formed by one or more capacitors connected in parallel;
the second capacitor is formed by one or more capacitors connected in series, or the second capacitor is formed by one or more capacitors connected in parallel.
8. The circuit according to claim 1, wherein the first voltage-sharing resistor is formed by one or more resistors connected in series, or the first voltage-sharing resistor is formed by one or more resistors connected in parallel;
the second voltage-sharing resistor is formed by connecting one or more resistors in series, or the second voltage-sharing resistor is formed by connecting one or more resistors in parallel.
9. The circuit of claim 1, wherein the control module is configured to determine a first voltage across the first capacitor based on the first sampled voltage; acquiring full bus voltage of the three-phase power supply circuit; and controlling the power supply rectifying module based on the first voltage and the full bus voltage to enable the voltages at two ends of the first capacitor and the second capacitor to be equal.
10. The circuit of claim 9, wherein the control module is configured to determine a second voltage across the second capacitor based on the first voltage and the full bus voltage; when the voltage difference between the first voltage and the second voltage is in a first preset range, controlling the working state of a switch tube group in the power supply rectification module so as to enable the charging speed of the first capacitor to be smaller than that of the second capacitor; and when the voltage difference between the first voltage and the second voltage is in a second preset range, controlling the working state of a switch tube group in the power supply rectification module so as to enable the charging speed of the first capacitor to be greater than that of the second capacitor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221251381.7U CN217406423U (en) | 2022-05-23 | 2022-05-23 | Three-phase power supply circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221251381.7U CN217406423U (en) | 2022-05-23 | 2022-05-23 | Three-phase power supply circuit |
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| Publication Number | Publication Date |
|---|---|
| CN217406423U true CN217406423U (en) | 2022-09-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202221251381.7U Active CN217406423U (en) | 2022-05-23 | 2022-05-23 | Three-phase power supply circuit |
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| Country | Link |
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| CN (1) | CN217406423U (en) |
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- 2022-05-23 CN CN202221251381.7U patent/CN217406423U/en active Active
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