CN111865062B - Auxiliary power supply starting circuit based on single-phase/three-phase booster circuit - Google Patents

Auxiliary power supply starting circuit based on single-phase/three-phase booster circuit Download PDF

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CN111865062B
CN111865062B CN202010697375.3A CN202010697375A CN111865062B CN 111865062 B CN111865062 B CN 111865062B CN 202010697375 A CN202010697375 A CN 202010697375A CN 111865062 B CN111865062 B CN 111865062B
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capacitor
power supply
circuit
phase
starting
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CN111865062A (en
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唐健
杨瑞国
郑山
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Shenzhen Infypower Co ltd
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Shenzhen Infypower Co ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/36—Means for starting or stopping converters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
    • H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
    • H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
    • H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M7/219—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only in a bridge configuration
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0003—Details of control, feedback or regulation circuits
    • H02M1/0006—Arrangements for supplying an adequate voltage to the control circuit of converters

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Dc-Dc Converters (AREA)

Abstract

The invention provides an auxiliary power supply starting circuit based on a single-phase/three-phase booster circuit, which comprises an input power supply, the single-phase booster circuit, a first capacitor and a second capacitor, wherein the input power supply is electrically connected with the single-phase booster circuit, the first capacitor and the second capacitor are connected in series between an output anode and an output cathode of the single-phase booster circuit, the auxiliary power supply starting circuit is provided with a first power taking path and a second power taking path, the first power taking path is used for taking power from the first capacitor or the second capacitor, the second power taking path is used for taking power from the input power supply, the auxiliary power supply starting circuit has faults and is powered on, and when the first power taking path cannot normally take power, the power is taken through the second power taking path. According to the invention, at least one power-taking path of the auxiliary power supply starting circuit is additionally introduced, so that under some fault conditions, the auxiliary power supply starting circuit can take power through the newly introduced power-taking path, and the normal starting of the auxiliary power supply is ensured.

Description

Auxiliary power supply starting circuit based on single-phase/three-phase booster circuit
Technical Field
The invention relates to an auxiliary power supply starting circuit, in particular to an auxiliary power supply starting circuit based on a single-phase/three-phase booster circuit.
Background
An auxiliary power supply in the switching power supply mainly provides stable power supply voltage for chips of unit circuits such as a sampling circuit and a driving circuit, and the unit circuits can work normally.
In some middle-high voltage occasions, the output capacitor electrically connected with the direct current output end of the booster circuit adopts a series connection mode, so that the output capacitor can adopt the output capacitor with lower voltage-withstanding grade, the circuit cost is saved, and meanwhile, the series connection output capacitor is also a necessary structure in the multi-level converter. However, the capacitors connected in series to the positive and negative output terminals have a voltage sharing problem, and in this case, if the auxiliary power supply is designed to take power from the capacitors of the positive and negative output terminals, respectively, and to draw more energy from the capacitor with a high voltage and less energy from the capacitor with a low voltage, the voltage sharing problem can be improved.
The auxiliary power supply control circuit usually selects the output cathode of the boost circuit as a reference Ground (GND), but in the boost circuit in which the output capacitors are connected in series and the auxiliary power supply respectively takes out power from the capacitors of the positive and negative output ends, the output cathode is adopted as the reference Ground (GND), so that the condition that a control feedback signal of the auxiliary power supply taking out power from the capacitor of the positive output end is not in common with the reference Ground (GND) can be caused, at the moment, the non-common ground problem can be avoided by taking the middle point of the capacitor as the reference ground of the auxiliary power supply control circuit, meanwhile, the use of an isolation device is reduced, and the circuit cost is saved.
The auxiliary power supply start circuit generally takes power from a capacitor at the direct current output end, and when the auxiliary power supply control circuit selects the middle point of the capacitor as a reference Ground (GND), the auxiliary power supply start circuit takes power from the capacitor at the positive output end. In some specific cases, the auxiliary power control circuit selects the output negative electrode as the reference Ground (GND), and the starting capacitor in the auxiliary power starting circuit usually takes power from the capacitor at the negative output end. When some faults exist in the switching power supply, the power-taking path of the auxiliary power supply starting circuit is affected, the starting capacitor cannot be charged during power-on, the starting voltage of the auxiliary power supply chip is reached, and further the auxiliary power supply cannot be started, the unit circuit cannot work, and the conditions that the input power supply is cut off cannot be carried out. In this case, since the circuit has no fault indication, it brings a safety hazard to the operator, and even may cause a secondary fault to damage other circuit devices.
Therefore, it is necessary to improve the structure of the power-taking path of the auxiliary power supply start-up circuit.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the utility model provides an auxiliary power supply starting circuit based on single-phase/three-phase boost circuit, aims at solving current auxiliary power supply starting circuit when there is some trouble in the circuit, and the charging path of starting capacitor receives the influence, leads to the unable normal start of starting capacitor, and then leads to auxiliary power supply unable work, forms the potential safety hazard, leads to secondary failure's problem even.
In order to solve the technical problems, the invention adopts the technical scheme that:
the first aspect of the embodiments of the present invention provides an auxiliary power supply starting circuit based on a single-phase boost circuit, including: the power supply comprises an input power supply, a single-phase booster circuit, a first capacitor and a second capacitor;
the input power supply is electrically connected with the single-phase booster circuit, and a first capacitor and a second capacitor are connected in series between the output anode and the output cathode of the single-phase booster circuit;
the auxiliary power supply starting circuit is provided with a first power taking path and a second power taking path, the first power taking path is used for taking power from a first capacitor or a second capacitor, the second power taking path is used for taking power from an input power supply, the auxiliary power supply starting circuit is failed and powered on, and when the first power taking path cannot normally take power, the power is taken through the second power taking path.
The second aspect of the embodiments of the present invention provides an auxiliary power supply starting circuit based on a three-phase boost circuit, including: the three-phase booster circuit comprises a three-phase input power supply, a three-phase booster circuit, a first capacitor and a second capacitor;
the three-phase input power supply is electrically connected with the three-phase booster circuit, and a first capacitor and a second capacitor are connected between the output anode and the output cathode of the three-phase booster circuit in series;
the auxiliary power supply starting circuit is provided with a first power taking path and a second power taking path, the first power taking path is used for taking power from a first capacitor or a second capacitor, the second power taking path is used for taking power from a three-phase input power supply, the auxiliary power supply starting circuit is failed and powered on, and when the first power taking path cannot normally take power, the power is taken through the second power taking path.
From the above description, compared with the prior art, the invention has the following beneficial effects:
the auxiliary power supply starting circuit can get electricity through the newly introduced electricity getting path under certain fault working conditions by additionally introducing the electricity getting path of the at least one auxiliary power supply starting circuit, so that the normal starting of the auxiliary power supply is ensured.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It is to be understood that the drawings in the following description are of some, but not all, embodiments of the invention. For a person skilled in the art, other figures can also be obtained from the provided figures without inventive effort.
Fig. 1 is a circuit diagram of a first auxiliary power supply starting circuit based on a single-phase boost circuit according to an embodiment of the present invention;
FIG. 2 is a circuit diagram of a conventional auxiliary power starting circuit based on a single-phase booster circuit;
fig. 3 is a circuit diagram of a second auxiliary power supply starting circuit based on a single-phase boost circuit according to an embodiment of the present invention;
FIG. 4 is a circuit diagram of a first auxiliary power supply starting circuit based on a three-phase booster circuit according to an embodiment of the present invention;
FIG. 5 is a circuit diagram of a second auxiliary power supply starting circuit based on a three-phase booster circuit according to an embodiment of the present invention;
fig. 6 is a circuit diagram of an auxiliary power supply starting circuit based on a three-phase Vienna circuit according to an embodiment of the present invention.
Detailed Description
For purposes of promoting a clear understanding of the objects, aspects and advantages of the invention, reference will now be made in detail to the present embodiments of the invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements throughout. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Example 1
Referring to fig. 1 and fig. 2, fig. 1 is a circuit diagram of a first auxiliary power supply starting circuit based on a single-phase boost circuit according to an embodiment of the present invention, and fig. 2 is a circuit diagram of a conventional auxiliary power supply starting circuit based on a single-phase boost circuit.
As shown in fig. 1, the auxiliary power supply starting circuit based on the single-phase voltage boost circuit according to the first embodiment of the present invention includes an input power supply a, an input soft start circuit, a single-phase voltage boost circuit, a first capacitor C1, a second capacitor C2, a starting resistor R3, a starting capacitor C3, a first diode D1, and a second diode D2;
the single-phase booster circuit comprises a booster inductor L1 and two parallel switch bridge arms, wherein two ends of the two parallel switch bridge arms form the output positive and negative electrodes of the single-phase booster circuit, the midpoint of one switch bridge arm is electrically connected to one end of the booster inductor L1, and the midpoint of the other switch bridge arm is electrically connected to one end of an input power supply A;
two ends of a series branch formed by connecting the first capacitor C1 and the second capacitor C2 in series are respectively and electrically connected between the output positive electrode and the output negative electrode of the single-phase booster circuit;
the input soft start circuit comprises a normally closed switch S1, a soft start resistor R1 and a normally open switch S2, a series branch formed by mutually connecting the normally closed switch S1 and the soft start resistor R1 in series is mutually connected with a normally open switch S2 in parallel to form a parallel branch, one end of the parallel branch is electrically connected to the other end of the input power supply A, and the other end of the parallel branch is connected to the other end of the boosting inductor L1;
one end of a series branch formed by mutually connecting the starting resistor R3 and the starting capacitor C3 in series is electrically connected to a common connection point of the first capacitor C1 and the second capacitor C2, the other end of the series branch, a cathode of the first diode D1 and a cathode of the second diode D2 form a common connection point, an anode of the first diode D1 is electrically connected to an output anode of the single-phase booster circuit, and an anode of the second diode D2 is electrically connected to a common connection point of the normally-closed switch S1 and the soft-start resistor R1.
It should be noted that the auxiliary power supply start-up circuit provided in this embodiment has two power taking paths, where a first power taking path takes power through the first capacitor C1 and the first diode D1; the second power-taking path takes power through the input power supply a, the normally closed switch S1 and the second diode D2. Specifically, when the circuit normally works, the voltage of the output positive electrode and the output negative electrode of the single-phase booster circuit is higher than the peak voltage of the input power supply a, the starting capacitor C3 is charged through the first capacitor C1 and the first diode D1, and when a circuit fault occurs, such as short circuit and electrification of the capacitor C1, the starting capacitor C3 is charged through the input power supply a, the normally closed switch S1 and the second diode D2, so that the auxiliary power supply can be normally started. After the auxiliary power supply works, the circuit fault can be detected through the unit circuit and the control circuit, the normally closed switch S1 is opened, the input power supply A is cut off, and the overvoltage of the second capacitor C2 is prevented.
It should be further noted that, when the first capacitor C1 is short-circuited and powered on, the charging speed and the voltage of the start capacitor C3 after the charging are determined by the values of the start resistor R3 and the start capacitor C3, and also determined by the values of the soft start resistor R1 and the second capacitor C2, through the input power supply a and the second diode D2. In an actual circuit, because the soft start resistor R1 and the second capacitor C2 are main circuit elements, and values thereof are often fixed, the values of the start resistor R3 and the start capacitor C3 are reasonably adjusted, which is a necessary condition for ensuring that the auxiliary power supply can be normally started when a fault is powered on.
As shown in fig. 2, for the conventional auxiliary power supply starting circuit based on the single-phase boost circuit, the starting capacitor C3 takes power from the first capacitor C1, and when the first capacitor C1 has a short-circuit fault, the starting capacitor C3 cannot be charged after power-up, and all input voltage is applied to the second capacitor C2, which may cause the second capacitor C2 to be damaged due to overvoltage.
The auxiliary power supply starting circuit based on the single-phase booster circuit provided by the first embodiment of the invention increases the power-taking path of the auxiliary power supply starting circuit on the premise of not influencing the normal work of the switching power supply, so that the circuit can be powered on to carry out fault detection under certain fault working conditions, and performs protection action, thereby improving the reliability of the switching power supply, and the newly-added circuit has a simple structure and low device cost.
Example 2
Referring to fig. 3, fig. 3 is a circuit diagram of a second auxiliary power supply starting circuit based on a single-phase boost circuit according to an embodiment of the present invention.
Unlike the auxiliary power supply starting circuit based on the single-phase booster circuit provided in the first embodiment of the present invention, the first power-taking path in the second embodiment of the present invention is power-taken from a capacitor electrically connected to the negative bus, and the normally-closed switch S1 and the soft-start resistor R1 have different positions.
As shown in fig. 3, the auxiliary power supply starting circuit based on the single-phase voltage boost circuit according to the second embodiment of the present invention includes an input power supply a, an input soft start circuit, a single-phase voltage boost circuit, a first capacitor C1, a second capacitor C2, a starting resistor R3, a starting capacitor C3, a first diode D1, and a second diode D2;
the single-phase booster circuit comprises a booster inductor L1 and two parallel switch bridge arms, wherein two ends of the two parallel switch bridge arms form the output positive and negative electrodes of the single-phase booster circuit, the midpoint of one switch bridge arm is electrically connected to one end of the booster inductor L1, and the midpoint of the other switch bridge arm is electrically connected to one end of an input power supply A;
two ends of a series branch formed by connecting the first capacitor C1 and the second capacitor C2 in series are respectively and electrically connected between the output positive electrode and the output negative electrode of the single-phase booster circuit;
the input soft start circuit comprises a normally closed switch S1, a soft start resistor R1 and a normally open switch S2, a series branch formed by mutually connecting the normally closed switch S1 and the soft start resistor R1 in series is mutually connected with a normally open switch S2 in parallel to form a parallel branch, one end of the parallel branch is electrically connected to the other end of the input power supply A, and the other end of the parallel branch is electrically connected to the other end of the boosting inductor L1;
one end of a series branch formed by mutually connecting the starting resistor R3 and the starting capacitor C3 in series is electrically connected to a common connection point of the first capacitor C1 and the second capacitor C2, the other end of the series branch, an anode of the first diode D1 and an anode of the second diode D2 form a common connection point, a cathode of the first diode D1 is electrically connected to an output cathode of the single-phase booster circuit, and a cathode of the second diode D2 is electrically connected to a common connection point of the input power supply A and the soft starting resistor R1.
It should be noted that the auxiliary power supply start-up circuit provided in this embodiment has two power taking paths, where the first power taking path is powered through the second capacitor C2 and the first diode D1; the second power taking path takes power through the input power supply A and the second diode D2. Specifically, when the circuit normally works, the voltage of the output anode and the output cathode of the single-phase booster circuit is higher than the peak voltage of the input power supply a, the starting capacitor C3 is charged through the second capacitor C2 and the first diode D1, and when a circuit fault occurs, such as short circuit and electrification of the capacitor C2, the starting capacitor C3 is charged through the input power supply a and the second diode D2, so that the auxiliary power supply can be normally started. After the auxiliary power supply works, the circuit fault can be detected through the unit circuit and the control circuit, and the normally closed switch S1 is opened to cut off the input power supply A, so that the overvoltage of the capacitor C1 is prevented.
Example 3
Referring to fig. 4, fig. 4 is a circuit diagram of a first auxiliary power supply starting circuit based on a three-phase boost circuit according to an embodiment of the present invention.
Unlike the auxiliary power supply starting circuit based on single-phase boosting provided in the first embodiment and/or the second embodiment of the present invention, the auxiliary power supply starting circuit provided in the third embodiment of the present invention is based on a three-phase boosting circuit.
As shown in fig. 4, the auxiliary power supply starting circuit based on the three-phase voltage boosting circuit according to the third embodiment of the present invention includes a three-phase input power supply (A, B, C), a first input soft start circuit, a second input soft start circuit, a three-phase voltage boosting circuit, a first capacitor C1, a second capacitor C2, a starting resistor R3, a starting capacitor C3, a first diode D1, and a second diode D2;
the three-phase booster circuit comprises three booster inductors (L1, L2 and L3) and three parallel switch bridge arms, wherein two ends of the three parallel switch bridge arms form the output positive and negative electrodes of the three-phase booster circuit, and the middle points of the three switch bridge arms are respectively and electrically connected to one ends of the three booster inductors (L1, L2 and L3);
two ends of a series branch formed by connecting the first capacitor C1 and the second capacitor C2 in series are respectively and electrically connected between the output positive electrode and the output negative electrode of the three-phase booster circuit;
the first input soft start circuit comprises a first normally closed switch S1, a first soft start resistor R1 and a first normally open switch S2, a series branch formed by mutually connecting the first normally closed switch S1 and the first soft start resistor R1 in series is mutually connected with a first normally open switch S2 in parallel to form a first parallel branch, one end of the first parallel branch is electrically connected to one end of one phase A of the three-phase input power supply, and the other end of the first parallel branch is electrically connected to the other end of the boosting inductor L1;
the second input soft start circuit comprises a second normally closed switch S3, a second soft start resistor R2 and a second normally open switch S4, a series branch formed by the mutual series connection of the second normally closed switch S3 and the second soft start resistor R2 and a second normally open switch S4 are connected in parallel to form a second parallel branch, one end of the second parallel branch is electrically connected to one end of one phase B of the three-phase input power supply, and the other end of the second parallel branch is electrically connected to the other end of the boosting inductor L2;
the other end of the boosting inductor L3 is electrically connected to one end of one phase C of the three-phase input power supply, and the other end of one phase A of the three-phase input power supply, the other end of one phase B of the three-phase input power supply and the other end of one phase C of the three-phase input power supply are connected to form a common joint;
one end of a series branch formed by mutually connecting the starting resistor R3 and the starting capacitor C3 in series is electrically connected to a common connection point of the first capacitor C1 and the second capacitor C2, the other end of the series branch, a cathode of the first diode D1 and a cathode of the second diode D2 form a common connection point, an anode of the first diode D1 is electrically connected to an output anode of the three-phase booster circuit, and an anode of the second diode D2 is electrically connected to a common connection point of the first normally-closed switch S1 and the first soft-start resistor R1.
It should be noted that the auxiliary power supply start-up circuit provided in this embodiment has two power taking paths, where a first power taking path takes power through the first capacitor C1 and the first diode D1; the second power-taking path takes power through the input power supply a, the normally closed switch S1 and the second diode D2. Specifically, when the circuit normally works, the voltages of the output positive electrode and the output negative electrode of the three-phase booster circuit are higher than the peak voltage of the three-phase input power supply, the starting capacitor C3 is charged through the first capacitor C1 and the first diode D1, and when a circuit fault occurs, such as short circuit and electrification of the capacitor C1, the starting capacitor C3 is charged through the input power supply a, the normally closed switch S1 and the second diode D2, so that the auxiliary power supply can be normally started. After the auxiliary power supply works, the circuit fault can be detected through the unit circuit and the control circuit, and the first normally closed switch S1 and the second normally closed switch S3 are opened, so that the three-phase input power supply is cut off, and the second capacitor C2 is prevented from being in overvoltage.
Example 4
Referring to fig. 5, fig. 5 is a circuit diagram of a second auxiliary power supply starting circuit based on a three-phase boost circuit according to an embodiment of the present invention.
Unlike the three-phase boost circuit-based auxiliary power starting circuit provided in the third embodiment of the present invention, the first power path in the fourth embodiment of the present invention is powered from a capacitor electrically connected to the negative bus, and a third diode D3 is additionally added.
As shown in fig. 5, an auxiliary power supply starting circuit based on a three-phase voltage boosting circuit according to a fourth embodiment of the present invention includes a three-phase input power supply (A, B, C), a first input soft start circuit, a second input soft start circuit, a three-phase voltage boosting circuit, a first capacitor C1, a second capacitor C2, a starting resistor R3, a starting capacitor C3, a first diode D1, a second diode D2, and a third diode D3;
the three-phase booster circuit comprises three booster inductors (L1, L2 and L3) and three parallel switch bridge arms, wherein two ends of the three parallel switch bridge arms form the output positive and negative electrodes of the three-phase booster circuit, and the middle points of the three switch bridge arms are respectively and electrically connected to one ends of the three booster inductors (L1, L2 and L3);
two ends of a series branch formed by connecting the first capacitor C1 and the second capacitor C2 in series are respectively and electrically connected between the output positive electrode and the output negative electrode of the three-phase booster circuit;
the first input soft start circuit comprises a first normally closed switch S1, a first soft start resistor R1 and a first normally open switch S2, a series branch formed by mutually connecting the first normally closed switch S1 and the first soft start resistor R1 in series is mutually connected with a first normally open switch S2 in parallel to form a first parallel branch, one end of the first parallel branch is electrically connected to one end of one phase A of the three-phase input power supply, and the other end of the first parallel branch is electrically connected to the other end of the boosting inductor L1;
the second input soft start circuit comprises a second normally closed switch S3, a second soft start resistor R2 and a second normally open switch S4, a series branch formed by the mutual series connection of the second normally closed switch S3 and the second soft start resistor R2 and a second normally open switch S4 are connected in parallel to form a second parallel branch, one end of the second parallel branch is electrically connected to one end of one phase B of the three-phase input power supply, and the other end of the second parallel branch is electrically connected to the other end of the boosting inductor L2;
the other end of the boosting inductor L3 is electrically connected to one end of one phase C of the three-phase input power supply, and the other end of one phase A of the three-phase input power supply, the other end of one phase B of the three-phase input power supply and the other end of one phase C of the three-phase input power supply are connected to form a common joint;
one end of a series branch formed by mutually connecting the starting resistor R3 and the starting capacitor C3 in series is electrically connected to a common connection point of the first capacitor C1 and the second capacitor C2, the other end of the series branch forms a common connection point with an anode of the first diode D1, an anode of the second diode D2 and an anode of the third diode D3, a cathode of the first diode D1 is electrically connected to the output cathode of the three-phase booster circuit, a cathode of the second diode D2 is electrically connected to a common connection point of the first normally-closed switch S1 and one phase A of the three-phase input power supply, and a cathode of the third diode D3 is electrically connected to a common connection point of the second normally-closed switch S3 and one phase B of the three-phase input power supply.
It should be noted that the auxiliary power supply start-up circuit provided in this embodiment has two power taking paths, where the first power taking path is powered through the second capacitor C2 and the first diode D1; the second power taking path is used for taking power through one phase A of the three-phase input power supply and the second diode D2, or is used for taking power through one phase B of the three-phase input power supply and the third diode D3. Specifically, when the circuit normally works, the voltages of the output positive and negative poles of the three-phase booster circuit are higher than the peak voltage of the three-phase input power supply, the starting capacitor C3 is charged through the second capacitor C2 and the first diode D1, and when a circuit fault occurs, such as the capacitor C2 is short-circuited and powered on, the starting capacitor C3 is powered through one phase a of the three-phase input power supply and the second diode D2, or the auxiliary power supply can be normally started through one phase B of the three-phase input power supply and the third diode D3. After the auxiliary power supply works, the circuit fault can be detected through the unit circuit and the control circuit, and the first normally closed switch S1 and the second normally closed switch S2 are opened, so that the three-phase input power supply is cut off, and the capacitor C1 is prevented from being in overvoltage.
Compared with the third embodiment, the auxiliary power supply starting circuit based on the three-phase booster circuit provided by the fourth embodiment of the invention increases one-phase input power supply of the three-phase input power supply, and the second power supply path does not pass through the first normally closed switch/the second normally closed switch, so that the charging speed of the starting capacitor can be increased, and the auxiliary power supply can still be normally started after protection action (switching off the first normally closed switch/the second normally closed switch) is executed.
Example 5
Referring to fig. 6, fig. 6 is a circuit diagram of an auxiliary power supply starting circuit based on a three-phase Vienna circuit according to an embodiment of the present invention.
Unlike the auxiliary power supply starting circuit based on the three-phase boost circuit provided in the fourth embodiment of the present invention, the first power-taking path in the fifth embodiment of the present invention takes power from a capacitor electrically connected to the positive bus, and the three-phase boost circuit employs a three-phase Vienna circuit.
As shown in fig. 6, an auxiliary power supply starting circuit based on a three-phase Vienna circuit according to a fifth embodiment of the present invention includes a three-phase input power supply (A, B, C), a first input soft start circuit, a second input soft start circuit, a three-phase Vienna circuit, a first capacitor C1, a second capacitor C2, a starting resistor R3, a starting capacitor C3, a first diode D1, a second diode D2, and a third diode D3;
the three-phase Vienna circuit comprises three boosting inductors (L1, L2 and L3), three parallel diode bridge arms and a three-switch bridge arm, wherein each diode bridge arm consists of two diodes, the cathode of one diode is electrically connected with the anode of the other diode, two ends of each three parallel diode bridge arm form the output anode and the output cathode of the three-phase Vienna circuit, the middle points of the three diode bridge arms are respectively and electrically connected with one end of each three boosting inductor (L1, L2 and L3), each switch bridge arm consists of two switch tubes with connected sources, one end of each three-switch bridge arm is connected to form a common connection point, the common connection point is electrically connected with the common connection point of a first capacitor C1 and a second capacitor C2, and the other end of each three-switch bridge arm is respectively and electrically connected with the middle points of the three diode bridge arms;
two ends of a series branch formed by connecting the first capacitor C1 and the second capacitor C2 in series are respectively and electrically connected between the output positive electrode and the output negative electrode of the three-phase Vienna circuit;
the first input soft start circuit comprises a first normally closed switch S1, a first soft start resistor R1 and a first normally open switch S2, a series branch formed by mutually connecting the first normally closed switch S1 and the first soft start resistor R1 in series is mutually connected with a first normally open switch S2 in parallel to form a first parallel branch, one end of the first parallel branch is electrically connected to one end of one phase A of the three-phase input power supply, and the other end of the first parallel branch is electrically connected to the other end of the boosting inductor L1;
the second input soft start circuit comprises a second normally closed switch S3, a second soft start resistor R2 and a second normally open switch S4, a series branch formed by the mutual series connection of the second normally closed switch S3 and the second soft start resistor R2 and a second normally open switch S4 are connected in parallel to form a second parallel branch, one end of the second parallel branch is electrically connected to one end of one phase B of the three-phase input power supply, and the other end of the second parallel branch is electrically connected to the other end of the boosting inductor L2;
the other end of the boosting inductor L3 is electrically connected to one end of one phase C of the three-phase input power supply, and the other end of one phase A of the three-phase input power supply, the other end of one phase B of the three-phase input power supply and the other end of one phase C of the three-phase input power supply are connected to form a common joint;
one end of a series branch formed by mutually connecting the starting resistor R3 and the starting capacitor C3 in series is electrically connected to a common connection point of the first capacitor C1 and the second capacitor C2, the other end of the series branch forms a common connection point with a cathode of the first diode D1, a cathode of the second diode D2 and a cathode of the third diode D3, an anode of the first diode D1 is electrically connected to an output anode of the three-phase Vienna circuit, an anode of the second diode D2 is electrically connected to a common connection point of the first normally-closed switch S1 and the first soft-start resistor R1, and an anode of the third diode D3 is electrically connected to a common connection point of the second normally-closed switch S3 and the second soft-start resistor R2.
It should be understood that the auxiliary power supply starting circuit provided in this embodiment has two power-taking paths, where the first power-taking path is power-taking through the first capacitor C1 and the first diode D1; the second power taking path is used for taking power through one phase A of the three-phase input power supply and the second diode D2, or is used for taking power through one phase B of the three-phase input power supply and the third diode D3. Specifically, when the circuit normally works, the voltages of the output positive and negative electrodes of the three-phase Vienna circuit are higher than the peak voltage of the three-phase input power supply, the starting capacitor C3 is charged through the first capacitor C1 and the first diode D1, and when the circuit fails, for example, the first capacitor C1 is short-circuited and powered on, the starting capacitor C3 gets power through one phase a of the three-phase input power supply and the second diode D2, or the auxiliary power supply can be normally started through one phase B of the three-phase input power supply and the third diode D3. After the auxiliary power supply works, the circuit fault can be detected through the unit circuit and the control circuit, and the first normally closed switch S1 and the second normally closed switch S2 are opened, so that the three-phase input power supply is cut off, and the capacitor C2 is prevented from being in overvoltage.
It should be noted that, in the summary of the present invention, each embodiment is described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments may be referred to each other. For the method class embodiment, since it is similar to the product class embodiment, the description is simple, and the relevant points can be referred to the partial description of the product class embodiment.
It is further noted that, in the present disclosure, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present disclosure. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined in this disclosure may be applied to other embodiments without departing from the spirit or scope of the disclosure. Thus, the present disclosure is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (13)

1. An auxiliary power supply starting circuit based on a single-phase booster circuit is characterized by comprising: the power supply comprises an input power supply, a single-phase booster circuit, a first capacitor and a second capacitor;
the input power supply is electrically connected with the single-phase booster circuit, and a first capacitor and a second capacitor are connected in series between the output anode and the output cathode of the single-phase booster circuit;
the auxiliary power supply starting circuit is provided with a first power taking path and a second power taking path, the first power taking path takes power from a first capacitor or a second capacitor, and the second power taking path takes power from an input power supply; when the auxiliary power supply starting circuit has no fault, power is taken from the first power taking path; when the first capacitor or the second capacitor has a short-circuit fault, the first power taking path is invalid, and power is taken from the second power taking path.
2. The auxiliary power supply starting circuit based on the single-phase booster circuit as claimed in claim 1, further comprising: an input soft start circuit;
the input soft start circuit comprises a normally closed switch, a soft start resistor and a normally open switch;
the normally closed switch is connected with the soft start resistor in series to form a first series branch, the first series branch is connected with the normally open switch in parallel to form a parallel branch, one end of the parallel branch is electrically connected with the input power supply, and the other end of the parallel branch is electrically connected with the single-phase booster circuit.
3. The auxiliary power supply starting circuit based on the single-phase booster circuit as claimed in claim 2, further comprising: a starting resistor and a starting capacitor;
the starting capacitor is connected with the starting resistor in series to form a second series branch, and the second series branch is connected with the first capacitor in parallel;
or the second series branch is connected with the second capacitor in parallel.
4. The auxiliary power supply starting circuit based on the single-phase boosting circuit according to claim 3, further comprising: a first diode;
when the second series branch is connected with the first capacitor in parallel, the first diode is electrically connected between the output positive electrode of the single-phase booster circuit and the second series branch, and the anode of the first diode is connected with the output positive electrode of the single-phase booster circuit;
or when the second series branch is connected with the second capacitor in parallel, the first diode is electrically connected between the output negative electrode of the single-phase booster circuit and the second series branch, and the cathode of the first diode is connected with the output negative electrode of the single-phase booster circuit;
and when the auxiliary power supply starting circuit is not electrified due to faults, the starting capacitor is charged through the first power taking path, namely the starting capacitor is charged through the first capacitor/the second capacitor and the first diode.
5. The auxiliary power supply starting circuit based on the single-phase boosting circuit according to claim 4, further comprising: a second diode;
the second diode is electrically connected between a common joint between the second series branch and the first diode and the input soft start circuit, and when the auxiliary power supply starting circuit is electrified due to failure, the starting capacitor is charged through the input power supply, the normally closed switch and the second diode;
or, the starting capacitor is charged through the input power supply and the second diode.
6. The single-phase boost circuit-based auxiliary power supply starting circuit according to claim 1, wherein said single-phase boost circuit comprises: at least one switching leg;
and the two ends of the switch bridge arm form the output positive and negative electrodes of the single-phase booster circuit.
7. An auxiliary power supply starting circuit based on a three-phase booster circuit is characterized by comprising: the three-phase booster circuit comprises a three-phase input power supply, a three-phase booster circuit, a first capacitor and a second capacitor;
the three-phase input power supply is electrically connected with the three-phase booster circuit, and a first capacitor and a second capacitor are connected between the output anode and the output cathode of the three-phase booster circuit in series;
the auxiliary power supply starting circuit is provided with a first power taking path and a second power taking path, the first power taking path takes power from a first capacitor or a second capacitor, and the second power taking path takes power from a three-phase input power supply; when the auxiliary power supply starting circuit has no fault, power is taken from the first power taking path; when the first capacitor or the second capacitor has a short-circuit fault, the first power taking path is invalid, and power is taken from the second power taking path.
8. The three-phase boost circuit-based auxiliary power supply starting circuit according to claim 7, further comprising: at least two input soft start circuits;
the input soft start circuit comprises a normally closed switch, a soft start resistor and a normally open switch;
the normally closed switch is connected with the soft start resistor in series to form a first series branch, the first series branch is connected with the normally open switch in parallel to form a first parallel branch, one end of the first parallel branch is electrically connected with one phase of the three-phase input power supply, the other end of the first parallel branch is electrically connected with the three-phase booster circuit, and an input soft start circuit is electrically connected between at least two phases of the three-phase input power supply and the three-phase booster circuit.
9. The three-phase boost circuit-based auxiliary power supply starting circuit according to claim 8, further comprising: a starting resistor and a starting capacitor;
the starting capacitor is connected with the starting resistor in series to form a second series branch, and the second series branch is connected with the first capacitor in parallel;
or the second series branch is connected with the second capacitor in parallel.
10. The three-phase boost circuit-based auxiliary power supply starting circuit according to claim 9, further comprising: a first diode;
when the second series branch is connected with the first capacitor in parallel, the first diode is electrically connected between the output positive electrode of the three-phase booster circuit and the second series branch, and the anode of the first diode is connected with the output positive electrode of the three-phase booster circuit;
or when the second series branch is connected with the second capacitor in parallel, the first diode is electrically connected between the output cathode of the three-phase booster circuit and the second series branch, and the cathode of the first diode is connected with the output cathode of the three-phase booster circuit;
and when the auxiliary power supply starting circuit is not electrified due to faults, the starting capacitor is charged through the first power taking path, namely the starting capacitor is charged through the first capacitor/the second capacitor and the first diode.
11. The three-phase boost circuit-based auxiliary power supply starting circuit according to claim 10, further comprising: at least one second diode;
the second diode is electrically connected between a common joint between the second series branch and the first diode and the input soft start circuit, and when the auxiliary power supply starting circuit is electrified due to failure, the starting capacitor is charged through at least one phase of the three-phase input power supply, the normally closed switch and the second diode;
or, the starting capacitor is charged through at least one phase of the three-phase input power supply and the second diode.
12. The three-phase boost circuit-based auxiliary power supply starting circuit according to claim 7, wherein said three-phase boost circuit comprises: at least a three-switch bridge arm;
the switch bridge arms are connected in parallel to form a second parallel branch, and two ends of the second parallel branch form the output positive and negative poles of the three-phase booster circuit.
13. The auxiliary power supply starting circuit based on the three-phase boosting circuit as claimed in claim 7, wherein said three-phase boosting circuit is a three-phase Vienna circuit.
CN202010697375.3A 2020-07-20 2020-07-20 Auxiliary power supply starting circuit based on single-phase/three-phase booster circuit Active CN111865062B (en)

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