CN215120579U - Switching power supply circuit, driving device and power electronic power switch - Google Patents
Switching power supply circuit, driving device and power electronic power switch Download PDFInfo
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- CN215120579U CN215120579U CN202120839802.7U CN202120839802U CN215120579U CN 215120579 U CN215120579 U CN 215120579U CN 202120839802 U CN202120839802 U CN 202120839802U CN 215120579 U CN215120579 U CN 215120579U
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Abstract
The embodiment of the application provides a switching power supply circuit, drive arrangement and power electronic power switch, and this switching power supply circuit includes: the voltage-sharing unit is used for balancing voltages at two ends of the two power tubes; the self-starting unit is used for enabling the switching power supply to be self-started; the feedback driving unit is used for continuously driving the two power tubes to be simultaneously switched on and off by utilizing energy fed back by the secondary winding, so that power conversion is realized. According to the technical scheme, the self-starting and on-off control of the double power tubes can be realized through a discrete device without using a special power tube control chip, the hardware cost is greatly reduced, the input voltage is allowed to change within a certain range, and the system stability is improved.
Description
Technical Field
The application relates to the technical field of switching power supplies, in particular to a switching power supply circuit, a driving device and a power electronic power switch.
Background
In the switching power supply circuit, a special power management control chip is usually adopted to output a PWM (pulse width modulation) signal required by a power tube, which also causes that the cost of the power supply product is difficult to reduce. In addition, for some switching power supply circuits in specific situations, since the accessed voltage signal is often changed, the power supply circuit is also required to be capable of allowing access to an input voltage with a certain change range, especially a high voltage at the time of peak. For example, in the case of a hybrid circuit breaker, in which a power electronic power switch is connected in parallel to both ends of a mechanical switch to extinguish an arc, since an arc voltage generated by the mechanical switch may be as high as 1000V or more at the highest voltage, a power circuit such as the power electronic power switch needs to have a certain withstand voltage capability.
SUMMERY OF THE UTILITY MODEL
The embodiment of the application provides a switching power supply circuit, a driving device and a power electronic power switch, which not only greatly reduces the hardware cost, but also can allow the input voltage to change within a certain range, and can improve the system safety, stability and the like.
The embodiment of the application provides a switching power supply circuit, includes: the voltage-sharing circuit comprises a voltage-sharing unit, a self-starting unit, a transformer, a double-tube power conversion unit, a sampling unit, a feedback driving unit and a rectification filtering unit, wherein the double-tube power conversion unit comprises a first power tube and a second power tube, and the transformer comprises a primary side main winding and a primary side auxiliary winding;
the primary side main winding is used for being connected with an input voltage, and the primary side main winding, the first power tube, the primary side auxiliary winding, the second power tube and the sampling unit are sequentially connected;
the secondary winding of the transformer is respectively connected with the rectifying and filtering unit and the feedback driving unit, and the rectifying and filtering unit is used for being connected with a power supply object;
the voltage equalizing unit is connected with the double-tube power conversion unit and is also used for connecting the input voltage;
the first end of the self-starting unit is used for being connected with the input voltage, the second end and the feedback driving unit are connected with the control ends of the two power tubes, and the third end and the feedback driving unit are connected to a power ground through the sampling unit.
In some embodiments, the voltage equalizing unit is configured to equalize voltages across the first power tube and the second power tube;
the voltage-sharing unit comprises a first balancing capacitor and a second balancing capacitor which are connected in series, the non-series connection end of the first balancing capacitor and the non-series connection end of the second balancing capacitor are used for being connected with the input voltage, and the series connection end is connected with a series connection node between the first power tube and the primary side auxiliary winding.
In some embodiments, the self-starting unit is used for taking power from the input voltage to provide a starting voltage of a circuit;
the self-starting unit comprises a starting resistor and a first voltage-stabilizing tube which are arranged in series, one end of the starting resistor is used for being connected with the input voltage, and the series connection end of the starting resistor and the first voltage-stabilizing tube is connected to the control ends of the two power tubes.
In some embodiments, the secondary winding of the transformer includes a secondary main winding and a secondary auxiliary winding, the secondary main winding is connected to the rectifying and filtering unit, the secondary auxiliary winding is connected to the feedback driving unit, and the feedback driving unit is configured to obtain inductive power from the secondary winding and drive the two power tubes to be turned on and off simultaneously;
the feedback driving unit comprises a first switching tube, a charging and discharging electronic unit and a feedback subunit, the sampling unit comprises a sampling resistor, a first end of the secondary auxiliary winding passes through the feedback subunit and then is respectively connected with the double-tube power conversion unit and a first end of the first switching tube, and the first end of the secondary auxiliary winding is also connected with the charging and discharging electronic unit;
the charging and discharging electronic unit is connected with the second end of the first switching tube, and the third end of the first switching tube is connected with a power ground;
the non-series connection end of the first voltage-stabilizing tube and the second end of the secondary auxiliary winding are connected with a power ground through the sampling resistor.
In some embodiments, the feedback sub-unit includes a blocking capacitor and a protection resistor arranged in series, and the charge and discharge sub-unit includes a charging capacitor, a first resistor, a second resistor, a first diode, a second diode, and a second voltage regulator;
the other end of the blocking capacitor is connected with the first end of the secondary auxiliary winding, and the other end of the protection resistor is respectively connected with the first end of the first switch tube and the serial connection end of the starting resistor and the first voltage-regulator tube;
the second end of the first switch tube is connected with the first end of the charging capacitor, and the second end of the charging capacitor is connected with one end of the sampling unit;
the first end of the charging capacitor is also connected with one end of the first resistor and one end of the second resistor respectively, and the other end of the first resistor, the first diode, the second voltage-regulator tube and the other end of the second resistor are connected in sequence;
and the first end of the secondary auxiliary winding is also connected with the series connection end of the first diode and the second diode.
In some embodiments, the switching power supply circuit further includes: the primary side auxiliary winding comprises a first absorption circuit and a second absorption circuit, wherein the first absorption circuit is connected to two ends of the primary side main winding in parallel, and the second absorption circuit is connected to two ends of the primary side auxiliary winding in parallel.
An embodiment of the present application further provides a driving apparatus, including: the power supply comprises a switching power supply circuit, a linear power supply circuit and a voltage-stabilizing output circuit, wherein the switching power supply circuit adopts the switching power supply circuit, the input end of the linear power supply circuit is used for connecting an input voltage, and the output ends of the switching power supply circuit and the linear power supply circuit are both connected with the input end of the voltage-stabilizing output circuit; the voltage stabilizing output circuit is used for being connected with a main power tube to drive the main power tube to be switched on or switched off.
In some embodiments, the linear power supply circuit comprises a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, a second switch tube, a third power tube and a filtering output unit;
the first end of the third power tube is used for connecting the input voltage, the second end of the third power tube is connected with the filtering output unit, and the filtering output unit is also connected with the voltage stabilizing output circuit;
one end of the third resistor is used for connecting the input voltage, and the other end of the third resistor is connected with the fourth resistor and is also connected to the first end of the second switching tube through the fifth resistor;
the second end of the second switch tube is used for being connected with the input voltage, a sixth resistor is arranged between the second end and the third end of the second switch tube, the third end of the second switch tube and the third end of the third power tube are both connected with the first end of the seventh resistor, and the second end of the seventh resistor is connected with the power ground.
In some embodiments, the voltage-stabilizing output circuit comprises an input filtering unit, a first energy-storing capacitor, a voltage-stabilizing protection unit and a second energy-storing capacitor which are connected in sequence, wherein the voltage-stabilizing protection unit comprises a transient diode and a third voltage-stabilizing tube, the anode of the transient diode is connected with the anode of the first energy-storing capacitor, the cathode of the transient diode is connected with the first end of the third voltage-stabilizing tube, and the second end of the third voltage-stabilizing tube is connected with the cathode of the first energy-storing capacitor; the second energy storage capacitor is connected in parallel to two ends of the third voltage regulator tube and is used for being connected with the main power tube.
The embodiment of the present application further provides a power electronic power switch, including: the power tube driving device comprises a main power tube and a power tube driving circuit connected with the main power tube, wherein the power tube driving circuit adopts the driving device.
The embodiment of the application has the following beneficial effects:
the switching power supply circuit of the embodiment of the application carries out self-starting control on the switching power supply circuit by forming the self-starting and feedback driving unit based on the discrete device and carries out simultaneous on-off control on the double power tubes in the circuit, and because a special power supply control chip is not needed to drive the power tubes, the hardware design cost can be greatly reduced; in addition, two power tubes connected in series are used for forming double-path power conversion, so that the input voltage range of the circuit can be enlarged, the voltage is allowed to change within a certain range, and the stability, safety and the like of the system are improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.
Fig. 1 is a schematic structural diagram of a switching power supply circuit according to an embodiment of the present application;
fig. 2 shows a circuit schematic of a dual-transistor power conversion unit of a switching power supply circuit according to an embodiment of the present application;
fig. 3 shows a circuit schematic of a switching power supply circuit of an embodiment of the present application;
fig. 4 is a schematic structural diagram showing a driving device according to an embodiment of the present application;
FIG. 5 shows a circuit schematic of a linear power supply circuit of an embodiment of the present application;
FIG. 6 is a schematic diagram of a regulated output circuit according to an embodiment of the present application;
FIG. 7 shows a circuit schematic of a regulated output circuit of an embodiment of the present application;
fig. 8 shows a schematic structural diagram of a power electronic power switch according to an embodiment of the present application.
Description of the main element symbols:
100-a switching power supply circuit; 110-a voltage equalizing unit; 120-a self-starting unit; t1-transformer; 130-a dual-tube power conversion unit; 140-a sampling unit; 150-a feedback drive unit; 151-a charge-discharge electronic unit; 152-a feedback subunit; 160-a rectifying and filtering unit; 200-a linear power supply circuit; 300-a voltage stabilization output circuit; 301-an input filtering unit; 302-a voltage stabilization protection unit; c21 — a first energy storage capacitor; c22-second energy storage capacitor; q0-main power tube; 10-power electronic power switch.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments.
The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present application without making any creative effort, shall fall within the protection scope of the present application.
Hereinafter, the terms "including", "having", and their derivatives, which may be used in various embodiments of the present application, are intended to indicate only specific features, numbers, steps, operations, elements, components, or combinations of the foregoing, and should not be construed as first excluding the existence of, or adding to, one or more other features, numbers, steps, operations, elements, components, or combinations of the foregoing.
Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the various embodiments of the present application belong. Terms such as those defined in commonly used dictionaries will be interpreted as having a meaning that is the same as a contextual meaning in the related art and will not be interpreted as having an idealized or overly formal meaning unless expressly so defined herein in various embodiments.
Example 1
Referring to fig. 1, the present embodiment provides a switching power supply circuit 100, which can be used in various situations requiring power conversion, especially in situations where the input voltage may vary within a certain range, and the switching power supply circuit 100 not only can reduce the hardware cost, but also can allow the input voltage to vary within a certain range.
Exemplarily, as shown in fig. 1, the switching power supply circuit 100 includes a voltage equalizing unit 110, a self-starting unit 120, a transformer T1, a dual-transistor power converting unit 130, a sampling unit 140, a feedback driving unit 150, and a rectifying and filtering unit 160, wherein the dual-transistor power converting unit 130 includes two power transistors arranged in series for forming two-transistor power conversion, which may increase an input voltage range accessed by the circuit. Even if the input voltage varies within a certain range, the output of the switching power supply is not affected.
The transformer T1 is used for receiving an input voltage, and the voltage equalizing unit 110 is connected to the dual-transistor power converting unit 130 and is also used for connecting the received input voltage; the double-tube power conversion unit 130 is also connected with the transformer T1 and the sampling unit 140 respectively; the secondary winding is connected to the rectifying and smoothing unit 160 and the feedback driving unit 150, respectively, and the rectifying and smoothing unit 160 is used for connecting to the power supply object. The first terminal of the self-starting unit 120 is used for receiving an input voltage, the second terminal and the feedback driving unit 150 are both connected to the control terminals of two power transistors in the dual-transistor power conversion unit 130, and the third terminal and the feedback driving unit 150 are both connected to a power ground through the sampling unit 140. It is understood that the above-mentioned power ground refers to a low potential end of the input voltage.
In one embodiment, as shown in fig. 2, the transformer T1 includes a primary main winding and a primary auxiliary winding, wherein the primary main winding is used for receiving an input voltage, the primary main winding, the first power transistor Q1, the primary auxiliary winding, and the second power transistor Q2 are connected in sequence, and gates of the first power transistor Q1 and the second power transistor Q2 are connected to serve as a common control terminal. And the secondary winding of the transformer T1 includes a secondary main winding connected to the rectifying and smoothing unit 160 and a secondary auxiliary winding connected to the feedback driving unit 150.
Further, the switching power supply circuit 100 further includes a first absorption circuit and a second absorption circuit, wherein the first absorption circuit is connected in parallel to two ends of the primary main winding, and the second absorption circuit is connected in parallel to two ends of the primary auxiliary winding, for example, as shown in fig. 2, the first absorption circuit is composed of a resistor R11, a capacitor C11 and a diode D11; the second snubber circuit is composed of a resistor R12, a capacitor C12, and a diode D12. It can be understood that, due to the existence of leakage inductance in the winding of the transformer T1, a voltage spike is usually generated at the pin when the power tube is turned off, the spike voltage can be suppressed by connecting the corresponding absorption circuit in parallel, and the efficiency of the switching power supply can be improved by absorbing the energy of the leakage inductance.
The voltage equalizing unit 110 is used for equalizing voltages at two ends of the first power tube Q1 and the second power tube Q2, so that respective terminal voltages of the two power tubes Q1 and Q2 are equal, for example, for a higher voltage of some peaks, the peak voltage can be equalized in the two power tubes through voltage equalizing processing, and the voltage withstanding capability of the circuit is improved.
Exemplarily, as shown in fig. 3, the voltage equalizing unit 110 includes a first equalizing capacitor C1 and a second equalizing capacitor C2 arranged in series, wherein a non-series connection (i.e., two ends) of the first equalizing capacitor C1 and the second equalizing capacitor C2 is used for connecting the input voltage, and a series connection (i.e., a middle series node) is connected to a series node between the first power transistor Q1 and the primary side auxiliary winding.
As described above, the self-starting unit 120 is used for taking power from the input voltage to provide the starting voltage of the circuit, so that the two power transistors Q1 and Q2 can enter a conducting state. It is understood that the magnitude of the circuit self-starting voltage can be set by adjusting the devices in the starting unit, and for example, can be set to 100V, 200V, and the like.
Exemplarily, as shown in fig. 3, the self-starting unit 120 includes a starting resistor Rg and a first voltage regulator ZD1 which are arranged in series, wherein one end of the starting resistor Rg is used for connecting an input voltage, and a series connection end of the starting resistor Rg and the first voltage regulator ZD1 is connected to control ends of two power tubes Q1 and Q2.
After the circuit is started, under the condition that the secondary auxiliary winding of the transformer T1 generates induced electric energy, the feedback driving unit 150 is used for acquiring energy from the secondary winding, and further drives the two power tubes Q1 and Q2 by utilizing repeated charging and discharging of a capacitor and combining a switching tube, so that the two power tubes Q1 and Q2 are controlled to be switched on and off simultaneously. When the two power tubes Q1 and Q2 are turned off, the secondary primary winding releases energy and outputs a supply voltage required by a connected power-supplied object through the rectifying and filtering unit 160, that is, the switching power supply circuit 100 is also a flyback power supply circuit. In one embodiment, the rectifying and smoothing unit 160 is mainly composed of a diode D13, a capacitor C13, a resistor R13, and the like.
Exemplarily, as shown in fig. 3, the feedback driving unit 150 includes a first switching tube S1, a charge/discharge electronic unit 151, and a feedback sub-unit 152, and the sampling unit 140 includes a sampling resistor Rs, wherein a first end of the secondary auxiliary winding passes through the feedback sub-unit 152 and then is connected to the dual-tube power conversion unit 130 and a first end of the first switching tube S1, and the first end of the secondary auxiliary winding is further connected to the charge/discharge electronic unit 151; the charge-discharge electronic unit 151 is connected with the second end of the first switch tube S1, and the third end of the first switch tube S1 is connected with the power ground; the non-series connection end of the first voltage-stabilizing tube ZD1 and the second end of the secondary auxiliary winding are both connected with the power ground through the sampling resistor Rs.
In an embodiment, the feedback subunit 152 includes a blocking capacitor C14 and a protection resistor R14 that are arranged in series, and the charge and discharge electronic unit 151 includes a charging capacitor C10, a resistor R15, a resistor R16, a diode D14, a diode D15, and a second voltage regulator ZD2, as shown in fig. 3, the other end of the blocking capacitor C14 is connected to the first end of the secondary auxiliary winding, and the other end of the protection resistor R14 is connected to the first end of the first switch tube S1 and the series connection end of the starting resistor Rg and the first voltage regulator ZD1, respectively; a second end of the first switch tube S1 is connected to a first end of the charging capacitor C10, and a second end of the charging capacitor C10 is connected to one end of the sampling unit 140; the first end of the charging capacitor C10 is also respectively connected with one end of a resistor R15 and one end of a resistor R16, and the other end of the resistor R15, a diode D14, a diode D15, a second voltage regulator tube ZD2 and the other end of the resistor R16 are sequentially connected; the first end of the secondary auxiliary winding is also connected to the series connection of diode D14 and diode D15.
The input voltage may be, for example, a dynamically changing arc voltage, or may be other voltages that can be used to provide energy, such as a fixed voltage, and is not limited herein. The power supply target may be a different load circuit, for example, a power tube and a required driving component, or a power conversion circuit, and is not limited herein.
In use, the switching power supply circuit 100 operates as follows: when the input voltage is in the working voltage range of the switching circuit, the starting resistor Rg and the first voltage-regulator tube ZD1 obtain the starting voltage from the input voltage, so that the two power tubes Q1 and Q2 can enter a conducting state, the secondary auxiliary winding generates inductive energy, the charging capacitor C10 is charged through the diode D15, the second voltage-regulator tube ZD2 and the resistor R16, when the voltage of the charging capacitor C10 exceeds the base driving voltage of the first switching tube S1, the first switching tube S1 is conducted, and at the moment, the gate voltages of the two power tubes Q1 and Q2 are pulled down, so that the two power tubes are cut off. The charging capacitor C10 forms a discharge circuit through the resistor R15, the diode D14 and the secondary auxiliary winding. When the voltage of the charging capacitor C10 is lower than the base driving voltage of the first switch tube S1, the first switch tube S1 is turned off, and at this time, the gate voltages of the two power tubes Q1 and Q2 are pulled high and turned on, and the operation is controlled in such a way cyclically until the input voltage does not meet the requirement.
It can be understood that the dc blocking capacitor C14 has the function of ac blocking, and when current is generated in the secondary winding, the current can reach the control end of the power tube through the dc blocking capacitor C14. In addition, the capacitance value of the blocking capacitor C14 can also limit the maximum pulse width modulation signal of the power tube to protect the power tube. The charging capacitor C10 and the first switch tube S1 are combined to continuously charge and discharge the charging capacitor C10 to control the first switch tube S1 to be continuously turned on and off, so as to cyclically drive the two power tubes Q1 and Q2 connected in series to be turned on and off at the same time.
The switching power supply circuit 100 of this embodiment uses a discrete device to construct a driving structure for driving two power transistors in the switching power supply without using a dedicated control chip, and performs feedback control by using energy stored in a secondary winding of the transformer T1, and realizes repeated on-off control of the two power transistors by combining repeated charging and discharging of a capacitor and the switching transistors, thereby achieving the purpose of power conversion. The scheme has low hardware cost, adopts a flyback design with two input tubes, can allow the input voltage to change within a certain range, improves the system stability and the like.
Example 2
Referring to fig. 4, the present embodiment provides a driving apparatus, which can be used in various situations requiring power transistor driving, and the driving apparatus is provided with two power circuits to perform power conversion under different voltages, so that the circuits can allow access to a wider range of input voltages, and the like.
Exemplarily, as shown in fig. 4, the driving apparatus includes a switching power supply circuit 100, a linear power supply circuit 200, and a regulated output circuit 300, wherein the input terminals of the linear power supply circuit 200 and the switching power supply circuit 100 are both used for connecting the same input voltage, and the output terminals of the switching power supply circuit 100 and the linear power supply circuit 200 are both connected to the input terminal of the regulated output circuit 300. The output end of the regulated output circuit 300 is used for connecting the main power transistor Q0, and further used for driving the main power transistor Q0 to be turned on or off. In this embodiment, the switching power supply circuit 100 in embodiment 1 is used as the switching power supply circuit 100. It is to be understood that the alternatives described above in embodiment 1 are equally applicable to this embodiment, and therefore will not be described again here.
For the linear power circuit 200, in an embodiment, as shown in fig. 5, the linear power circuit 200 includes a third resistor R1, a fourth resistor R2, a fifth resistor R3, a sixth resistor R4, a seventh resistor R5, a second switching tube S2, a third power tube Q3, and a filter output unit, where a first end of the third power tube Q3 is used to connect an input voltage, a second end of the third power tube Q3 is connected to the filter output unit, and the filter output unit is further connected to the regulated voltage output circuit 300; one end of the third resistor R1 is used for connecting an input voltage, the other end is connected to the first end of the second switch tube S2 through the fifth resistor R3, and the other end is further connected to the fourth resistor R2; the second end of the second switch tube S2 is used for connecting an input voltage, a sixth resistor R4 is arranged between the second end and the third end of the second switch tube S2, the third end of the second switch tube S2 and the third end of the third power tube Q3 are both connected with the first end of the seventh resistor R5, and the second end of the seventh resistor R5 is connected with a power ground. For example, the filter output unit may be composed of a resistor R6, a rectifier D2, an output capacitor C1, and the like.
When the input voltage is within the operating voltage range of the linear power supply circuit 200, the voltage is divided by the third resistor R1 and the fourth resistor R2, and the divided voltage is smaller than the conduction threshold of the second switch tube S2, so that the second switch tube S2 is not conducted, the third power tube Q3 is conducted, and the voltage is reduced and output through the resistor R6, the diode D2 and the capacitor C1, and the output voltage serves as a driving power supply of the main power tube Q0 and is used for supplying power to subsequent circuits. When the input voltage exceeds the operating voltage range, the second switch tube S2 is turned on, and the third power tube Q3 is turned off, so that the linear power circuit 200 does not operate.
It is understood that the linear power circuit 200 and the switching power circuit 100 can be designed to operate in different voltage ranges, for example, when the input voltage is less than a certain threshold, the linear power circuit 200 can only output the required driving power; conversely, when the input voltage is greater than or equal to the threshold value, the switching power supply circuit 100 operates. Thus, a stable output can be obtained regardless of the input voltage as long as the voltage operating region of the drive device is within. Alternatively, for the switching power supply circuit 100, in consideration of a certain time required for starting the switching power supply circuit, in order to avoid a power supply interruption phenomenon of two power supply circuits during a switching process, a hysteresis interval may be set, that is, when an input voltage is in the hysteresis interval, two power supply circuits operate simultaneously, where the hysteresis interval may be implemented by setting a self-starting voltage of the switching power supply circuit 100.
For example, if the above-mentioned division threshold is set to 220V, that is, when the input voltage is less than 220V, the linear power circuit 200 steps down the input voltage and outputs the operating voltage required by the regulated output circuit 300; if the input voltage is greater than or equal to 220V, the switching power supply circuit 100 will automatically start to enter the working state, and step down the working voltage required by the regulated output circuit 300. Alternatively, if a hysteresis interval, such as 200V to 220V, is provided, the switching power supply circuit 100 will also start up when the input voltage is greater than 200V.
It is understood that, for the above threshold setting, the size of the relevant components in the linear power circuit 200 for controlling the third power transistor Q3 can be selected reasonably, and similarly, the size of each component in the self-starting unit 120 can be set reasonably by the switching power circuit 100. In addition, in practical application, the number of the single resistors in each circuit is not limited to one, and specifically, the single resistors are obtained by connecting one or more resistors in series and/or in parallel according to the required resistance value.
For the regulated output circuit 300, exemplarily, as shown in fig. 6, the regulated output circuit 300 includes an input filtering unit 301, a first energy storage capacitor C21, a regulated protection unit 302, and a second energy storage capacitor C22, which are connected in sequence.
In one embodiment, as shown in fig. 7, the zener protection unit 302 includes a transient diode (i.e., TVS transistor) and a voltage regulator ZD20, an anode of the transient diode is connected to an anode of the first energy storage capacitor C21, a cathode of the transient diode is connected to a first end of the voltage regulator ZD20, and a second end of the voltage regulator ZD20 is connected to a cathode of the first energy storage capacitor C21; the second energy storage capacitor C22 is connected in parallel to two ends of the voltage regulator tube ZD20, and the second energy storage capacitor C22 is used for connecting the main power tube Q0. In addition, the input filter unit 301 may include a capacitor C20, a resistor R20, a diode D20, and the like; the voltage regulator protection unit 302 may include a first energy storage capacitor C21, a TVS transistor, a voltage regulator ZD20, and a resistor R21. It can be understood that the voltage outputted by the power circuit is filtered by the input filter unit 301, and the regulated protection unit 302 and the second energy-storage capacitor C22 are used to drive the main power transistor Q0 to turn on or off when the voltage across the first energy-storage capacitor C21 exceeds the threshold voltage of the TVS transistor.
The driving apparatus of this embodiment sets two power supply circuits and makes the two power supply circuits work in different voltage ranges, and selects one of the two power supply circuits or simultaneously supplies power to the voltage stabilization output circuit 300 according to the magnitude of the input voltage, because the switching power supply circuit 100 itself has a wide-range voltage input function, the input voltage range allowed to be accessed by the circuit can be further expanded by connecting a linear power supply circuit 200 in parallel, thereby well solving the problem of wide voltage input and stable output.
For example, when the power electronic power switch 10 is applied to the power electronic power switch 10, and the power electronic power switch 10 is connected in parallel with a mechanical switch to rapidly extinguish the arc, the driving device can use the generated arc voltage as an input voltage, and can obtain a stable output of the driving power supply for driving the main power tube Q0 even if the arc voltage has a wide variation range, thereby realizing the conduction control of the main power tube Q0. It will be appreciated that the drive mechanism may be used in other applications and is not limited thereto.
The embodiment of the present application further provides a power electronic power switch 10, and exemplarily, as shown in fig. 8, the power electronic power switch 10 includes a main power transistor Q0 and a power transistor driving circuit connected to the main power transistor Q0, wherein the power transistor driving circuit is to be implemented by using the driving apparatus in embodiment 2.
It is to be understood that the alternatives described above in relation to the switching power supply circuit 100 in embodiment 1 are also applicable to this embodiment, and therefore, the description thereof will not be repeated.
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 switching power supply circuit, comprising: the voltage-sharing circuit comprises a voltage-sharing unit, a self-starting unit, a transformer, a double-tube power conversion unit, a sampling unit, a feedback driving unit and a rectification filtering unit, wherein the double-tube power conversion unit comprises a first power tube and a second power tube, and the transformer comprises a primary side main winding and a primary side auxiliary winding;
the primary side main winding is used for being connected with an input voltage, and the primary side main winding, the first power tube, the primary side auxiliary winding, the second power tube and the sampling unit are sequentially connected;
the secondary winding of the transformer is respectively connected with the rectifying and filtering unit and the feedback driving unit, and the rectifying and filtering unit is used for being connected with a power supply object;
the voltage equalizing unit is connected with the double-tube power conversion unit and is also used for connecting the input voltage;
the first end of the self-starting unit is used for being connected with the input voltage, the second end and the feedback driving unit are connected with the control ends of the two power tubes, and the third end and the feedback driving unit are connected to a power ground through the sampling unit.
2. The switching power supply circuit according to claim 1, wherein the voltage equalizing unit is configured to equalize voltages across the first power transistor and the second power transistor;
the voltage-sharing unit comprises a first balancing capacitor and a second balancing capacitor which are connected in series, the non-series connection end of the first balancing capacitor and the non-series connection end of the second balancing capacitor are used for being connected with the input voltage, and the series connection end is connected with a series connection node between the first power tube and the primary side auxiliary winding.
3. The switching power supply circuit according to claim 1 or 2, wherein the self-starting unit is configured to take power from the input voltage to provide a starting voltage of the circuit;
the self-starting unit comprises a starting resistor and a first voltage-stabilizing tube which are arranged in series, one end of the starting resistor is used for being connected with the input voltage, and the series connection end of the starting resistor and the first voltage-stabilizing tube is connected to the control ends of the two power tubes.
4. The switching power supply circuit according to claim 3, wherein the secondary winding of the transformer comprises a secondary main winding and a secondary auxiliary winding, the secondary main winding is connected to the rectifying and filtering unit, the secondary auxiliary winding is connected to the feedback driving unit, and the feedback driving unit is configured to obtain inductive power from the secondary winding and drive the two power tubes to be turned on and off simultaneously;
the feedback driving unit comprises a first switching tube, a charging and discharging electronic unit and a feedback subunit, the sampling unit comprises a sampling resistor, a first end of the secondary auxiliary winding passes through the feedback subunit and then is respectively connected with the double-tube power conversion unit and a first end of the first switching tube, and the first end of the secondary auxiliary winding is also connected with the charging and discharging electronic unit;
the charging and discharging electronic unit is connected with the second end of the first switching tube, and the third end of the first switching tube is connected with a power ground;
the non-series connection end of the first voltage-stabilizing tube and the second end of the secondary auxiliary winding are connected with a power ground through the sampling resistor.
5. The switching power supply circuit according to claim 4, wherein the feedback sub-unit comprises a blocking capacitor and a protection resistor which are arranged in series, and the charge-discharge sub-unit comprises a charging capacitor, a first resistor, a second resistor, a first diode, a second diode and a second voltage regulator tube;
the other end of the blocking capacitor is connected with the first end of the secondary auxiliary winding, and the other end of the protection resistor is respectively connected with the first end of the first switch tube and the serial connection end of the starting resistor and the first voltage-regulator tube;
the second end of the first switch tube is connected with the first end of the charging capacitor, and the second end of the charging capacitor is connected with one end of the sampling unit;
the first end of the charging capacitor is also connected with one end of the first resistor and one end of the second resistor respectively, and the other end of the first resistor, the first diode, the second voltage-regulator tube and the other end of the second resistor are connected in sequence;
and the first end of the secondary auxiliary winding is also connected with the series connection end of the first diode and the second diode.
6. The switching power supply circuit according to claim 1, further comprising: the primary side auxiliary winding comprises a first absorption circuit and a second absorption circuit, wherein the first absorption circuit is connected to two ends of the primary side main winding in parallel, and the second absorption circuit is connected to two ends of the primary side auxiliary winding in parallel.
7. A drive device, comprising: the switching power supply circuit adopts the switching power supply circuit as claimed in any one of claims 1 to 6, the input end of the linear power supply circuit is used for connecting an input voltage, and the output ends of the switching power supply circuit and the linear power supply circuit are connected with the input end of the voltage stabilization output circuit; the voltage stabilizing output circuit is used for being connected with a main power tube to drive the main power tube to be switched on or switched off.
8. The driving device according to claim 7, wherein the linear power circuit comprises a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, a second switch tube, a third power tube and a filter output unit;
the first end of the third power tube is used for connecting the input voltage, the second end of the third power tube is connected with the filtering output unit, and the filtering output unit is also connected with the voltage stabilizing output circuit;
one end of the third resistor is used for connecting the input voltage, and the other end of the third resistor is connected with the fourth resistor and is also connected to the first end of the second switching tube through the fifth resistor;
the second end of the second switch tube is used for being connected with the input voltage, a sixth resistor is arranged between the second end and the third end of the second switch tube, the third end of the second switch tube and the third end of the third power tube are both connected with the first end of the seventh resistor, and the second end of the seventh resistor is connected with the power ground.
9. The driving apparatus according to claim 7, wherein the voltage-stabilizing output circuit comprises an input filtering unit, a first energy-storing capacitor, a voltage-stabilizing protection unit and a second energy-storing capacitor connected in sequence, wherein the voltage-stabilizing protection unit comprises a transient diode and a third voltage-stabilizing tube,
the anode of the transient diode is connected with the anode of the first energy storage capacitor, the cathode of the transient diode is connected with the first end of the third voltage-stabilizing tube, and the second end of the third voltage-stabilizing tube is connected with the cathode of the first energy storage capacitor; the second energy storage capacitor is connected in parallel to two ends of the third voltage regulator tube and is used for being connected with the main power tube.
10. A power electronic power switch, comprising: a main power tube and a power tube driving circuit connected with the main power tube, wherein the power tube driving circuit adopts the driving device as claimed in any one of claims 7 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120839802.7U CN215120579U (en) | 2021-04-22 | 2021-04-22 | Switching power supply circuit, driving device and power electronic power switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120839802.7U CN215120579U (en) | 2021-04-22 | 2021-04-22 | Switching power supply circuit, driving device and power electronic power switch |
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| Publication Number | Publication Date |
|---|---|
| CN215120579U true CN215120579U (en) | 2021-12-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120839802.7U Active CN215120579U (en) | 2021-04-22 | 2021-04-22 | Switching power supply circuit, driving device and power electronic power switch |
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| Country | Link |
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| CN (1) | CN215120579U (en) |
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2021
- 2021-04-22 CN CN202120839802.7U patent/CN215120579U/en active Active
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