CN213461532U - Switching tube series type switching power supply - Google Patents
Switching tube series type switching power supply Download PDFInfo
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- CN213461532U CN213461532U CN202022112277.7U CN202022112277U CN213461532U CN 213461532 U CN213461532 U CN 213461532U CN 202022112277 U CN202022112277 U CN 202022112277U CN 213461532 U CN213461532 U CN 213461532U
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Abstract
The application discloses a switching tube series type switching power supply. The switch tube series type switch power supply comprises serially connected multi-stage switch units, a first-stage switch unit and a last-stage switch unit in the multi-stage switch units are respectively connected with a bus of the switch tube series type switch power supply, each switch unit comprises a main oscillation path based on a switch tube, and the main oscillation path comprises at least one diode. The technical scheme of this application is to switch tube tandem type switching power supply when the generating line voltage sharing again, and the generating line electric capacity can carry out charge-discharge and produce reverse current's problem, adds the diode in the main route of shaking in switch unit of switch tube tandem type switching power supply, has realized blocking to reverse current. The technical scheme has low cost and remarkable effect, can not cause the problems of overheating and the like, and simultaneously has better inhibiting effect on the current oscillation of the switching tube series type switching power supply during normal work.
Description
Technical Field
The application relates to the technical field of power electronics, in particular to a switching tube series type switching power supply.
Background
In the switching tube series type switching power supply, because of the inductance difference between each winding, at the moment of switching on the switching tube, reverse current can appear in the switching tube corresponding to the winding with larger inductance, and the reverse current is too large when the loop impedance is smaller, so that the stress of the switching tube is large and even the switching tube fails. In addition, a continuous oscillation current is generated in the normal working process of the switching tube series switching power supply, which causes large system interference and affects the performance of the switching tube series switching power supply.
SUMMERY OF THE UTILITY MODEL
In view of the above, the present application is made to provide a switching tube series type switching power supply that overcomes or at least partially solves the above problems.
According to an aspect of the present application, there is provided a switching tube series type switching power supply, including a plurality of stages of switching cells connected in series,
the first stage switch unit and the last stage switch unit in the multi-stage switch unit are respectively connected with a bus of the switch tube series type switch power supply,
the switch unit comprises a main oscillation path based on a switch tube, and the main oscillation path comprises at least one diode.
Optionally, the diode is used for blocking reverse current caused by voltage re-equalizing of the bus when the switch tube is conducted.
Optionally, the switching tube is an MOS tube; the switch unit further comprises an MOS tube absorption circuit.
Optionally, the switching unit further comprises a winding and a bus capacitor;
the first end of the winding, the first end of the bus capacitor and the first end of the MOS tube absorption circuit are connected together to form a first end of the switch unit;
the second end of the MOS tube absorption circuit, the second end of the winding and the drain of the MOS tube are connected together;
and the second end of the bus capacitor is connected with the source electrode of the MOS tube to form the second end of the switch unit.
Optionally, the bus capacitor is further connected with a resistor in parallel.
Optionally, the resistance value of the resistor is not greater than a preset value, so as to prevent the switching tube series type switching power supply from being overheated when in use.
Optionally, the diode is specifically disposed between the first end of the MOS transistor absorption circuit and the first end of the winding.
Optionally, the diode is specifically disposed between the drain of the MOS transistor and the second end of the winding.
Optionally, the diode is specifically disposed between the second end of the bus capacitor and the source of the MOS transistor.
Optionally, the switching tube series type switching power supply is a forward converter or a flyback converter.
According to the technical scheme, when the voltage of the bus is equalized again, the bus capacitor can be charged and discharged to generate the reverse current, the diode is added into the main oscillation path in the switch unit of the switch tube series type switch power supply, and the reverse current is blocked. The technical scheme has low cost and remarkable effect, can not cause the problems of overheating and the like, and simultaneously has better inhibiting effect on the current oscillation of the switching tube series type switching power supply during normal work.
The foregoing description is only an overview of the technical solutions of the present application, and the present application can be implemented according to the content of the description in order to make the technical means of the present application more clearly understood, and the following detailed description of the present application is given in order to make the above and other objects, features, and advantages of the present application more clearly understandable.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the application. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
fig. 1 shows a block diagram of a switching tube series type switching power supply according to an embodiment of the present application;
fig. 2 shows a current schematic of a switching tube series type switching power supply according to an embodiment of the present application;
FIG. 3 illustrates a schematic diagram of a MOS transistor absorption circuit according to an embodiment of the present application;
fig. 4 shows a schematic diagram of another MOS transistor absorption circuit according to an embodiment of the present application.
Detailed Description
Exemplary embodiments of the present application will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present application are shown in the drawings, it should be understood that the present application may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
Fig. 1 shows a block diagram of a switching tube series type switching power supply according to an embodiment of the present application. As shown in fig. 1, the switching tube series type switching power supply 100 includes a plurality of stages of switching cells 110 connected in series,
the first stage switching unit and the last stage switching unit in the multi-stage switching unit 110 are respectively connected to a bus bar 120 of the switching tube series type switching power supply,
the switching unit 110 includes a main oscillation path 111 based on a switching tube 112, and the main oscillation path 111 includes at least one diode 113 therein.
Some comparative technical solution examples are given below:
1) and a switching tube with larger current capacity is selected. This solution can improve reliability, but the cost increase is also high. In addition, it cannot solve the problem of an oscillation current existing when the switching tube series type switching power supply is normally used, and the oscillation current may cause an EMC (Electro-Magnetic Compatibility) problem, further affecting the reliability of the switching tube series type switching power supply and surrounding devices.
2) The bus capacitor is connected with the large resistor in parallel to increase power, and the bus capacitor is charged and discharged quickly through the resistor, so that reverse current can be reduced. However, this causes serious heat generation, which leads to a reduction in the efficiency of the switching tube series type switching power supply.
According to the technical scheme of the embodiment of the application, the diode is additionally arranged, reverse current caused by voltage-sharing of the bus is blocked when the switch tube is conducted, the reverse current is cut off, the cost is low, and the effect is obvious. The reliability of the switching tube can be guaranteed, and interference caused by current oscillation can be reduced.
Fig. 2 shows a current schematic of a switching tube series type switching power supply according to an embodiment of the present application. As shown in fig. 2, the switching tube is a MOS tube, and does not need to have a large current capacity to reduce the cost. In other embodiments, the switch tube may also be selected from a triode, an IGBT (Insulated Gate Bipolar Transistor), and the like. The switch unit 110 specifically includes a MOS transistor absorption circuit 210, a bus capacitor C, a diode D (three exemplary positions where the diode D may be disposed are shown in the figure), a winding P, and a MOS transistor Q, where a first end of the winding P, a first end of the bus capacitor C, and a first end of the MOS transistor absorption circuit are connected together to form a first end of the switch unit 110. It should be noted that fig. 2 only shows the first stage switch unit and the last stage switch unit, and the number of the multi-stage switch units 110 connected in series in practical use may be determined according to requirements, which is not limited in this application.
And the second end of the MOS tube absorption circuit, the second end of the winding P and the drain of the MOS tube Q are connected together.
The second end of the bus capacitor C is connected to the source of the MOS transistor Q to form the second end of the switch unit 110.
The connection relationship may be adaptively adjusted according to an actual installation position of the diode D, for example, as illustrated in fig. 2.
The transformer selected by the switching tube series type switching power supply can be a multi-stage series transformer or a transformer with multiple windings. The transformer is connected to the output through the circuit on the right side, and this part can be realized by using the prior art, and the application does not limit this.
In some embodiments, the bus capacitor C is also connected in parallel with a resistor R. In some embodiments, the resistance value of the resistor R is not greater than a predetermined value, so as to prevent the switching tube series type switching power supply from overheating during use. That is, the reverse current is suppressed by only the resistor R, which has the function of voltage equalization and the like, without depending on the resistor.
Several examples of the positions at which the diode D can be arranged are shown in fig. 2. In some embodiments, the diode D is specifically disposed between the first end of the MOS transistor absorption circuit and the first end of the winding P. In other embodiments, the diode D is specifically disposed between the drain of the MOS transistor Q and the second end of the winding. In still other embodiments, the diode D is specifically disposed between the second end of the bus capacitor C and the source of the MOS transistor Q.
Fig. 3 and 4 show examples of two kinds of MOS transistor absorption circuits, respectively. As shown in fig. 3, a resistor and a capacitor are connected in parallel and then connected in series with a diode to absorb the spike of the MOS transistor, wherein the terminal 31 can be connected to the first terminal of the bus capacitor C, the terminal 32 can be connected to the first terminal of the winding P (the anode of the diode D can be connected under the condition that the diode D is arranged between the first terminal of the MOS transistor absorption circuit and the first terminal of the winding P), and the terminal 33 can be connected to the drain of the MOS transistor Q. Fig. 4 is implemented by using a bidirectional TVS (transient voltage suppression) diode, wherein the terminal 41 is connected to the first terminal of the bus capacitor C, the terminal 42 is connected to the first terminal of the winding P (in the case that the diode D is disposed between the first terminal of the MOS transistor absorption circuit and the first terminal of the winding P, the anode of the diode D is connected), and the terminal 43 is connected to the drain of the MOS transistor Q.
In some embodiments, the switching tube series type switching power supply may be embodied as a forward converter or a flyback converter.
The cause of the technical problem is explained with reference to the switching tube series type switching power supply shown in fig. 2. And the bus capacitors C in the switch units are used for sharing the bus voltage before starting. When the switching tube (MOS tube Q) is turned on due to the inductance difference of the windings P of the switching units, the bus capacitors C redistribute the voltage according to the impedance of the windings P. The bus capacitor C corresponding to the winding P with a large impedance is charged, otherwise, the bus capacitor C is discharged, and the charging path is counterclockwise in fig. 2. If the diode D is not provided, when the reverse current is large, the parasitic diode current in the MOS transistor Q may be too large to fail. Even if the normal work can be satisfied, the current oscillation in the operation process can also cause great interference, and particularly causes great interference to EMC, communication and the like.
To sum up, the technical scheme of this application, when voltage-sharing is again gone up at the generating line to the switch tube tandem type switching power supply, the generating line electric capacity can carry out charge-discharge and produce reverse current's problem, adds the diode in the main route of shaking in switch tube tandem type switching power supply's the switch unit, has realized blocking to reverse current. The technical scheme has low cost and remarkable effect, can not cause the problems of overheating and the like, and simultaneously has better inhibiting effect on the current oscillation of the switching tube series type switching power supply during normal work.
While the foregoing is directed to embodiments of the present application, other modifications and variations of the present application may be devised by those skilled in the art in light of the above teachings. It should be understood by those skilled in the art that the foregoing detailed description is for the purpose of better explaining the present application, and the scope of protection of the present application shall be subject to the scope of protection of the claims.
Claims (10)
1. A switching tube series type switching power supply is characterized in that the switching tube series type switching power supply comprises a plurality of stages of switching units which are connected in series,
the first stage switch unit and the last stage switch unit in the multi-stage switch unit are respectively connected with a bus of the switch tube series type switch power supply,
the switch unit comprises a main oscillation path based on a switch tube, and the main oscillation path comprises at least one diode.
2. The switching tube series type switching power supply according to claim 1, wherein the diode is used for blocking a reverse current caused by bus bar re-voltage-sharing when the switching tube is conducted.
3. The switching tube series type switching power supply according to claim 1, wherein the switching tube is an MOS tube; the switch unit further comprises an MOS tube absorption circuit.
4. The switching tube series type switching power supply according to claim 3, wherein the switching unit further comprises a winding and a bus capacitor;
the first end of the winding, the first end of the bus capacitor and the first end of the MOS tube absorption circuit are connected together to form a first end of the switch unit;
the second end of the MOS tube absorption circuit, the second end of the winding and the drain of the MOS tube are connected together;
and the second end of the bus capacitor is connected with the source electrode of the MOS tube to form the second end of the switch unit.
5. The switching tube series type switching power supply according to claim 4, wherein the bus capacitor is further connected in parallel with a resistor.
6. The switching tube series type switching power supply according to claim 5, wherein the resistance value of the resistor is not greater than a predetermined value to prevent the switching tube series type switching power supply from being overheated during use.
7. The switching tube series type switching power supply according to claim 4, wherein the diode is disposed between the first end of the MOS tube absorption circuit and the first end of the winding.
8. The switching tube series type switching power supply according to claim 4, wherein the diode is disposed between the drain of the MOS tube and the second end of the winding.
9. The switching tube series type switching power supply according to claim 4, wherein the diode is disposed between the second end of the bus capacitor and the source of the MOS tube.
10. The switching tube series type switching power supply according to any one of claims 1 to 9, wherein the switching tube series type switching power supply is a forward converter or a flyback converter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022112277.7U CN213461532U (en) | 2020-09-23 | 2020-09-23 | Switching tube series type switching power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022112277.7U CN213461532U (en) | 2020-09-23 | 2020-09-23 | Switching tube series type switching power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213461532U true CN213461532U (en) | 2021-06-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022112277.7U Active CN213461532U (en) | 2020-09-23 | 2020-09-23 | Switching tube series type switching power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213461532U (en) |
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- 2020-09-23 CN CN202022112277.7U patent/CN213461532U/en active Active
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