CN214045424U - Switching power supply conversion circuit and circuit device - Google Patents
Switching power supply conversion circuit and circuit device Download PDFInfo
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- CN214045424U CN214045424U CN202022326152.4U CN202022326152U CN214045424U CN 214045424 U CN214045424 U CN 214045424U CN 202022326152 U CN202022326152 U CN 202022326152U CN 214045424 U CN214045424 U CN 214045424U
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Abstract
The utility model relates to a switching power supply converting circuit and circuit equipment, switching power supply converting circuit includes: a power supply rectification input circuit; a switching transformer; a power supply rectification output circuit; the voltage control circuit comprises a first switching tube, a second switching tube and a voltage control tube; the control circuit controls the connection and disconnection of the first switching tube through the driving circuit and controls the connection and disconnection of the second switching tube and the voltage control tube; the output end of the bootstrap booster circuit is connected to the driving circuit, and the voltage is increased so as to enable the control end voltage of the first switching tube to be increased through the driving circuit.
Description
Technical Field
The utility model relates to a switching power supply especially relates to a switching power supply converting circuit.
Background
The switch power supply is a DC stabilized power supply made up by using switch power device and using power conversion technique, and possesses the advantages of small volume, light weight, high efficiency, strong adaptability to change of network voltage and frequency, long output voltage holding time and the like, so that it can be extensively used in various terminal equipments and communication equipments which are mainly electronic computer, and is an indispensable power supply for quick development of current electronic information industry. The switching power supply is also called as a high-efficiency energy-saving power supply, an internal circuit works in a high-frequency switching state, the consumed energy is very low, the efficiency of the general power supply can reach about 80 percent, and the efficiency is doubled compared with that of a common linear voltage-stabilized power supply. In the existing industrial frequency-free transformer, the switching power supply still adopts the principle of pulse width modulator PWM or pulse frequency modulator PFM. However, the output voltage of a general switching power supply is low, and the power consumed by the switching tube is large because the internal circuit is often in a high-frequency switching state.
SUMMERY OF THE UTILITY MODEL
In view of the above problem, according to an aspect of the present invention, there is provided a switching power supply converting circuit, comprising: a power supply rectification input circuit; a switching transformer; a power supply rectification output circuit; the voltage control circuit comprises a first switching tube, a second switching tube and a voltage control tube; the control circuit controls the connection and disconnection of the first switching tube through the driving circuit and controls the connection and disconnection of the second switching tube and the voltage control tube; and the output end of the bootstrap booster circuit is connected to the driving circuit, and the voltage is boosted so as to increase the voltage of the control end of the first switching tube through the driving circuit, so that the power consumption of the switching tube is reduced.
Wherein the output terminal of the power supply rectification input circuit is connected to the ground through a first capacitor; a second capacitor is connected between the positive electrode and the negative electrode of the output end of the power supply rectification output circuit; the input terminal of the bootstrap booster circuit is connected to ground through a third capacitor.
The switching power supply conversion circuit further comprises a starting circuit, a first end of the starting circuit is connected to the third capacitor and the bootstrap booster circuit, a second end of the starting circuit is connected to the switching transformer and the first switching tube, and a third end of the starting circuit is connected to the control circuit.
Wherein the power rectification input circuit includes a full-bridge rectification circuit and is connected to the primary coil of the switching transformer, and the power rectification output circuit includes a rectification diode and is connected to the secondary coil of the switching transformer.
The primary coil of the switching transformer is connected to a first end of the first switching tube, a second end of the first switching tube is connected to a first end of the second switching tube, and a second end of the second switching tube is connected to ground.
The first end of the control circuit is connected to the driving circuit, and the second end of the control circuit is connected to the control ends of the second switch tube to control the second switch tube to be switched on and off.
The third end of the control circuit is connected to the starting circuit, the fourth end of the control circuit is connected to the voltage control tube, and the fifth end of the control circuit is connected to the bootstrap booster circuit and the third capacitor.
The first end of the voltage control tube is connected to the bootstrap booster circuit and the third capacitor, and the second end of the voltage control tube is connected between the first switch tube and the second switch tube.
The first end of the driving circuit is connected to the bootstrap booster circuit, the second end of the driving circuit is connected to the control circuit, and the third end of the driving circuit is used as an output end and connected to the control end of the first switching tube.
According to another aspect of the present invention, there is also provided a circuit device comprising a switching power supply conversion circuit according to the above.
Drawings
Fig. 1 shows the operating principle of a switching power supply according to the prior art.
Fig. 2 shows a schematic circuit diagram of a switching power supply conversion circuit according to an embodiment of the present invention.
Fig. 3 shows a specific circuit diagram of a switching power supply conversion circuit according to an embodiment of the present invention.
Detailed Description
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. For the purposes of clarity and conciseness, a detailed description of known functions and configurations incorporated herein will be omitted to avoid obscuring the subject matter of the present invention.
Fig. 1 shows the operation principle of a switching power supply according to the prior art, in which AC220V, 50Hz is input, filtered, rectified by a rectifier bridge and converted into dc, the switching tube in the control circuit is turned on and off to generate low-voltage high-frequency voltage on the primary winding side of the high-frequency transformer, coupled to the secondary winding side by the low-power high-frequency transformer, and rectified and filtered to obtain dc voltage output.
The output voltage range of the switching power supply is small, and the power consumption of the switching tube is overlarge due to frequent switching of the switching tube in the control circuit.
In order to solve the technical problem, the utility model provides a direct current switch power supply converting circuit, include: transformer, an input circuit, an output circuit and related circuits. The input circuit and the output circuit are coupled through a transformer. As shown in fig. 2, the input circuit includes an alternating voltage (e.g., AC220V, 50Hz alternating current) input and a full bridge rectifier. The ac voltage input is rectified by a full bridge rectifier, connected to ground in one branch via a capacitor (e.g., first capacitor C1), and fed into the primary winding of the transformer in the other branch. On the secondary coil side of the transformer corresponding to the primary coil side, the induced current output generated flows out after being rectified by a diode. A capacitor (e.g., a second capacitor C2) is provided between the positive and negative poles of the power supply output terminal.
The related circuit comprises a starting circuit, a bootstrap booster circuit, a driving circuit, a control circuit and a switching tube circuit. The switching tube circuit comprises a first switching tube as a main switching tube, a second switching tube as an auxiliary switching tube and a voltage switching tube. The first switching tube and the second switching tube are connected to the ground in series from the primary coil side of the transformer. One end of the voltage switching tube is connected to the connection point of the first switching tube and the second switching tube, and the other end of the voltage switching tube is connected to the ground through a capacitor (e.g., a third capacitor C3). One end of the capacitor and one end of the voltage control tube are connected to the input end of the bootstrap booster circuit, the output end of the bootstrap booster circuit is connected to the input end of the driving circuit, the output end of the driving circuit is connected to the control end of the first switch tube, when the first switch tube is a triode, the control end is a base electrode, and when the first switch tube is an MOS tube, the control end is a grid electrode. The bootstrap booster circuit and the driving circuit are respectively controlled by the control circuit, and the control circuit is also directly connected to the control ends of the voltage control tube and the second switch tube respectively, that is, the control circuit also directly controls the conduction and the disconnection of the voltage control tube and the second switch tube respectively. Similar to the first switching tube described above, when the voltage control tube and the second switching tube are triodes, the control terminals of the voltage control tube and the second switching tube are respectively bases, and when the voltage control tube and the second switching tube are MOS tubes, the control terminals of the voltage control tube and the second switching tube are respectively gates. The control circuit also controls a starting circuit, the starting circuit is controlled by the control circuit, one end of the starting circuit is output to a node between the transformer and the first switching tube, and the other end of the starting circuit is connected to the ground through a third capacitor. The starting circuit is used for providing starting current when the circuit is started.
As can be seen from the above circuit structure, the control circuit controls the connection and disconnection of the first switch tube, the second switch tube and the voltage control tube, the input rectification circuit is connected with the output rectification circuit through the transformer, the input rectification circuit is connected with the transformer, the transformer is connected with the first switch tube, the first switch tube is connected with the second switch tube, the second switch tube is grounded, an intermediate node between the first switch tube and the second switch tube is connected to D1, D1 is connected to the third capacitor C3, the third capacitor C3 is grounded, the control circuit is connected to the third capacitor, the bootstrap voltage boost circuit is connected to the third capacitor, and the starting circuit is connected to the third capacitor.
Therefore, the utility model discloses a power supply has control circuit and the bootstrap boost circuit that is connected with it in the switching power supply converting circuit, and switching power supply converting circuit utilizes control circuit to produce the PWM signal and goes controlling switching on and breaking off of first switch tube (promptly, main switch pipe) and second switch tube (promptly, auxiliary switch pipe) after starting through starting circuit. When the second switch tube is switched from on to off, the first switch tube is still in an on state. At this time, through the first switch tube and D1, the third capacitor C3 is charged and Q3 is turned on to charge the C4, when the third capacitor C3 is charged to a certain voltage, the voltage of C4 is increased to a certain voltage, and the control circuit sends an off signal to the first switch tube through Q2 to turn off the first switch tube. During the period of time that the first switch tube and the second switch tube are turned off, a certain voltage is maintained across the third capacitor C3. Since the lower end of the third capacitor C3 is grounded, the upper end of the third capacitor C3 maintains a certain positive voltage. When the third capacitor C3 discharges, the third capacitor C3 charges the C4 via the D1 and also discharges the driving circuit Q1 to the first switch tube, i.e., provides energy for turning on and off the first switch tube, thereby increasing the voltage of the driving circuit OUT and achieving the purpose of reducing the switching power of the first switch tube.
Fig. 3 shows a specific circuit diagram of a switching power supply conversion circuit according to an embodiment of the present invention. In particular, fig. 3 shows a specific circuit diagram of the bootstrap booster circuit, the driving circuit and the voltage control tube. As shown in fig. 3, the bootstrap boost circuit may be constituted, for example, by a diode D2, a transistor Q3, and a fourth capacitor C4. One end of the diode D2 is connected to one end of the starting circuit, the other end of the diode D2 is connected to one end of the fourth capacitor C4, and the other end of the fourth capacitor C4 is connected to ground. Meanwhile, one end of the diode D2 connected to the capacitor is connected to the drain of the transistor Q3. The gate of transistor Q3 is connected to and controlled by the control circuit. The source of transistor Q3 is connected to one end of a voltage control tube, which may be implemented, for example, as diode D1.
As shown in fig. 3, the drive circuit may be constituted by, for example, a transistor Q1 and a transistor Q2. The source of the transistor Q1 is connected to the drain of the transistor Q2 and to the main switching tube to control the turn-off of the main switching tube. The gate of the transistor Q1 and the gate of the transistor Q2 are connected to each other and are commonly connected to the control circuit to be controlled thereby. A drain of the transistor Q1 is connected to the bootstrap boost circuit, specifically, a drain of the transistor Q1 is connected to a drain of the transistor Q3, and to a node between the diode D2 and the fourth capacitor C4. The drain of transistor Q2 is connected to ground. Further, the drain of the transistor Q3 in the bootstrap boosting circuit and the drain of the transistor Q1 in the driving circuit are commonly connected to the power supply voltage VCC.
To sum up, the embodiment of the present invention provides a switching power supply converting circuit, which includes: the power supply rectification circuit comprises a power supply rectification input circuit, a switching transformer, a power supply rectification output circuit, a first switching tube, a second switching tube, a voltage control tube, a control circuit, a bootstrap booster circuit and a driving circuit. According to the utility model discloses power supply has control circuit and the bootstrap boost circuit that is connected with it in the switching power supply converting circuit, and switching power supply converting circuit utilizes control circuit to produce PWM signal after starting through starting circuit and goes control bootstrap boost circuit and drive circuit, and then controls switching on and breaking off of first switch tube (promptly, main switch tube) and second switch tube (promptly, auxiliary switch tube). The output end of the bootstrap booster circuit is connected to the driving circuit, and the voltage is boosted to enable the voltage of the control end of the first switching tube to be boosted through the driving circuit, so that the voltage is boosted, the switching power of the first switching tube is reduced, \ 31885and the power consumption is reduced, and the switching efficiency is improved.
According to the utility model discloses on the other hand of the embodiment, still provide a circuit equipment, it includes according to the switching power supply converting circuit described above
It should be noted that the technical solutions described in the embodiments of the present invention can be combined arbitrarily without conflict.
In the embodiments provided in the present disclosure, it should be understood that the disclosed method and apparatus may be implemented in other manners. The above-described device embodiments are merely illustrative, for example, the division of the unit is only a logical functional division, and there may be other division ways in actual implementation, such as: multiple units or components may be combined, or may be integrated into another system, or some features may be omitted, or not implemented. In addition, the coupling, direct coupling or communication connection between the components shown or discussed may be through some interfaces, and the indirect coupling or communication connection between the devices or units may be electrical, mechanical or other forms.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed on a plurality of network units; some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, each functional unit in each embodiment of the present invention may be integrated into one unit, or each unit may be separately regarded as one unit, or two or more units may be integrated into one unit; the integrated unit can be realized in a form of hardware, or in a form of hardware plus a software functional unit.
The above description is only for implementing the embodiments of the present invention, and those skilled in the art should understand that any modification or partial replacement without departing from the scope of the present invention should fall within the scope defined by the claims of the present invention, and therefore, the protection scope of the present invention should be subject to the protection scope of the claims.
Claims (10)
1. A switching power supply converting circuit, comprising:
a power supply rectification input circuit;
a switching transformer;
a power supply rectification output circuit;
the voltage control circuit comprises a first switching tube, a second switching tube and a voltage control tube;
the control circuit controls the connection and disconnection of the first switching tube through the driving circuit and controls the connection and disconnection of the second switching tube and the voltage control tube;
the output end of the bootstrap booster circuit is connected to the driving circuit, and the voltage is increased so as to enable the control end voltage of the first switching tube to be increased through the driving circuit.
2. The switching power supply converting circuit according to claim 1, characterized in that:
the output end of the power supply rectification input circuit is connected to the ground through a first capacitor; a second capacitor is connected between the positive electrode and the negative electrode of the output end of the power supply rectification output circuit; the input terminal of the bootstrap booster circuit is connected to ground through a third capacitor.
3. The switching power converter circuit according to claim 1, further comprising a start circuit, wherein a first terminal of the start circuit is connected to a third capacitor and the bootstrap voltage boost circuit, a second terminal of the start circuit is connected to the switching transformer and the first switching tube, and a third terminal of the start circuit is connected to the control circuit.
4. The switching power supply converting circuit according to claim 1, characterized in that: the power supply rectification input circuit comprises a full-bridge rectification circuit and is connected to the primary coil of the switching transformer, and the power supply rectification output circuit comprises a rectification diode and is connected to the secondary coil of the switching transformer.
5. The switching power supply converting circuit according to claim 1, characterized in that: the primary coil of the switching transformer is connected to a first end of the first switching tube, a second end of the first switching tube is connected to a first end of the second switching tube, and a second end of the second switching tube is connected to ground.
6. The switching power supply converting circuit according to claim 3, characterized in that: the first end of the control circuit is connected to the driving circuit, and the second end of the control circuit is connected to the control ends of the second switch tube to control the second switch tube to be switched on and off.
7. The switching power supply converting circuit according to claim 6, characterized in that: the third end of the control circuit is connected to the starting circuit, the fourth end of the control circuit is connected to the voltage control tube, and the fifth end of the control circuit is connected to the bootstrap booster circuit and the third capacitor.
8. The switching power supply converting circuit according to claim 1, characterized in that: the first end of the voltage control tube is connected to the bootstrap booster circuit and the third capacitor, and the second end of the voltage control tube is connected between the first switch tube and the second switch tube.
9. The switching power supply converting circuit according to claim 1, characterized in that: the first end of the driving circuit is connected to the bootstrap booster circuit, the second end of the driving circuit is connected to the control circuit, and the third end of the driving circuit is used as an output end and connected to the control end of the first switching tube.
10. A circuit arrangement comprising a switching power converter circuit according to any one of claims 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022326152.4U CN214045424U (en) | 2020-10-19 | 2020-10-19 | Switching power supply conversion circuit and circuit device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022326152.4U CN214045424U (en) | 2020-10-19 | 2020-10-19 | Switching power supply conversion circuit and circuit device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214045424U true CN214045424U (en) | 2021-08-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022326152.4U Active CN214045424U (en) | 2020-10-19 | 2020-10-19 | Switching power supply conversion circuit and circuit device |
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| Country | Link |
|---|---|
| CN (1) | CN214045424U (en) |
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- 2020-10-19 CN CN202022326152.4U patent/CN214045424U/en active Active
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