CN211151832U - Push-pull topology primary side switch MOS tube parallel connection self-adaptive adjusting circuit - Google Patents
Push-pull topology primary side switch MOS tube parallel connection self-adaptive adjusting circuit Download PDFInfo
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- CN211151832U CN211151832U CN201922458302.4U CN201922458302U CN211151832U CN 211151832 U CN211151832 U CN 211151832U CN 201922458302 U CN201922458302 U CN 201922458302U CN 211151832 U CN211151832 U CN 211151832U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
The utility model discloses a push-pull topology primary side switch MOS tube parallel connection self-adaptive adjusting circuit, which comprises an input circuit, an input sampling comparison module and a push-pull output circuit; the input circuit, the input sampling comparison module and the push-pull output circuit are sequentially connected in series; a transformer is arranged between the input sampling comparison module and the push-pull output circuit; a PWM control chip is arranged between the input sampling comparison modules; the input sampling comparison module is provided with a plurality of MOS tubes connected in parallel. Push-pull topology primary side switch MOS pipe parallelly connected self-adaptation adjusting circuit can realize higher transform power when using two or more MOS pipes parallelly connected, also can show the unloaded stand-by power consumption that reduces the power, be favorable to energy saving, promote the power reliability.
Description
Technical Field
The utility model belongs to the technical field of circuit control, concretely relates to parallelly connected self-adaptation regulating circuit of topology primary side switch MOS pipe pushes away.
Background
Among the topologies of switching power supplies, the push-pull topology is one of the most commonly used topologies. When the output power is high, two or more primary side switching MOS tubes need to be connected in parallel to meet the peak current requirement of the primary side. When the switching power supply is fully loaded and output, the use of the multiple MOS tubes is beneficial to improving the conversion efficiency, but when the switching power supply works under light load and no load, the peak current amplitude of the primary side is very small, and the parallel use of two or more MOS tubes can additionally increase the switching loss of the MOS tubes, so that the no-load standby power consumption of the switching power supply is increased. In order to reduce the standby power consumption of the switching power supply, a push-pull topology primary side switching MOS tube is connected in parallel with a self-adaptive adjusting circuit to reduce the switching loss of the switching tube.
In order to solve the technical problem, the utility model provides a push-pull topology primary side switch MOS pipe self-adaptation adjustment circuit that connects in parallel, push-pull topology primary side switch MOS pipe self-adaptation adjustment circuit that connects in parallel can use two or a plurality of MOS pipes parallelly connected, when realizing higher transform power, also can show the unloaded stand-by power consumption of reduction power, be favorable to energy saving, promote the power reliability.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problem, the utility model provides a push-pull topology primary side switch MOS pipe self-adaptation adjustment circuit that connects in parallel can be parallelly connected using two or a plurality of MOS pipes, when realizing higher transform power, also can show the unloaded stand-by power consumption of reduction power, is favorable to energy saving, promotes the power reliability.
The utility model adopts the technical proposal that:
the utility model discloses a push-pull topology primary side switch MOS pipe parallel connection self-adaptive adjusting circuit, which comprises an input circuit, an input sampling comparison module and a push-pull output circuit; the input circuit, the input sampling comparison module and the push-pull output circuit are sequentially connected in series; a transformer is arranged between the input sampling comparison module and the push-pull output circuit; a PWM control chip is arranged between the input sampling comparison modules; the input sampling comparison module is provided with a plurality of MOS tubes connected in parallel.
Further, push-pull topology primary side switch MOS pipe self-adaptation regulator circuit that connects in parallel, input circuit is provided with ground connection ground wire, input circuit is provided with parallelly connected electric capacity.
Furthermore, the utility model discloses a push-pull topology primary side switch MOS pipe connects in parallel self-adaptation regulator circuit, and input sampling comparison module is provided with ground wire; the input sampling comparison module is provided with an operational amplifier.
Further, push-pull topology primary side switch MOS pipe self-adaptation regulator circuit that connects in parallel, PWM control chip sets up between parallelly connected two input sample comparison modules, input sample comparison module is provided with two MOS pipes, two MOS pipes are parallelly connected together.
The utility model has the advantages that: the utility model provides a push-pull topology primary side switch MOS pipe self-adaptation adjustment circuit that connects in parallel can be parallelly connected using two or more MOS pipes, when realizing higher transform power, also can show the unloaded stand-by power consumption that reduces the power, is favorable to energy saving, promotes the power reliability.
Drawings
Fig. 1 is a schematic diagram of an embodiment of a parallel adaptive adjustment circuit of a push-pull topology primary side switch MOS transistor according to the present invention.
Detailed Description
The technical solution in the embodiment of the present invention will be further described with reference to the accompanying drawings. It is to be understood that the embodiments described are only some embodiments of the invention, and not all embodiments.
Example 1:
as shown in fig. 1, the parallel connection self-adaptive adjusting circuit of the push-pull topology primary side switch MOS transistor of the present invention includes an input circuit 1, an input sampling comparing module 2, and a push-pull output circuit 3; the input circuit 1, the input sampling comparison module 2 and the push-pull output circuit 3 are connected in series in sequence; a transformer is arranged between the input sampling comparison module 2 and the push-pull output circuit 3; a PWM control chip 4 is arranged between the input sampling comparison modules 2; the input sampling comparison module 2 is provided with a plurality of MOS tubes connected in parallel.
Further, push-pull topology primary side switch MOS pipe self-adaptation regulator circuit that connects in parallel, input circuit 1 is provided with ground connection ground wire, input circuit 1 is provided with parallelly connected electric capacity.
Furthermore, the utility model discloses a push-pull topology primary side switch MOS pipe connects in parallel self-adaptation regulator circuit, and input sampling comparison module 2 is provided with the ground wire; the input sampling comparison module 2 is provided with an operational amplifier.
Further, push-pull topology primary side switch MOS pipe self-adaptation regulator circuit that connects in parallel, PWM control chip 4 sets up between parallelly connected two input sample comparison module 2, input sample comparison module 2 is provided with two MOS pipes, two MOS pipes are parallelly connected together.
As shown in fig. 1, in this embodiment, two MOS transistors are connected in parallel, and the operating process is as follows, when the switching power supply load is in a full-load state, the peak current of the input circuit 1 is the highest, at this time, the sampling voltage at the current sampling resistor R3 in the input sampling comparison module 2 is the highest, the sampling signal is sampled and held by the diode D2 and the capacitor C7 of the push-pull output circuit 3, and then compared with the voltage division level of VCC by the resistor R2 and the resistor R4 preset in the input sampling comparison module 2, the sampling and holding level is higher than the voltage division level when the switching power supply is in the full-load state, at this time, the operational amplifier U2 outputs a low level, when the PWM control chip NPN 1 outputs a high level, the emitter of the transistor Q2 of the MOS transistor is correspondingly high level, and at this time, the base of the NPN transistor Q2 is low level, the NPN transistor Q2 can be turned on, the PWM control chip U1 can normally drive the NPN transistor Q36, the switching action is completed together.
When the switching power supply load is no-load or light-load, the input peak current of the input circuit 1 is small, the sampling voltage of the current sampling resistor R3 in the input sampling comparison module 2 is low, the sampling signal is sampled and held by the D2 and the C7 of the push-pull output circuit 3 and is lower than the voltage division level of the R2 and the R4 in the input sampling comparison module 2, the operational amplifier U2 outputs high level, when the PWM control chip U1 outputs high level, the emitter and the base of the NPN triode Q2 of the MOS transistor are both high level and cannot form potential difference, the triode NPN Q2 of the MOS transistor cannot be conducted, and at this time, the NPN triode Q3 does not perform switching operation, and only the NPN triode Q1 of the MOS transistor performs switching operation, so that the switching loss of the NPN triode Q3 of the MOS transistor is reduced, and the standby power consumption of the switching power supply is finally reduced.
The utility model provides a push-pull topology primary side switch MOS pipe self-adaptation adjustment circuit that connects in parallel can be parallelly connected using two or more MOS pipes, when realizing higher transform power, also can show the unloaded stand-by power consumption that reduces the power, is favorable to energy saving, promotes the power reliability.
The above embodiments are merely examples for clearly illustrating the present invention, and it is obvious to those skilled in the art that variations or modifications can be made in the above embodiments, and all such variations or modifications are intended to be within the scope of the present invention.
Claims (4)
1. The self-adaptive adjusting circuit is characterized by comprising an input circuit, an input sampling comparison module and a push-pull output circuit, wherein the input sampling comparison module is connected with a switch MOS (metal oxide semiconductor) tube on the primary side of the push-pull topology in parallel; the input circuit, the input sampling comparison module and the push-pull output circuit are sequentially connected in series; a transformer is arranged between the input sampling comparison module and the push-pull output circuit; a PWM control chip is arranged between the input sampling comparison modules; the input sampling comparison module is provided with a plurality of MOS tubes connected in parallel.
2. The push-pull topology primary side switching MOS transistor parallel adaptive adjustment circuit of claim 1, wherein the input circuit is provided with a ground, and the input circuit is provided with a parallel capacitor.
3. The push-pull topology primary side switch MOS tube parallel connection self-adaptive adjusting circuit as claimed in claim 1, wherein the input sampling comparing module is provided with a grounding wire; the input sampling comparison module is provided with an operational amplifier.
4. The push-pull topology primary side switch MOS tube parallel connection self-adaptive adjusting circuit as claimed in claim 1, wherein the PWM control chip is arranged between two input sampling comparison modules which are connected in parallel, the input sampling comparison module is provided with two MOS tubes, and the two MOS tubes are connected in parallel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922458302.4U CN211151832U (en) | 2019-12-30 | 2019-12-30 | Push-pull topology primary side switch MOS tube parallel connection self-adaptive adjusting circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922458302.4U CN211151832U (en) | 2019-12-30 | 2019-12-30 | Push-pull topology primary side switch MOS tube parallel connection self-adaptive adjusting circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211151832U true CN211151832U (en) | 2020-07-31 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922458302.4U Active CN211151832U (en) | 2019-12-30 | 2019-12-30 | Push-pull topology primary side switch MOS tube parallel connection self-adaptive adjusting circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211151832U (en) |
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2019
- 2019-12-30 CN CN201922458302.4U patent/CN211151832U/en active Active
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