CN215528877U - Instantaneous drive circuit of switching tube - Google Patents
Instantaneous drive circuit of switching tube Download PDFInfo
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- CN215528877U CN215528877U CN202120719624.4U CN202120719624U CN215528877U CN 215528877 U CN215528877 U CN 215528877U CN 202120719624 U CN202120719624 U CN 202120719624U CN 215528877 U CN215528877 U CN 215528877U
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Abstract
The utility model relates to a switching tube instantaneous driving circuit which comprises a transformer T1, a diode D5, a voltage regulator tube D6, a capacitor C5, a resistor R1 and a resistor R2. The input signal of the switch tube instantaneous drive circuit directly comes from an overturning signal which is coupled to the auxiliary winding by the transformer T1, the signal is processed to drive and control the switch tube of the secondary active clamp, the secondary active clamp is realized, the problem of stress peak of the secondary rectifier tube of a product in the startup and shutdown process is solved, and meanwhile, the capacitor of the switch tube instantaneous drive circuit can also adjust parameters to ensure that the original switch tube drive circuit is not influenced.
Description
Technical Field
The utility model relates to the field of forward active clamping circuits, in particular to a switching tube instantaneous driving circuit.
Background
In the secondary side rectifying circuits of all switching power converters, both diode rectification and synchronous rectifier tube rectification have a problem, namely, in the secondary side rectifying process, because leakage inductance of a transformer and parasitic junction capacitance of a rectifier tube generate resonance, the resonance can occur when the rectifier tube is turned off, and the leakage inductance and the junction capacitance cannot be eliminated.
Fig. 1 is a schematic diagram of a forward active clamp circuit using positive logic control, when a primary side main power switch TR1 is turned on, a diode D2 and a diode D3 on a secondary side are turned on, and a diode D1 and a diode D4 are turned off due to voltage reversal at two ends of a transformer T1, at this time, a series resonance is formed because a leakage inductance existing in the transformer, a junction capacitor of a diode D1 and a diode D4 form a series loop, and a very high peak is generated at two ends of the junction capacitor, that is, two turned-off diodes D1 and a diode D4 and the leakage inductance generate resonance; also in the latter half cycle, the same spike occurs when diode D2 and diode D3 turn off. Fig. 2 is a schematic diagram of a forward active clamp circuit using negative logic control, and the process of generating spikes is similar to fig. 1.
In the prior art, a secondary side active clamping mode is generally adopted to eliminate a peak generated in a resonance process, and as shown in fig. 1, the secondary side active clamping mode is simple, namely a clamping capacitor and a switching tube are added. However, the input end of the conventional switching tube driving circuit is derived from a chip driving signal, and drives the switching tube after multi-stage processing, and in the process of switching on and switching off, because the power supply of the switching tube driving circuit is not established or the driving processing is delayed, the conventional switching tube driving circuit is delayed or fails at the moment of switching on and switching off, so that the stress spike of the secondary rectifier tube cannot be clamped.
SUMMERY OF THE UTILITY MODEL
Therefore, the utility model provides a switching tube instantaneous driving circuit, which drives a switching tube of a secondary side active clamping circuit at the moment of switching on and switching off a product, and effectively solves the problem of stress peak of a secondary side rectifying tube in the switching on and switching off process of the product.
The utility model is realized by the following technical scheme:
the utility model provides a switch tube instantaneous drive circuit, the switch tube of the active clamp circuit of secondary limit of the instantaneous drive of product switching on and shutting down which characterized in that: the driving circuit comprises a transformer T1, a diode D5, a voltage regulator tube D6, a capacitor C5, a resistor R1 and a resistor R2, wherein the different name end of an auxiliary winding of the transformer T1 is connected with the anode of the diode D5, the cathode of the diode D5 is connected with one end of a capacitor C5 and one end of the resistor R1, the other end of the capacitor C5 and the other end of the resistor R1 are connected with one end of a resistor R2, the other end of the resistor R2 is connected with the cathode of the voltage regulator tube D6, a driving signal V1 is output at the same time, and the anode of the voltage regulator tube D6 is connected with a driving reference ground and the same name end of the auxiliary winding of the transformer T1.
The utility model provides a switch tube instantaneous drive circuit, the switch tube of the active clamp circuit of secondary limit of the instantaneous drive of product switching on and shutting down which characterized in that: the driving circuit comprises a transformer T1, a diode D5, a voltage regulator tube D6, a capacitor C5, a resistor R1 and a resistor R2, wherein the dotted terminal of an auxiliary winding of the transformer T1 is connected with the cathode of the diode D5, the anode of the diode D5 is connected with one end of a capacitor C5 and one end of the resistor R1, the other end of the capacitor C5 and the other end of the resistor R1 are connected with one end of a resistor R2, the other end of the resistor R2 is connected with the anode of the voltage regulator tube D6, a driving signal V1 is output at the same time, and the cathode of the voltage regulator tube D6 is connected with a driving reference ground and the dotted terminal of the auxiliary winding of the transformer T1.
The conception of the utility model is as follows:
because the resonance capacitor is too small, namely the junction capacitor of the secondary rectifier tube is too small, the voltage peak when the secondary rectifier tube is turned off can be reduced by increasing the resonance capacitor when resonance occurs, and according to the resonance principle, the larger the resonance capacitor is, the smaller the voltage at the two ends of the resonance capacitor is. The utility model uses the auxiliary winding of the transformer to couple the turning signal corresponding to the primary side switch signal, processes it through the capacitor, the resistor and the voltage-stabilizing tube, then drives the switch tube of the secondary side active clamping circuit, and connects the clamping capacitor into the resonance circuit, so that the voltage is reduced during resonance, the stress of the rectifier tube is reduced, the lossless absorption is realized, and the capacitor of the switch tube instantaneous drive circuit can not affect the original switch tube drive circuit through adjusting the parameter.
The working principle of the present invention will be described in detail later with reference to specific embodiments, which are not described herein, and compared with the prior art, the present invention has the following beneficial effects:
1. the utility model realizes the optimization of the prior secondary active clamping scheme, effectively solves the problem of stress peak of the secondary rectifier tube in the startup and shutdown process of the product, and has obvious effect and low cost;
2. the utility model is only used for switching on and switching off, and the original switching tube driving circuit can not be influenced by adjusting the parameter of the capacitor of the switching tube instantaneous driving circuit.
Description of the drawings:
FIG. 1 is a schematic diagram of a forward active clamp circuit using positive logic control;
FIG. 2 is a schematic diagram of a forward active clamp circuit using negative logic control;
FIG. 3 is a first embodiment of the switching tube transient driving circuit of the present invention;
FIG. 4 shows a second embodiment of the switching tube instant driving circuit of the present invention.
Detailed Description
The technical scheme of the utility model is more clearly and completely described below by combining the attached drawings in the embodiment of the utility model. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and are not intended to limit the utility model.
First embodiment
As shown in fig. 3, which is a schematic diagram of the first embodiment of the present invention, the switching tube instantaneous driving circuit includes a transformer T1, a diode D5, a voltage regulator tube D6, a capacitor C5, a resistor R1 and a resistor R2, the synonym terminal of the auxiliary winding of the transformer T1 is connected to the anode of the diode D5, the cathode of the diode D5 is connected to one end of a capacitor C5 and one end of a resistor R1, the other end of the capacitor C5 and the other end of the resistor R1 are connected to one end of a resistor R2, the other end of the resistor R2 is connected to the cathode of the voltage regulator tube D6, and a driving signal V1 is output, and the anode of the voltage regulator tube D6 is connected to a driving reference ground and the synonym terminal of the auxiliary winding of the transformer T1.
The switching tube instantaneous driving circuit of the embodiment couples out the turning signal corresponding to the primary side switching signal by using the auxiliary winding of the transformer T1, processes the turning signal through the capacitor C5, the resistor R1 and the voltage regulator tube D6, then drives the switching tube TR3 of the secondary side active clamping circuit, and connects the clamping capacitor C3 in series into the resonant circuit, so that the voltage is reduced during resonance, the stress of the secondary side rectifying tube is reduced, the problem of stress spike of the secondary side rectifying tube in the startup and shutdown process of the product is solved, and lossless absorption is realized.
The working principle of the embodiment is explained as follows:
when the coupling voltage of the same-name end of the secondary winding of the transformer T1 is positive, the diode D5 is cut off, and the capacitor C5 discharges through the resistor R1; when the coupling voltage of the synonym terminal of the secondary winding of the transformer T1 is positive, the diode D5 is conducted, the capacitor C5 starts to be charged, and the voltage of the driving signal V1 is stabilized by the voltage stabilizing tube D6 to obtain a positive voltage. The driving signal V1 can drive an NMOS transistor or other positive voltage logic switch transistor.
Second embodiment
As shown in fig. 4, which is a schematic diagram of a second embodiment of the present invention, the switching tube instantaneous driving circuit includes a transformer T1, a diode D5, a voltage regulator tube D6, a capacitor C5, a resistor R1 and a resistor R2, the dotted terminal of the auxiliary winding of the transformer T1 is connected to the cathode of the diode D5, the anode of the diode D5 is connected to one end of a capacitor C5 and one end of a resistor R1, the other end of the capacitor C5 and the other end of the resistor R1 are connected to one end of a resistor R2, the other end of the resistor R2 is connected to the anode of the voltage regulator tube D6, and a driving signal V1 is output, and the cathode of the voltage regulator tube D6 is connected to a driving reference ground and the dotted terminal of the auxiliary winding of the transformer T1.
The operation principle of this embodiment is similar to that of the first embodiment, and is explained as follows:
when the coupling voltage of the same-name end of the secondary winding of the transformer T1 is positive, the diode D5 is cut off, and the capacitor C5 discharges through the resistor R1; when the coupling voltage of the synonym terminal of the secondary winding of the transformer T1 is positive, the diode D5 is conducted, at the moment, the capacitor C5 starts to charge, and the voltage of the driving signal V1 is stabilized by the voltage stabilizing tube D6 to obtain a negative voltage. The driving signal V1 can drive a PMOS transistor or other negative voltage logic switch transistor.
The above are merely preferred embodiments of the present invention, and those skilled in the art can change or modify the above-described embodiments. Therefore, the present invention is not limited to the specific control modes disclosed and described above, and modifications and variations of the present invention are also intended to fall within the scope of the claims of the present invention.
Claims (2)
1. The utility model provides a switch tube instantaneous drive circuit, the switch tube of the active clamp circuit of secondary limit of the instantaneous drive of product switching on and shutting down which characterized in that: the driving circuit comprises a transformer T1, a diode D5, a voltage regulator tube D6, a capacitor C5, a resistor R1 and a resistor R2, wherein the different name end of an auxiliary winding of the transformer T1 is connected with the anode of the diode D5, the cathode of the diode D5 is connected with one end of a capacitor C5 and one end of the resistor R1, the other end of the capacitor C5 and the other end of the resistor R1 are connected with one end of a resistor R2, the other end of the resistor R2 is connected with the cathode of the voltage regulator tube D6, a driving signal V1 is output at the same time, and the anode of the voltage regulator tube D6 is connected with a driving reference ground and the same name end of the auxiliary winding of the transformer T1.
2. The utility model provides a switch tube instantaneous drive circuit, the switch tube of the active clamp circuit of secondary limit of the instantaneous drive of product switching on and shutting down which characterized in that: the driving circuit comprises a transformer T1, a diode D5, a voltage regulator tube D6, a capacitor C5, a resistor R1 and a resistor R2, wherein the dotted terminal of an auxiliary winding of the transformer T1 is connected with the cathode of the diode D5, the anode of the diode D5 is connected with one end of a capacitor C5 and one end of the resistor R1, the other end of the capacitor C5 and the other end of the resistor R1 are connected with one end of a resistor R2, the other end of the resistor R2 is connected with the anode of the voltage regulator tube D6, a driving signal V1 is output at the same time, and the cathode of the voltage regulator tube D6 is connected with a driving reference ground and the dotted terminal of the auxiliary winding of the transformer T1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120719624.4U CN215528877U (en) | 2021-04-09 | 2021-04-09 | Instantaneous drive circuit of switching tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120719624.4U CN215528877U (en) | 2021-04-09 | 2021-04-09 | Instantaneous drive circuit of switching tube |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215528877U true CN215528877U (en) | 2022-01-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120719624.4U Active CN215528877U (en) | 2021-04-09 | 2021-04-09 | Instantaneous drive circuit of switching tube |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215528877U (en) |
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2021
- 2021-04-09 CN CN202120719624.4U patent/CN215528877U/en active Active
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