阅读说明：本技术 一种推挽型开关电源钳位电路 (Push-pull type switching power supply clamping circuit ) 是由 翁正国 于 2019-11-18 设计创作，主要内容包括：本发明公开一种推挽型开关电源钳位电路,所述电路包括：电源补偿模块、钳位控制模块和功率输出模块；所述电源补偿模块分别与所述钳位控制模块和电源连接,所述电源补偿模块用于在所述电源的电压发生波动时,为所述钳位控制模块提供补偿后的钳位控制电压；所述钳位控制模块与所述功率输出模块连接,所述钳位控制模块通过所述钳位控制电压对所述功率输出模块控制极进行反馈进而控制钳位电压。本发明通过上述电路不仅可以消除推挽型功率输出模块输出端的尖峰脉冲,还可以消除振铃信号,确保推挽型开关电源在功率输出模块输出截止时输出为0而不寄生任何杂散信号,输出的波形是标准的矩形波电压。(The invention discloses a push-pull type switching power supply clamping circuit, which comprises: the power supply compensation module, the clamping control module and the power output module; the power supply compensation module is respectively connected with the clamping control module and the power supply, and is used for providing compensated clamping control voltage for the clamping control module when the voltage of the power supply fluctuates; the clamping control module is connected with the power output module, and feeds back the control electrode of the power output module through the clamping control voltage so as to control the clamping voltage. The invention can eliminate the peak pulse at the output end of the push-pull type power output module and the ringing signal through the circuit, thereby ensuring that the output of the push-pull type switch power supply is 0 without any spurious signal when the output of the power output module is cut off, and the output waveform is standard rectangular wave voltage.)

1. A push-pull switching power supply clamp, the circuit comprising: the power supply compensation module, the clamping control module and the power output module;

the power supply compensation module is respectively connected with the clamping control module and the power supply, and is used for providing compensated clamping control voltage for the clamping control module when the voltage of the power supply fluctuates;

the clamping control module is connected with the power output module, and feeds back a control electrode of the power output module through the clamping control voltage so as to control the clamping output voltage.

2. The push-pull switching power supply clamp circuit of claim 1, wherein the power supply compensation module comprises: the circuit comprises a first resistor, a second resistor, a third resistor, a first voltage stabilizing diode and a first triode;

one end of the first resistor is connected with the power supply, the other end of the first resistor is respectively connected with one end of the second resistor and the cathode of the first voltage-stabilizing diode, and the anode of the first voltage-stabilizing diode is connected with the base electrode of the first triode;

a collector of the first triode is connected with the clamping control module, and an emitter of the first triode is connected with one end of the third resistor;

the other end of the third resistor is connected with the other end of the second resistor.

3. The push-pull switching power supply clamp circuit of claim 2, wherein the clamp control module comprises: the fourth resistor, the fifth resistor, the sixth resistor, the seventh resistor, the eighth resistor, the ninth resistor, the second voltage stabilizing diode, the second triode, the capacitor and the voltage stabilizing reference integrated block;

one end of the fifth resistor is connected with one end of the sixth resistor and the clamping voltage output end respectively, and the other end of the fifth resistor is connected with the collector of the first triode, one end of the fourth resistor and the reference end of the voltage-stabilizing reference integrated block respectively; the clamping voltage output end is a joint of an emitting electrode of the second triode and an output electrode of the power output module;

the other end of the sixth resistor is respectively connected with one end of the seventh resistor and the cathode of the voltage-stabilizing reference integrated block; the other end of the seventh resistor is connected with the base electrode of the second triode; an emitting electrode of the second triode is connected with the clamping voltage output end;

one end of the capacitor and one end of the eighth resistor are both connected with the collector of the second triode; the other end of the capacitor and the other end of the eighth resistor are both connected with one end of the ninth resistor, and are connected with the control end of the power output module and the cathode of the second voltage stabilizing diode; the output electrode of the power output module is connected with the clamping voltage output end;

and the grounding end of the power output module, the other end of the ninth resistor, the anode of the second voltage stabilizing diode and the other end of the fourth resistor are connected, and are connected with the other end of the third resistor and the other end of the second resistor.

4. A push-pull switching power supply clamp circuit according to claim 3 wherein said power output module is a field effect transistor, an IGBT or a combination thereof.

5. A push-pull switching power supply clamp circuit as claimed in claim 3 wherein said clamp voltage calculation formula is:

in the formula: r₄Is the resistance value of the fourth resistor, R₅The resistance value of the fifth resistor, and V is the clamping voltage value.

Technical Field

The invention relates to the technical field of clamping circuits, in particular to a push-pull type switching power supply clamping circuit.

Background

Ultrasonic technology is widely applied in the fields of modern industry, medicine and the like, but still has a plurality of problems at present: 1. the consistency of the ultrasonic vibrators is poor, and the time variability is too large, so that the power ultrasonic waves are difficult to match; 2. in order to obtain high-efficiency high-power output, a digital-driven transformer output mode is generally adopted, and because of transformer leakage inductance, various peaks and ringing voltages which are difficult to eliminate are attached to the waveform of an output power rectangular wave during the cut-off period of a power output module, so that the waveform quality of driving ultrasonic waves is poor, and the system efficiency and the working effect are reduced.

Disclosure of Invention

The invention aims to provide a clamping circuit which can eliminate a spike pulse and a ringing signal.

To achieve the above object, the present invention provides a push-pull type switching power supply clamp circuit, comprising: the power supply compensation module, the clamping control module and the power output module;

the power supply compensation module is respectively connected with the clamping control module and the power supply, and is used for providing compensated clamping control voltage for the clamping control module when the voltage of the power supply fluctuates;

the clamping control module is connected with the power output module, and feeds back a control electrode of the power output module through the clamping control voltage so as to control the clamping output voltage.

Preferably, the power compensation module includes: the circuit comprises a first resistor, a second resistor, a third resistor, a first voltage stabilizing diode and a first triode;

one end of the first resistor is connected with the power supply, the other end of the first resistor is respectively connected with one end of the second resistor and the cathode of the first voltage-stabilizing diode, and the anode of the first voltage-stabilizing diode is connected with the base electrode of the first triode;

a collector of the first triode is connected with the clamping control module, and an emitter of the first triode is connected with one end of the third resistor;

the other end of the third resistor is connected with the other end of the second resistor.

Preferably, the clamping control module includes: the fourth resistor, the fifth resistor, the sixth resistor, the seventh resistor, the eighth resistor, the ninth resistor, the second voltage stabilizing diode, the second triode, the capacitor and the voltage stabilizing reference integrated block;

one end of the fifth resistor is connected with one end of the sixth resistor and the clamping voltage output end respectively, and the other end of the fifth resistor is connected with the collector of the first triode, one end of the fourth resistor and the reference end of the voltage-stabilizing reference integrated block respectively; the clamping voltage output end is a joint of an emitting electrode of the second triode and an output electrode of the power output module;

the other end of the sixth resistor is respectively connected with one end of the seventh resistor and the cathode of the voltage-stabilizing reference integrated block; the other end of the seventh resistor is connected with the base electrode of the second triode; an emitting electrode of the second triode is connected with the clamping voltage output end;

one end of the capacitor and one end of the eighth resistor are both connected with the collector of the second triode; the other end of the capacitor and the other end of the eighth resistor are both connected with one end of the ninth resistor, and are connected with the control end of the power output module and the cathode of the second voltage stabilizing diode; the output electrode of the power output module is connected with the clamping voltage output end;

and the grounding end of the power output module, the other end of the ninth resistor, the anode of the second voltage stabilizing diode and the other end of the fourth resistor are connected, and are connected with the other end of the third resistor and the other end of the second resistor.

Preferably, the power output module is a field effect transistor, an IGBT, or a combination thereof.

Preferably, the clamp voltage calculation formula is:

in the formula: r₄Is the resistance value of the fourth resistor, R₅The resistance value of the fifth resistor, and V is the clamping voltage value.

According to the specific embodiment provided by the invention, the invention discloses the following technical effects:

the power supply compensation module is used for providing compensation for the clamp control voltage, the clamp control module is used for carrying out feedback control on the control end of the power output module, spike pulses and ringing signals are eliminated, and meanwhile, the power supply compensation module is simple in structure, low in cost and easy to operate.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

Fig. 1 is a block diagram of a push-pull switching power supply clamp circuit according to the present invention.

The power supply comprises a power supply compensation module 1, a clamping control module 2 and a power output module 3.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The invention aims to provide a push-pull type switching power supply clamping circuit which is high in efficiency, simple in structure and easy to operate.

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.

As shown in fig. 1, the push-pull type switching power supply clamp circuit of the present invention is connected to a power supply, and includes: the device comprises a power supply compensation module 1, a clamping control module 2 and a power output module 3.

The power supply compensation module 1 is respectively connected with the clamping control module 2 and the power supply, and the power supply compensation module 1 is used for providing compensated clamping control voltage for the clamping control module 2 when the voltage of the power supply fluctuates; the clamping control module 2 is respectively connected to the power output module 3 and the power compensation module 1, and the clamping control module 2 clamps the drain voltage of the power output module 3 through the clamping voltage V __ CTL, so that the drain voltage of the power output module 3 is kept stable.

As an alternative embodiment, the power compensation module 1 of the present invention includes: the circuit comprises a first resistor R1, a second resistor R2, a third resistor R3, a first voltage stabilizing diode DW1 and a first triode Q1.

One end of the first resistor R1 is connected with the power supply through a V __ BAT, the other end of the first resistor R1 is respectively connected with one end of the second resistor R2 and the negative electrode of the first voltage-stabilizing diode DW1, and the positive electrode of the first voltage-stabilizing diode DW1 is connected with the base electrode of the first triode.

The collector of the first transistor Q1 is connected to the clamping control module 2, and the emitter of the first transistor Q1 is connected to one end of the third resistor R3.

The other end of the third resistor R3 is connected with the other end of the second resistor R2.

As an alternative embodiment, the clamp control module 2 of the present invention includes: the voltage stabilizing circuit comprises a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a second triode Q2, a capacitor C1 and a voltage stabilizing reference integrated block IC 1.

Preferably, the IC1 in this embodiment is implemented as a TL431 package.

One end of the fifth resistor R5 is connected to one end of the sixth resistor R6 and the clamping voltage V __ CTL, respectively, and the other end of the fifth resistor R5 is connected to the collector of the first transistor Q1, one end of the fourth resistor R4, and the reference terminal of the voltage regulation reference integrated block IC1, respectively; the CTL end of the clamping voltage V __ is the connection between the emitter of the second transistor Q2 and the drain of the power output module 3.

The other end of the sixth resistor R6 is connected to one end of the seventh resistor R7 and the cathode of the voltage stabilizing reference integrated block IC1, respectively; the other end of the seventh resistor R7 is connected with the base of the second triode Q2; the emitter of the second transistor Q2 is connected to the clamping voltage V __ CTL.

One end of the capacitor C1 and one end of the eighth resistor R8 are both connected to the collector of the second transistor Q2; the other end of the capacitor C1 and the other end of the eighth resistor R8 are both connected to one end of the ninth resistor R9, and are connected to the gate of the power output module 3 and the cathode of the second zener diode; the drain of the power output module 3 is connected to the CTL end of the clamping voltage V __.

The source of the power output module 3, the other end of the ninth resistor R9, the anode of the second zener diode, and the other end of the fourth resistor R4 are all connected, and are connected to the other end of the third resistor R3 and the other end of the second resistor.

The switching power supply clamping circuit has the following specific working principle:

when the voltage of the power supply rises, after the voltage is divided by the first resistor R1 and the second resistor R2, the voltage at the other end of the first resistor R1 rises correspondingly, after the voltage is reduced by the first voltage-stabilizing diode DW1, the voltage is amplified in a reverse phase manner by the first triode Q1, and the voltage at the collector of the first triode Q1 decreases correspondingly; the voltage of the cathode of the voltage stabilizing reference integrated chip IC1 is increased, and the voltage of the gate of the power output module 3 is decreased through the inverse amplification of the second transistor Q2, so that the voltage of the drain of the power output module 3 is increased correspondingly in a compensatory way, namely the clamping voltage V __ CTL is increased; on the contrary, when the voltage of the power supply is reduced, the matching of the clamping voltage V __ CTL and the voltage of the power supply is reduced by the method, and the clamping voltage is correspondingly adjusted according to the voltage change of the power supply.

When the voltage of the power supply is stabilized and the voltage of the V _ CTL is increased due to other reasons, the voltage of the reference terminal of the voltage stabilization reference integrated block IC1 is increased after the voltage division of the fifth resistor R5 and the fourth resistor R4; the voltage of the negative electrode of the voltage-stabilizing reference integrated circuit IC1 is decreased, and is reversely amplified by the second triode Q2, so that the gate voltage of the power output module 3 is increased, and the drain voltage of the power output module 3 is decreased; conversely, when the V _ CTL is lowered due to other reasons, the drain voltage of the power output module 3 is raised by the above method, so that the V _ CTL is kept stable. Therefore, only voltage changes of the power supply trigger synchronous tracking changes of V _ CTL.

Preferably, the power output module 3 is an IGBT, a field effect transistor, or a combination thereof.

Further, the clamping voltage V __ CTL is calculated by the following formula:

in the formula: r₄Is the resistance value of the fourth resistor R4₅Is the resistance value of the fifth resistor R5, and V is the clamping voltage V __ CTL value.

The push-pull type switching power supply clamping circuit disclosed by the invention specifically has the following beneficial effects:

1. not only the spikes of the drain or collector of the power output module 3 are eliminated, but also the ringing signal.

2. Any clamping voltage requirement can be realized by adjusting the fifth resistor R5.

3. The power output module 3 is used as an output final clamping device, and the requirements of high-power and ultrahigh-power clamping are easily met due to convenient heat dissipation.

4. Through the power supply voltage compensation module, the power clamping voltage can be ensured to track the fluctuation of the working power supply and automatically fine-tune the clamping voltage, and the output of the power output module 3 is ensured to be 0 in the cut-off period. Meanwhile, the first resistor R1 can be adapted to any working voltage only by changing, and any working voltage can be matched.

The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.

The principles and embodiments of the present invention are explained herein using specific examples, which are provided only to help understand the circuit and its core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.