A Schottky peak voltage suppression circuit

Abstract

The utility model discloses a kind of inhibit schottky peak voltage circuit, it is related to electronic engineering technical field, including transformer T1, schottky diode D10, RC absorption circuit and rectifier filter circuit, the primary side electrical connection external circuit of transformer T1, the secondary side electrical connection schottky diode D10 and RC absorption circuit of transformer T1, schottky diode D10 and RC absorption circuit are mutually parallel, while schottky diode D10 and RC absorption circuit are all through rectifier filter circuit electrical connection output port.The utility model by introducing RC absorption circuit and diode D11, schottky diode D10 can effectively inhibit the peak voltage generated when shutting down, so that diode D11 and other circuit components can be protected from high voltage impact, while setting resistance parallel circuit in RC absorption circuit, the peak energy stored on capacitor C6 can be slowly released, to further avoid the damage caused by peak voltage to circuit.

Description

TECHNICAL FIELD

[0001] The utility model relates to electronic engineering technical field, concretely is a kind of inhibiting schottky peak voltage circuit. BACKGROUND

[0002] Schottky diode is widely used in switching power supply, inverter and other high-frequency switching circuits due to its low forward voltage drop and fast reverse recovery time. The low forward voltage drop of Schottky diode can significantly reduce the conduction loss and improve the circuit efficiency. However, Schottky diode will produce a high peak voltage due to reverse recovery effect during the off process, which not only may cause damage to the diode itself, but also may affect other circuit components, and even cause the failure of the entire system.

[0003] Currently, to suppress the peak voltage generated by Schottky diode, the most common method is to connect an RC snubber circuit composed of resistance and capacitance in parallel across the Schottky diode. The basic principle of RC snubber circuit is to use the energy storage effect of capacitor and the energy dissipation effect of resistor to absorb and consume the energy of peak voltage. Although this method can alleviate the problem of peak voltage to some extent, there are still some limitations in practical application:

[0004] Limited suppression effect: In some high-frequency switching circuits, RC snubber circuit may not completely and effectively suppress the peak voltage, especially under high frequency and large current conditions, the peak voltage is still high.

[0005] Increased cost: In order to achieve better suppression effect, sometimes the turns ratio of transformer needs to be adjusted or higher voltage Schottky diode is used, which not only increases the complexity of design, but also increases the manufacturing cost.

[0006] Efficiency loss: RC snubber circuit will also produce certain energy loss while absorbing peak voltage, which will affect the efficiency of the entire circuit. INVENTION CONTENTS

[0007] The purpose of the utility model is to provide a kind of inhibiting schottky peak voltage circuit to solve the problems raised in the above background.

[0008] To achieve the above purpose, the utility model provides the following technical scheme: a kind of inhibiting schottky peak voltage circuit, including transformer T1, schottky diode D10, RC snubber circuit and rectifier filter circuit, the primary side of the transformer T1 is electrically connected with external circuit, the secondary side of the transformer T1 is electrically connected with schottky diode D10 and RC snubber circuit, the schottky diode D10 and RC snubber circuit are parallel to each other, and the schottky diode D10 and RC snubber circuit are both electrically connected with output port through rectifier filter circuit simultaneously;

[0009] The RC absorption circuit comprises a diode D11 and a resistor parallel circuit, the diode D11 and the resistor parallel circuit are connected in parallel with each other, the cathode of the diode D11 and the resistor parallel circuit are both electrically connected to a capacitor C6, and the capacitor C6 is electrically connected to a 2-port of a Schottky diode D10 and a rectification filter circuit.

[0010] Further, the rectification filter circuit is connected in parallel with a capacitor C8 and an RC absorption circuit, the rectification filter circuit is grounded, and the capacitor C8 is electrically connected to an output port.

[0011] Further, the rectification filter circuit comprises a capacitor EC3 and a capacitor EC4, the capacitor EC3 and the capacitor EC4 are connected in parallel with each other, and the capacitor EC3 and the capacitor EC4 are both electrically connected to an external circuit.

[0012] Further, the resistor parallel circuit comprises a resistor R30 and a resistor R31, the resistor R30 and the resistor R31 are connected in parallel with each other, and the resistor R30 and the resistor R31 are both electrically connected to a secondary side of a transformer T1, a diode D11 and a capacitor C6.

[0013] Further, the forward conduction voltage of the diode D11 is less than the reverse recovery voltage of the Schottky diode D10.

[0014] Compared with the prior art, the utility model has the advantages that:

[0015] The utility model discloses the RC absorption circuit and diode D11 can effectively suppress the peak voltage produced when the Schottky diode D10 is turned off, so that the diode D11 and other circuit elements can be protected from high voltage impact, and the resistor parallel circuit in the RC absorption circuit can slowly release the peak energy stored in the capacitor C6, thereby further avoiding the damage of the peak voltage to the circuit. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is the circuit diagram of the Schottky peak voltage suppression circuit of the utility model. DETAILED DESCRIPTION

[0017] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0018] REFERENCE Figure 1The embodiment provides a Schottky peak voltage suppression circuit, which comprises a transformer T1, a Schottky diode D10, an RC absorption circuit and a rectification filtering circuit. The primary side of the transformer T1 is electrically connected with an external circuit, the secondary side of the transformer T1 is electrically connected with the Schottky diode D10 and the RC absorption circuit, the Schottky diode D10 and the RC absorption circuit are parallel to each other, and the Schottky diode D10 and the RC absorption circuit are both electrically connected with an output port through the rectification filtering circuit. That is, the Schottky diode D10 is used as a rectifier to convert the alternating current signal on the secondary side of the transformer T1 into a direct current signal. The RC absorption circuit is used to suppress the peak voltage generated by the Schottky diode D10 at the moment of turning off, and the rectification filtering circuit is used to smooth the rectified direct current voltage, reduce the ripple and make the output more stable, that is, the direct current voltage after rectification and filtering is output from the output port 24+ and the output port 24- for use by subsequent circuits.

[0019] In the embodiment, the RC absorption circuit comprises a diode D11 and a resistor parallel circuit, the diode D11 and the resistor parallel circuit are parallel to each other, the cathode of the diode D11 and the resistor parallel circuit are both electrically connected with a capacitor C6, the capacitor C6 is electrically connected with the Schottky diode D10 and the rectification filtering circuit, and the resistor parallel circuit comprises a resistor R30 and a resistor R31, the resistor R30 and the resistor R31 are parallel to each other, and the resistor R30 and the resistor R31 are both electrically connected with the secondary side of the transformer T1, the diode D11 and the capacitor C6. Specifically, the diode D11 can suppress the peak voltage generated by the Schottky diode D10 at the moment of turning off, the capacitor C6 can temporarily store the energy of the peak voltage after the Schottky diode D10 turns off, and the energy stored in the capacitor C6 is released slowly through the resistor parallel circuit, so that the purpose of avoiding damage to the circuit caused by the peak voltage is achieved. That is, the resistor parallel circuit formed by the resistor R30 and the resistor R31 can limit the current of the diode D11 and gradually release the energy stored in the capacitor C6 after the peak voltage disappears. It is worth noting that the forward voltage of the diode D11 is less than the reverse recovery voltage of the Schottky diode D10.

[0020] Further, the rectification filtering circuit is parallel to the RC absorption circuit and grounded, and the capacitor C8 is electrically connected with the output port. Specifically, the rectification filtering circuit comprises a capacitor EC3 and a capacitor EC4, the capacitor EC3 and the capacitor EC4 are parallel to each other, and the capacitor EC3 and the capacitor EC4 are both electrically connected with the external circuit. That is, the capacitor EC3 and the capacitor EC4 are used to smooth the rectified direct current voltage, reduce the ripple and make the output more stable.

[0021] That is, the external circuit receives the input AC signal through the primary side of the transformer T1, and the input AC signal is transmitted to the secondary side through the primary side of the transformer T1, the process of voltage conversion is completed, and the AC signal on the secondary side of the transformer T1 is rectified by the Schottky diode D10 to convert into a pulsating DC signal. Specifically, when the Schottky diode D10 is closed, a sharp voltage may be generated at this time. Then the diode D11 is turned on to guide the sharp voltage to the capacitor C6, and the capacitor C6 temporarily stores the sharp energy. Then the sharp energy stored on the capacitor C6 will be slowly released through the current limiting effect of the resistor R30 and the resistor R31, so that the damage of the sharp voltage to the circuit can be avoided. Further, the pulsating DC signal after rectification and sharp voltage suppression enters the rectification filter circuit, further smooths the DC voltage, reduces the ripple, obtains a stable DC output, and is output through the output port 24+ and the output port 24 for subsequent circuit use.

[0022] Although the embodiments of the present application have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and modifications can be made to these embodiments without departing from the principles and spirits of the present application, and the scope of the present application is defined by the appended embodiments and their equivalents.

Claims

1. A Schottky spike voltage suppression circuit, comprising: The transformer T1, the Schottky diode D10, the RC absorption circuit and the rectifier filter circuit are included, the primary side of the transformer T1 is electrically connected with the external circuit, the secondary side of the transformer T1 is electrically connected with the Schottky diode D10 and the RC absorption circuit, the Schottky diode D10 and the RC absorption circuit are parallel to each other, and the Schottky diode D10 and the RC absorption circuit are both electrically connected with the output port through the rectifier filter circuit. The RC absorption circuit includes a diode D11 and a resistance parallel circuit, the diode D11 and the resistance parallel circuit are parallel to each other, the cathode of the diode D11 and the resistance parallel circuit are both electrically connected with the capacitor C6, the capacitor C6 is electrically connected with the 2-port of the Schottky diode D10 and the rectifier filter circuit.

2. A Schottky spike suppression circuit as defined in claim 1, wherein The rectifier filter circuit is parallel to the capacitor C8 and the RC absorption circuit, the rectifier filter circuit is grounded, and the capacitor C8 is electrically connected with the output port.

3. A circuit for suppressing a Schottky spike voltage according to claim 1 or 2, wherein The rectifier filter circuit includes a capacitor EC3 and a capacitor EC4, the capacitor EC3 and the capacitor EC4 are parallel to each other, and the capacitor EC3 and the capacitor EC4 are both electrically connected with the external circuit.

4. The Schottky peak voltage suppression circuit according to claim 1, characterized in that, The resistance parallel circuit includes a resistance R30 and a resistance R31, the resistance R30 and the resistance R31 are parallel to each other, and the resistance R30 and the resistance R31 are both electrically connected with the secondary side of the transformer T1, the diode D11 and the capacitor C6.

5. The Schottky peak voltage suppression circuit according to claim 1, characterized in that, The forward conduction voltage of the diode D11 is less than the reverse recovery voltage of the Schottky diode D10.

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