Suppression circuit of super-junction MOS (Metal Oxide Semiconductor) tube

Abstract

The utility model discloses a suppression circuit of a super junction MOS tube, the suppression circuit is connected to the output end of a bridge rectifier circuit BD1, the suppression circuit is respectively connected with a capacitor C15, a polar capacitor C5 and a polar capacitor C7 in parallel, the negative electrode ends of the polar capacitor C5 and the polar capacitor C7 are both grounded PGND, the suppression circuit is arranged close to a main winding T1A of a transformer, and the suppression circuit comprises a capacitor C6 and a resistor R7, the first end of the capacitor C6 is connected to the first end of a primary coil of the main winding T1A, the second end of the capacitor C6 is connected with the first end of the resistor R7, and the second end of the resistor R7 is grounded PGND. According to the suppression circuit, an existing industrial power supply circuit is optimized, a resistor of 5-100 ohms is connected to a high-voltage ceramic capacitor in series, and the suppression effect is improved. The suppression circuit must be close to the main winding of the transformer, so that the suppression effect is better.

Description

Technical Field

[0001] The utility model relates to a suppression circuit, in particular to a suppression circuit for a super junction MOS tube. Background Art

[0002] Super junction MOS tube is a type of MOS tube. The super junction structure of super junction MOS tube breaks the silicon limit. Compared with traditional technology, on-resistance is reduced by 80%-90% on the same chip area and has high switching speed.

[0003] The advantages of super junction MOS tubes are high efficiency and low cost, but the disadvantage is that radiation is difficult. In this case, in order to solve the temperature rise, most people choose super junction MOS tubes above 90W.

[0004] At present, the price of gallium nitride is not competitive. Super junction MOS tubes can solve the temperature rise problem that planar MOS cannot solve, but they also bring radiation problems that are more difficult than planar MOS. Normally, people will add a 10nF ceramic capacitor between the main electrolytic capacitors after the rectifier bridge. This capacitor is mainly used to filter out some high-frequency interference. This will have a certain effect on planar MOS, but when using super junction MOS tubes, such suppression can no longer better solve the radiation problem.

[0005] In view of this, it is necessary to improve the suppression circuit of the existing super junction MOS tube. Utility Model Content

[0006] In view of the deficiencies in the prior art, the technical problem to be solved by the utility model is to provide a suppression circuit for a super junction MOS tube, and the purpose of designing the suppression circuit is to improve the suppression effect.

[0007] In order to solve the above technical problems, the utility model is implemented through the following scheme: a suppression circuit of a super junction MOS tube of the utility model is connected to the output end of a bridge rectifier circuit BD1, and is respectively connected in parallel with a capacitor C15, a polar capacitor C5, and a polar capacitor C7, and the negative ends of the polar capacitor C5 and the polar capacitor C7 are both grounded PGND. The suppression circuit is arranged close to the main winding T1A of the transformer, and includes a capacitor C6 and a resistor R7. The first end of the capacitor C6 is connected to the first end of the primary coil of the main winding T1A, the second end of the capacitor C6 is connected to the first end of the resistor R7, and the second end of the resistor R7 is grounded PGND.

[0008] Furthermore, the capacitor C6 is a high-voltage ceramic capacitor capable of filtering high-frequency interference.

[0009] Furthermore, the capacitor C6 is a capacitor with a specification of 1nf-50nf 1KV.

[0010] Furthermore, the resistor R7 is a chip resistor with a resistance range of 5Ω-100Ω.

[0011] Further, the output end of the bridge rectifier circuit BD1 is connected to the first end of the primary coil of the main winding T1A and the first end of the resistor R15, and the resistor R15 is respectively connected in parallel with a resistor R16, a resistor R17, and a capacitor C8;

[0012] The second end of the resistor R15 is connected to the first end of the resistor R3, and the resistor R3 is connected in parallel with a resistor R33 and a resistor R18;

[0013] The second end of the resistor R3 is connected to the cathode end of the diode D6 , and the anode end of the diode D6 is connected to the second end of the primary coil of the main winding T1A.

[0014] Furthermore, the input end of the bridge rectifier circuit BD1 is connected to the second inductance circuit LF2 , the input end of the second inductance circuit LF2 is connected to the first inductance circuit LF1 , and the first inductance circuit LF1 is connected to a power supply.

[0015] Furthermore, both AC ends of the bridge rectifier circuit BD1 are connected to photoresistors, whose negative electrodes are grounded PGND, and the other ends of the two photoresistors are connected one-to-one to the two output pins of the second inductor circuit LF2, and the two output pins of the second inductor circuit LF2 are connected one-to-one to the positive ends of the two diodes, and the negative electrodes of the two diodes are connected to the first end of the resistor R9 after being connected to each other, and the second end of the resistor R9 is connected to the first end of the resistor R10, and the second end of the resistor R10 is connected to the PWM circuit.

[0016] Compared with the prior art, the beneficial effects of the utility model are:

[0017] 1. The suppression circuit of the utility model has good radiation suppression effect and low cost.

[0018] 2. The suppression circuit components of the utility model are simple to supply and easy to purchase. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The utility model is a protection circuit for accessing a power supply.

[0020] Figure 2 This is the bridge rectifier circuit diagram of the utility model.

[0021] Figure 3 This is the PWM circuit diagram of the utility model.

[0022] Figure 4 This is a circuit diagram of the secondary coil connection of the transformer T1B of the utility model.

[0023] Figure 5 This is a circuit diagram of the secondary coil connection of the transformer T1A of the utility model.

[0024] Figure 6 This is the output circuit after inductor filtering of the utility model.

[0025] Figure 7 This is the feedback circuit diagram of the utility model. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model, so that the advantages and features of the utility model can be more easily understood by those skilled in the art, thereby making a clearer and more explicit definition of the protection scope of the utility model. Obviously, the embodiments described in the utility model are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0027] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0028] Embodiment 1, the specific structure of the utility model is as follows:

[0029] Please refer to the attached Figure 1-7 ,Will Figure 1-7 The general diagram of the industrial power supply circuit of the utility model is formed by connecting AA, BB, CC, DD, EE, FF, GG, HH, II, and JJ, wherein a suppression circuit is provided in the front-stage circuit of the main winding T1A.

[0030] The utility model discloses a suppression circuit for a super junction MOS tube, which is connected to the output end of a bridge rectifier circuit BD1, wherein the bridge rectifier circuit BD1 rectifies AC into DC, and is respectively connected in parallel with a capacitor C15, a polar capacitor C5, and a polar capacitor C7, wherein the negative terminals of the polar capacitor C5 and the polar capacitor C7 are both grounded to PGND. The function of the capacitor C5 and the capacitor C7 is to store energy after the bridge rectifier circuit BD1 is rectified.

[0031] When setting up the suppression circuit, an important note is that the suppression circuit is set close to the main winding T1A of the transformer for better suppression effect.

[0032] The suppression circuit includes a capacitor C6 and a resistor R7, wherein the first end of the capacitor C6 is connected to the first end of the primary coil of the main winding T1A, the second end of the capacitor C6 is connected to the first end of the resistor R7, and the second end of the resistor R7 is grounded to PGND. When the transformer is in the switching process, a certain oscillation will be generated, causing an electromagnetic interference waveform and affecting the product. The combination of the capacitor C6 and the resistor R7 in the suppression circuit of the utility model can better eliminate high-frequency oscillations.

[0033] A preferred technical solution of this embodiment: the capacitor C6 is a high-voltage ceramic capacitor capable of filtering high-frequency interference. The capacitor C6 is a capacitor with a specification of 1nf-50nf 1KV.

[0034] A preferred technical solution of this embodiment: the resistor R7 is a chip resistor with a resistance range of 5Ω-100Ω.

[0035] A preferred technical solution of this embodiment: the output end of the bridge rectifier circuit BD1 is connected to the first end of the primary coil of the main winding T1A and the first end of the resistor R15, and the resistor R15 is respectively connected in parallel with a resistor R16, a resistor R17, and a capacitor C8;

[0036] The second end of the resistor R15 is connected to the first end of the resistor R3, and the resistor R3 is connected in parallel with a resistor R33 and a resistor R18;

[0037] The second end of the resistor R3 is connected to the cathode end of the diode D6 , and the anode end of the diode D6 is connected to the second end of the primary coil of the main winding T1A.

[0038] A preferred technical solution of this embodiment: the input end of the bridge rectifier circuit BD1 is connected to the second inductance circuit LF2, the input end of the second inductance circuit LF2 is connected to the first inductance circuit LF1, and the first inductance circuit LF1 is connected to a power supply.

[0039] like Figure 2-3 As shown, a preferred technical solution of this embodiment: the two AC ends of the bridge rectifier circuit BD1 are connected to photoresistors, whose negative electrodes are grounded to PGND, and the other ends of the two photoresistors are connected one-to-one to the two output pins of the second inductor circuit LF2, and the two output pins of the second inductor circuit LF2 are connected one-to-one to the positive ends of the two diodes, and the negative electrodes of the two diodes are connected to the first end of the resistor R9, and the second end of the resistor R9 is connected to the first end of the resistor R10, and the second end of the resistor R10 is connected to the PWM circuit. Figure 3 As shown, a PWM chip U1 is provided in the PWM circuit, and the PWM circuit mainly controls the switching of the switch tube so that the transformer can perform energy conversion.

[0040] like Figure 1 As shown, resistors R5 and R6 are connected in series and then capacitor CX1 is connected in parallel. The two ends of capacitor CX1 are respectively connected to the two output pins of the first inductance circuit LF1 and the two input pins of the second inductance circuit LF2. The input end of the first inductance circuit LF1 is connected to the alternating current through a fuse. The first inductance circuit LF1, the second inductance circuit LF2, and capacitor CX1 are all EMC suppression devices.

[0041] like Figure 7 As shown, the circuit formed by the light-emitting end U2A of the photosensitive device and the surrounding electronic components is a feedback circuit, and the feedback circuit mainly controls the output voltage range.

[0042] like Figure 5-6 As shown, transistor Q4 and transistor Q5 are output rectifier tubes, and polarized capacitor C14, polarized capacitor C16, polarized capacitor C17, and polarized capacitor C19 are used for output energy storage.

[0043] In summary, the suppression circuit of this utility model optimizes the existing industrial power supply circuit. A 5-100 ohm resistor is connected in series with the high-voltage ceramic capacitor. The resistance value of the capacitor also needs to be adjusted according to the actual effect of the product. The data of 60-200M is mainly improved and optimized. Note: The suppression circuit of this utility model must be close to the main winding of the transformer, so that the suppression effect will be better.

[0044] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly used in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. In a suppression circuit of a super junction MOS tube, the suppression circuit is connected to the output end of a bridge rectifier circuit BD1, and is respectively connected in parallel with a capacitor C15, a polar capacitor C5, and a polar capacitor C7, and the negative terminals of the polar capacitor C5 and the polar capacitor C7 are grounded to PGND, characterized in that: The suppression circuit is arranged near the main winding T1A of the transformer, and includes a capacitor C6 and a resistor R7. The first end of the capacitor C6 is connected to the first end of the primary coil of the main winding T1A, the second end of the capacitor C6 is connected to the first end of the resistor R7, and the second end of the resistor R7 is grounded PGND.

2. The suppression circuit of a super junction MOS tube according to claim 1, characterized in that: The capacitor C6 is a high-voltage ceramic capacitor capable of filtering high-frequency interference.

3. The suppression circuit of a super junction MOS tube according to claim 1, characterized in that: The capacitor C6 is a capacitor with a specification of 1nf-50nf 1KV.

4. The suppression circuit of a super junction MOS tube according to claim 1, characterized in that: The resistor R7 is a chip resistor with a resistance range of 5Ω-100Ω.

5. The suppression circuit of a super junction MOS tube according to claim 1, characterized in that: The output end of the bridge rectifier circuit BD1 is connected to the first end of the primary coil of the main winding T1A and the first end of the resistor R15, and the resistor R15 is respectively connected in parallel with a resistor R16, a resistor R17, and a capacitor C8; The second end of the resistor R15 is connected to the first end of the resistor R3, and the resistor R3 is connected in parallel with a resistor R33 and a resistor R18; The second end of the resistor R3 is connected to the cathode end of the diode D6 , and the anode end of the diode D6 is connected to the second end of the primary coil of the main winding T1A.

6. The suppression circuit of a super junction MOS tube according to claim 1, characterized in that: The input end of the bridge rectifier circuit BD1 is connected to the second inductance circuit LF2 , the input end of the second inductance circuit LF2 is connected to the first inductance circuit LF1 , and the first inductance circuit LF1 is connected to a power supply.

7. The suppression circuit of a super junction MOS tube according to claim 6, characterized in that: Both AC ends of the bridge rectifier circuit BD1 are connected to photoresistors, whose negative electrodes are grounded PGND. The other ends of the two photoresistors are connected one-to-one to the two output pins of the second inductor circuit LF2. The two output pins of the second inductor circuit LF2 are connected one-to-one to the positive ends of the two diodes. The negative electrodes of the two diodes are connected to the first end of the resistor R9 after being connected to each other. The second end of the resistor R9 is connected to the first end of the resistor R10, and the second end of the resistor R10 is connected to the PWM circuit.

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