Power supply EMI suppression circuit used for being matched with negative ion high-voltage discharge product

Abstract

The embodiment of the utility model discloses a power supply EMI suppression circuit used for being matched with a negative ion high-voltage discharge product, and belongs to the technical field of electronic circuits. Comprising an input end L, an input end N, a capacitor CX1, a resistor R1, a resistor R2, a rectifier bridge BD1, a pi-type filter circuit, an RCD absorption circuit, a VCC rectification power supply circuit, a resistor R3, a resistor R4, a resistor R10, a resistor R11, a resistor R12, a capacitor EC3, a resistor R7, a resistor R8, a resistor R9, a chip U1, a capacitor C1, a transformer T1, a resistor R15, a resistor R16, a capacitor C3, a diode D3, a capacitor EC4, a capacitor EC5, a capacitor CY1 and a capacitor CY2. And meanwhile, negative ion interference is transmitted to the ground, so that the effect of reducing the conduction interference of the whole machine is achieved, the power adapter is prevented from being interfered by negative ions, and the stability of the power adapter is improved.

Description

Technical Field

[0001] The present application belongs to the field of electronic circuit technology, and specifically relates to a power supply EMI suppression circuit for use with negative ion high voltage discharge products. Background Art

[0002] The power adapter is a plug that is connected to the corresponding device through a wire. When the traditional switching power supply is working, due to the high-frequency working mode of the primary and secondary, the energy is coupled to the secondary through the transformer core, which makes the traditional flyback switching power supply very strong in the power grid when used with negative ion high-voltage discharge ball products. The conduction test will exceed the standard abnormally. For some products with negative ion high-voltage amplification, the conventional power adapter will be interfered by the negative ions, thereby affecting the stability of the power adapter. Utility Model Content

[0003] In order to solve the above problems and technical defects, the embodiment of the present application adopts the following technical solution, a power supply EMI suppression circuit for matching negative ion high-voltage discharge products, including: an input terminal L, an input terminal N, a capacitor CX1, a resistor R1, a resistor R2, a rectifier bridge BD1, a π-type filter circuit, an RCD absorption circuit, a VCC rectifier power supply line, a resistor R3, a resistor R4, a resistor R10, a resistor R11, a resistor R12, a capacitor EC3, a resistor R7, a resistor R8, a resistor R9, a chip U1, a capacitor C1, a transformer T1, a resistor R15, a resistor R16, a capacitor C3, a diode D3, a capacitor EC4, a capacitor EC5, a capacitor CY1 and a capacitor CY2;

[0004] The input terminal L and the input terminal N are connected to two ends of the capacitor CX1 respectively;

[0005] The resistor R1 is connected in series with the resistor R2, and the resistor R1, the resistor R2 and the capacitor CX1 are connected in parallel;

[0006] The two input ends of the rectifier bridge BD1 are connected to the two ends of the capacitor CX1;

[0007] The input end of the π-type filter circuit is connected to the two output ends of the rectifier bridge BD1;

[0008] The input end of the RCD absorption circuit is connected to the output end of the π-type filter circuit, and the output end of the RCD absorption circuit is connected to the transformer T1;

[0009] The input end of the VCC rectifier power supply circuit is connected to the output end of the RCD absorption circuit, and the output end of the VCC rectifier power supply circuit is connected to pin 1 of the chip U1;

[0010] The resistor R3 is connected in series with the resistor R4, the resistor R3 is connected to the input terminal L, and the resistor R4 is connected to pin 1 of the chip U1;

[0011] One end of the resistor R10 is connected to the output end of the RCD absorption circuit, and the other end of the resistor R10 is connected to pins 2 and 3 of the chip U1;

[0012] One end of the resistor R11 is connected to pins 2 and 3 of the chip U1, the other end of the resistor R11 is connected in series with the resistor R12, and the resistor R12 is connected in parallel with the capacitor EC3;

[0013] The resistors R7, R8 and R9 are connected in parallel, the output ends of the resistors R7, R8 and R9 are connected to pin 4 of the chip U1, and the input ends of the resistors R7, R8 and R9 are connected to the resistor R12;

[0014] One end of the capacitor C1 is connected to pin 8 of the chip U1, and one end of the capacitor C1 is connected to pins 5 and 6 of the chip U1;

[0015] The resistor R15 is connected in series with the capacitor C3, the cathode of the diode D3 is connected to the capacitor C3 and the resistor R16, and the anode of the diode D3 and the resistor R15 are both connected to the transformer T1;

[0016] The resistor R16, the capacitor EC4 and the capacitor EC5 are connected in parallel with each other;

[0017] The capacitor CY1 and the capacitor CY2 are both connected to the ground PG.

[0018] Preferably, the resistor R3 and the resistor R4 are starting resistors;

[0019] The resistor R10 and the resistor R11 are voltage regulating resistors;

[0020] The chip U1 is a PWM control chip with a built-in power MOS tube;

[0021] The diode D3 is a secondary rectifier diode;

[0022] The capacitor EC4 and the capacitor EC5 are secondary filter capacitors;

[0023] The capacitor CY1 and the capacitor CY2 are Y capacitors.

[0024] Furthermore, the π-type filter circuit comprises: a capacitor EC1, an inductor LF1 and a capacitor EC2;

[0025] The capacitor EC1 is electrically connected to the inductor LF1 , and the inductor LF1 is electrically connected to the capacitor EC2 .

[0026] Further, the RCD absorption circuit includes: a diode D1, a resistor R6, a resistor R14 and a capacitor C2;

[0027] The resistor R6 is connected in series with the resistor R14 , the resistor R14 is connected in parallel with the capacitor C2 , and the resistor R6 is connected to the cathode of the diode D1 .

[0028] Further, the VCC rectifier power supply circuit includes: a resistor R13 and a diode D2;

[0029] The resistor R13 is connected to the anode of the diode D2.

[0030] Compared with the prior art, the beneficial effects of the embodiments of the present application are:

[0031] The present application uses the primary circuit and the secondary circuit to reduce grid interference through capacitor CX1 when performing primary and secondary high-frequency operation, and rectifies into a DC voltage through the rectifier bridge BD1, and then filters out the conducted interference through the π-type filter circuit, so that the conduction test will not exceed the standard abnormally. At the same time, by connecting a Y capacitor to the ground, the negative ion interference is transmitted to the ground, thereby achieving the effect of reducing the amount of conducted interference of the entire machine, so that the power adapter will not be interfered by negative ions, and the stability of the power adapter is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In the attached picture:

[0033] Figure 1 This is a circuit diagram of an embodiment of the present application. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Generally, the components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0035] Example

[0036] like Figure 1As shown, a power supply EMI suppression circuit for use with negative ion high-voltage discharge products includes: an input terminal L, an input terminal N, a capacitor CX1, a resistor R1, a resistor R2, a rectifier bridge BD1, a π-type filter circuit, an RCD absorption circuit, a VCC rectifier power supply line, a resistor R3, a resistor R4, a resistor R10, a resistor R11, a resistor R12, a capacitor EC3, a resistor R7, a resistor R8, a resistor R9, a chip U1, a capacitor C1, a transformer T1, a resistor R15, a resistor R16, a capacitor C3, a diode D3, a capacitor EC4, a capacitor EC5, a capacitor CY1, and a capacitor CY2;

[0037] The input terminal L and the input terminal N are connected to the two ends of the capacitor CX1 respectively; the resistor R1 and the resistor R2 are connected in series, and the resistor R1 and the resistor R2 are connected in parallel with the capacitor CX1; and the two input ends of the rectifier bridge BD1 are connected to the two ends of the capacitor CX1.

[0038] The input end of the π-type filter circuit is connected to the two output ends of the rectifier bridge BD1; the π-type filter circuit includes: capacitor EC1, inductor LF1 and capacitor EC2; capacitor EC1 is electrically connected to inductor LF1, and inductor LF1 is electrically connected to capacitor EC2.

[0039] The input end of the RCD absorption circuit is connected to the output end of the π-type filter circuit, and the output end of the RCD absorption circuit is connected to the transformer T1; the RCD absorption circuit includes: a diode D1, a resistor R6, a resistor R14 and a capacitor C2; the resistor R6 is connected in series with the resistor R14, the resistor R14 is connected in parallel with the capacitor C2, and the resistor R6 is connected to the cathode of the diode D1.

[0040] The input end of the VCC rectifier power supply circuit is connected to the output end of the RCD absorption circuit, and the output end of the VCC rectifier power supply circuit is connected to pin 1 of the chip U1; the VCC rectifier power supply circuit includes: a resistor R13 and a diode D2; the resistor R13 is connected to the positive electrode of the diode D2.

[0041] The resistor R3 is connected in series with the resistor R4, the resistor R3 is connected to the input terminal L, and the resistor R4 is connected to the pin 1 of the chip U1;

[0042] One end of the resistor R10 is connected to the output end of the RCD absorption circuit, and the other end of the resistor R10 is connected to pins 2 and 3 of the chip U1;

[0043] One end of the resistor R11 is connected to the pin 2 and the pin 3 of the chip U1, the other end of the resistor R11 is connected in series with the resistor R12, and the resistor R12 is connected in parallel with the capacitor EC3;

[0044] The resistors R7, R8 and R9 are connected in parallel, the output ends of the resistors R7, R8 and R9 are connected to the pin 4 of the chip U1, and the input ends of the resistors R7, R8 and R9 are connected to the resistor R12;

[0045] One end of the capacitor C1 is connected to pin 8 of the chip U1, and one end of the capacitor C1 is connected to pins 5 and 6 of the chip U1;

[0046] The resistor R15 is connected in series with the capacitor C3, the cathode of the diode D3 is connected with the capacitor C3 and the resistor R16, the anode of the diode D3 and the resistor R15 are both connected with the transformer T1; the resistor R16, the capacitor EC4 and the capacitor EC5 are connected in parallel.

[0047] The capacitor CY1 and the capacitor CY2 are both connected to the ground PG.

[0048] Resistor R3 and resistor R4 are starting resistors; resistor R10 and resistor R11 are voltage regulating resistors; chip U1 is a PWM control chip with a built-in power MOS tube; diode D3 is a secondary rectifier diode; capacitor EC4 and capacitor EC5 are secondary filter capacitors; capacitor CY1 and capacitor CY2 are Y capacitors.

[0049] AC power is input from the input terminals L and N, and the power grid interference is filtered through the capacitor CX1. The resistors R3 and R4 provide the current required for the chip U1 to start up by reducing the voltage through resistance at the moment of startup. The rectifier bridge BD1 rectifies the AC power into a DC voltage. The π-type filter circuit filters out the conducted interference. The VCC rectifier power supply line is provided with energy by the auxiliary winding of the transformer T1, and is rectified by the diode D2 to supply power to the pin 1 of the chip U1. The resistors R10 and R11 adjust the output voltage, and the resistors R7, R8 and R9 limit the output current.

[0050] Diode D3 converts the energy coupled from the primary of transformer T1 into DC voltage, and capacitors EC4 and EC5 store charge and filter out interference;

[0051] Capacitor CY1 and capacitor CY2 are matched with each other. Through this matching method, negative ion interference is introduced into the earth. According to the EN55032 test standard, the test margin is more than 6DB;

[0052] Resistors R1 and R2 are used to discharge capacitor CX1 when the power is turned off, and the RCD absorption circuit absorbs the instantaneous peak voltage generated by the MOS tube when it is turned off.

[0053] The above embodiments only express the preferred implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for ordinary technicians in this field, several modifications, improvements and substitutions can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application.

Claims

1. A power supply EMI suppression circuit for use with negative ion high voltage discharge products, characterized in that: include: Input terminal L, input terminal N, capacitor CX1, resistor R1, resistor R2, rectifier bridge BD1, π-type filter circuit, RCD absorption circuit, VCC rectifier power supply line, resistor R3, resistor R4, resistor R10, resistor R11, resistor R12, capacitor EC3, resistor R7, resistor R8, resistor R9, chip U1, capacitor C1, transformer T1, resistor R15, resistor R16, capacitor C3, diode D3, capacitor EC4, capacitor EC5, capacitor CY1 and capacitor CY2; The input terminal L and the input terminal N are connected to two ends of the capacitor CX1 respectively; The resistor R1 is connected in series with the resistor R2, and the resistor R1, the resistor R2 and the capacitor CX1 are connected in parallel; The two input ends of the rectifier bridge BD1 are connected to the two ends of the capacitor CX1; The input end of the π-type filter circuit is connected to the two output ends of the rectifier bridge BD1; The input end of the RCD absorption circuit is connected to the output end of the π-type filter circuit, and the output end of the RCD absorption circuit is connected to the transformer T1; The input end of the VCC rectifier power supply circuit is connected to the output end of the RCD absorption circuit, and the output end of the VCC rectifier power supply circuit is connected to pin 1 of the chip U1; The resistor R3 is connected in series with the resistor R4, the resistor R3 is connected to the input terminal L, and the resistor R4 is connected to pin 1 of the chip U1; One end of the resistor R10 is connected to the output end of the RCD absorption circuit, and the other end of the resistor R10 is connected to pins 2 and 3 of the chip U1; One end of the resistor R11 is connected to pins 2 and 3 of the chip U1, the other end of the resistor R11 is connected in series with the resistor R12, and the resistor R12 is connected in parallel with the capacitor EC3; The resistors R7, R8 and R9 are connected in parallel, the output ends of the resistors R7, R8 and R9 are connected to pin 4 of the chip U1, and the input ends of the resistors R7, R8 and R9 are connected to the resistor R12; One end of the capacitor C1 is connected to pin 8 of the chip U1, and one end of the capacitor C1 is connected to pins 5 and 6 of the chip U1; The resistor R15 is connected in series with the capacitor C3, the cathode of the diode D3 is connected to the capacitor C3 and the resistor R16, and the anode of the diode D3 and the resistor R15 are both connected to the transformer T1; The resistor R16, the capacitor EC4 and the capacitor EC5 are connected in parallel with each other; The capacitor CY1 and the capacitor CY2 are both connected to the ground PG.

2. According to claim 1, a power supply EMI suppression circuit for use with negative ion high voltage discharge products is characterized in that: The resistor R3 and the resistor R4 are starting resistors; The resistor R10 and the resistor R11 are voltage regulating resistors; The chip U1 is a PWM control chip with a built-in power MOS tube; The diode D3 is a secondary rectifier diode; The capacitor EC4 and the capacitor EC5 are secondary filter capacitors; The capacitor CY1 and the capacitor CY2 are Y capacitors.

3. The power supply EMI suppression circuit for use with negative ion high voltage discharge products according to claim 2, characterized in that: The π-type filter circuit comprises: a capacitor EC1, an inductor LF1 and a capacitor EC2; The capacitor EC1 is electrically connected to the inductor LF1 , and the inductor LF1 is electrically connected to the capacitor EC2 .

4. The power supply EMI suppression circuit for use with negative ion high voltage discharge products according to claim 2, characterized in that: The RCD absorption circuit includes: a diode D1, a resistor R6, a resistor R14 and a capacitor C2; The resistor R6 is connected in series with the resistor R14 , the resistor R14 is connected in parallel with the capacitor C2 , and the resistor R6 is connected to the cathode of the diode D1 .

5. The power supply EMI suppression circuit for use with negative ion high voltage discharge products according to claim 2, characterized in that: The VCC rectifier power supply circuit includes: a resistor R13 and a diode D2; The resistor R13 is connected to the anode of the diode D2.

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