CN104953577A - Anti-surge power supply protection device for electronic equipment - Google Patents

Abstract

The invention discloses an anti-surge power supply protection device for electronic equipment. There are anti-interference X-type capacitors CX1 and CX2 connected in parallel with the negative pole of the power supply, and a differential-mode high-frequency signal blocking coil M1 and a common-mode high-frequency signal between the anti-interference X-type capacitors CX1 and CX2 are connected between the positive pole of the power supply and the negative pole of the power supply. Signal blocking coil M2; a surge current suppression circuit is connected to the positive input terminal of the power supply, and a surge voltage suppression circuit is connected between the positive pole of the power supply and the negative pole of the power supply; C1, C2, CX1, CX2, M1, and M2 form a common mode/differential mode The high-frequency filter suppresses the external crosstalk signal from entering the main working circuit, and prevents the high-frequency interference signal from interfering with the main control and its periphery; the present invention can not only effectively prevent external surges, but also effectively prevent internal surges .

Description

Anti-surge power supply protection device for electronic equipment

technical field

The invention relates to an electronic equipment protection device, in particular to an anti-surge power supply protection device.

Background technique

Surge, as the name implies, is an instantaneous overvoltage exceeding the normal working voltage, known as transient pulse voltage, transient overvoltage, surge or surge, etc. A violent pulse usually lasting about one millionth of a second. There are two types of sources of electrical surges: external electrical surges and internal electrical electrical surges. The main source of external surges is lightning, and the source of internal surges is the overvoltage generated on power lines by switching operations in the grid. In the distribution network, a large number of applications of electronic equipment, the interaction between high and low voltage equipment. As a result, power surges occur very frequently, endangering the electronic equipment in the line all the time, and will definitely affect the normal operation and service life of the equipment over time. In the current engineering application, basically no measures have been taken for the surge of these devices, and it is considered that the substation has been grounded. There are many transmission paths of surge, which can be said to be pervasive, which brings great difficulty to the surge protection work. All surge protection must be implemented from many aspects. Simple grounding and equipotential cannot ensure the protection of electronic information systems. safety. In order to ensure the safe operation of electronic equipment and ensure the reliable operation of the device, higher requirements are put forward for the lightning protection and surge protection of electronic equipment.

Contents of the invention

The technical problem to be solved by the present invention is to provide an anti-surge power supply protection device for electronic equipment, which can not only effectively prevent external surges, but also effectively prevent internal surges.

In order to solve the above-mentioned technical problems, the technical solution of the present invention is: an anti-surge power supply protection device for electronic equipment, including anti-jamming Y-type Capacitors C1 and C2, anti-interference X-type capacitors CX1 and CX2 are connected in parallel between the positive pole of the power supply and the negative pole of the power supply, and the anti-jamming X-type capacitors CX1 and CX2 are connected between the positive pole of the power supply and the negative pole of the power supply. Differential-mode high-frequency signal blocking coil M1 and common-mode high-frequency signal blocking coil M2 between CX2; the positive input terminal of the power supply is connected with a surge current suppression circuit, and a surge current is connected between the positive pole of the power supply and the negative pole of the power supply. A surge voltage suppression circuit, the surge voltage suppression circuit is connected to the ground wire.

As a preferred technical solution, the surge current suppression circuit includes a positive temperature coefficient resettable fuse PTC.

As a preferred technical solution, the surge voltage suppression circuit includes a piezoresistor PTC1 connected between the positive pole of the power supply and the negative pole of the power supply, and also includes series-connected piezoresistors PTC2 and PTC3, the piezoresistor Resistors PTC2 and PTC3 are connected in parallel with the piezoresistor PTC1, a gas discharge tube RJ1 is connected between the piezoresistors PTC2 and PTC3, and the other end of the gas discharge tube RJ1 is connected to the ground wire.

Due to the adoption of the above technical solution, the anti-surge power supply protection device for electronic equipment includes anti-interference Y-type capacitors C1 and C2 respectively connected between the positive input terminal of the power supply and the ground wire, and between the negative input terminal of the power supply and the ground wire. Anti-interference X-type capacitors CX1 and CX2 are connected in parallel between the positive pole of the power supply and the negative pole of the power supply, and a differential mode between the positive pole of the power supply and the negative pole of the power supply is connected between the anti-interference X-type capacitors CX1 and CX2. The high-frequency signal blocking coil M1 and the common-mode high-frequency signal blocking coil M2; the positive input terminal of the power supply is connected with a surge current suppression circuit, and a surge voltage suppression circuit is connected between the positive pole of the power supply and the negative pole of the power supply, so The surge voltage suppression circuit described above is connected to the ground wire; C1, C2, CX1, CX2, M1, and M2 form a common-mode/differential-mode high-frequency filter, which suppresses external crosstalk signals from entering the main working circuit and prevents high-frequency interference signals Possible interference to the main control and its periphery; with the cooperation of the surge current suppression circuit and the surge voltage suppression circuit, the present invention can not only effectively prevent external surges, but also effectively prevent internal surges.

Description of drawings

The following drawings are only intended to illustrate and explain the present invention schematically, and do not limit the scope of the present invention.

Fig. 1 is a circuit diagram of an embodiment of the present invention.

Detailed ways

Below in conjunction with accompanying drawing and embodiment, further elaborate the present invention. In the following detailed description, certain exemplary embodiments of the invention are described by way of illustration only. Needless to say, those skilled in the art would realize that the described embodiments can be modified in various different ways, all without departing from the spirit and scope of the present invention. Accordingly, the drawings and description are illustrative in nature and not intended to limit the scope of the claims.

As shown in Figure 1, the anti-surge power supply protection device for electronic equipment includes anti-interference Y-type capacitors C1 and C2 respectively connected between the positive input terminal of the power supply and the ground wire, and between the negative input terminal of the power supply and the ground wire. Anti-interference X-type capacitors CX1 and CX2 are connected in parallel between the positive pole of the power supply and the negative pole of the power supply, and a differential mode high voltage between the positive pole of the power supply and the negative pole of the power supply is connected between the anti-interference X-type capacitors CX1 and CX2. High-frequency signal blocking coil M1 and common-mode high-frequency signal blocking coil M2; the positive input terminal of the power supply is connected with a surge current suppression circuit, and the surge current suppression circuit includes a self-recovery fuse PTC with a positive temperature coefficient; the positive electrode of the power supply A surge voltage suppression circuit is connected to the negative pole of the power supply, the surge voltage suppression circuit is connected to the ground wire, and the surge voltage suppression circuit includes a voltage regulator connected between the positive pole of the power supply and the negative pole of the power supply The varistor PTC1 also includes series varistors PTC2 and PTC3, the varistors PTC2 and PTC3 are connected in parallel with the varistor PTC1, and a gas discharge tube RJ1 is connected between the varistors PTC2 and PTC3, so The other end of the gas discharge tube RJ1 is connected to the ground wire.

Functionally, the present invention is divided into three parts, which are high-frequency interference signal suppressing circuit, surge current suppressing circuit and surge voltage suppressing circuit.

1. High-frequency interference signal suppression circuit

The input capacitors C1 and C2 are anti-interference Y-type capacitors, which can bypass high-frequency interference signals to the ground or reference ground. Capacitors CX1 and CX2 are interference X-type capacitors, which can absorb differential-mode high-frequency signals coming in through power line crosstalk. ; M1 is a differential-mode coil, which has a strong resistance to differential-mode high-frequency signals; M2 is a common-mode coil, which has a strong resistance to common-mode high-frequency signals. In this way, C1, C2, CX1, CX2, M1, and M2 form a common-mode/differential-mode high-frequency filter, which suppresses external crosstalk signals from entering the main working circuit, and prevents high-frequency interference signals from interfering with the main control and its peripherals.

2. Inrush current suppression circuit

F1 is a self-recovery fuse (PTC) with a positive temperature coefficient, and the parameter is 250V800mA. When a surge current passes through, the temperature of F1 rises rapidly in a very short time, and its internal resistance increases rapidly as the temperature rises until the current is completely blocked, protecting the subsequent circuits from overcurrent. In addition, after the surge current disappears, the PTC needs a few seconds to a few minutes (related to the temperature rise and the ambient temperature) to return to the low impedance state, and the subsequent circuit resumes work.

3. Surge voltage suppression circuit

PTC1, PTC2, and PTC3 are piezoresistors, and RJ1 is a gas discharge tube, which are connected in parallel between the input power line and the ground line. When there is a surge voltage input, the voltage exceeds the threshold value of the varistor, and the varistor becomes a low-resistance state within a few microseconds to hundreds of microseconds, absorbing 10KA of current energy instantly. Gas discharge tubes have the ability to absorb surge voltage similar to varistors, and their use together can improve the reliability and stability of the circuit.

The description of the present invention has been presented for purposes of illustration and description, but is not intended to be exhaustive or limited to the invention in the form disclosed. Many modifications and changes will be apparent to those of ordinary skill in the art. The embodiment was chosen and described in order to better explain the principles of the invention and the practical application, and to enable others of ordinary skill in the art to understand the invention and design various embodiments with various modifications as are suited to the particular use.

Claims (3)

1. The anti-surge power supply protection device for electronic equipment is characterized in that: it includes anti-interference Y-type capacitors C1 and C2 respectively connected between the positive input terminal of the power supply and the ground wire, and between the negative input terminal of the power supply and the ground wire. Anti-interference X-type capacitors CX1 and CX2 are connected in parallel between the positive pole of the power supply and the negative pole of the power supply, and a differential mode high voltage between the positive pole of the power supply and the negative pole of the power supply is connected between the anti-interference X-type capacitors CX1 and CX2. High-frequency signal blocking coil M1 and common-mode high-frequency signal blocking coil M2; the positive input end of the power supply is connected with a surge current suppression circuit, and a surge voltage suppression circuit is connected between the positive pole of the power supply and the negative pole of the power supply. The surge voltage suppression circuit is connected to the ground. 2. The anti-surge power supply protection device for electronic equipment according to claim 1, characterized in that: the surge current suppression circuit includes a positive temperature coefficient self-recovery fuse PTC. 3. The anti-surge power supply protection device for electronic equipment according to claim 1 or 2, characterized in that: the surge voltage suppression circuit includes a piezoresistor PTC1 connected between the positive pole of the power supply and the negative pole of the power supply , also includes series piezoresistors PTC2 and PTC3, said piezoresistors PTC2 and PTC3 are connected in parallel with said piezoresistor PTC1, a gas discharge tube RJ1 is connected between said piezoresistors PTC2 and PTC3, said gas discharge The other end of the tube RJ1 is connected to the ground wire.