CN201113809Y

CN201113809Y - Differential current mutual-inductor type energy supply

Info

Publication number: CN201113809Y
Application number: CNU2007200877663U
Authority: CN
Inventors: 徐垦; 徐雁; 肖霞; 朱明钧; 叶妙元
Original assignee: Huazhong University of Science and Technology
Current assignee: Huazhong University of Science and Technology
Priority date: 2007-10-26
Filing date: 2007-10-26
Publication date: 2008-09-10
Anticipated expiration: 2017-10-26

Abstract

The utility model discloses a difference current mutual inductor type power supply. A body of the power supply has two sets of coils which are respectively wound on two ring-shaped iron cores and the two sets of coils are connected differentially. Two AC input terminals of a bridge rectifying circuit are respectively connected with two output terminals of the difference coils, a negative DC output terminal of the bridge rectifying circuit is earthed, a positive DC output terminal of the bridge rectifying circuit outputs a pulse DC voltage and is accessed with a positive input terminal of a filter circuit; a positive output terminal of the filter circuit is connected with a positive input terminal of a voltage stabilizing circuit; a positive output terminal of the voltage stabilizing circuit is connected with an anode of an electrolytic capacitor C3, the anode and a cathode of the electrolytic capacitor C3 respectively serve as a positive output terminal and a negative output terminal of the power supply. Compared with the prior current mutual inductor type power supply with one coil, the difference current and voltage generated by the difference coil are very small under one time of the same current excitation; therefore, the difference current mutual inductor type power supply can keep working when a primary current is great. The difference current mutual inductor type power supply is mainly used for supplying the power for a high voltage side of an electronic mutual inductor.

Description

Differential current mutual-inductor type power supply

Technical field

The utility model belongs to the electric supply technical field, is specifically related to a kind of differential current mutual-inductor type power supply, and this power supply can be powered for electronic type transformer high voltage side.

Background technology

In electric power system, be extensive use of current transformer unshakable in one's determination.Current transformer unshakable in one's determination has current transformation and two kinds of effects of power supply simultaneously.

Novel electronic formula instrument transformer (also claiming air core coil formula or Rogowski coil type instrument transformer) obtains fast development and rapid progress in recent years.Different with current transformer unshakable in one's determination, electronic mutual inductor does not have function of supplying power, also needs to equip in addition power supply on the contrary and is its work power supply.Therefore the powerup issue of electronic type transformer high voltage side is subjected to showing great attention to of power industry.At present the supply power mode of electronic type transformer high voltage side has two kinds: 1, laser type power supply power supply, 2, current transformer formula power supply unshakable in one's determination power supply.Laser type power supply power supply is according to laser transmission and photoelectricity transformation principle work, and its shortcoming is that long-time stability are not high, valency is expensive, power output is less than normal, troublesome maintenance etc.The characteristics work that current transformer formula power supply unshakable in one's determination power supply can outwards be exported electric energy according to current transformer unshakable in one's determination itself is difficult the shortcoming of laser type power supply power supply, so is subjected to people's welcome.But still there is big problem in current transformer formula power supply unshakable in one's determination, is in particular in that electric power output voltage is subject to the influence of primary current size, causes the output voltage shakiness.People have proposed to utilize the improvement project of controllable silicon or diode shunting for this reason.But this scheme regulated output voltage, but it exists again when primary current is very big, current transformer formula power circuit heating unshakable in one's determination is serious, makes circuit be difficult to problems such as long-term work, and therefore this scheme only is applicable to that primary current is no more than the occasion of 1kA.Consider that a rated current often surpasses 1kA in the actual high-voltage circuit, therefore this solution is of limited application.(see document [1] Liu Zhongzhan. the energy supply method research of self-excitation source, electronic current mutual inductor high-pressure side. High-Voltage Electrical Appliances, 2006,42 (1): 55-57; [2] Wang Haiming, Zheng shoe last or hat block of restricting. the research of electronic current transducer high-pressure side power source design. power electronic technology, 2004, (7): 72-74)

Summary of the invention

The purpose of this utility model is to provide a kind of differential current mutual-inductor type power supply, even the heating when rated current far surpasses 1kA of this power supply is still lower, and can be in actual track midium or long term, stable work.

The differential current mutual-inductor type power supply that the utility model provides, it is characterized in that: the size of first, second ring-shaped core, structure and material are identical, be wound with first, second coil on first, second ring-shaped core respectively, first, second coil constitutes secondary coil jointly, differential coil is formed in the two mutual reversal connection;

Two outputs of the differential coil that two ac input ends of bridge rectifier are formed with first, second coil respectively link to each other, the negative dc output end ground connection of bridge rectifier, positive direct-current output output ripple direct voltage, and the positive input terminal of access filter circuit;

The positive input terminal of the positive output termination voltage stabilizing circuit of filter circuit, the equal ground connection of the negative input end of filter circuit and negative output terminal; The positive output end of voltage stabilizing circuit links to each other with the positive pole of electrochemical capacitor C3, the equal ground connection of the negative input end of voltage stabilizing circuit and negative output terminal, and the minus earth of electrochemical capacitor C3, the positive and negative electrode of electrochemical capacitor C3 are respectively as the positive and negative output of power supply.

The high-pressure side that the utility model differential current mutual-inductor type power supply can be electronic mutual inductor provides reliably, the stable supply of electrical energy of voltage, even heating is still very low when a rated current far surpasses 1kA, far below the current transformer formula power supply that only adopts controllable silicon or diode, so differential current mutual-inductor type power supply can be in actual track midium or long term, stable work.

Description of drawings

Fig. 1 is the structural representation of the utility model differential current mutual-inductor type power supply.

Fig. 2 is the circuit block diagram of electronic type transformer high voltage side power supply for differential current mutual-inductor type power supply, and wherein with dashed lines encirclement part is a differential current mutual-inductor type power supply.

Fig. 3 is a kind of circuit specific implementation of the utility model differential current mutual-inductor type power supply figure.

Embodiment

Below in conjunction with accompanying drawing and example the utility model is described in further detail.

As shown in Figure 1, the structure of the utility model differential current mutual-inductor type power supply is: the size of first, second ring-

shaped core

1,2, structure, material are all identical.Be wound with first,

second coil

3,4 on the ring-

shaped core

1,2 respectively, first,

second coil

3 and 4 common formation secondary coils, differential coil is formed in the two mutual reversal connection.

The number of turn of first coil 3 is relevant with many factors such as primary current rated value, power outputs, should determine according to experimental result during actual design, be generally tens of circles to hundreds of circles, the number of turn of second coil 4 is relevant with many factors such as primary current maximum, power outputs, generally can be first coil 3 the number of turn 30% to 90%.High voltage bus passes ring-

shaped core

1,2, forms the number of turn and be 1 primary winding on two ring-shaped cores.

Bridge rectifier 5 is used for the differential voltage of the alternation of

first coil

3,4 outputs of second coil is transformed into dc pulse moving voltage.Two outputs of the differential coil that two ac input ends of bridge rectifier 5 are formed with first coil 3, second coil 4 respectively link to each other the negative dc output end ground connection of bridge rectifier 5, the positive input terminal of positive direct-current output access filter circuit 6.

The positive input terminal of the positive output termination voltage stabilizing circuit 7 of filter circuit 6, the equal ground connection of the negative input end of filter circuit 6 and negative output terminal.The positive output end of voltage stabilizing circuit 7 links to each other with the positive pole of electrochemical capacitor C3, the equal ground connection of the negative input end of voltage stabilizing circuit 7 and negative output terminal.The minus earth of electrochemical capacitor C3.The effect of voltage stabilizing circuit 7 is that the direct voltage that excursion is bigger becomes the very little direct voltage of excursion.The positive and negative electrode of electrochemical capacitor C3 is as the positive and negative output of power supply, exportable direct voltage Vo stable, that excursion is very little.

The course of work of the utility model power supply is as follows:

When flowing through primary current Ip on the high voltage bus, the differential coil that first coil 3, second coil 4 are formed is exported the differential current and the voltage of alternation jointly, differential voltage is transformed into the direct voltage that magnitude of voltage changes with primary current after bridge rectifier 5 rectifications, filter circuit 6 filtering, be transformed into galvanic current through voltage stabilizing circuit 7, C3 again and press Vo, Vo is the output of differential current mutual-inductor type power supply.

Compare with the traditional current transformer unshakable in one's determination that has only single secondary coil, under equal primary current Ip excitation, the differential current of the alternation that differential coil produced and voltage are much smaller than the alternating current and the voltage of single coil.For same bridge rectifier output voltage values, first coil 3, much bigger when the value of required Ip worked independently than single first coil 3 or single second coil 4 when second coil 4 was formed differential coils work.For example, first coil 3 is 100 circles, when second coil 4 is 55 circles, when the bridge rectifier output voltage is 26V, the first coil 3 pairing Ip that works independently is 0.4kA, and first coil 3, second coil 4 to form the pairing Ip of differential coil work be 1.6kA.Therefore, even Ip numerical value is very big, differential current mutual-inductor type power supply is operate as normal for a long time still, exports stable voltage and power.Here, the allowed band that Ip changes can reach thousands of amperes, and concrete numerical value is relevant with factors such as first coil 3, second coil, 4 coil turns.The input direct voltage excursion of the voltage stabilizing circuit 7 in the utility model is 9～30V, the output dc voltage rated value can be selected among 6V, 8V, 10V, 12V, 15V, 18V etc., can select one of them as power supply output dc voltage rated value according to specific requirement during actual design.

The annexation of differential current mutual-inductor type power supply of the present utility model and electronic type transformer high voltage side as shown in Figure 2.Electronic mutual inductor sensing device 8 changes the primary current Ip on the high voltage bus that collects into weak electric signal and is sent to electronic type transformer high voltage side signal condition, data processing circuit 9, electronic type transformer high voltage side signal condition, data processing circuit 9 change this weak electric signal into digital signal, and are sent to the low-pressure side part 10 of electronic mutual inductor by optical fiber.The output voltage terminal that is installed in the differential current mutual-inductor type power supply 11 of electronic type transformer high voltage side is connected with the power supply end of electronic type transformer high voltage side signal condition, data processing circuit 9, is electronic type transformer high voltage side signal condition, data processing circuit 9 power supplies.Even Ip numerical value is very big on the tested high voltage bus, differential current mutual-inductor type power supply also can guarantee the operate as normal of electronic type transformer high voltage side, because differential current mutual-inductor type power supply and electronic mutual inductor low-pressure side do not have getting in touch of electricity, also guaranteed the electric insulation between electronic mutual inductor high and low pressure side simultaneously.

Example:

If the Ip rated value of primary current is 1.5kA, requiring excursion when primary current is 0.15kA during to 1.8kA, and differential current mutual-inductor type power supply can be exported the electric current that stable 8V direct voltage and maximum are no more than 80mA.

Filter circuit 6 adopts and constitutes π shape filter circuit by electrochemical capacitor C1 and inductance L, electrochemical capacitor C2.The two ends of inductance L link to each other with the positive pole of electrochemical capacitor C1, C2 respectively.The negative pole of electrochemical capacitor C1, C2 links to each other, and ground connection.The positive pole of electrochemical capacitor C1 connects the positive direct-current output of bridge rectifier 5, and the positive pole of electrochemical capacitor C2 connects the positive input terminal of voltage stabilizing circuit 7.

Each component parameters of differential current mutual-inductor type power supply is as follows: the first coil 3=100 circle, the second coil 4=55 circle; The overall diameter of first 1 and second iron core 2 unshakable in one's determination is 190mm, and interior diameter is 170mm, and cross-sectional area is 200mm ²Bridge rectifier 5 electric current 10A, withstand voltage 400V; Capacitor C 1, C2 are the electrochemical capacitor of 1000 μ f/100V; Inductance L=3mH; It is the linear voltage-stabilizing circuit that 8V, maximum output current reach 1A that voltage stabilizing circuit 7 adopts output voltage, for example linear three terminal regulator 7808; Capacitor C 3=2200 μ f/25V.

Actual measurement shows, when primary current Ip when 0.15kA changes to 1.8kA, output end voltage Vo keeps about 8V constant, output maximum simultaneously is no more than the electric current of 80mA.Satisfy above-mentioned predefined requirement.

Claims

1, a kind of differential current mutual-inductor type power supply, it is characterized in that: size, structure and the material of first, second ring-shaped core (1,2) are identical, be wound with first, second coil (3,4) on first, second ring-shaped core (1,2) respectively, first, second coil (3,4) constitutes secondary coil jointly, differential coil is formed in the two mutual reversal connection;

Two outputs of the differential coil that two ac input ends of bridge rectifier (5) are formed with first, second coil (3,4) respectively link to each other, the negative dc output end ground connection of bridge rectifier (5), positive direct-current output output ripple direct voltage, and the positive input terminal of access filter circuit (6);

The positive input terminal of the positive output termination voltage stabilizing circuit (7) of filter circuit (6), the negative input end of filter circuit (6) and the equal ground connection of negative output terminal; The positive output end of voltage stabilizing circuit (7) links to each other with the positive pole of electrochemical capacitor C3, the negative input end of voltage stabilizing circuit (7) and the equal ground connection of negative output terminal, and the minus earth of electrochemical capacitor C3, the positive and negative electrode of electrochemical capacitor C3 are respectively as the positive and negative output of power supply.

2, differential current mutual-inductor type power supply according to claim 1 is characterized in that: the number of turn of second coil (4) be first coil (3) the number of turn 30% to 90%.

3, differential current mutual-inductor type power supply according to claim 1 and 2, it is characterized in that: the π shape filter circuit of filter circuit (6) for constituting by electrochemical capacitor C1, inductance L, electrochemical capacitor C2, the two ends of inductance L link to each other with the positive pole of electrochemical capacitor C1, C2 respectively, the negative pole of electrochemical capacitor C1, C2 links to each other, and ground connection, the positive pole of electrochemical capacitor C1 connects the positive direct-current output of bridge rectifier (5), and the positive pole of electrochemical capacitor C2 connects the positive input terminal of voltage stabilizing circuit (7).