CN205280794U - Current detection circuit who swashs two current transformer in power just recommends - Google Patents
Current detection circuit who swashs two current transformer in power just recommends Download PDFInfo
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- CN205280794U CN205280794U CN201520998808.3U CN201520998808U CN205280794U CN 205280794 U CN205280794 U CN 205280794U CN 201520998808 U CN201520998808 U CN 201520998808U CN 205280794 U CN205280794 U CN 205280794U
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Abstract
The utility model discloses a current detection circuit who swashs two current transformer in power just recommends relates to a current sampling circuit. The utility model discloses a current transformer, first magnetism reset circuit, a rectifier circuit, current -voltage converting circuit, the 2nd current transformer, second magnetism reset circuit and the 2nd rectifier circuit, the winding and a current transformer of transformer produces electromagnetic induction in the main circuit, and a current transformer loops through first magnetism reset circuit and a rectifier circuit links to each other with current -voltage converting circuit, another winding and the 2nd current transformer of transformer produces electromagnetic induction in the main circuit, and the 2nd current transformer loops through second magnetism reset circuit and the 2nd rectifier circuit links to each other with current -voltage converting circuit, current -voltage converting circuit links to each other with control circuit. The utility model has the advantages of it is following, low power consumption, little volume, economical and practical, signal isolation, the anti jamming intensity of increase, improvement power reliability and circuit be easy the realization simply.
Description
Technical field
The utility model relates to a kind of current sampling circuit, the current detecting circuit being specifically related in push-pull ortho-exciting power supply two current transformer.
Background technology
The essential domains such as communication, Industry Control, military project, space flight it are widely used in due to power supply product, improve the reliability of power supply and the protection of electrical equipment is seemed most important, the protection circuit such as overvoltage, overcurrent is the integral part that power supply is indispensable, current foldback circuit is that the electric current to power supply detects, when exceeding supply current ability, need take measures restriction output rating or cut off output, play protection power source and the effect of electrical equipment safety. current detecting circuit being also divided into input side or outgoing side current detecting, described in the utility model is input side current detecting circuit simultaneously. generally input side current detecting circuit is had and adopt resistance detection and current transformer mode, as flyback power supply adopts resistance sampling mode, for resistance detection mode, advantage is that circuit is simple, direct, shortcoming is that sampled signal is not isolated, disturbed big, lossy, is not therefore suitable for and needs signal isolation sampling and apply to the occasion of high-power power supply. and the current transformer detection circuit being applied in full bridge or half bridge circuit structure, its signal is isolated, loss power is little, circuit is simple, immunity from interference is strong, economical and practical, wide model is in being applied in high-power power supply, but current transformer generally can only Measuring Alternating Current Signal, two windings (two winding alternately work) are had for transformer primary side in push-pull ortho-exciting formula power supply, owing to current transformer can only be sampled exchange signal, when sampling with a current transformer, in order to prevent, the magnetic core in current transformer is full to be closed, current transformer center needs through contrary two wires of current direction, reset with the magnetic core completed in current transformer, the general primary side current of transformer of push-pull ortho-exciting topological power is bigger, wire is thicker, if when sampling with a current transformer, current transformer size strengthens, add installation difficulty, therefore the miniaturization Design of power supply is improve design difficulty, some is designed to realize miniaturization, give up current sampling circuit, reduce the reliability of power supply.
Summary of the invention
A kind of volume of the utility model offer is little, loss is little, circuit is simple, signal is isolated, immunity from interference is strong, is applicable to the input side current detecting circuit of push-pull ortho-exciting formula power supply, to reach the object measuring electric current or protection power source.
The technical solution of the utility model is:
In push-pull ortho-exciting power supply, a current detecting circuit for two current transformer, comprises the first current transformer, the first magnetic reset circuit, the first rectifying circuit, current-to-voltage converting circuit, the 2nd current transformer, the 2nd magnetic reset circuit and the 2nd rectifying circuit;
In main power circuit, a winding of transformer and the first current transformer produce electromagnetic induction, and the first current transformer is connected with current-to-voltage converting circuit with the first rectifying circuit by the first magnetic reset circuit successively;
In main power circuit, another winding of transformer and the 2nd current transformer produce electromagnetic induction, and the 2nd current transformer is connected with current-to-voltage converting circuit with the 2nd rectifying circuit by the 2nd magnetic reset circuit successively;
Current-to-voltage converting circuit is connected with pilot circuit.
Described first current transformer comprises current transformer H1A, and the 2nd current transformer comprises current transformer H2A; First magnetic reset circuit comprises fast recovery diode D3, and the 2nd magnetic reset circuit comprises fast recovery diode D4; First rectifying circuit comprises fast recovery diode D1, and the 2nd rectifying circuit comprises fast recovery diode D2; Current-to-voltage converting circuit comprises sampling resistance R1;
In current transformer H1A and main power circuit, primary winding 3-4 produces electromagnetic induction, and current transformer H1A is in parallel with fast recovery diode D3, and fast recovery diode D3 negative electrode is connected with fast recovery diode D1 anode;
In current transformer H2A and main power circuit, primary winding 1-2 produces electromagnetic induction, and current transformer H2A is in parallel with fast recovery diode D4, and fast recovery diode D4 negative electrode is connected with fast recovery diode D2 anode;
Fast recovery diode D3 anode is connected with fast recovery diode D4 anode, and the one end with resistance R1 is connected, one end of described resistance R1 with reference to be connected; Fast recovery diode D1 negative electrode is connected with fast recovery diode D2 negative electrode, and the other end with resistance R1 is connected; The two ends of resistance R1 are connected with pilot circuit.
The beneficial effects of the utility model are:
The utility model is applied to the current detecting of push-pull ortho-exciting formula power supply, can be used for current sample or circuit overcurrent protection. The utility model adopts two small current mutual inductors, separately carries out the mode of current sample, reduces power volume, solves the design difficulty of a current transformer, play the effect of electric current measuring and protection power supply simultaneously, it is to increase the property made of power supply. Compared with prior art, the utility model has the following advantages, and low power consumption, small volume, the isolation of economical and practical, signal, increases anti-interference intensity, improves power supply reliability and circuit simply easily realizes.
Accompanying drawing explanation
Fig. 1 is current detecting circuit diagram.
Fig. 2 is current detecting schematic circuit diagram.
Wherein, 1-main power circuit, 11-primary transform circuit, 12-transformer, 2-first current transformer, 3-first magnetic reset circuit, 4-first rectifying circuit, 5-current-to-voltage converting circuit, 6-pilot circuit, 7-the 2nd power transformer, 8-the 2nd magnetic reset circuit, 9-the 2nd rectifying circuit.
Embodiment
Below in conjunction with drawings and Examples, the utility model is described further.
As shown in Figure 1, the utility model is the current detecting circuit of two current transformer in push-pull ortho-exciting power supply, comprises the first current transformer 2, first magnetic reset circuit 3, first rectifying circuit 4, current-to-voltage converting circuit 5, the 2nd current transformer 7, the 2nd magnetic reset circuit 8 and the 2nd rectifying circuit 9; One end of current detecting circuit described in the utility model is connected with main power circuit 1, and the other end is connected with pilot circuit 6.
Described main power circuit 1 comprises push-pull ortho-exciting primary transform circuit 11 and transformer 12, and the function of main power circuit 1 carries out power conversion and adjustment; Described pilot circuit 6 is the core of power supply, comprises some circuit, and the function of pilot circuit 6 is by sampled voltage and other power supply state, and control main power circuit makes power supply normal operation.
The first side of transformer 12 in main power circuit 1 comprises two windings, and two winding alternately work, two windings produce electromagnetic induction with the first current transformer 2 and the 2nd current transformer 7 respectively. When transformer 12 two windings alternately work, the utility model can send the electric current signal of two windings to pilot circuit 6 and carry out power adjustment.
A winding and first current transformer 2 of the transformer 12 in main power circuit 1 produce electromagnetic induction, and the first current transformer 2 is connected with current-to-voltage converting circuit 5 with the first rectifying circuit 4 by the first magnetic reset circuit 3 successively; Another winding and the 2nd current transformer 7 of the transformer 12 in main power circuit 1 produce electromagnetic induction, and the 2nd current transformer 7 is connected with current-to-voltage converting circuit 5 with the 2nd rectifying circuit 9 by the 2nd magnetic reset circuit 8 successively; Current-to-voltage converting circuit 5 is connected with pilot circuit 6.
As shown in Figure 2, in the utility model, each several part composition and function are as follows: the first current transformer 2 comprises current transformer H1A, and the 2nd current transformer 7 comprises current transformer H2A, and both for being transformed to small area analysis signal by big current; First magnetic reset circuit 3 comprises fast recovery diode D3, and the 2nd magnetic reset circuit 8 comprises fast recovery diode D4, both for enable magnetic core according to time continuous requirement carry out magnetic core reset; First rectifying circuit 4 comprises fast recovery diode D1, and the 2nd rectifying circuit 9 comprises fast recovery diode D2, and both are for being direct current by the current commutates in the first current transformer 2 and the 2nd current transformer 7, and prevent reverse direction current flow; Current-to-voltage converting circuit 5 comprises sampling resistance R1, for electric current signal is converted to voltage signal.
Principle of work of the present utility model is as follows:
Transformer 12 armature winding 3-4 in current transformer H1A and main power circuit 1 produces electromagnetic induction, when primary winding 3-4 has electric current by time, also generation current in current transformer H1A; With reason, the transformer 12 armature winding 1-2 generation electromagnetic induction in current transformer H2A and main power circuit 1, when primary winding 1-2 has electric current by time, also generation current in current transformer H2A.
Current transformer H1A is in parallel with fast recovery diode D3, and fast recovery diode D3 negative electrode is connected with fast recovery diode D1 anode; Current transformer H2A is in parallel with fast recovery diode D4, and fast recovery diode D4 negative electrode is connected with fast recovery diode D2 anode; Fast recovery diode D3 anode is connected with fast recovery diode D4 anode, and the one end with resistance R1 is connected, one end of described resistance R1 also with reference to be connected; Fast recovery diode D1 negative electrode is connected with fast recovery diode D2 negative electrode, and the other end with resistance R1 is connected; The two ends of resistance R1 are connected with pilot circuit 6.
The working order of each several part of the utility model within a work period is as follows:
When power switch pipe Q1 conducting in main power circuit 1, electric current is had to flow through between primary winding 3-4, current flow in current transformer H1A, fast recovery diode D3 only saves, fast recovery diode D1 forward conduction, electric current forms loop by resistance R1, and electric current signal is converted to voltage signal, voltage signal sends into pilot circuit 6, and pilot circuit 6 adjusts according to demand modeling primary transform circuit; In the process, in current transformer H2A, no current flows through simultaneously, and fast recovery diode D2 only saves, and fast recovery diode D4 conducting, current transformer H2A magnetic core resets automatically.
When power switch pipe Q2 conducting in main power circuit 1, electric current is had to flow through between primary winding 1-2, current flowing in current transformer H2A, fast recovery diode D4 only saves, fast recovery diode D2 forward conduction, electric current forms loop by resistance R1, converts voltage signal to, voltage signal sends into pilot circuit 6, and pilot circuit 6 adjusts according to demand modeling primary transform circuit; In the process, in current transformer H1A, no current flows through simultaneously, and fast recovery diode D1 only saves, and fast recovery diode D3 conducting, current transformer H1A magnetic core resets automatically.
Above embodiment of the present utility model is explained in detail, above-mentioned enforcement mode is only optimum embodiment of the present utility model, but the utility model is not limited to above-described embodiment, in the ken that those of ordinary skill in the art possess, it is also possible to make a variety of changes under the prerequisite not departing from the utility model objective.
Claims (2)
1. the current detecting circuit of two current transformer in push-pull ortho-exciting power supply, it is characterised in that: comprise the first current transformer (2), the first magnetic reset circuit (3), the first rectifying circuit (4), current-to-voltage converting circuit (5), the 2nd current transformer (7), the 2nd magnetic reset circuit (8) and the 2nd rectifying circuit (9);
In main power circuit (1), a winding of transformer (12) and the first current transformer (2) produce electromagnetic induction, and the first current transformer (2) is connected with current-to-voltage converting circuit (5) with the first rectifying circuit (4) by the first magnetic reset circuit (3) successively;
In main power circuit (1), another winding of transformer (12) and the 2nd current transformer (7) produce electromagnetic induction, and the 2nd current transformer (7) is connected with current-to-voltage converting circuit (5) with the 2nd rectifying circuit (9) by the 2nd magnetic reset circuit (8) successively;
Current-to-voltage converting circuit (5) is connected with pilot circuit (6).
2. the current detecting circuit of two current transformer in push-pull ortho-exciting power supply as claimed in claim 1, it is characterized in that: described first current transformer (2) comprises current transformer H1A, the 2nd current transformer (7) comprises current transformer H2A; First magnetic reset circuit (3) comprises fast recovery diode D3, and the 2nd magnetic reset circuit (8) comprises fast recovery diode D4; First rectifying circuit (4) comprises fast recovery diode D1, and the 2nd rectifying circuit (9) comprises fast recovery diode D2; Current-to-voltage converting circuit (5) comprises sampling resistance R1;
In current transformer H1A and main power circuit (1), transformer (12) armature winding 3-4 produces electromagnetic induction, and current transformer H1A is in parallel with fast recovery diode D3, and fast recovery diode D3 negative electrode is connected with fast recovery diode D1 anode;
In current transformer H2A and main power circuit (1), transformer (12) armature winding 1-2 produces electromagnetic induction, and current transformer H2A is in parallel with fast recovery diode D4, and fast recovery diode D4 negative electrode is connected with fast recovery diode D2 anode;
Fast recovery diode D3 anode is connected with fast recovery diode D4 anode, and the one end with resistance R1 is connected, one end of described resistance R1 also with reference to be connected; Fast recovery diode D1 negative electrode is connected with fast recovery diode D2 negative electrode, and the other end with resistance R1 is connected; The two ends of resistance R1 are connected with pilot circuit (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520998808.3U CN205280794U (en) | 2015-12-04 | 2015-12-04 | Current detection circuit who swashs two current transformer in power just recommends |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520998808.3U CN205280794U (en) | 2015-12-04 | 2015-12-04 | Current detection circuit who swashs two current transformer in power just recommends |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205280794U true CN205280794U (en) | 2016-06-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520998808.3U Expired - Fee Related CN205280794U (en) | 2015-12-04 | 2015-12-04 | Current detection circuit who swashs two current transformer in power just recommends |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205280794U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106771533A (en) * | 2017-03-15 | 2017-05-31 | 南京航空航天大学 | A kind of alternating current current detection circuit that can reflect direct current biasing state based on Magnetic isolation |
-
2015
- 2015-12-04 CN CN201520998808.3U patent/CN205280794U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106771533A (en) * | 2017-03-15 | 2017-05-31 | 南京航空航天大学 | A kind of alternating current current detection circuit that can reflect direct current biasing state based on Magnetic isolation |
| CN106771533B (en) * | 2017-03-15 | 2019-05-10 | 南京航空航天大学 | A kind of alternating current detection circuit that can reflect direct current biasing state based on Magnetic isolation |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160601 Termination date: 20211204 |