CN218788723U

CN218788723U - Y capacitor application circuit of switching power supply

Info

Publication number: CN218788723U
Application number: CN202222410296.7U
Authority: CN
Inventors: 张雯淇; 李如宝
Original assignee: Xiamen Junhao Technology Co ltd
Current assignee: Xiamen Junhao Technology Co ltd
Priority date: 2022-09-13
Filing date: 2022-09-13
Publication date: 2023-04-04
Anticipated expiration: 2032-09-13

Abstract

The utility model discloses a switching power supply's Y electric capacity application circuit belongs to off power supply circuit technical field, has solved the promotion of how to be convenient for the interference killing feature and the test problem of being convenient for, and its technical scheme main points are including the switching power supply main part that has high-pressure side, hot ground end, cold ground end, it has at least one Y electric capacity to establish ties between hot ground end and the cold ground end, it has at least one Y electric capacity to still establish ties between high-pressure side and the cold ground end, has reached and has improved anti-electromagnetic interference ability, the effect of convenient to maintain and overhaul.

Description

Y capacitor application circuit of switching power supply

Technical Field

The utility model relates to a switching power supply circuit field especially relates to switching power supply's Y electric capacity application circuit.

Background

A Switch Mode Power Supply (SMPS), also called a switching Power Supply, and a switching converter, is a high-frequency Power conversion device, and is one of Power supplies. The function is to convert a level voltage into a voltage or current required by the user terminal through different types of architectures. The input of the switching power supply is mostly an ac power supply (e.g., commercial power) or a dc power supply, and the output is mostly a device requiring the dc power supply.

An example of the switching power supply shown in fig. 1 and 2 mainly includes an ac input terminal, an input protection element and EMC circuit, a single-capacitor or LC dual-capacitor circuit, an absorption circuit, a control circuit, a power supply circuit, a transformer TR1, an output rectifying filter circuit, and a feedback control circuit; the connection structure comprises an alternating current input end connected to an input protection element and an EMC circuit, the output side of the input protection element and the EMC circuit is connected with a single-capacitor or LC double-capacitor circuit, the output side of the single-capacitor or LC double-capacitor circuit is provided with a high-voltage end S1 and a thermal ground end S2, the high-voltage end S1 is connected with an absorption circuit, the thermal ground end S2 is connected with a control circuit, the control circuit is further connected with a power supply circuit, the absorption circuit is connected with an LP winding on the primary side of a transformer TR1, the power supply circuit is connected with an auxiliary FB winding for feedback of the transformer, an LS winding on the secondary side of the transformer TR1 is connected with an output rectification filter circuit, and a cold ground end is led out from the LS winding on the secondary side of the transformer TR 1.

As can be seen from the above structure, a general switching power supply circuit includes a high voltage terminal, a hot ground terminal and a cold ground terminal, and conventionally, 1 or 2Y capacitors are connected in series between the hot ground terminal and the cold ground terminal. The Y capacitor is a safety capacitor and is used in the situation that after the capacitor fails, electric shock cannot be caused, and personal safety is not endangered. The Y capacitors are capacitors connected across the power line lines and ground (L-E, N-E), respectively, and are typically present in pairs. Based on the limitation of leakage current, the Y capacitance value cannot be too large, the Y capacitance is nF level, and the Y capacitance inhibits common mode interference.

In different electromagnetic environments, different requirements for interference resistance need to be met, adaptability adjustment is needed, wiring positions and the number of Y capacitors are set during production of the switching power supply and are not easy to adjust, the defect of adjustment of the subsequent anti-interference capacity is caused, more peripheral anti-electromagnetic interference elements need to be used, cost is increased, and testing is not convenient. The application of the Y capacitor to the switching power supply is the key to solve the problem.

Therefore, the technical problems to be solved are as follows: how to facilitate the improvement of the anti-interference ability and the test.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem in the correlation technique to prior art's weak point at least to a certain extent, provide switching power supply's Y electric capacity application circuit, when having the interference killing feature that improves, the advantage of test and maintenance of can being convenient for.

In order to solve the technical problem, the technical scheme of the utility model is that: the Y capacitor application circuit of the switch power supply comprises a switch power supply main body with a high-voltage end, a hot ground end and a cold ground end, wherein at least one Y capacitor is connected in series between the hot ground end and the cold ground end, and at least one Y capacitor is also connected in series between the high-voltage end and the cold ground end.

Preferably, a jumper wire assembly is connected in series on the series circuit of the Y capacitor and comprises two plug pin seats and a jumper wire, two ends of the jumper wire are respectively connected with the two plug pin seats in an inserting mode for conducting connection, and the two plug pin seats are welded on the series circuit.

Preferably, the switching power supply main body further comprises a PE input terminal, and at least one Y capacitor is connected to the PE input terminal.

Preferably, still be provided with switch circuit on the series circuit of Y electric capacity, switch circuit includes hall sensor, comparison module and relay module, hall sensor is used for responding to external magnetic field output sensing signal, comparison module connects and is used for receiving sensing signal and judges whether surpass the threshold value in hall sensor, and comparison module judges that sensing signal surpasss the threshold value after output judgement signal, and relay module connects and is used for receiving judgement signal in comparison module's output, and relay module still connects and is used for controlling the break-make of series circuit on the series circuit of Y electric capacity.

Preferably, the relay module includes relay coil and a plurality of linked switch portions, switch portion connects respectively on the series connection line of Y electric capacity, switch portion is normally closed switch, and normally closed switch disconnection after the relay module receives the judgement signal.

Preferably, the comparison module includes a comparator and a threshold setting circuit, the in-phase end of the comparator is connected to the hall sensor, the out-phase end of the comparator is connected to the threshold setting circuit, the threshold setting circuit provides a preset voltage signal, and the judgment signal output by the comparator is a high level signal.

Compared with the prior art, the utility model discloses technical effect mainly embodies in following aspect:

1. the Y capacitor is added between the high-voltage end and the cold ground end in series, so that the anti-electromagnetic interference capability of the whole switching power supply can be improved with less cost, meanwhile, the performance of the switching power supply is improved, and other anti-interference elements are not needed or reduced, so that the cost is reduced, and the maintenance is convenient;

2. the Y capacitors are connected in a jumper manner, so that the input quantity and the input positions of the Y capacitors can be freely selected, or a spare capacitor is provided for maintenance and overhaul;

3. set up switch circuit on the series circuit, then can the auto-induction magnetic field judge, when magnetic field is greater than the settlement threshold value, thereby a plurality of Y electric capacity can establish ties and play anti-jamming effect in the switching power supply circuit, mainly embody the effect that drops into use for the automation here.

Drawings

FIG. 1 is a first portion of an exemplary circuit schematic of a prior art switching power supply;

FIG. 2 is a second portion of an exemplary circuit schematic of a prior art switching power supply;

fig. 3 is a schematic diagram of embodiment 1, mainly illustrating the connection of the Y capacitor and the jumper assembly;

FIG. 4 is a schematic diagram showing a Y capacitor connection method of the PE input terminal in embodiment 1;

fig. 5 is a circuit diagram of a switch circuit in embodiment 2.

Reference numerals: 11. a high-voltage end; 12. a hot ground; 13. a cold ground end; 14. a Y capacitor; 15. a series circuit; 2. a jumper assembly; 21. a needle inserting seat; 22. a jumper wire; 3. a PE input end; 4. a switching circuit; 41. a Hall sensor; 42. a comparison module; 421. a comparator; 422. a threshold setting circuit; 43. and a relay module.

Detailed Description

The following detailed description of the embodiments of the present invention is made with reference to the accompanying drawings, so that the technical solution of the present invention can be more easily understood and grasped.

Example 1:

an example of the switching power supply shown in fig. 1 and 2 mainly includes an ac input terminal, an input protection element and EMC circuit, a single-capacitor or LC dual-capacitor circuit, an absorption circuit, a control circuit, a power supply circuit, a transformer TR1, an output rectifying filter circuit, and a feedback control circuit; the connection structure comprises an alternating current input end connected to an input protection element and an EMC circuit, wherein the output sides of the input protection element and the EMC circuit are connected with a single-capacitor or LC double-capacitor circuit, the output side of the single-capacitor or LC double-capacitor circuit is provided with a high-voltage end 11, an S1 and a hot ground end 12, an S2, the high-voltage end 11 and the S1 are connected with an absorption circuit, the hot ground end 12 and the S2 are connected with a control circuit, the control circuit is further connected with a power supply circuit, the absorption circuit is connected with an LP winding on the primary side of a transformer TR1, the power supply circuit is connected with an auxiliary FB winding for feedback of the transformer, an LS winding on the secondary side of the transformer TR1 is connected with an output rectifying and filtering circuit, and a cold ground end 13 is led out of the LS winding on the secondary side of the transformer TR 1.

For this example, the key technology of the scheme is as follows: a Y capacitor 14 application circuit of a switching power supply comprises a switching power supply main body with a high-voltage end 11, a hot ground end 12 and a cold ground end 13. Referring to fig. 3, at least one Y capacitor 14 is connected in series between the hot ground 12 and the cold ground 13, and at least one Y capacitor 14 is also connected in series between the high voltage 11 and the cold ground 13.

The scheme is further optimized, in order to further facilitate maintenance, the jumper wire 22 assembly 2 is connected in series on the series line 15 of the Y capacitor 14, the jumper wire 22 assembly 2 comprises two plug pin seats 21 and a jumper wire 22, two ends of the jumper wire 22 are respectively connected with the two plug pin seats 21 in an inserted mode for conducting connection, and the two plug pin seats 21 are welded on the series line 15.

Therefore, the series Y capacitor 14 is added between the high-voltage end 11 and the cold ground end 13, so that the anti-electromagnetic interference capability of the whole switching power supply can be improved with less cost, meanwhile, the performance of the switching power supply is improved, and the use of other anti-interference elements is not needed or reduced, thereby reducing the cost and facilitating the maintenance. In particular, by means of jumpers 22, so as to allow for a free choice of the number and position of the Y capacitors 14 to be put in, or to provide redundancy for maintenance and repair.

Then, based on the above scheme, the switching power supply main body further includes a PE input terminal 3, and at least one Y capacitor 14 is connected to the PE input terminal 3.

Example 2:

based on embodiment 1, it is known that a series circuit 15 with a plurality of Y capacitors 14 at different positions can further solve the automatic switching control problem based on the above scheme.

As shown in fig. 5, the switching circuit 4 is further provided on the series line 15 of the Y capacitor 14. The switching circuit 4 includes a hall sensor 41, a comparison module 42, and a relay module 43. The hall sensor 41 is used for sensing an external magnetic field to output a sensing signal, the comparison module 42 is connected to the hall sensor 41 and used for receiving the sensing signal and judging whether the sensing signal exceeds a threshold value, the comparison module 42 outputs a judgment signal after judging that the sensing signal exceeds the threshold value, the relay module 43 is connected to the output end of the comparison module 42 and used for receiving the judgment signal, and the relay module 43 is further connected to the series circuit 15 of the Y capacitor 14 and used for controlling the on-off of the series circuit 15.

The comparison module 42 includes a comparator 421 and a threshold setting circuit 422. The in-phase terminal of the comparator 421 is connected to the hall sensor 41, the inverting terminal of the comparator 421 is connected to the threshold setting circuit 422, the threshold setting circuit 422 provides a preset voltage signal, and the determination signal output by the comparator 421 is a high level signal. The threshold setting circuit 422 is shown in fig. 5 and includes a voltage source Vcc, a resistor R3, and a potentiometer Rp1, wherein the voltage source Vcc is connected to one end of the resistor R3, the other end of the resistor R3 is connected to the potentiometer Rp1, the other end of the potentiometer Rp1 is grounded, and the potential adjustment end of the resistor Rp1 is used for providing a threshold voltage signal Vref1.

As can be seen from fig. 5, the relay module 43 includes a relay coil and a plurality of linked switch sections, each of which is connected to the series line 15 of the Y capacitor 14, and is a normally closed switch that is turned off when the relay module 43 receives the determination signal. The relay module 43 specifically includes a resistor R1, a resistor R2, a triode Q1, a diode D1, a voltage source 12V, a relay coil K1, and normally open switches K1-1 and K1-2. The connection mode is that one end of the resistor R1 is used for receiving the judgment signal, the other end of the resistor R1 is connected with the resistor R2 and the base electrode of the triode Q1, the emitting electrode of the triode Q1 is grounded, the collecting electrode of the triode Q1 is connected with the anode of the diode D1 and the coil K1, and the cathode of the diode D1 and the other end of the coil K1 are connected with the voltage source 12V.

When the hall sensor 41 senses a magnetic field, whether the magnetic field exceeds a threshold value can be judged through the comparator 421, if the magnetic field exceeds the threshold value, the relay coil K1 can be conducted through the triode Q1, and meanwhile, the normally open switches K1-1 and K1-2 are closed at the same time, so that the Y capacitor 14 is connected into a circuit of the switching power supply, and the anti-electromagnetic interference capability is improved.

Of course, the above is only a typical example of the present invention, and besides, the present invention can also have other various specific embodiments, and all technical solutions adopting equivalent replacement or equivalent transformation are all within the scope of the present invention as claimed.

Claims

1. The Y capacitor application circuit of the switching power supply comprises a switching power supply main body with a high-voltage end (11), a hot ground end (12) and a cold ground end (13), wherein at least one Y capacitor (14) is connected in series between the hot ground end (12) and the cold ground end (13), and the Y capacitor application circuit is characterized in that: and at least one Y capacitor (14) is also connected in series between the high-voltage end (11) and the cold ground end (13).

2. The Y capacitor application circuit of the switching power supply as claimed in claim 1, wherein: establish ties on series connection line (15) of Y electric capacity (14) and have jumper wire (22) subassembly (2), jumper wire (22) subassembly (2) include two plug pin seats (21) and jumper wire (22), and the both ends of jumper wire (22) are pegged graft with two plug pin seats (21) respectively and are used for the conductive connection, and two plug pin seats (21) weld on series connection line (15).

3. The Y capacitor application circuit of the switching power supply as claimed in claim 1, wherein: the switching power supply main body further comprises a PE input end (3), and at least one Y capacitor (14) is connected to the PE input end (3).

4. The Y capacitor application circuit of the switching power supply as claimed in claim 1, wherein: still be provided with switch circuit (4) on series connection line (15) of Y electric capacity (14), switch circuit (4) include hall sensor (41), comparison module (42) and relay module (43), hall sensor (41) are used for responding to external magnetic field output sensing signal, comparison module (42) are connected and are used for receiving sensing signal and judge whether surpass the threshold value in hall sensor (41), and comparison module (42) are judged sensing signal and are surpassed output judgement signal behind the threshold value, and relay module (43) are connected and are used for receiving judgement signal in the output of comparison module (42), and relay module (43) still are connected and are used for controlling the break-make of series connection line (15) on series connection line (15) of Y electric capacity (14).

5. The Y capacitor application circuit of the switching power supply as claimed in claim 4, wherein: the relay module (43) comprises a relay coil and a plurality of linked switch parts, the switch parts are respectively connected to the series circuit (15) of the Y capacitor (14), the switch parts are normally open switches, and the normally open switches are closed after the relay module (43) receives the judgment signals.

6. The Y capacitor application circuit of the switching power supply as claimed in claim 5, wherein: the comparison module (42) comprises a comparator (421) and a threshold setting circuit (422), wherein the in-phase end of the comparator (421) is connected with the Hall sensor (41), the anti-phase end of the comparator (421) is connected with the threshold setting circuit (422), the threshold setting circuit (422) provides a preset voltage signal, and a judgment signal output by the comparator (421) is a high-level signal.