CN214850612U - Dual-power switching circuit with direct-current EMI power filter - Google Patents
Dual-power switching circuit with direct-current EMI power filter Download PDFInfo
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- CN214850612U CN214850612U CN202120221327.7U CN202120221327U CN214850612U CN 214850612 U CN214850612 U CN 214850612U CN 202120221327 U CN202120221327 U CN 202120221327U CN 214850612 U CN214850612 U CN 214850612U
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Abstract
The utility model relates to a dual power supply switching technology field specifically discloses a dual power supply switching circuit with direct current EMI power filter, including first power, the second power, two diodes's common negative pole binding post, the public ground binding post of dual power, TVS pipe, filter capacitance, common mode choke, bleeder resistance, first Y electric capacity, first differential mode inductance, electrolytic capacitor, the anodal binding post of energy storage electrolytic capacitor, product aluminium system shell, first X electric capacity, second Y electric capacity, the analog ground, second differential mode inductance, energy storage electrolytic capacitor negative pole binding post and third X electric capacity. The utility model provides a dual power supply switching circuit with direct current EMI power filter solves dual power supply switching circuit's complexity and time difference problem, simplifies dual power supply switching circuit, and the noise interference of introducing when subsidiary power filter can eliminate normal power supply and switching power supply.
Description
Technical Field
The utility model relates to a dual power supply switching technology field, more specifically relates to a dual power supply switching circuit with direct current EMI power filter.
Background
At present, dual power supplies are needed to be used in many environments, and particularly, safe and stable dual power supply switching is needed under the condition of severe electromagnetic environment; such as building, elevator, medical aid, marine main push and the like, all need dual power backup and stable switching.
As shown in fig. 1, the main stream switching device in the prior art is composed of a PLC or MCU controller, an auxiliary switching device, an electrically-controlled/manually-controlled dc breaker (relay), a detection unit, etc. (the manual control method is basically not used any more), and has the following problems:
the PLC or the MCU still needs independent power supply when working, the detection unit outputs a control signal after detecting two paths of power supply voltages and switches the control signal to the other path of auxiliary power supply through an electric or manual direct current circuit breaker (relay), the action time and dead time of the circuit breaker need to be considered in the switching process, the switching time is long, electric sparks or power supply noise interference and other conditions are introduced in the switching process, delay time such as delay of propulsion or engine restarting is caused under complex sea conditions or emergency conditions, and dangers or losses are caused.
Disclosure of Invention
In order to solve exist not enough among the prior art, the utility model provides a dual power supply switching circuit with direct current EMI power filter solves dual power supply switching circuit's complexity and time difference problem, simplifies dual power supply switching circuit, and the noise interference of introducing when subsidiary power filter can eliminate normal power supply and switching power supply.
As a first aspect of the present invention, a dual power switching circuit with a dc EMI power filter is provided, including a first power supply, a second power supply, a dual diode, a common cathode terminal of the dual diode, a common ground terminal of the dual power supply, a TVS tube, a filter capacitor, a common mode choke coil, a bleeder resistor, a first Y capacitor, a first differential mode inductor, an electrolytic capacitor, an energy storage electrolytic capacitor anode terminal, a product aluminum shell, a first X capacitor, a second Y capacitor, a simulation ground, a second differential mode inductor, an energy storage electrolytic capacitor cathode terminal, and a third X capacitor, wherein the anode of the first power supply and the anode of the second power supply are respectively connected to the anode of the dual diode, and the cathode of the dual diode is connected to one end of the common cathode terminal of the dual diode; the negative electrode of the first power supply and the negative electrode of the second power supply are simultaneously connected to one end of a common ground wiring terminal of the dual power supplies; the TVS tube is used as an overvoltage protection device and is connected in parallel between a common cathode connecting terminal of the double diode and a common ground connecting terminal of a double power supply, the filter capacitor and the first X capacitor are connected in parallel with the TVS tube, the other end of the common cathode connecting terminal of the double diode is connected with a first common mode end of the common mode choke coil, the other end of the common ground connecting terminal of the double power supply is connected with a fourth common mode end of the common mode choke coil, one end of the second X capacitor and the bleeder resistor after being connected in parallel is connected with a second common mode end of the common mode choke coil, the other end of the second X capacitor and the bleeder resistor are respectively connected with a third common mode end of the common mode choke coil and an analog ground, and the third common mode end of the common mode choke coil is connected with the analog ground; a second common-mode end of the common-mode choke coil is respectively connected with one end of the first Y capacitor and one end of the first differential-mode inductor, the other end of the first Y capacitor is connected with one end of the second Y capacitor, the other end of the second Y capacitor is respectively connected with the analog ground and one end of the second differential-mode inductor, and a common pin formed by connecting the first Y capacitor and the second Y capacitor in series is connected to an aluminum shell of a product; the other end of the first differential mode inductor is connected with the anode of the electrolytic capacitor, and the other end of the second differential mode inductor is connected with the cathode of the electrolytic capacitor; the positive pole of the electrolytic capacitor is connected with the positive pole wiring terminal of the energy storage electrolytic capacitor, the negative pole of the electrolytic capacitor is connected with the negative pole wiring terminal of the energy storage electrolytic capacitor, and the third X capacitor is connected between the positive pole wiring terminal of the energy storage electrolytic capacitor and the negative pole wiring terminal of the energy storage electrolytic capacitor in parallel.
Furthermore, the common pin of the first Y capacitor and the second Y capacitor after being connected in series is connected to the aluminum shell of the product through a bolt.
Further, the TVS tube is a transient diode.
Furthermore, the positive connecting terminal of the energy storage electrolytic capacitor and the negative connecting terminal of the energy storage electrolytic capacitor are used as power output after switching and filtering of the double power supplies and are used by external equipment.
Further, the dual-power switching circuit with the direct-current EMI power filter is arranged in a product, wherein the first power supply and the second power supply are respectively connected into the product through two-way input aerial sockets.
Further, the electrolytic capacitor is fixed in the product through a base.
The utility model provides a dual supply switching circuit with direct current EMI power filter has following advantage:
(1) the dual-power switching circuit has simple structure and good applicability, and can be used in hot backup occasions;
(2) the dual power supplies are automatically switched, manual control is not needed, the response is fast, the energy storage of the super capacitor can ensure the power supply capacity in a high-power environment, the voltage fluctuation, the clutter suppression and the power supply providing driving force during the sudden addition and discharge of the power supply can be prevented, and the system power failure or disturbance interference is avoided;
(3) the EMI power filter can reduce the interference during power switching and reduce common mode and differential mode interference.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention.
Fig. 1 is a schematic structural diagram of a dual power switching circuit in the prior art.
Fig. 2 is the utility model provides a two switching of power circuit's schematic diagram with direct current EMI power filter.
Description of reference numerals: 1-common cathode wiring terminal of double diode; 2-a common ground connection terminal for the dual power supplies; 3-TVS tube; 4-a filter capacitor; 5-common mode choke; 6-a bleed-off resistance; 7-first Y capacitance; 8-a first differential mode inductance; 9-electrolytic capacitance; 10-energy storage electrolytic capacitor positive terminal; 11-product aluminum shell; 12-a first X capacitance; 13-a second X capacitance; 14-a second Y capacitance; 15-analog ground; 16-a second differential mode inductance; 17-energy storage electrolytic capacitor negative pole wiring terminal; 18-third X capacitance.
Detailed Description
To further illustrate the technical means and effects of the present invention for achieving the objectives of the present invention, the following detailed description will be given, with reference to the accompanying drawings and preferred embodiments, to the specific embodiments, structures, features and effects of the dual power switching circuit with dc EMI power filter according to the present invention. It is to be understood that the embodiments described are only some of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.
In the present embodiment there is provided a dual power switching circuit with a dc EMI power filter, as shown in FIG. 2, the dual power supply switching circuit with the DC EMI power filter comprises a first power supply, a second power supply, a dual diode, a common cathode connection terminal 1 of the dual diode, a common ground connection terminal 2 of the dual power supply, a TVS tube 3, a filter capacitor 4, a common mode choke coil 5, a bleeder resistor 6, a first Y capacitor 7, a first differential mode inductor 8, an electrolytic capacitor 9, an energy storage electrolytic capacitor anode connection terminal 10, a product aluminum shell 11, a first X capacitor 12, a second X capacitor 13, a second Y capacitor 14, an analog ground 15, a second differential mode inductor 16, an energy storage electrolytic capacitor cathode connection terminal 17 and a third X capacitor 18, the anode of the first power supply and the anode of the second power supply are respectively connected to the anode of the double diode, and the cathode of the double diode is connected to one end of a common cathode wiring terminal 1 of the double diode; the negative pole of the first power supply and the negative pole of the second power supply are simultaneously connected to one end of a public ground wiring terminal 2 of the double power supplies; the TVS tube 3 is used as an overvoltage protection device and is connected in parallel between a common cathode connecting terminal 1 of the double diodes and a common ground connecting terminal 2 of a double power supply, the filter capacitor 4 and the first X capacitor 12 are both connected in parallel with the TVS tube 3, the other end of the common cathode connecting terminal 1 of the double diodes is connected with a first common mode end of the common mode choke coil 5, the other end of the common ground connecting terminal 2 of the double power supply is connected with a fourth common mode end of the common mode choke coil 5, one end of the second X capacitor 13 and the bleeder resistor 6 after being connected in parallel is connected with a second common mode end of the common mode choke coil 5, the other end of the second X capacitor and the bleeder resistor is respectively connected with a third common mode end of the common mode choke coil 5 and an analog ground 15, and the third common mode end of the common mode choke coil 5 is connected with the analog ground 15; a second common-mode end of the common-mode choke coil 5 is respectively connected with one end of the first Y capacitor 7 and one end of the first differential-mode inductor 8, the other end of the first Y capacitor 7 is connected with one end of the second Y capacitor 14, the other end of the second Y capacitor 14 is respectively connected with the analog ground 15 and one end of the second differential-mode inductor 16, wherein a common pin of the first Y capacitor 7 and the second Y capacitor 14 after being connected in series is connected to the product aluminum shell 11; the other end of the first differential mode inductor 8 is connected with the anode of the electrolytic capacitor 9, and the other end of the second differential mode inductor 16 is connected with the cathode of the electrolytic capacitor 9; the positive pole of the electrolytic capacitor 9 is connected with the positive pole wiring terminal 10 of the energy storage electrolytic capacitor, the negative pole of the electrolytic capacitor 9 is connected with the negative pole wiring terminal 17 of the energy storage electrolytic capacitor, and the third X capacitor 18 is connected in parallel between the positive pole wiring terminal 10 of the energy storage electrolytic capacitor and the negative pole wiring terminal 17 of the energy storage electrolytic capacitor.
Preferably, the common pin of the first Y capacitor 7 and the second Y capacitor 14 connected in series is bolted to the product aluminum housing 11.
Preferably, the TVS tube 3 is a transient diode.
Preferably, the positive terminal 10 of the energy storage electrolytic capacitor and the negative terminal 17 of the energy storage electrolytic capacitor are used as power output after switching and filtering of the double power supplies, and are used by external equipment.
Preferably, the dual power switching circuit with the dc EMI power filter is disposed in a product, wherein the first power supply and the second power supply are respectively connected to the inside of the product through two-way input plugs.
Preferably, electrolytic capacitor 9 passes through the base to be fixed in the product, wherein, electrolytic capacitor 9 is energy storage electrolytic capacitor, and energy storage electrolytic capacitor need fix in the product through base or other modes because of size problem to guarantee not to rock and short circuit to the product shell, internal connection passes through the wire and connects.
It should be noted that, because the power of the double diode is relatively high, the heat dissipation area of the product needs to be tightly attached to the aluminum housing 11 of the product for heat dissipation, and is fixed by bolts.
The EMI power filter is a passive bidirectional multiport network filter device composed of an inductor and a capacitor.
The utility model provides a dual power supply switching circuit with direct current EMI power filter's theory of operation as follows:
(1) the double diodes are used for input isolation of double power supplies, can play a role of preventing reverse connection, and can be automatically switched to one path of high voltage for output when two voltages are inconsistent without influencing the other path; the high-power TVS tube is used as an overvoltage protection device, so that the input of overhigh power supply voltage can be prevented, and the clamping protection of the power supply voltage is realized before a rear-stage device is damaged; in order to switch the power supply when the product outputs large load power without the power failure of the product, a low internal resistance, large-capacity electrolytic capacitor or super capacitor is selected as an energy storage unit to stably transition the power supply in an ms-level unit, and simultaneously, the large-capacity capacitor can absorb the surge flowing into the product due to the characteristic that the voltage of the large-capacity capacitor cannot suddenly change; the diodes, the TVS tube and the large capacitor are matched with each other to realize the functions of dual-power isolation, switching, overvoltage protection and filtering;
(2) introducing a common mode choke and a differential mode inductor: a choke coil is a low-impedance coil for attenuating a high-frequency current in a circuit, and in order to improve its inductance, the choke coil generally has a core made of a soft magnetic material, and a common mode choke coil has a plurality of identical coils in which a common mode signal current flows in opposite directions, so that magnetic fields formed by the choke coils are superimposed on each other, and the common mode choke coil has a very high inductance with respect to such a common mode current; when the differential mode signals flow, the magnetic fluxes in the magnetic rings are mutually offset, and almost no inductance can be considered, so that the differential mode signals can pass through without attenuation, only common mode interference signals are filtered, and the EMC capability of the system is improved; similarly, a proper differential mode inductor is selected to filter out a corresponding differential mode signal;
(3) safety X, Y capacitance: the X capacitor has larger voltage ripple current resistance, square shape and larger volume, but has larger allowable instantaneous charge-discharge current and correspondingly smaller internal resistance, and generally has the function of eliminating differential mode interference by being connected to two ends of an input line in a circuit; the Y capacitor is usually a circular high-voltage ceramic chip capacitor, is connected to a wire with large wiring interference, is connected between an input line and a ground wire and is used for eliminating common-mode interference; x, Y the capacitor is used as a power supply overline circuit, an EMI filtering circuit, a spark eliminating circuit and the like to ensure that the finished product of the electronic product meets the EMC requirement;
(4) selecting a common mode choke coil and a differential mode inductor with proper parameters, and matching with X, Y capacitor, the common mode choke coil and the differential mode inductor can be used as LC and pi type filter networks to form a low pass filter or a band pass filter to jointly form a filter network to reduce EMI/EMC interference;
(5) in order to avoid the damage of the energy storage element to the external equipment and the human body after the power supply is in accidental power failure and the load is in power failure, the introduction of the bleeder resistor can help the stored energy to dissipate by self, and the accidental generation is avoided.
To sum up, the utility model provides a double power supply switching circuit with direct current EMI power filter chooses the high-power diode mode to keep apart two way powers, by the higher priority power supply of the same way of voltage, need not external control during the power switching to provide the energy by external supplementary energy storage device and prevent voltage fluctuation, clutter suppression, power supply provide drive power when suddenly unloading in the switching process, avoid the system to fall the electricity or receive disturbance interference, guarantee that ECU does not shut down when switching; adding a power filter to absorb interference to pass an EMC test; the dual-power switching circuit has simple structure and good applicability, and can be used in hot backup occasions; the double-power-supply switching circuit with the direct-current EMI power filter is redesigned due to the fact that a proper shell size is not available on a map of an existing product, a power device with high power and an energy storage element can be installed, a voltage switching diode, a TVS (transient voltage suppressor) tube, an ampere rule capacitor, a common mode choke coil, a differential mode inductor, a bleeder resistor and an external energy storage capacitor are arranged in the double-power-supply switching circuit, the double-power-supply switching circuit is in butt joint with the existing product through a wiring harness and an aerial plug connector and serves as a part of an auxiliary power device to jointly complete the functions of double-power supply switching, EMC (electro magnetic compatibility) and EMI (electro magnetic interference) protection, the process of redevelopment of products is avoided, a power network can be matched with other products, and the working reliability in an EMC (electro magnetic compatibility) environment can be enhanced through multi-parameter configuration.
The above description is only a preferred embodiment of the present invention, and the present invention is not limited to the above embodiments, and although the present invention has been disclosed with the preferred embodiments, it is not limited to the present invention, and any skilled person in the art can make some modifications or equivalent embodiments without departing from the scope of the present invention, but all the technical matters of the present invention are within the scope of the present invention.
Claims (6)
1. A double-power-supply switching circuit with a direct-current EMI power filter is characterized by comprising a first power supply, a second power supply, double diodes, a common cathode wiring terminal (1) of the double diodes, a common ground wiring terminal (2) of the double power supplies, a TVS (3), a filter capacitor (4), a common mode choke coil (5), a bleeder resistor (6), a first Y capacitor (7), a first differential mode inductor (8), an electrolytic capacitor (9), an energy storage electrolytic capacitor anode wiring terminal (10), a product aluminum shell (11), a first X capacitor (12), a second X capacitor (13), a second Y capacitor (14), an analog ground (15), a second differential mode inductor (16), an energy storage electrolytic capacitor cathode wiring terminal (17) and a third X capacitor (18), wherein the anode of the first power supply and the anode of the second power supply are respectively connected to the anodes of the double diodes, the cathode of the double diode is connected to one end of a common cathode wiring terminal (1) of the double diode; the negative pole of the first power supply and the negative pole of the second power supply are simultaneously connected to one end of a common ground wiring terminal (2) of the double power supplies; the TVS tube (3) is connected in parallel between a common cathode connecting terminal (1) of the double diode and a common ground connecting terminal (2) of a double power supply as an overvoltage protection device, the filter capacitor (4) and the first X capacitor (12) are connected with the TVS tube (3) in parallel, the other end of the common cathode connecting terminal (1) of the double diodes is connected with the first common mode end of the common mode choke coil (5), the other end of the common ground terminal (2) of the double power supplies is connected with the fourth common mode end of the common mode choke coil (5), one end of the second X capacitor (13) and the bleeder resistor (6) which are connected in parallel is connected with the second common mode end of the common mode choke coil (5), the other end of the second X capacitor is respectively connected with the third common mode end of the common mode choke coil (5) and the analog ground (15), the third common mode end of the common mode choke (5) is connected with an analog ground (15); a second common-mode end of the common-mode choke coil (5) is respectively connected with one end of the first Y capacitor (7) and one end of the first differential-mode inductor (8), the other end of the first Y capacitor (7) is connected with one end of the second Y capacitor (14), the other end of the second Y capacitor (14) is respectively connected with the analog ground (15) and one end of the second differential-mode inductor (16), and a common pin formed by connecting the first Y capacitor (7) and the second Y capacitor (14) in series is connected to a product aluminum shell (11); the other end of the first differential mode inductor (8) is connected with the anode of the electrolytic capacitor (9), and the other end of the second differential mode inductor (16) is connected with the cathode of the electrolytic capacitor (9); the positive pole of electrolytic capacitor (9) with energy storage electrolytic capacitor positive pole binding post (10) link to each other, the negative pole of electrolytic capacitor (9) with energy storage electrolytic capacitor negative pole binding post (17) link to each other, third X electric capacity (18) connect in parallel between energy storage electrolytic capacitor positive pole binding post (10) and energy storage electrolytic capacitor negative pole binding post (17).
2. The dual power supply switching circuit with the direct current EMI power filter is characterized in that a common pin of the first Y capacitor (7) and the second Y capacitor (14) which are connected in series is bolted on the product aluminum shell (11).
3. The dual power switching circuit with the direct current EMI power filter as claimed in claim 1, wherein the TVS tube (3) is a transient diode.
4. The dual power supply switching circuit with the direct current EMI power filter as claimed in claim 1, wherein the positive terminal (10) of the energy storage electrolytic capacitor and the negative terminal (17) of the energy storage electrolytic capacitor are used as the output of the power supply after switching and filtering of the dual power supply, and are used by external equipment.
5. The dual power switching circuit with a dc EMI power filter of claim 1, wherein the dual power switching circuit with a dc EMI power filter is disposed in a product, and wherein the first power supply and the second power supply are respectively connected to the inside of the product through two-way input plugs.
6. The dual power switching circuit with DC EMI power filter as claimed in claim 5, wherein the electrolytic capacitor (9) is fixed in the product by a base.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120221327.7U CN214850612U (en) | 2021-01-26 | 2021-01-26 | Dual-power switching circuit with direct-current EMI power filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120221327.7U CN214850612U (en) | 2021-01-26 | 2021-01-26 | Dual-power switching circuit with direct-current EMI power filter |
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| Publication Number | Publication Date |
|---|---|
| CN214850612U true CN214850612U (en) | 2021-11-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120221327.7U Active CN214850612U (en) | 2021-01-26 | 2021-01-26 | Dual-power switching circuit with direct-current EMI power filter |
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| Country | Link |
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| CN (1) | CN214850612U (en) |
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2021
- 2021-01-26 CN CN202120221327.7U patent/CN214850612U/en active Active
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