CN211628989U - High-power intermediate relay of AC/DC load - Google Patents
High-power intermediate relay of AC/DC load Download PDFInfo
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- CN211628989U CN211628989U CN202020592001.0U CN202020592001U CN211628989U CN 211628989 U CN211628989 U CN 211628989U CN 202020592001 U CN202020592001 U CN 202020592001U CN 211628989 U CN211628989 U CN 211628989U
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Abstract
The utility model provides a high-power intermediate relay of an AC/DC load, which comprises a first relay, an energy consumption resistance circuit, a starting voltage regulating circuit, an output circuit and a relay switch circuit connected between the energy consumption resistance circuit and the starting voltage regulating circuit; the energy consumption resistance circuit comprises a first resistor and a second resistor which are connected in parallel, one end of the energy consumption resistance circuit is connected to the positive end of the power supply, and the other end of the energy consumption resistance circuit is connected to the normally closed node of the first relay after being connected with a diode in series; the starting voltage regulating circuit is connected with the energy consumption resistance circuit in parallel, then is connected with the starting voltage regulating circuit in series and then is connected to a normally open node of the first relay, and the output circuit is provided with a second relay and a third relay and is connected between the normally open node of the first relay and a negative end of a power supply; wherein one of the second relay and the third relay has a magnetic quenching mechanism. The utility model discloses both guarantee the requirement of action voltage, satisfy the area load ability of alternating current-direct current load simultaneously.
Description
Technical Field
The utility model relates to a relay technical field particularly relates to a high-power auxiliary relay of alternating current-direct current load.
Background
The intermediate relay is generally used in relay protection and automatic control systems, and plays a role in safety protection and conversion. In the application process, the intermediate relay is integrated with a resistor/capacitor/semiconductor device and a terminal, for example, to form a power relay circuit, which is applied to a loop of a power system, but due to the interference of a secondary loop, for example, the transient interference voltage caused by the contact breaking inductance element of a relay or a contactor, particularly, the high-frequency traveling wave of a high-voltage bus caused by short circuit and lightning stroke in a primary system, the interference of a 380V alternating current system in a direct current loop, and the interference caused by communication equipment and a high-frequency carrier machine of a transformer substation, the action of the relay is unqualified, and the relay does not conform to the safety regulation of a direct trip loop required by a national power grid, for example, the alternating current input is reliable and non-action (the highest alternating current input voltage is the same as the direct current rated voltage, for example, the highest; the operating voltage is 55-65% of the rated voltage.
Therefore, the realization of anti-interference in the intermediate relay is a research and continuous improvement in the industry, for example, a relay anti-interference circuit proposed in CN204927184, which only uses a resistor to solve the problem of anti-interference, has poor anti-interference effect, and has no relation to the situation of ac interference input. The relay proposed by CN207993771U is only limited in load capacity by ac load, for example, the typical load capacity is 5-10A/250VAC, 0.1A/220VDC, while the dc load usually has the requirement of 2-6A/VDC, so that it is usually difficult to apply the dc load.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a high-power auxiliary relay of alternating current-direct current load had both guaranteed the requirement of action voltage, satisfied the area load ability of alternating current-direct current load simultaneously.
In order to achieve the above object, the utility model adopts the following technical scheme:
a high-power intermediate relay of an AC/DC load comprises a first relay, an energy consumption resistance circuit, a starting voltage regulating circuit, an output circuit and a relay switch circuit connected between the energy consumption resistance circuit and the starting voltage regulating circuit; wherein:
the energy consumption resistance circuit comprises a first resistor and a second resistor which are connected in parallel, one end of the energy consumption resistance circuit is connected to the positive end of the power supply, and the other end of the energy consumption resistance circuit is connected to the normally closed node of the first relay after being connected with a diode in series;
the starting voltage regulating circuit is connected with the energy consumption resistance circuit in parallel, then connected with the starting voltage regulating circuit in series and then connected to a normally open node of the first relay, and the output circuit is provided with a second relay and a third relay and is connected between the normally open node of the first relay and a negative end of a power supply;
wherein at least one of the second relay and the third relay has a magnetic quenching mechanism.
Preferably, the resistance parameters of the first resistor and the second resistor in the energy consumption resistor circuit are the same, and glass glaze power resistors are adopted.
Preferably, the resistance parameters of the first resistor and the second resistor in the energy consumption resistor circuit are determined according to the rated voltage of the intermediate relay.
Preferably, the starting voltage regulating circuit comprises two starting resistors which are connected in parallel and have the same resistance value, and both the two starting resistors are metal film resistors or high-resistance glass glaze resistors.
Preferably, the relay switch circuit comprises a three-way parallel freewheeling circuit, a capacitor and a coil of the first relay.
Preferably, when the rated voltage of the intermediate relay is higher than 48V, the freewheeling circuit comprises a freewheeling diode connected in reverse and a protection resistor connected in series with the freewheeling diode.
Preferably, when the rated voltage of the intermediate relay is lower than 48V, the freewheel circuit includes a reverse-connected freewheel diode.
Preferably, the coils of the second relay and the third relay are connected with the same freewheeling circuit in the relay switch circuit in parallel.
It should be understood that all combinations of the foregoing concepts and additional concepts described in greater detail below can be considered as part of the inventive subject matter of the present disclosure unless such concepts are mutually inconsistent. In addition, all combinations of claimed subject matter are considered a part of the inventive subject matter of this disclosure.
The foregoing and other aspects, embodiments and features of the present teachings can be more fully understood from the following description taken in conjunction with the accompanying drawings. Additional aspects of the present invention, such as features and/or advantages of exemplary embodiments, will be apparent from the description which follows, or may be learned by practice of the specific embodiments in accordance with the teachings of the present invention.
Drawings
The drawings are not intended to be drawn to scale. In the drawings, each identical or nearly identical component that is illustrated in various figures may be represented by a like numeral. For purposes of clarity, not every component may be labeled in every drawing. Embodiments of various aspects of the present invention will now be described, by way of example, with reference to the accompanying drawings, in which:
fig. 1 is a schematic diagram of a high-power intermediate relay for ac/dc loads according to the present invention.
Fig. 2 is a schematic circuit diagram of a first embodiment of the high-power intermediate relay for ac/dc loads according to the present invention.
Fig. 3 is a schematic circuit diagram of a second embodiment of the high-power intermediate relay for ac/dc loads according to the present invention.
Fig. 4 is a schematic circuit diagram of the relay output circuit of the present invention.
Detailed Description
For a better understanding of the technical content of the present invention, specific embodiments are described below in conjunction with the accompanying drawings.
In this disclosure, aspects of the present invention are described with reference to the accompanying drawings, in which a number of illustrative embodiments are shown. Embodiments of the present disclosure are not necessarily intended to include all aspects of the invention. It should be appreciated that the various concepts and embodiments described above, as well as those described in greater detail below, may be implemented in any of numerous ways, as the disclosed concepts and embodiments are not limited to any implementation. Additionally, some aspects of the present disclosure may be used alone or in any suitable combination with other aspects of the present disclosure.
With reference to the schematic diagrams of the intermediate relay of the examples shown in fig. 1-3, the utility model discloses a high-power intermediate relay of ac/dc load, including first relay, energy consumption resistance circuit, starting voltage regulating circuit, output circuit and the relay switch circuit of connection between energy consumption resistance circuit and starting voltage regulating circuit. In the examples shown in fig. 2 and 3, we illustrate low voltage 24VDC (rated voltage below 48V) and high voltage case (rated voltage 220 VDC).
Referring to fig. 1 and 2, the energy consumption resistance circuit includes a first resistor RP1 and a second resistor RP2 connected in parallel, one end of the energy consumption resistance circuit is connected to the positive terminal of the power supply, the other end of the energy consumption resistance circuit is connected in series with a diode D2 and then connected to the normally closed node NC of the first relay KM1, and the start power control and regulation are performed through the energy consumption resistance circuit.
Preferably, the resistance parameters of the first resistor RP1 and the second resistor RP2 are the same, and both adopt glass glaze power resistors or metal oxide film resistors. And parameters of the first resistor and the second resistor are matched and determined according to the rated voltage of the intermediate relay and the starting power of more than 5W.
For example, as shown in FIG. 2, a 75 ohm resistance of the metal film is selected for a nominal voltage of 48 VDC. In another embodiment, the resistance value is selected based on a starting power of 5W at rated power.
In another embodiment, a high resistance glass-enamel power resistor of 5.5-5.6 kilo ohms is selected for the resistance value, for example, at a nominal voltage of 220 VDC.
As shown in fig. 2, the diode D2 connected in series in the power consumption resistor circuit is preferably connected in series in a forward mode, for example, a diode of 1N5391, 1N5393(1.5A, 50-1000V).
With reference to fig. 1 and 2, the starting voltage regulating circuit is connected in parallel with the energy consumption resistance circuit, then connected in series with the starting voltage regulating circuit, and then connected to the normally open node NO of the first relay KM 1.
The output circuit incorporating the example shown in fig. 3 has the second relay KM2 and the third relay KM3, and is connected between the normally open node NO of the first relay KM1 and the negative power supply terminal DC-; the coils of the second relay KM2 and the third relay KM3 are both connected in parallel with a follow current circuit which is the same as that in the relay switch circuit.
At least one of the second relay KM2 and the third relay KM3 has a magnetic arc extinguishing mechanism. For example, under the rated voltage of low voltage, 2 pieces of the arc extinguishing chamber can be selected to be provided with magnetic arc extinguishing, and under the high voltage, one of the arc extinguishing chambers adopts the magnetic arc extinguishing function.
Referring to fig. 2, the starting voltage regulating circuit includes two parallel starting resistors (RQ1, RQ2), both glass-glaze resistors or metal oxide film resistors. In order to achieve the starting voltage requirement of 55% -65%, the starting voltage can be accompanied at different rated voltages. For example, under a rated voltage of 24VDC, the resistance parameter of the starting resistor is the same, and is selected to be 650 + 850 ohm, preferably selected from metal film resistors such as RJ12 and RJ 15. The resistance parameter of the starting resistor can be selected to be a 50-56 kilo-ohm glass glaze resistor with a rated power of 3-5W under the rated voltage of 220 VDC.
Preferably, the appliance switching circuit comprises a three-way parallel freewheeling circuit, a capacitor C1 and a coil of the first relay. The follow current circuit can be designed differently according to different rated voltages. As shown in connection with fig. 3, when the rated voltage is higher than 48VDC, a freewheeling diode D1 connected in reverse and a protection resistor R1 connected in series with the freewheeling diode are included.
When the rated voltage is lower than 48VDC, the freewheel circuit may include a freewheel diode D1 connected in reverse without providing a protection resistor R1 connected in series with the freewheel diode.
Preferably, the freewheeling diode D1 is chosen to be a diode of the type 1N4007 (1A, 50-1000V) or 1N5393(1.5A, 50-1000V). The resistance parameter of the protection resistor R1 is 250-300 omega. In the present invention, the protection resistor R1 is 260 Ω.
Capacitor C1 preferably has a capacitance parameter of 160uF, 20VDC, such as using the panasonic EEU series capacitor or the company capacitor available from RUBYCON corporation.
Preferably, in the selection of the relays, according to the design of rated voltage, for example, the first relay adopts a macro-hair, loose-hair or ohm-dragon power relay, such as a macro-hair HF118F012-1ZS1, a loose-hair HJ2-AC12V, an ohm-dragon model G5NB-1A-24VDC, a G2R-1E-DC 24V relay, and at least one of the second relay and the third relay adopts a magnetic arc extinguishing relay, such as a Shen electric REH magnetic arc extinguishing relay, the loading capacity of which can reach 16A/400VAC and 10A/220 VDC.
Although the present invention has been described with reference to the preferred embodiments, it is not intended to limit the present invention. The present invention is intended to cover by those skilled in the art various modifications and adaptations of the invention without departing from the spirit and scope of the invention. Therefore, the protection scope of the present invention is subject to the claims.
Claims (9)
1. A high-power intermediate relay of an AC/DC load is characterized by comprising a first relay, an energy consumption resistance circuit, a starting voltage regulating circuit, an output circuit and a relay switch circuit connected between the energy consumption resistance circuit and the starting voltage regulating circuit; wherein:
the energy consumption resistance circuit comprises a first resistor and a second resistor which are connected in parallel, one end of the energy consumption resistance circuit is connected to the positive end of the power supply, and the other end of the energy consumption resistance circuit is connected to the normally closed node of the first relay after being connected with a diode in series;
the starting voltage regulating circuit is connected with the energy consumption resistance circuit in parallel, then connected with the starting voltage regulating circuit in series and then connected to a normally open node of the first relay, and the output circuit is provided with a second relay and a third relay and is connected between the normally open node of the first relay and a negative end of a power supply;
wherein at least one of the second relay and the third relay has a magnetic quenching mechanism.
2. The high-power intermediate relay of AC/DC load according to claim 1, wherein the first resistor and the second resistor in the power consumption resistor circuit have the same resistance parameter and are both power resistors.
3. The high-power intermediate relay of AC/DC load as recited in claim 2, wherein the resistance parameters of the first resistor and the second resistor in the power consumption resistor circuit are determined according to the rated voltage of the intermediate relay.
4. The high-power intermediate relay of AC/DC load according to claim 1, wherein said starting voltage regulating circuit comprises two parallel starting resistors with the same resistance, both of which are high-resistance glass-glaze resistors or metal-film resistors.
5. The high power intermediate relay for AC/DC loads according to any one of claims 1-4, wherein said relay switch circuit comprises a three-way parallel connection of a freewheeling circuit, a capacitor and the coil of the first relay.
6. The high power intermediate relay for AC/DC loads according to claim 5, wherein said freewheel circuit comprises a reverse-connected freewheel diode and a protection resistor connected in series with the freewheel diode when the rated voltage of said intermediate relay is higher than 48V.
7. The high-power intermediate relay of AC/DC load as recited in claim 6, wherein said freewheeling diode is a 1N4007 type diode, and the resistance parameter of the protection resistor is 250-300 ohms.
8. The high power intermediate relay for AC/DC loads according to claim 6, wherein said freewheeling circuit includes freewheeling diodes connected in reverse when the rated voltage of said intermediate relay is lower than 48V.
9. The high power intermediate relay of AC/DC load as claimed in claim 6, wherein the coils of said second and third relays are connected in parallel with the same freewheeling circuit as that of the relay switch circuit.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020592001.0U CN211628989U (en) | 2020-04-20 | 2020-04-20 | High-power intermediate relay of AC/DC load |
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| CN202020592001.0U CN211628989U (en) | 2020-04-20 | 2020-04-20 | High-power intermediate relay of AC/DC load |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114446712A (en) * | 2022-04-08 | 2022-05-06 | 深圳市恒讯通电子有限公司 | Adjustable steady voltage auto-power-off relay |
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- 2020-04-20 CN CN202020592001.0U patent/CN211628989U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114446712A (en) * | 2022-04-08 | 2022-05-06 | 深圳市恒讯通电子有限公司 | Adjustable steady voltage auto-power-off relay |
| CN114446712B (en) * | 2022-04-08 | 2022-07-22 | 深圳市恒讯通电子有限公司 | Adjustable steady voltage auto-power-off relay |
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