Contact expansion circuit for ATS
By introducing a combination circuit of relays and auxiliary contacts into ATS products, the problem of insufficient number of auxiliary contacts was solved, the circuit was simplified and the reliability was improved, and the cost was reduced.
Patent Information
- Application Number
- CN202520412987.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-11
- Publication Date
- 2026-02-06
- Estimated Expiration
- 2035-03-11
AI Technical Summary
The limited number of auxiliary contacts in existing ATS products leads to complex and unstable circuit designs, making it difficult to meet the requirements for safety insulation and functional expansion.
An extended circuit is constructed using auxiliary contacts and relays. By utilizing the combination of relay coils and contacts, reliable signal transmission and status identification are achieved, avoiding the use of additional switching devices.
It achieves simple, low-cost, and reliable contact expansion, meeting the multi-contact functional requirements of ATS products and reducing the failure rate.
Smart Images
Figure CN223885178U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to the ATS technical field, especially an ATS contact expansion circuit. BACKGROUND
[0002] ATS (Automatic Transfer Switch, ATS for short) is an automatic transfer switch, and the main function is to automatically switch the load from one power supply to another power supply. When the normal power supply system encounters a failure to stop power supply, the ATS will automatically connect the load circuit to another standby power supply to ensure that the connected equipment can continue to operate normally and uninterruptedly.
[0003] The products in the industrial scene often use auxiliary contacts, but due to the limitations of size and cost, the number of auxiliary contacts is limited. In the ATS product, the PC-level switch often uses the OFF auxiliary contact, which is generally used to indicate the current state of the switch; in the CB-level product, in addition to the OFF contact, there is also an SDE auxiliary contact (fault indication contact) and an SD auxiliary contact (trip indication contact) to indicate whether the switch has an electrical fault.
[0004] Generally, there are two groups of OFF contacts in a PC-level ATS, one group is reserved for the user to facilitate the user to detect the state of the switch, facilitate indication and management; one group is used as a controller indication. But generally, the switch needs to have electrical interlocking and mechanical interlocking to ensure that the switch will not appear double combination phenomenon. At this time, the number of one group of OFF contacts needs to be used as electrical interlocking, and also needs to be used as controller indication. At this time, the main circuit is a strong electrical signal, and the controller indication needs to consider the problem of voltage reduction and insulation, which will increase the difficulty of circuit design. And when the OFF contact is unstable, it will cause false indication. When the CB-level switch involves SDE auxiliary contact and SD auxiliary contact, the same is true.
[0005] Therefore, an ATS contact expansion circuit with simple circuit, higher reliability and safety insulation is needed. UTILITY MODEL CONTENTS
[0006] The utility model solves the problem of providing an ATS fault output and alarm circuit.
[0007] To solve the above technical problems, the utility model adopts the technical scheme: an ATS contact expansion circuit, including auxiliary contact and relay, the relay includes relay coil and relay contact, the auxiliary contact includes common terminal and normally open point, the OFF signal in the switch is connected to the relay coil, and the auxiliary contact is arranged between the input end of the OFF signal and the relay coil.
[0008] Further, the relay is a normally open relay.
[0009] Further, when the relay is set to one, the pin of the relay coil is connected with the auxiliary contact. When the main switch is closed, the common end of the auxiliary contact is conducted with the normally open point, the relay coil is actuated, the contact of the relay is changed from the normally open point to the normally closed point, and the OFF signal is directly transmitted to the controller.
[0010] Further, when the relay is set to two, the pins of the two relay coils are connected in parallel and connected with the auxiliary contact. When the main switch is closed, the common end of the auxiliary contact is conducted with the normally open point, the two relay coils are simultaneously actuated, the contacts of the two relays are both changed from the normally open point to the normally closed point, the signal of the auxiliary contact is no longer directly connected to the controller, and the signal of the relay is connected to the controller for state recognition.
[0011] By adopting the technical scheme, the utility model has the following beneficial effects:
[0012] The utility model discloses an extension circuit built by auxiliary contact OFF and relay, which has low cost, reliable principle, simple circuit, and does not need to use switch devices such as triode and MOS tube for control except auxiliary contact OFF and relay, so that the cost optimization is greatly improved, and the use scene with insufficient contact quantity but more function requirements is met. BRIEF DESCRIPTION OF DRAWINGS
[0013] The utility model will be more obvious in the advantages and implementation manners by referring to the drawings and combining examples, wherein the contents shown in the drawings are only used for explaining and describing the utility model and do not constitute any sense of limitation to the utility model, and in the drawings:
[0014] Figure 1 It is the circuit schematic view of the utility model embodiment 1.
[0015] Figure 2 It is the circuit schematic view of the utility model embodiment 2. CONCRETE EMBODIMENT
[0016] The utility model discloses a contact extension circuit for ATS, which comprises an auxiliary contact and a relay, the relay comprises a relay coil and a relay contact, the auxiliary contact comprises a common end and a normally open point, an OFF signal in a switch is connected to the relay coil, and the auxiliary contact is arranged between the input end of the OFF signal and the relay coil.
[0017] The relay is a normally open relay.
[0018] When the relay is set to one, the pin of the relay coil is connected with the auxiliary contact.
[0019] Further, when the main switch is closed, the common terminal of the auxiliary contact is connected with the normally open terminal, the relay coil is actuated, and the contact of the relay is changed from the normally open terminal to the normally closed terminal. The OFF signal is directly transmitted to the controller.
[0020] When two relays are provided, the pins of the relay coils are connected in parallel and connected with the auxiliary contact.
[0021] Further, when the main switch is closed, the common terminal of the auxiliary contact is connected with the normally open terminal, the relay coil is actuated, and the contact of the relay is changed from the normally open terminal to the normally closed terminal. The OFF signal is directly transmitted to the controller.
[0022] Working principle:
[0023] The OFF signal in the switch is connected to the relay coil. The normally open or normally closed terminal of the connected signal and the type of the contact of the relay are determined by the switching characteristics. In this case, the normally open terminal of the OFF signal is connected to the relay coil circuit, and the type of the relay is normally open.
[0024] The contact expansion circuit has two implementation modes, mainly including the micro-motion type direct drive and the relay expansion.
[0025] Embodiment 1:
[0026] As shown in Figure 1 When the main switch is closed, the common terminal (COM) of the auxiliary contact OFF1 is connected with the normally open terminal (NO). At this time, the relay RELAY1 coil is actuated, and the contact 3 and the contact 4 of the relay RELAY1 are changed from the NO to the normally closed terminal (NC). At this time, the OFF signal is directly input to the controller. Since the relay RELAY1 coil uses a low-voltage weak electric signal Vdd (voltage range is 5-60V), the working voltage of the auxiliary contact OFF1 is the same as the voltage of the relay RELAY1 coil. The controller can normally identify the state of the current switch through the internal feedback loop. At this time, the signals of the contact 3 and the contact 4 of the relay RELAY1 can be connected to the main loop for interlocking. At this time, only one relay RELAY1 is needed to achieve the interlocking. If it is worried that the main loop will work abnormally after the relay RELAY1 fails, the relays can be connected in parallel to reduce the failure rate. This method needs to meet the insulation requirements of the distance between the coil and the contact.
[0027] Embodiment 2:
[0028] As shown in Figure 2As shown, the relay RELAY2 and the relay RELAY3 are used in parallel, when the main switch is closed, the COM end of the auxiliary contact OFF2 is conducted with the NO point, at this time the coil 1 foot and the coil 2 foot of the relay RELAY2 and the relay RELAY3 are simultaneously actuated, the contact 3 and the contact 4 foot of the relay RELAY2 and the relay RELAY3 are changed from NO to NC, at this time the signal of the auxiliary contact OFF2 is no longer directly connected to the controller, but the signal of the relay is connected to the controller to identify the state, for example, the relay RELAY2 contact is used as the main circuit interlock, and the relay RELAY3 contact signal is connected to the controller to be used as the state indication, at this time the contact type of the two relays needs to be selected according to the working principle of the actual circuit.
[0029] The above detailed description of the embodiments of the present application, but the content is only the preferred embodiment of the present application, can not be considered for limiting the scope of the present application. Any equivalent changes and improvements within the scope of the present application should still belong to the scope of the present application.
Claims
1. A contact expansion circuit for an ATS, characterized by: The auxiliary contact and the relay including a relay coil and a relay contact, the auxiliary contact including a common terminal and a normally open terminal, an OFF signal in the switch accessing the relay coil, the auxiliary contact being arranged between the input of the OFF signal and the relay coil.
2. The contact expansion circuit for ATS as claimed in claim 1 wherein: When the relay is arranged as one, the pin of the relay coil is connected with the auxiliary contact.
3. The contact expansion circuit for an ATS of claim 2, wherein: When the main switch is closed, the common terminal of the auxiliary contact is conducted with the normally open terminal, the relay coil is actuated, the contact of the relay is changed from the normally open terminal to the normally closed terminal, and the OFF signal is directly transmitted to the controller.
4. The contact expansion circuit for ATS as claimed in claim 1 wherein: When the relay is arranged as two, the pins of the two relay coils are connected in parallel and then connected with the auxiliary contact.
5. The contact expansion circuit for an ATS of claim 4, wherein: When the main switch is closed, the common terminal of the auxiliary contact is conducted with the normally open terminal, the two relay coils are simultaneously actuated, the contacts of the two relays are both changed from the normally open terminal to the normally closed terminal, the signal of the auxiliary contact is no longer directly transmitted to the controller, and the signal of the relay is transmitted to the controller for state identification.