Automatic change-over switch
By employing a hybrid structure of solid-state devices and relays in the automatic transfer switch, the contact failure problem of the power selection circuit in high-intensity vibration environments is solved, achieving fast response and stable operation, while reducing the size and cost of the power selection circuit.
Patent Information
- Application Number
- CN202520336037.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-28
- Publication Date
- 2026-01-16
- Estimated Expiration
- 2035-02-28
AI Technical Summary
In high-intensity vibration environments, existing automatic transfer switches suffer from contact failures or accidental contact in the power selection circuit, leading to abnormal operation of the power selection circuit. Furthermore, existing technologies require large-volume, high-cost relays to improve vibration resistance.
A hybrid structure using solid-state devices and relays for joint control is adopted. Relays provide mechanical isolation breaks, while solid-state devices provide functional isolation breaks. The power selection circuit is constructed by utilizing the fast conduction characteristics and vibration resistance of solid-state devices.
This invention enables the power selection circuit to respond quickly and operate stably in high-intensity vibration environments, avoiding malfunctions caused by vibration, while also reducing the size and cost of the power selection circuit.
Smart Images
Figure CN223809608U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to an automatic transfer switch. BACKGROUND
[0002] The automatic transfer switch is suitable for important places with high reliability and continuity of power supply, such as data centers, hospitals, fire fighting systems, etc., and when one power supply is abnormal, the automatic transfer switch automatically switches to another normal power supply to supply power to the load. The above-mentioned switching is usually realized by driving the actuator to move by the driving element inside the automatic transfer switch, and the driving element is usually an electromagnet, a motor, etc. Taking a dual power automatic transfer switch as an example, according to the dual power control logic, the power supply selection circuit selects power supply 1 or power supply 2 in the two power supplies to supply power to the driving element in the actuator, and the existing power supply selection circuit is usually composed of a magnetic relay, and its typical circuit structure is shown in Figure 1 The armature contact spring set of the magnetic relay has a rigid-flexible coupling structure, and in a high-intensity vibration environment, the contact failure or false contact phenomenon may occur, that is, when the device where the power supply selection circuit is located is subjected to high-intensity impact vibration, the relay contact may abnormally move, thereby causing the power supply selection circuit to abnormally work, and in order to improve the anti-shock performance, a large-size and high-cost relay is usually used. SUMMARY
[0003] The utility model solves the technical problems in the prior art, and provides an automatic transfer switch, which has higher anti-shock performance, faster response speed, and smaller size and cost.
[0004] The utility model solves the above technical problems by adopting the following technical solutions:
[0005] An automatic transfer switch comprises a driving element for driving an actuator to move to realize power switching, a power output control circuit for controlling the power supply of the driving element, and a power supply selection circuit for selecting one power supply from the first to Nth power supplies as the input power supply of the power output control circuit, and N is an integer greater than or equal to 2; the power supply selection circuit comprises a plurality of power supply selection circuits and the first to Nth solid-state selection circuits connected one by one with the first to Nth power supplies; the plurality of power supply selection circuits are composed of a relay K1 with N input contact pairs and one output contact pair, and the output contact pair of the relay K1 is connected to the two power input ends of the power output control circuit; the i-th solid-state selection circuit is composed of two thyristor groups, each thyristor group is composed of two anti-parallel thyristors, one end of the two thyristor groups is connected to the L line and the N line of the i-th power supply, respectively, and the other end of the two thyristor groups is connected to the i-th input contact pair of the relay K1, i = 1, 2, …, N.
[0006] In one of the embodiments, the power output control circuit comprises a relay K2, a rectifier bridge B1, the normally open contact pair of the relay K2 is connected with the output contact pair of the relay K1, the output contact pair of the relay K2 is connected with the AC input end of the rectifier bridge B1, and the DC output end of the rectifier bridge B1 is connected with the power input end of the driving element.
[0007] Preferably, the driving element is an electromagnet or a motor.
[0008] Compared with the prior art, the utility model has the following beneficial effects:
[0009] The utility model adopts the hybrid structure of solid state device and relay common control to construct the power selection circuit of driving element, provides the mechanical isolation breakpoint of double / multiway power through relay, provides the functional isolation breakpoint of double / multiway power through solid state device, utilizes the characteristics of fast conduction speed of solid state device and no contact not affected by impact vibration, makes the power selection circuit keep fast action and prevent the work abnormality caused by impact vibration. BRIEF DESCRIPTION OF DRAWINGS
[0010] Figure 1 It is a circuit diagram of a prior art double power automatic transfer switch;
[0011] Figure 2 It is a specific implementation circuit diagram of the double power automatic transfer switch of the utility model. DETAILED DESCRIPTION
[0012] In view of the prior art, the utility model adopts the hybrid structure of solid state device and relay common control to construct the power selection circuit of driving element, provides the mechanical isolation breakpoint of double / multiway power through relay, provides the functional isolation breakpoint of double / multiway power through solid state device, utilizes the characteristics of fast conduction speed of solid state device and no contact not affected by impact vibration, makes the power selection circuit keep fast action and prevent the work abnormality caused by impact vibration.
[0013] The technical scheme provided by the utility model is as follows:
[0014] An automatic transfer switch comprises a driving element for driving an actuator to realize power transfer, a power output control circuit for controlling power supply of the driving element, and a power selection circuit for selecting one of the first to N power sources as the input power source of the power output control circuit, N being an integer greater than or equal to 2; the power selection circuit comprises a plurality of power selection circuits and the first to N solid-state selection circuits connected to the first to N power sources one by one; the plurality of power selection circuits are composed of a relay K1 having N input contact pairs and an output contact pair, the output contact pair of the relay K1 being connected to two power input terminals of the power output control circuit; the i-th solid-state selection circuit is composed of two thyristor groups, each of which is composed of two anti-parallel thyristors, one end of the two thyristor groups being connected to the L line and the N line of the i-th power source respectively, the other end of the two thyristor groups being connected to the i-th input contact pair of the relay K1, i = 1, 2, …, N.
[0015] In order to facilitate the public to understand, the technical scheme of the utility model is described in detail below taking a dual-power automatic transfer switch as an example and in combination with the drawings:
[0016] The circuit structure of the dual-power automatic transfer switch in the embodiment is shown in Figure 2 and comprises a first solid-state selection circuit connected to a first power source, a second solid-state selection circuit connected to a second power source, a plurality of power selection circuits, a power output control circuit, and a driving element, wherein the driving element can be an electromagnet or a motor.
[0017] As shown in Figure 2 , the plurality of power selection circuits comprise a relay K1, the normally closed contact pair of the relay K1 being connected to two output terminals of the first solid-state selection circuit, the normally open contact pair of the relay K1 being connected to two output terminals of the second solid-state selection circuit, and the output contact of the relay K1 being connected to the power output control circuit.
[0018] The power output control circuit comprises a relay K2 and a rectifier bridge B1, the normally open contact pair of the relay K2 being connected to the output contact pair of the relay K1, the output contact pair of the relay K2 being connected to the alternating current input terminal of the rectifier bridge B1, and the direct current output terminal of the rectifier bridge B1 being connected to the power input terminal of the driving element.
[0019] The first solid-state selection circuit comprises thyristors SCR1, SCR2, SCR3 and SCR4. The A terminal of the thyristor SCR1 is connected in parallel with the K terminal of the thyristor SCR2, and the connection is connected to 1L of the first power supply. The K terminal of the thyristor SCR1 is connected in parallel with the A terminal of the thyristor SCR2, and the connection is connected to the normally closed contact of the relay K1 of the multi-power supply selection circuit. The A terminal of the thyristor SCR3 is connected in parallel with the K terminal of the thyristor SCR4, and the connection is connected to 1N of the first power supply. The K terminal of the thyristor SCR3 is connected in parallel with the A terminal of the thyristor SCR4, and the connection is connected to the other normally closed contact of the relay K1 of the multi-power supply selection circuit.
[0020] The second solid-state selection circuit comprises thyristors SCR5, SCR6, SCR7 and SCR8. The A terminal of the thyristor SCR5 is connected in parallel with the K terminal of the thyristor SCR6, and the connection is connected to 2L of the second power supply. The K terminal of the thyristor SCR5 is connected in parallel with the A terminal of the thyristor SCR6, and the connection is connected to the normally open contact of the relay K1 of the multi-power supply selection circuit. The A terminal of the thyristor SCR7 is connected in parallel with the K terminal of the thyristor SCR8, and the connection is connected to 2N of the second power supply. The K terminal of the thyristor SCR7 is connected in parallel with the A terminal of the thyristor SCR8, and the connection is connected to the other normally open contact of the relay K1 of the multi-power supply selection circuit.
[0021] When the dual power supply automatic transfer switch is in the first power supply state, the dual power supply automatic transfer switch selects the second power supply as the working power supply for the transfer action. When the first power supply and the second power supply are both normal, the thyristors SCR1-SCR4 are disconnected, the thyristors SCR5-SCR8 are turned on, the relay K1 is attracted to make the normally open contact closed, the relay K2 remains in the released state (normally open), and the driving element is in the non-working state without power supply. When the first power supply is abnormal and the second power supply is normal, the dual power supply automatic transfer switch needs to be transferred from the first power supply to the second power supply. At this time, the relay K2 is closed, and then the second power supply is sent to the driving element after being rectified by the power output control circuit, the driving element drives the actuator to act, and the transfer function of the dual power supply automatic transfer switch is realized.
[0022] When the dual power supply automatic transfer switch is in the second power supply state, the dual power supply automatic transfer switch selects the first power supply as the working power supply for the transfer action. When the first power supply and the second power supply are both normal, the thyristors SCR1-SCR4 are turned on, the thyristors SCR5-SCR8 are disconnected, the relay K1 is released to make the normally closed contact closed, the relay K2 remains in the released state (normally open), and the driving element is in the non-working state without power supply. When the second power supply is abnormal and the first power supply is normal, the dual power supply automatic transfer switch needs to be transferred from the second power supply to the first power supply. At this time, the relay K2 is closed, and then the first power supply is sent to the driving element after being rectified by the power output control circuit, the driving element drives the actuator to act, and the transfer function of the dual power supply automatic transfer switch is realized.
[0023] The utility model discloses technical scheme can be applicable to the condition of dual power supply, also can be applicable to the condition of power supply by multi -way power supply, when power supply by multi -way power supply, only need to increase corresponding solid -state selection circuit and the input contact pair of relay K1, the drive element of the utility model can be one or one or more above, and the power output control circuit correspondingly connected therewith can also be one or one or more above, and here no longer repeat.
Claims
1. An automatic transfer switch comprising: The drive element is used to drive the actuator to realize power conversion, the power output control circuit is used to control the power supply of the drive element, and the power selection circuit is used to select one power supply from the first to the Nth power supply as the input power of the power output control circuit, and N is an integer greater than or equal to 2; characterized in that the power selection circuit comprises a plurality of power selection circuits and the first to the Nth solid-state selection circuits connected with the first to the Nth power supplies one by one; the plurality of power selection circuits are composed of a relay K1 with N input contact pairs and an output contact pair, and the output contact pair of the relay K1 is connected with two power input terminals of the power output control circuit; the first to the Nth solid-state selection circuits are composed of two thyristor groups, each thyristor group is composed of two anti-parallel thyristors, one end of the two thyristor groups is connected with the L line and the N line of the power supply respectively, and the other end of the two thyristor groups is connected with the first to the Nth input contact pairs of the relay K1 respectively. i The solid-state selection circuit is composed of two thyristor groups, each thyristor group is composed of two anti-parallel thyristors, one end of the two thyristor groups is connected with the L line and the N line of the power supply respectively, and the other end of the two thyristor groups is connected with the first to the Nth input contact pairs of the relay K1 respectively. i The power supply has L line and N line, i The first to the Nth input contact pairs of the relay K1 are connected with the first to the Nth solid-state selection circuits respectively, i =1,2,…,N.
2. The automatic transfer switch of claim 1, wherein: The power output control circuit comprises a relay K2, a rectifier bridge B1, a pair of normally open contacts of the relay K2 are connected to a pair of output contacts of the relay K1, a pair of output contacts of the relay K2 are connected to AC input terminals of the rectifier bridge B1, and DC output terminals of the rectifier bridge B1 are connected to power input terminals of the driving element.
3. The automatic transfer switch of claim 1, wherein: The driving element is an electromagnet or a motor.