Power supply switching control circuit

Abstract

The utility model discloses a power supply switching control circuit, which comprises a power supply, a power taking circuit, a switching circuit, a load 1, a load 2, a line A, a line B and a line C, the corresponding end of the power supply is electrically connected with the corresponding ends of the load 1, the line A, the load 2 and the line B respectively, and the corresponding end of the load 2 is also electrically connected with the corresponding ends of the line C and the load 1 respectively; the corresponding end of the electricity taking circuit is connected with the B line and the C line; the corresponding ends of the switching circuit are electrically connected with the A line, the B line and the C line correspondingly. The power supply switching control circuit can switch power supply between two loads, ensures that the power supply can be flexibly distributed to different loads under different working conditions, can maintain stable power supply of the loads in the power supply switching process, and reduces the phenomena of voltage fluctuation and power failure.

Description

TECHNICAL FIELD

[0001] The utility model relates to power supply switching technical field, especially relates to a power supply switching control circuit. BACKGROUND

[0002] In modern electronic systems, it is often necessary to provide power to two or more critical devices from an external power supply. This requirement is particularly common in the fields of servers, telecommunications equipment, medical devices, industrial control systems, etc. However, existing power supply switching control systems have some significant problems and limitations, especially in terms of power supply capability.

[0003] Single power supply limitation: existing design solutions usually cannot simultaneously provide stable power to two critical devices in the system from an external power supply. This limitation may result in performance degradation or failure of the system when multiple devices need to be powered.

[0004] High voltage range requirement: many existing circuits have high requirements for the voltage range of the power supply, which limits their application in different power supply environments, especially in situations with large voltage fluctuations.

[0005] Small power supply current: existing circuits have limitations in terms of power supply current, which may not meet the needs of high-power loads, especially when multiple loads need to be powered simultaneously.

[0006] Complex circuit, large circuit loss: traditional power switching circuit design is complex, involving multiple components, which not only increases the manufacturing cost of the circuit, but also may result in higher circuit loss, affecting the overall energy efficiency. SUMMARY

[0007] In view of the problems existing in the prior art, the utility model provides a power supply switching control circuit.

[0008] In order to achieve the above purpose, the utility model technical scheme is as follows:

[0009] The utility model provides a power supply switching control circuit, comprising: a power supply, a power taking circuit, a switching circuit, a load 1, a load 2, an A line, a B line, a C line;

[0010] The power supply corresponds to the load 1, the A line, the load 2, the B line, and the load 2 corresponds to the C line and the load 1, and they are electrically connected;

[0011] The power taking circuit corresponds to the B line and the C line;

[0012] The switching circuit corresponds to the A line, the B line and the C line, and they are electrically connected.

[0013] Preferably, the power supply includes an AC power supply, a DC power supply.

[0014] Preferably, the power supply circuit includes a rectifier bridge VD1, a diode ESD1, a resistor R3, a capacitor C2, a resistor R2, a diode TVS1, a voltage stabilizing chip U1, a diode D1, a capacitor C3.

[0015] The first pin of the rectifier bridge VD1 is electrically connected with the B line, and the second pin of the rectifier bridge VD1 is electrically connected with the C line. The third pin of the rectifier bridge VD1 is electrically connected with the first end of the diode ESD1, the first end of the resistor R3, the first end of the capacitor C2, the first end of the resistor R2, the first end of the diode TVS1, and the second pin of the voltage stabilizing chip U1. The fourth pin of the rectifier bridge VD1 is electrically connected with the second end of the resistor R3, the second end of the capacitor C2, the second end of the resistor R2, the second end of the diode TVS1, the first pin of the voltage stabilizing chip U1, and the first end of the capacitor C3. The third pin of the voltage stabilizing chip U1 is electrically connected with the second end of the capacitor C3 through the diode D1.

[0016] Preferably, the model of the voltage stabilizing chip U1 is CJ8850, which is used to stabilize the voltage input by the power supply to 5V DC power supply for the switching circuit.

[0017] Preferably, the switching circuit includes a capacitor C1, a diode D2, a relay J1, a resistor R1, and a fuse F1.

[0018] The first pin of the relay J1 is electrically connected with the first end of the diode D2, the first end of the capacitor C1, and the 5V DC power supply end. The fourth pin of the relay J1 is electrically connected with the second end of the diode D2 and the second end of the capacitor C1, and is grounded. The second pin of the relay J1 is electrically connected with the test point TP2 and the first end of the resistor R1. The second end of the resistor R1 is electrically connected with the test point TP1. The third pin of the relay J1 is electrically connected with the test point TP3 through the fuse F1.

[0019] Preferably, the test point TP1 is electrically connected with the B line, the test point TP2 is electrically connected with the C line, and the test point TP3 is electrically connected with the A line.

[0020] The technical scheme of the power supply switching control circuit has the following beneficial effects:

[0021] The power supply switching control circuit can switch the power supply between two loads (load 1 and load 2), ensuring that the power supply can be flexibly distributed to different loads under different working conditions, and maintaining stable power supply for the loads during the power supply switching process, thereby reducing voltage fluctuation and power failure.

[0022] The circuit design of the utility model allows the power supply to be an alternating current (AC) or a direct current (DC) power supply, enhancing the versatility and applicability of the circuit, allowing it to adapt to different power supply environments.

[0023] The utility model discloses a voltage stabilizing chip U1 in the power taking circuit, and the circuit can stabilize the input power supply voltage to 5V direct current power supply, providing stable power supply for the switching circuit, thereby ensuring the reliability of the circuit and the stable operation of the load.

[0024] The diode TVS1 in the power taking circuit provides overvoltage protection function, and when the power supply voltage exceeds the predetermined value, TVS1 can respond quickly to protect the circuit from voltage spikes.

[0025] The fuse F1 in the switching circuit of the utility model provides short-circuit protection, and when abnormal current appears in the circuit, the fuse can be fused in time to prevent the circuit from being damaged due to overcurrent.

[0026] The circuit design of the utility model is simple, and the automatic or manual switching of the power supply is realized through the relay J1, simplifying the complexity of power management and reducing the maintenance cost of the circuit.

[0027] The setting of the test points TP1, TP2 and TP3 of the utility model is convenient for monitoring the voltage or current in the circuit, facilitating fault diagnosis and performance evaluation, and improving the maintainability of the circuit.

[0028] The circuit design of the utility model adopts common electronic components such as diodes, capacitors, resistors and relays, and these components have low cost, so that the entire circuit has high cost efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0029] Fig. 1 It is the control block diagram of the utility model;

[0030] Fig. 2 It is the connection schematic diagram of the switching circuit, the power supply, the load 1 and the load 2 of the utility model;

[0031] Fig. 3 It is the principle diagram of the power taking circuit of the utility model;

[0032] Fig. 4 It is the principle diagram of the switching circuit of the utility model. DETAILED DESCRIPTION

[0033] The embodiments of the present application are described below in detail, examples of which are shown in the drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by reference to the drawings are exemplary, and are intended to explain the present application, and cannot be understood as a limitation of the present application.

[0034] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0035] In addition, the terms "first" and "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0036] In the present application, unless otherwise specifically defined and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0037] In the present application, unless otherwise specifically defined and limited, the first feature is "on" or "above" the second feature

[0038] The "below" can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature "above", "above" and "above" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0039] Referring to Figs. 1 to 4 The utility model provides a power supply switching control circuit, including: power supply 100, take electricity circuit 200, switching circuit 300, load 1, load 2, A line, B line, C line,

[0040] The power supply 100 corresponding end is electrically connected with load 1, A line, load 2, B line corresponding end respectively, and the load 2 corresponding end is electrically connected with C line and load 1 corresponding end respectively,

[0041] The take electricity circuit 200 corresponding end is connected with B line and C line,

[0042] The switching circuit 300 corresponding end is electrically connected with A line, B line, C line respectively.

[0043] Wherein power supply 100, for the whole circuit provides necessary electric energy, it can be alternating current (AC) or direct current (DC) power supply, provides power for load 1 and load 2;Take electricity circuit: obtains electric energy from power supply and converts it into voltage and current suitable for internal use of circuit. It includes rectification, filtering, voltage regulation and protection etc. link, ensure that the circuit stable operation;Switching circuit: control power supply between load 1 and load 2 switching;Through the on-off of relay J1, realizes the automatic or manual switching of power supply, to meet the power supply demand of different loads;Load 1 and load 2: the final electric equipment or system of circuit, they can be any need power equipment, such as electronic equipment, lighting system or other mechanical device.

[0044] Further, the take electricity circuit 200 includes rectifier bridge VD1, diode ESD1, resistance R3, capacitor C2, resistance R2, diode TVS1, voltage stabilizing chip U1, diode D1, capacitor C3,

[0045] The first pin of the rectifier bridge VD1 is electrically connected with the B line, and the second pin of the rectifier bridge VD1 is electrically connected with the C line; the third pin of the rectifier bridge VD1 is electrically connected with the first end of the diode ESD1, the first end of the resistor R3, the first end of the capacitor C2, the first end of the resistor R2, the first end of the diode TVS1, and the second pin of the voltage stabilizing chip U1, and the fourth pin of the rectifier bridge VD1 is electrically connected with the second end of the resistor R3, the second end of the capacitor C2, the second end of the resistor R2, the second end of the diode TVS1, the first pin of the voltage stabilizing chip U1, and the first end of the capacitor C3; the third pin of the voltage stabilizing chip U1 is electrically connected with the second end of the capacitor C3 through the diode D1; the model of the voltage stabilizing chip U1 is CJ8850, which is used to stabilize the voltage of the power supply input to 5V direct current power supply for the switching circuit; wherein the rectifier bridge VD1 is used to convert alternating current power supply into direct current power supply, the resistor R3 is used to limit current or as a voltage divider to provide appropriate voltage for the subsequent circuit. The capacitor C2 is used for filtering, smoothing the rectified direct current, reducing power supply noise and fluctuation, and providing more stable power supply; the resistor R2 is used to further limit current to ensure that the current in the circuit is within a safe range; the voltage stabilizing chip U1 stabilizes the rectified and filtered direct current voltage to a constant value, such as 5V, to provide stable power supply for the switching circuit and ensure that the load 1 and the load 2 obtain stable power supply. The diode D1 prevents reverse current flow to protect the voltage stabilizing chip U1, ensures that current can only flow from the voltage stabilizing chip to the capacitor C3, and prevents current from flowing in reverse when the capacitor is discharging; the capacitor C3 is used for further filtering and stabilizing power supply, stores energy to cope with load changes, and provides smoother direct current power supply.

[0046] Further, the switching circuit 300 includes a capacitor C1, a diode D2, a relay J1, a resistor R1, a fuse F1; the first pin of the relay J1 is electrically connected with the first end of the diode D2, the first end of the capacitor C1 and the 5V DC power supply end respectively, the fourth pin of the relay J1 is electrically connected with the second end of the diode D2 and the second end of the capacitor C1 and grounded respectively, the second pin of the relay J1 is electrically connected with the test point TP2 and the first end of the resistor R1 respectively, and the second end of the resistor R1 is electrically connected with the test point TP1; the third pin of the relay J1 is electrically connected with the test point TP3 through the fuse F1; the test point TP1 is connected with the B line, the test point TP2 is connected with the C line, and the test point TP3 is connected with the A line. In the embodiment, the switching circuit 300: is responsible for controlling the switching of the power supply 100 between the load 1 and the load 2, and the automatic or manual switching of the power supply is realized by the on-off of the relay J1. The capacitor C1: is used for decoupling, smoothing the current of the relay J1 coil, reducing the voltage peak, and protecting the circuit. The diode D2: is used for reverse electromotive force protection of the relay coil, and when the relay coil is powered off, it provides a path for the current in the coil to circulate, preventing reverse current from damaging other components. The relay J1: is used as the core component of the switching circuit, and the flow direction of the power supply is controlled by the on-off of the contact of the relay J1; the resistor R1: is used for limiting the current flowing through the test point TP1, protecting the test equipment or as a current detection resistor; the fuse F1: provides overcurrent protection, and when the current exceeds the safe value, the fuse will melt, preventing the circuit from being damaged; the test points TP1, TP2 and TP3: are used for monitoring the voltage or current in the circuit, facilitating debugging and maintenance.

[0047] The working principle of the utility model is as follows:

[0048] When the power supply 100 supplies power, because the resistance of the load 1 and the load 2 is far less than the resistance of the resistor R1 (for example, 100KΩ)

[0049] At this time, the voltage across the power supply is concentrated on the B and C ends. The voltage across the B and C ends is converted by the power taking circuit 200 and then converted into 5V DC power by the LDO to the coil control end of the relay J1. Because the coil of the relay J1 has current passing through, the 2 and 3 pins of the relay J1 will be turned on. When the 2 and 3 pins of the relay J1 are turned on, the external power supply 100 will bypass the load 1 and directly supply power to the load 2. In this state, the external power supply 100 will completely supply power to the load 2.

[0050] When the switch of the load 2 is pressed, the load 2 will short the power supply between the two ends of the resistor R1, that is, between B and C. At this time, the power taking circuit 200 will not be able to take power, and the power taking circuit 200 will be quickly powered off through the resistor R3 inside the power taking circuit 200, so as to ensure that the power taking circuit 200 is powered off quickly. After the power taking circuit 200 is powered off, the coil of the relay J1 will not have electricity passing through, and the 2 and 3 of the relay J1 will be disconnected, so that A and C will not be conducted. The external power supply 100 directly loads the two ends of the load 1 through the short circuit of the load 2. In this state, the external power supply 100 will completely supply power to the load 1.

[0051] Before the external power supply 100 supplies power to the load 1, the external power supply 100 forms a loop through the load 2 short circuit, the 2 and 3 pins (A to C) of the relay J1, and F1. The fuse F1 protects the power supply in this state.

[0052] The circuit selection in the design scheme can be adjusted according to actual needs. The power supply 100 can be an AC power supply or a DC power supply. The protection design can be selected according to the actual power supply. If the load 1 needs to be powered for a long time, the on time of the load 2 can be set, which is convenient and applicable.

[0053] The above only describes the preferred embodiments of the utility model, and does not limit the patent range of the utility model. Any equivalent structural transformation, direct / indirect application in other related technical fields under the utility model concept of the utility model, and the contents of the utility model specification and the drawings are included in the patent protection range of the utility model.

Claims

1. A power supply switching control circuit, characterized by comprising: The utility model relates to a power supply, power taking circuit, switching circuit, load 1, load 2, A line, B line, C line, and it comprises: The power supply is electrically connected with the load 1, A line, load 2 and B line respectively, and the load 2 is also electrically connected with the C line and load 1 respectively; The power taking circuit is connected with the B line and C line; The switching circuit is electrically connected with the A line, B line and C line; The power taking circuit comprises a rectifier bridge VD1, diode ESD1, resistor R3, capacitor C2, resistor R2, diode TVS1, voltage stabilizing chip U1, diode D1 and capacitor C3; The first pin of the rectifier bridge VD1 is electrically connected with the B line, and the second pin of the rectifier bridge VD1 is electrically connected with the C line; the third pin of the rectifier bridge VD1 is electrically connected with the first end of the diode ESD1, first end of the resistor R3, first end of the capacitor C2, first end of the resistor R2, first end of the diode TVS1 and second pin of the voltage stabilizing chip U1, and the fourth pin of the rectifier bridge VD1 is electrically connected with the second end of the resistor R3, second end of the capacitor C2, second end of the resistor R2, second end of the diode TVS1, first end of the capacitor C3 and first pin of the voltage stabilizing chip U1; the third pin of the voltage stabilizing chip U1 is electrically connected with the second end of the capacitor C3 through the diode D1; The switching circuit comprises a capacitor C1, diode D2, relay J1, resistor R1 and fuse F1; The first pin of the relay J1 is electrically connected with the first end of the diode D2, first end of the capacitor C1 and 5V DC power supply, the fourth pin of the relay J1 is electrically connected with the second end of the diode D2 and second end of the capacitor C1 and grounded, the second pin of the relay J1 is electrically connected with the test point TP2 and first end of the resistor R1, the second end of the resistor R1 is electrically connected with the test point TP1, and the third pin of the relay J1 is electrically connected with the test point TP3 through the fuse F1. The power supply comprises an AC power supply and a DC power supply.

2. The power supply switching control circuit of claim 1, wherein, The voltage stabilizing chip U1 is CJ8850, which is used for stabilizing the voltage of the power supply to 5V DC power supply for the switching circuit.

3. The power supply switching control circuit of claim 1, wherein The test point TP1 is connected with the B line, the test point TP2 is connected with the C line, and the test point TP3 is connected with the A line.

4. The power supply switching control circuit of claim 1, wherein, ​

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