Direct-current stabilized power supply protection circuit

Abstract

The utility model discloses a DC stabilized power supply protection circuit, which belongs to the technical field of protection circuits, not only has a voltage reduction function, but also realizes an overheating protection function by adopting a voltage reduction DC module, and realizes short-circuit protection by additionally designing an AC transformation module. And a current acquisition module is designed to acquire current changes and feed the current changes back to the voltage stabilization module to realize an efficient adjustment function.

Description

Technical Field

[0001] This utility model relates to a protection circuit, and more particularly to a DC regulated power supply protection circuit, belonging to the field of protection circuit technology. Background Technology

[0002] Existing DC regulated power supply protection circuits cannot provide rapid fuse protection against sudden high voltage and high current during AC transformation. In addition, the current acquisition design in existing technologies cannot efficiently cooperate with the voltage regulator module to achieve good internal circulation voltage regulation. Therefore, a DC regulated power supply protection circuit is designed to solve the above problems. Utility Model Content

[0003] The main purpose of this utility model is to provide a DC regulated power supply protection circuit. By using a step-down DC module, it not only has the function of stepping down the voltage but also realizes the function of overheat protection. In addition, an AC transformer module is designed to realize short circuit protection. Furthermore, a current acquisition module is designed to collect current changes and feed them back to the voltage regulator module to realize efficient regulation function.

[0004] The objective of this utility model can be achieved by adopting the following technical solution:

[0005] A DC regulated power supply protection circuit includes an AC transformer module;

[0006] The AC transformer module transmits low voltage to the step-down DC module through transformation, and then the step-down DC module transmits the step-down DC power to the voltage regulator module and the current acquisition module.

[0007] The current acquisition module acquires the stepped-down DC voltage from the step-down DC module and feeds it back to the voltage regulator module.

[0008] The voltage is regulated and then transmitted to the load after being adjusted by the voltage regulator module.

[0009] Preferably, the current acquisition module includes resistors R2 and R1 and thyristor Q1. The source of thyristor Q1 is electrically connected to one end of inductor L1, and the other end of inductor L1 is electrically connected to one end of resistor R2.

[0010] The source of thyristor Q1 is also electrically connected to one end of resistor R1 and the cathode of diode D1;

[0011] The other end of resistor R1 is electrically connected to the anode of polarized capacitor C2, and the cathode of polarized capacitor C2 is grounded.

[0012] The other end of resistor R2 is electrically connected to the anode of polarized capacitor C1, the cathode of polarized capacitor C1 is grounded, and the anode of diode D1 is grounded.

[0013] Preferably, the drain of thyristor Q1 is electrically connected to one end of the step-down DC module and the load.

[0014] Preferably, the voltage regulator module includes a voltage regulator chip P1, and the IN terminal of the voltage regulator chip P1 is electrically connected to one end of capacitor C5, one end of capacitor C6, and the output terminal of the step-down DC module.

[0015] The OUT terminal of the voltage regulator chip P1 is connected to one end of capacitor C4, one end of capacitor C3, and the other end of the load. The other ends of capacitors C3, C4, C5, and C6 are interconnected.

[0016] Preferably, the step-down DC module includes a rectifier bridge U1 and a normally closed thermal relay J1;

[0017] One input terminal of rectifier bridge U1 is electrically connected to one end of the normally closed contact J1 of thermal relay, and the other input terminal of rectifier bridge U1 is electrically connected to AC transformer module. The other end of the normally closed contact J1 of thermal relay is also connected to AC transformer module. One output terminal of rectifier bridge U1 is electrically connected to the drain of thyristor Q1, and the other output terminal of rectifier bridge U1 is electrically connected to one end of capacitor C6.

[0018] Preferably, the AC transformer module includes a transformer T1 and a fuse R3. One end of the fuse R3 is connected to a power supply and the other end is connected to an input terminal of the transformer T1. The other input terminal of the transformer T1 is connected to an external power supply. One output terminal of the transformer T1 is connected to one end of a thermal relay J1, and the other output terminal of the transformer T1 is connected to the other input terminal of a rectifier bridge U1.

[0019] The beneficial technical effects of this utility model are as follows:

[0020] This utility model provides a DC regulated power supply protection circuit. By using a step-down DC module, it not only has the function of stepping down but also realizes the function of overheat protection. In addition, an AC transformer module is designed to realize short circuit protection. Furthermore, a current acquisition module is designed to collect current changes and feed them back to the voltage regulator module to realize efficient regulation function. Attached Figure Description

[0021] Figure 1 This is a circuit diagram of a preferred embodiment of a DC regulated power supply protection circuit according to the present invention.

[0022] In the diagram: 1-current acquisition module, 2-voltage stabilization module, 3-step-down DC module, 4-AC transformer module. Detailed Implementation

[0023] To enable those skilled in the art to understand the technical solution of this utility model more clearly, the present utility model will be further described in detail below with reference to the embodiments and accompanying drawings, but the implementation of this utility model is not limited thereto.

[0024] like Figure 1 As shown, this embodiment provides a DC regulated power supply protection circuit, including an AC transformer module 4;

[0025] The AC transformer module 4 transmits low voltage to the step-down DC module 3 through the transformer, and then transmits the step-down DC power to the voltage regulator module 2 and the current acquisition module 1 through the step-down DC module 3.

[0026] The current acquisition module 1 acquires the stepped-down DC voltage from the step-down DC module 3 and feeds it back to the voltage regulator module 2;

[0027] The voltage is regulated and then transmitted to the load via voltage regulator module 2.

[0028] In this embodiment, the current acquisition module 1 includes resistors R2 and R1 and thyristor Q1. The source of thyristor Q1 is electrically connected to one end of inductor L1, and the other end of inductor L1 is electrically connected to one end of resistor R2.

[0029] The source of thyristor Q1 is also electrically connected to one end of resistor R1 and the cathode of diode D1;

[0030] The other end of resistor R1 is electrically connected to the anode of polarized capacitor C2, and the cathode of polarized capacitor C2 is grounded.

[0031] The other end of resistor R2 is electrically connected to the anode of polarized capacitor C1, the cathode of polarized capacitor C1 is grounded, and the anode of diode D1 is grounded.

[0032] Local working principle: The current enters the thyristor Q1 through the rectifier bridge U1, is filtered by the inductor L1, is divided by the resistors R2 and R1, and is then rectified by the polarized capacitors C2 and C1.

[0033] In this embodiment, the drain of thyristor Q1 is electrically connected to one end of the step-down DC module 3 and the load.

[0034] In this embodiment, the voltage regulator module 2 includes a voltage regulator chip P1, and the IN terminal of the voltage regulator chip P1 is electrically connected to one end of capacitor C5, one end of capacitor C6, and the output terminal of the step-down DC module 3.

[0035] The OUT terminal of the voltage regulator chip P1 is connected to one end of capacitor C4, one end of capacitor C3, and the other end of the load. The other ends of capacitors C3, C4, C5, and C6 are interconnected.

[0036] The voltage is regulated by using a voltage regulator chip P1, and the current is rectified by using capacitors C3 to C6.

[0037] In this embodiment, the step-down DC module 3 includes a rectifier bridge U1 and a normally closed thermal relay J1;

[0038] One input terminal of rectifier bridge U1 is electrically connected to one end of the normally closed contact J1 of thermal relay, and the other input terminal of rectifier bridge U1 is electrically connected to AC transformer module 4. The other end of the normally closed contact J1 of thermal relay is also connected to AC transformer module 4. One output terminal of rectifier bridge U1 is electrically connected to the drain of thyristor Q1, and the other output terminal of rectifier bridge U1 is electrically connected to one end of capacitor C6.

[0039] In this embodiment, the AC transformer module 4 includes a transformer T1 and a fuse R3. One end of the fuse R3 is connected to a power supply and the other end is connected to an input terminal of the transformer T1. The other input terminal of the transformer T1 is connected to an external power supply. One output terminal of the transformer T1 is connected to one end of a thermal relay J1, and the other output terminal of the transformer T1 is connected to the other input terminal of a rectifier bridge U1.

[0040] A thermal relay J1 is used to achieve the function of disconnecting at high temperatures, and a fuse R3 is used to avoid the problem of short circuits failing to blow.

[0041] The above description is only a further embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the scope disclosed by the present utility model, based on the technical solution and concept of the present utility model, shall fall within the protection scope of the present utility model.

Claims

1. A DC regulated power supply protection circuit, characterized in that: Including AC transformer module (4); The AC transformer module (4) transmits low voltage to the step-down DC module (3) through the transformer, and then transmits the step-down DC power to the voltage regulator module (2) and the current acquisition module (1) through the step-down DC module (3). The current acquisition module (1) acquires the DC step-down module (3) and feeds it back to the voltage regulator module (2); After being regulated by the voltage regulator module (2), the voltage is transmitted to the load.

2. The DC regulated power supply protection circuit according to claim 1, characterized in that: The current acquisition module (1) includes resistors R2 and R1 and thyristor Q1. The source of thyristor Q1 is electrically connected to one end of inductor L1, and the other end of inductor L1 is electrically connected to one end of resistor R2. The source of thyristor Q1 is also electrically connected to one end of resistor R1 and the cathode of diode D1; The other end of resistor R1 is electrically connected to the anode of polarized capacitor C2, and the cathode of polarized capacitor C2 is grounded. The other end of resistor R2 is electrically connected to the anode of polarized capacitor C1, the cathode of polarized capacitor C1 is grounded, and the anode of diode D1 is grounded.

3. The DC regulated power supply protection circuit according to claim 2, characterized in that: The drain of thyristor Q1 is electrically connected to one end of the step-down DC module (3) and the load.

4. The DC regulated power supply protection circuit according to claim 3, characterized in that: The voltage regulator module (2) includes a voltage regulator chip P1. The IN terminal of the voltage regulator chip P1 is electrically connected to one end of capacitor C5, one end of capacitor C6, and the output terminal of the step-down DC module (3). The OUT terminal of the voltage regulator chip P1 is connected to one end of capacitor C4, one end of capacitor C3, and the other end of the load. The other ends of capacitors C3, C4, C5, and C6 are connected to each other.

5. A DC regulated power supply protection circuit according to claim 4, characterized in that: The step-down DC module (3) includes a rectifier bridge U1 and a normally closed thermal relay J1; One input terminal of rectifier bridge U1 is electrically connected to one end of the normally closed contact J1 of thermal relay, and the other input terminal of rectifier bridge U1 is electrically connected to AC transformer module (4). The other end of the normally closed contact J1 of thermal relay is also connected to AC transformer module (4). One output terminal of rectifier bridge U1 is electrically connected to the drain of thyristor Q1, and the other output terminal of rectifier bridge U1 is electrically connected to one end of capacitor C6.

6. The DC regulated power supply protection circuit according to claim 5, characterized in that: The AC transformer module (4) includes a transformer T1 and a fuse R3. One end of the fuse R3 is connected to the power supply and the other end is connected to one input terminal of the transformer T1. The other input terminal of the transformer T1 is connected to an external power supply. One output terminal of the transformer T1 is connected to one end of the thermal relay J1, and the other output terminal of the transformer T1 is connected to the other input terminal of the rectifier bridge U1.

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