Anti-impact starting circuit

Abstract

The utility model discloses an anti-impact starting circuit, which comprises an alternating current power supply, a surge buffer module, a shunt module and an output module, and is characterized in that the surge buffer module at least comprises an NTC (Negative Temperature Coefficient) resistor, the NTC resistor is electrically connected with the alternating current power supply, and the surge buffer module is also provided with an output end; the shunt module comprises a divider resistor, a first capacitor, a switching tube and a relay which are electrically connected in sequence, the divider resistor is electrically connected to the surge buffer module, the first capacitor is connected to the divider resistor in parallel, and when the voltage of the first capacitor reaches the starting voltage of the switching tube, the switching tube is opened to conduct the relay, so that the current provided by the alternating current power supply is shunted to the shunt module; the output module is electrically connected to the output end. According to the technical scheme of the utility model, the circuit can be prevented from being impacted by surge, and a better protection effect can be achieved under the condition of continuous startup and shutdown.

Description

Technical Field

[0001] The utility model relates to the technical field of electronic circuits, in particular to an anti-shock starting circuit. Background Art

[0002] Most conventional circuits on the market are directly connected to the power grid. Since alternating current (AC) is a sinusoidal wave, if the current is near the peak of the wave when the plug is inserted, the instantaneous current is very high, which can easily cause a surge, sparking, disrupting the power grid, shortening the life of the equipment, or even damaging it. Some circuits also use NTC resistors (negative temperature coefficient thermistors) in series to prevent surges. While this prevents surges, it increases current loss, reduces power efficiency, and can cause severe heat generation. Furthermore, if the NTC resistor is heated, continuous power on and off will not provide effective protection. Utility Model Content

[0003] The main purpose of the utility model is to provide an anti-shock starting circuit, which is intended to prevent the circuit from being subjected to surge shock and also provide better protection in the case of continuous switching.

[0004] To achieve the above-mentioned purpose, the present invention proposes an anti-shock starting circuit, comprising:

[0005] AC power supply;

[0006] A surge buffer module, comprising at least one NTC resistor, wherein the NTC resistor is electrically connected to the AC power supply, and the surge buffer module further comprises an output terminal;

[0007] A shunt module includes a voltage-dividing resistor, a first capacitor, a switch tube, and a relay electrically connected in sequence, wherein the voltage-dividing resistor is electrically connected to the surge buffer module, and the first capacitor is connected in parallel to the voltage-dividing resistor. When the voltage of the first capacitor reaches the turn-on voltage of the switch tube, the switch tube turns on to turn on the contact switch of the relay, thereby shunting the current provided by the AC power supply to the shunt module;

[0008] The output module is electrically connected to the output end.

[0009] In one embodiment of the present invention, the shunt module further includes a rectifier diode and a second capacitor, and the two are connected in parallel to the relay for rectifying the AC current into a DC current.

[0010] In an embodiment of the present invention, the voltage-dividing resistor includes a first resistor and a second resistor connected in parallel, and the first capacitor is connected in parallel to the second resistor.

[0011] In an embodiment of the present invention, the surge buffer module further includes a fuse, and the fuse is electrically connected between the AC power supply and the NTC resistor.

[0012] In an embodiment of the present invention, the output module is provided with a transformer, the transformer is electrically connected to the output end, and the output module further has a DC output port.

[0013] This utility model's technical solution incorporates a surge buffer module and a shunt module with an NTC resistor in the circuit. The current first flows through the NTC resistor to limit current and prevent surges. The shunt module's switch then drives the relay to open, creating another current path. Due to the current impedance shunt characteristic, the NTC resistor is now in an impedance state, allowing almost all current to flow through the other current path. The current flowing through the NTC resistor is extremely low, eliminating heat and reducing current loss. Furthermore, this process repeats itself during repeated power on and off, providing excellent protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0015] Figure 1 This is a circuit diagram of the anti-shock starting circuit of the utility model.

[0016] Description of Figure Numbers:

[0017] 1. Surge buffer module; 2. Shunt module; 3. Output module; 4. Output terminal; AC_IN, AC power supply; NTC1, NTC resistor; FUSE1, fuse; R1, first resistor; R2, second resistor; C4, first capacitor; Q1, switch tube; K1, relay; D3, rectifier diode; C3, second capacitor; T2, transformer; DC_OUT, DC output port.

[0018] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solutions and advantages of this application more clearly understood, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0020] Reference Figure 1 The present invention provides an anti-shock starting circuit, including an AC power supply AC_IN, a surge buffer module 1, a shunt module 2, and an output module 3. The surge buffer module 1 includes at least one NTC resistor NTC1, which is electrically connected to the AC power supply AC_IN. The surge buffer module 1 also has an output terminal 4. The shunt module 2 includes a voltage-dividing resistor, a first capacitor C4, a switch tube Q1, and a relay K1, which are electrically connected in sequence. The voltage-dividing resistor is electrically connected to the surge buffer module 1. The first capacitor C4 is connected in parallel to the voltage-dividing resistor. When the voltage of the first capacitor C4 reaches the turn-on voltage of the switch tube Q1, the switch tube Q1 turns on, causing the contact switch of the relay K1 to conduct, thereby shunting the current provided by the AC power supply AC_IN to the shunt module 2. The output module 3 is electrically connected to the output terminal 4.

[0021] As can be understood, the input current of the AC power supply AC_IN is first limited by the NTC resistor NTC1 of the surge buffer module 1 to prevent surge impact. Then, the voltage divider resistor divides the voltage to charge the first capacitor C4. Since the first capacitor C4 is connected to the switch tube Q1, when the first capacitor C4 is charged to the turn-on voltage of the switch tube Q1, the switch tube Q1 drives the relay K1 to open, forming another current path. Due to the current impedance shunt characteristic, the NTC resistor NTC1 is now in an impedance state, and the current flows almost entirely through the other current path. The current on the NTC resistor NTC1 is extremely small, thus preventing heat generation and reducing current loss. In addition, when the power is repeatedly turned on and off, the above process is repeated, which can achieve a good protection effect.

[0022] Reference Figure 1 In one embodiment of the present application, the shunt module 2 further includes a rectifier diode D3 and a second capacitor C3, and the two are connected in parallel to the relay K1 for rectifying the AC current into a DC current.

[0023] As you can understand, rectifier diode D3 is provided to rectify AC current into DC current to adapt to the operating voltage of different electrical appliances. The continuity of DC current makes electronic devices more suitable for logical judgment, while the volatility of AC current is detrimental to the normal operation of electronic components. Rectifier diode D3 uses its unidirectional conductivity to rectify AC current into DC output, while second capacitor C3 is a filter capacitor that filters out the AC component in the current, making the DC output smoother.

[0024] Reference Figure 1 In one embodiment of the present application, the voltage divider resistor includes a first resistor R1 and a second resistor R2 connected in parallel, and the first capacitor C4 is connected in parallel to the second resistor R2.

[0025] It can be understood that by dividing the voltage by the first resistor R1 and the second resistor R2 in parallel, a stable reference voltage can be accurately set to charge the first capacitor C4 by adjusting the resistance values ​​of the two resistors. In this example, the first resistor R1 is 100k ohms, the second resistor R2 is 1k ohm, and the first capacitor C4 is connected in parallel with the second resistor R2. The resistance values ​​of the two resistors can be selected according to the operating parameters of the first capacitor C4 to achieve the best voltage division and charging effects.

[0026] Reference Figure 1 In one embodiment of the present application, the surge buffer module 1 further includes a fuse FUSE1 , which is electrically connected between the AC power source AC_IN and the NTC resistor NTC1 .

[0027] It is understandable that the main function of setting fuse FUSE1 is to protect circuits and components from damage caused by overload current. When the current in the circuit exceeds the rated value of fuse FUSE1, the metal wire in fuse FUSE1 will melt, thereby cutting off the circuit and preventing further damage or fire.

[0028] Reference Figure 1 In one embodiment of the present application, the output module 3 is provided with a transformer T2, the transformer T2 is electrically connected to the output terminal 4, and the output module 3 also has a DC output port DC_OUT.

[0029] It can be understood that the transformer T2 is provided to adapt to the operating voltage of different electrical appliances. Since different electrical appliances have different operating parameters, the transformer T2 can convert the voltage into a suitable size and then output it from the DC output port DC_OUT to enable the electrical appliances to achieve the best working state.

[0030] This utility model's technical solution incorporates a surge buffer module 1 and a shunt module 2, each with an NTC resistor NTC1, in a circuit. Current first flows through the NTC resistor NTC1 to limit current and prevent surges. Subsequently, the switch Q1 in the shunt module 2 drives the relay K1 to open, creating another current path. Due to the current impedance shunt characteristic, the NTC resistor NTC1 is now in an impedance state, and almost all the current flows through the other current path. The current flowing through the NTC resistor NTC1 is extremely low, thus preventing heat generation and reducing current loss. Furthermore, this process repeats itself during repeated power on and off, providing excellent protection.

[0031] The same or similar numbers in the drawings of this embodiment correspond to the same or similar parts; in the description of this application, it should be understood that if the terms "upper", "lower", "left", "right", etc. indicate an orientation or position relationship, they are based on the orientation or position relationship shown in the drawings. This is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the terms describing the position relationship in the drawings are only used for illustrative purposes and cannot be understood as a limitation on this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0032] The above are only preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present application should be included in the scope of protection of the present application.

Claims

1. An anti-shock starting circuit, characterized in that: include: AC power supply; A surge buffer module, comprising at least one NTC resistor, wherein the NTC resistor is electrically connected to the AC power supply, and the surge buffer module further comprises an output terminal; A shunt module includes a voltage-dividing resistor, a first capacitor, a switch tube, and a relay electrically connected in sequence, wherein the voltage-dividing resistor is electrically connected to the surge buffer module, and the first capacitor is connected in parallel to the voltage-dividing resistor. When the voltage of the first capacitor reaches the turn-on voltage of the switch tube, the switch tube turns on to turn on the contact switch of the relay, thereby shunting the current provided by the AC power supply to the shunt module; The output module is electrically connected to the output end.

2. The anti-shock starting circuit according to claim 1, characterized in that: The shunt module further includes a rectifier diode and a second capacitor, which are connected in parallel to the relay and are used to rectify the AC current into a DC current.

3. The anti-shock starting circuit according to claim 2, characterized in that: The voltage-dividing resistor includes a first resistor and a second resistor connected in parallel, and the first capacitor is connected in parallel to the second resistor.

4. The anti-shock starting circuit according to claim 1, characterized in that: The surge buffer module further includes a fuse electrically connected between the AC power supply and the NTC resistor.

5. The anti-shock starting circuit according to any one of claims 1 to 4, characterized in that: The output module is provided with a transformer, the transformer is electrically connected to the output end, and the output module also has a DC output port.

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