CN203289150U - Anti-thunder charger - Google Patents

Abstract

The utility model relates to a charger. The purpose of the charger is to provide a charger which has better anti-lightning ability, can effectively protect electronic components in the charger, and has the characteristics of simple structure and low cost. The technical solution is: a lightning protection charger, including a housing, a transformer installed in the housing, a circuit board and a heat dissipation mechanism, characterized in that: the charger is also provided with a surge protector, which is located between the transformer and between the power plugs.

Description

lightning protection charger

technical field

The utility model relates to a charger, in particular to a charger with a lightning protection function. the

Background technique

Existing battery chargers usually use power frequency transformers to convert 220V AC into low-voltage AC, and then charge DC through circuit board rectification and filtering. This type of charger is usually located outdoors. Because there are a large number of electronic devices in the charger, the ability to withstand lightning voltage is poor. In the thunderstorm season every year, chargers are damaged by lightning strikes, and the maintenance cost is high. A better one is needed. The solution is to greatly reduce the damage probability of the charger with a small investment. the

Utility model content

The purpose of this utility model is to overcome the deficiencies in the above-mentioned background technology and provide a charger with lightning protection function. The utility model has the characteristics of simple structure and low cost. the

The utility model can be realized through the following technical solutions:

The lightning protection charger includes a housing, a transformer installed in the housing, a circuit board, and a heat dissipation mechanism, and is characterized in that: the charger is also provided with a surge protector, which is located between the transformer and the power plug . the

The surge protector includes a single-phase balanced circuit composed of two zinc oxide varistors TMOV1, TMOV2 and a secondary gas discharge tube G1; the two zinc oxide varistors TMOV1, TMOV2 are connected in series and connected to the power plug Between the phase line L and the neutral line N, a differential mode protection circuit is formed; one pin of the secondary gas discharge tube G1 is connected to the midpoint between the two zinc oxide varistors TMOV1 and TMOV2, and the other pin The pin is connected to the ground wire PE of the power plug to form two sets of common mode protection circuits. the

In the two groups of common mode protection circuits, the zinc oxide varistor TMOV1 and the secondary gas discharge tube G1 are connected in series to form a group of common mode protection circuits, and the zinc oxide varistor TMOV2 and the secondary gas discharge tube G1 form another group common mode protection circuit. the

The beneficial effects of the utility model are: the utility model is provided with a surge protector at the front end of the transformer. When a large voltage and a large current are input under the influence of lightning, the surge protector can protect the electronic components in the charger and prevent them from damage, save maintenance costs, and the utility model has a simple structure, easy manufacture, low production cost, and has a good market prospect. the

Description of drawings

Fig. 1 is a front structural schematic view of the utility model. the

Fig. 2 is a circuit structure diagram of the surge protector in Fig. 1 . the

Detailed ways

Below in conjunction with accompanying drawing of description, the utility model is further described. the

As shown in Figure 1, the lightning protection charger includes a housing 1, a transformer 6 installed in the housing, a circuit board 2, a control button 7, a current indicator 8 and a heat dissipation mechanism 3, and the transformer is connected to the power supply from the power plug 5 The voltage is transformed and output from the output terminal 9 after being rectified by the circuit board to charge the storage battery. the

The charger described in the utility model is also provided with a surge protector 4, which is located between the transformer and the power plug. When a lightning strike voltage enters the charger, the surge protector can prevent the voltage from entering, thereby protecting The charger is not damaged. the

As shown in Figure 2, the surge protector is a surge protection circuit in the form of port parallel connection, which consists of two zinc oxide varistors TMOV1 and TMOV2 with built-in thermal fuses and a secondary gas discharge tube G1 single-phase balanced circuit. Two zinc oxide varistors TMOV1 and TMOV2 are connected in series and connected between the phase line L and the neutral line N of the power plug to form a differential mode protection circuit to ensure the residual voltage between the lines; one leg of the secondary gas discharge tube G1 Connected at the midpoint between the two zinc oxide varistors TMOV1 and TMOV2, and the other pin is connected to the ground wire PE of the power plug to form two sets of common mode protection circuits, in which the zinc oxide varistor TMOV1 is connected to the secondary gas The discharge tube G1 is connected in series to form a set of common-mode protection circuits, and the zinc oxide varistor TMOV2 and the secondary gas discharge tube G1 form another set of common-mode protection circuits. the

The working principle of the surge protector is: before the surge caused by lightning strikes, all the zinc oxide varistors and secondary gas discharge tubes connected in parallel on the line are in a high resistance state, which has no effect on the system work; There are two situations: one is between the lines (differential mode), that is, between the phase line L and the neutral N; the other is between the line and the ground (common mode), that is, between the phase line L, the neutral N, and the ground; When the impact occurs, the zinc oxide varistors TMOV1 and TMOV2 of the voltage limiting element are turned on instantly and are in a low-resistance state, so that the voltage at both ends of the outgoing line is guaranteed to be within the acceptable range of the protected equipment; The piezoresistor TMOV1 or TMOV2 is instantly connected to the diode gas discharge tube G1, so that the line-to-ground voltage is guaranteed to be within the acceptable range of the protected equipment. the

All the above-mentioned components can be obtained by outsourcing, and the surge protector can also be outsourced with mature models, which are determined according to actual needs. the

Claims (3)

1. lightning protection charger; comprise housing (1), be arranged on transformer (6), circuit board (2) and cooling mechanism (3) in housing; it is characterized in that: described charger also is provided with Surge Protector (4), and this Surge Protector is positioned between transformer and attaching plug (5).

2. lightning protection charger according to claim 1, it is characterized in that: described Surge Protector comprises by two Zinc-oxide piezoresistor TMOV1, TMOV2 and the monophase equilibrium circuit that secondary gas discharge tube G1 forms; Be attempted by between the phase line L and neutral line N of attaching plug after two Zinc-oxide piezoresistor TMOV1, TMOV2 series connection, form the differential mode protective circuit; The pin of secondary gas discharge tube G1 is connected to two point midways between Zinc-oxide piezoresistor TMOV1, TMOV2, and another pin is connected with the ground wire PE of attaching plug, forms two groups of common mode protective circuits.

3. lightning protection charger according to claim 2; it is characterized in that: in described two groups of common mode protective circuits; Zinc-oxide piezoresistor TMOV1 connects with secondary gas discharge tube G1 and forms one group of common mode protective circuit, and Zinc-oxide piezoresistor TMOV2 and secondary gas discharge tube G1 form another group common mode protective circuit.

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