CN203278228U

CN203278228U - Charger with alarm function of power supply reversal connection

Info

Publication number: CN203278228U
Application number: CN 201320338118
Authority: CN
Inventors: 任佳
Original assignee: Chengdu Ruiyi Information Technology Co Ltd
Current assignee: Chengdu Ruiyi Information Technology Co Ltd
Priority date: 2013-06-14
Filing date: 2013-06-14
Publication date: 2013-11-06
Anticipated expiration: 2023-06-14

Abstract

The utility model discloses a charger with an alarm function of power supply reversal connection. The charger comprises a protection circuit. The protection circuit is arranged between a grounding port and an internal circuit and comprises a resistor R1, a comparator M and a field effect transistor Q. A source electrode of the field effect transistor Q is connected with the grounding port; a drain electrode is connected with the internal circuit; one end of the resistor R1 is connected with the drain electrode of the field effect transistor Q and another end of the resistor R1 is grounded; two inputs of the comparator M are respectively connected with two terminals of the resistor R1; and an output of the comparator M is connected with a grid of the field effect transistor Q. The beneficial effects of the utility model are that: the protection circuit starts when the charger grounding port is connected with the power supply; and the connection between the grounding port and the internal circuit is cut off so that the charger is protected.

Description

Charger with reverse power connection warning function

Technical field

The utility model relates to a kind of protective circuit, particularly relates to a kind of charger with reverse power connection warning function.

Background technology

A lot of chargers all are provided with charging port and grounding ports; during charging; charging port connects power supply; grounding ports ground connection; can carry out quick charge to electric; but when grounding ports connects power supply; the charger internal circuit causes counter-rotating; can destroy the circuit in charger; so the grounding ports place of existing charger all can arrange protective circuit, but existing protective circuit is only protection protection charger, places charger and is destroyed; the user does not still know the port mistake, causes charging unsuccessful.

The utility model content

The purpose of this utility model is to overcome the shortcoming and defect of above-mentioned prior art, a kind of charger with reverse power connection warning function is provided, after overcoming existing charger grounding ports connection power supply, the user does not know mistake, thereby causes charging unsuccessful defective.

the purpose of this utility model is achieved through the following technical solutions: the charger with reverse power connection warning function, comprise a protective circuit, protective circuit is arranged between grounding ports and internal circuit, it comprises resistance R 1, comparator M and field effect transistor Q1, the source electrode of field effect transistor Q1 connects grounding ports, drain electrode connects internal circuit, resistance R 1 one ends connect the drain electrode of field effect transistor Q1, other end ground connection, two inputs of comparator M are connected respectively to the two ends of resistance R 1, its output is connected to the grid of field effect transistor Q1, also comprise a LED warning circuit, the LED warning circuit comprises trigger J, field effect transistor Q2 and light-emitting diode D, described light-emitting diode D positive pole is connected to grounding ports, negative pole is connected to the drain electrode of field effect transistor Q2, the source ground of field effect transistor Q2, the signal controlling end of trigger J is connected to the output of comparator M, the output of trigger J connects the grid of field effect transistor Q2.In this circuit, when grounding ports connects power supply, namely produce pressure drop on resistance R 1, thereby make comparator M upset, close swap switch device field effect transistor Q1, cut off grounding ports and internal circuit, effectively protected internal circuit; Comparator M also controls trigger J, and then controls field effect transistor Q2 and open, and makes the light-emitting diode D that connects with field effect transistor Q2 luminous, reminds the user port wrong.

Further, above-mentioned grounding ports is to being provided with a protective resistance R2 between the source electrode of field effect transistor Q, and protection field effect transistor Q1 avoids field effect transistor Q1 to burn out.

Further, the positive source of above-mentioned comparator M connects grounding ports, power cathode ground connection, because this circuit only needs just to work when grounding ports connects power supply again, need not energising at other times, provided by grounding ports so comparator M starts power supply, after grounding ports connects power supply, start comparator M, can not hinder the work of this circuit.

The beneficial effects of the utility model are: when this circuit connects power supply in the charger grounding ports, namely start, block being connected between grounding ports and internal circuit, protected charger; A LED also is set luminous, reminding user port wrong.

Description of drawings

Fig. 1 is the structural representation of embodiment 1;

Fig. 2 is the structural representation of embodiment 2.

Embodiment

The utility model is described in further detail below in conjunction with embodiment, but structure of the present utility model is not limited only to following examples:

[embodiment 1]

as shown in Figure 1, charger with reverse power connection warning function, comprise a protective circuit, protective circuit is arranged between grounding ports and internal circuit, it comprises resistance R 1, comparator M and field effect transistor Q1, the source electrode of field effect transistor Q1 connects grounding ports, drain electrode connects internal circuit, resistance R 1 one ends connect the drain electrode of field effect transistor Q1, other end ground connection, two inputs of comparator M are connected respectively to the two ends of resistance R 1, its output is connected to the grid of field effect transistor Q1, also comprise a LED warning circuit, the LED warning circuit comprises trigger J, field effect transistor Q2 and light-emitting diode D, described light-emitting diode D positive pole is connected to grounding ports, negative pole is connected to the drain electrode of field effect transistor Q2, the source ground of field effect transistor Q2, the signal controlling end of trigger J is connected to the output of comparator M, the output of trigger J connects the grid of field effect transistor Q2.In this circuit, when grounding ports connects power supply, namely produce pressure drop on resistance R 1, thereby make comparator M upset, close swap switch device field effect transistor Q1, cut off grounding ports and internal circuit, effectively protected internal circuit; Comparator M also controls trigger J, and then controls field effect transistor Q2 and open, and makes the light-emitting diode D that connects with field effect transistor Q2 luminous, reminds the user port wrong.

[embodiment 2]

As shown in Figure 2, the present embodiment is on the basis of embodiment 1, and to being provided with a protective resistance R2 between the source electrode of field effect transistor Q1, protection field effect transistor Q1 avoids field effect transistor Q1 to burn out in grounding ports.

The positive source of the comparator M of the present embodiment connects grounding ports, power cathode ground connection, because this circuit only needs just to work when grounding ports connects power supply again, need not energising at other times, so starting power supply, comparator M provided by grounding ports, after grounding ports connects power supply, start comparator M, can not hinder the work of this circuit.

Claims

1. the charger that has the reverse power connection warning function, comprise a protective circuit, protective circuit is arranged between grounding ports and internal circuit, it comprises resistance R 1, comparator M and field effect transistor Q1, the source electrode of field effect transistor Q1 connects grounding ports, drain electrode connects internal circuit, resistance R 1 one ends connect the drain electrode of field effect transistor Q1, other end ground connection, two inputs of comparator M are connected respectively to the two ends of resistance R 1, its output is connected to the grid of field effect transistor Q1, it is characterized in that, also comprise a LED warning circuit, the LED warning circuit comprises trigger J, field effect transistor Q2 and light-emitting diode D, described light-emitting diode D positive pole is connected to grounding ports, negative pole is connected to the drain electrode of field effect transistor Q2, the source ground of field effect transistor Q2, the signal controlling end of trigger J is connected to the output of comparator M, the output of trigger J connects the grid of field effect transistor Q2.

2. the charger with reverse power connection warning function according to claim 1, is characterized in that, described grounding ports is to being provided with a protective resistance R2 between the source electrode of field effect transistor Q1.

3. the charger with reverse power connection warning function according to claim 1, is characterized in that, the positive source of described comparator M connects grounding ports, power cathode ground connection.