CN213906334U

CN213906334U - Novel fill electric pile with constant current type charging circuit

Info

Publication number: CN213906334U
Application number: CN202022253615.9U
Authority: CN
Inventors: 王云鹏; 刘晓霖
Original assignee: Neijiang Linghui Electronic Technology Co ltd
Current assignee: Neijiang Linghui Electronic Technology Co ltd
Priority date: 2020-10-12
Filing date: 2020-10-12
Publication date: 2021-08-06
Anticipated expiration: 2030-10-12

Abstract

The utility model discloses a novel constant current type charging circuit for charging pile, which comprises a transformer T1, a rectifier, a charging loop, a conduction loop and a protection loop, wherein the transformer T1 is used for reducing the voltage of the external commercial power, the rectifier is used for rectifying the signal after the voltage reduction, the positive output end of the rectifier is connected with the conduction loop, and the negative output end of the rectifier is grounded; the protection circuit is used for cutting off the conduction circuit when the battery to be charged is fully charged, so that the charging of the battery to be charged by the charging circuit is stopped. The utility model discloses a set up the return circuit that the protection return circuit had both been constituteed by variable resistance RP1 and transistor VT5, can treat that rechargeable battery is full of the time automatic shutdown charges, so can reduce the charging loss of battery, avoid it to appear interference loss, also reduced the working loss of charging circuit itself.

Description

Novel fill electric pile with constant current type charging circuit

Technical Field

The utility model relates to a fill electric pile charging circuit technical field, especially relate to a novel fill electric pile with constant current type charging circuit.

Background

At present, with the gradual improvement of environmental awareness of people, how to save energy and reduce emission becomes an important topic. The automobile keeping quantity in China is rising year by year, and the pollution caused by automobile exhaust is not a little. The influence of the electric automobile on the environment is smaller than that of the traditional automobile, and the prospect of the electric automobile is widely seen. Electric vehicles are also more and more favored by people, and more electric automobiles enter the lives of people, so that convenience is brought to people. The charging pile is used as an important matching infrastructure and an energy supply device necessary for developing the electric automobile, and the charging performance of the charging pile is related to the service life and the charging time of the battery pack, so that how to design a charging circuit is very critical. At present, a charging circuit of a general charging pile adopts a constant current charging mode, namely, constant current charging, but when charging is completed soon, the charging pile still continues to charge with fixed current, and the charging pile must increase voltage in order to maintain the constant current, so that the risk of battery damage caused by overcharge can occur. Therefore, it is very important to provide a novel constant current charging circuit for a charging pile.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a: in order to overcome the defects, the novel constant current type charging circuit for the charging pile is provided, so that the energy consumption of the charging circuit is reduced while the damage to a battery to be charged is reduced.

In order to achieve the above purpose, the technical scheme of the utility model is that: a novel constant current type charging circuit for a charging pile comprises a transformer T1, a rectifier, a charging loop, a conduction loop and a protection loop, wherein the transformer T1 is used for reducing voltage of external commercial power, the rectifier is used for rectifying a signal after voltage reduction, the positive output end of the rectifier is connected with the conduction loop, and the negative output end of the rectifier is grounded; the protection circuit is used for cutting off the conduction circuit when the battery to be charged is fully charged, so that the charging of the battery to be charged by the charging circuit is stopped.

Furthermore, the charging loop comprises a transistor VT1, a switch S1 and resistors R1-R3, the collector of the transistor VT1 is connected with the battery to be charged, the base of the transistor VT1 is connected with the conducting loop, the switch S1 is a single-pole-three-throw switch, the emitter of the transistor VT1 is connected with the stationary end of the switch S1, and the movable end of the switch S1 is respectively connected with one ends of the resistors R1-R3.

Furthermore, the conducting loop comprises resistors R5-R9, transistors VT 2-VT 4 and a variable resistor RP2, the resistor R9 is connected with the positive output end of the rectifier, the emitter of the transistor VT2 is connected with the charging loop, and the base of the transistor VT4 is connected with the protection loop.

Further, the protection loop comprises a variable resistor RP1, a transistor VT5 and a resistor R10, wherein one end of the variable resistor RP1 is connected with the battery to be charged, the moving end of the variable resistor RP1 is connected with the base electrode of the transistor VT5, the collector electrode of the transistor VT5 is connected with the base electrode of the transistor VT4 and one end of the resistor R10, and the other end of the resistor R10 is grounded.

Since the proposal is adopted, the beneficial effects of the utility model reside in that: the utility model provides a novel fill electric pile with constant current type charging circuit, its benefit is:

(1) the utility model discloses a set up the return circuit that the protection return circuit had both been constituteed by variable resistance RP1 and transistor VT5, can treat that rechargeable battery is full of the time automatic shutdown charges, so can reduce the charging loss of battery, avoid it to appear interference loss, also reduced the working loss of charging circuit itself.

(2) The utility model discloses a last resistance of three kinds of different resistances of having connected of charging circuit for charging current's negative feedback volume is adjustable, has improved the stability when charging.

(3) The utility model discloses a switch on the return circuit and adopt a plurality of transistors combination to use, quick transistor response has shortened the operating duration that switches on return circuit self to accelerate the turn-on rate in whole charging circuit, guaranteed the stability of charging.

Drawings

Fig. 1 is a circuit diagram of the charging circuit of the present invention.

Detailed Description

The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

Examples

As shown in FIG. 1, a novel constant current type charging circuit for a charging pile is arranged between an external power supply and a battery to be charged, and comprises a transformer T1, resistors R1-R10, variable resistors RP 1-RP 2, a capacitor C1, a switch S1, diodes VD 1-VD 7, transistors VT 1-VT 5, diodes VD 1-VD 4 form a rectifier, and a switch S1 is a single-pole three-throw switch.

Two ends of a primary coil of the transformer T1 are connected with an external mains supply, two ends of a secondary coil of the transformer T1 are respectively connected with input ends of a rectifier, one output end of the rectifier is connected with one end of a capacitor C1, a resistor R4, a variable resistor RP1, one end of a resistor R9, an emitter of a transistor VT3 and an emitter of a transistor VT5, the other end of the resistor R4 is connected with one end of a diode VD5, the other end of the variable resistor RP1 is connected with one end of a resistor R5, a moving end of the variable resistor RP1 is connected with a base of the transistor VT5, the other end of the resistor R5 is connected with a collector of the transistors VT 5-VT 5, an emitter of the transistor VT5 is connected with a base of the transistor VT5, an emitter of the transistor VT5 is connected with a stationary end of a switch S5, three moving ends of the switch S5 are respectively connected with one ends of the resistors R5-VD 5, a collector of the transistor VT5 is connected with one end of the resistor VD5, the other end of the resistor R6 is connected to one end of the variable resistor RP2 and the diode VD 7; the movable end of the variable resistor RP2 is connected with the base of a transistor VT2, the other end of the variable resistor RP2 is connected with one end of a resistor R7, the base of the transistor VT3 is connected with the other end of a resistor R9 and the emitter of a transistor VT4, and the base of the transistor VT4 is connected with the collector of the transistor VT5 and one end of a resistor R10; the capacitor C1, the resistors R1-R3, the resistor R7, the resistor R10, the diode VD5, the other end of the diode VD7, the collector of the transistor VT4 and the other output end of the rectifier are all grounded.

One end of the resistor R4 and the other end of the resistor R5 are also connected with an external rechargeable battery as output ends of the circuit.

Specifically, after the voltage of the external commercial power is reduced by a transformer T1, a low-voltage alternating-current voltage is output, the low-voltage alternating-current voltage is rectified by a bridge rectifier circuit composed of diodes VD 1-VD 4, and after the low-voltage alternating-current voltage is filtered by a capacitor C1, a direct-current voltage is obtained at two ends of the capacitor C1 so as to be used by a subsequent circuit. The power voltage is transmitted to the diode VD5 through the resistor R4, and the diode VD5 is powered to start discharging light, so as to indicate that the charging circuit is powered on at this time. The battery to be charged is connected between the output end of the charging circuit, namely A, B two points, when the battery to be charged is connected into the circuit, the battery voltage passes through the resistor R5 and the variable resistor RP1, and the movable end of the variable resistor RP1 is divided. If the battery voltage is insufficient, the resistor RP1 is not divided into two parts, so that the transistor VT5 has enough base current, i.e. the transistor VT5 is turned off, and the section is open-circuit, so that the battery to be charged can enter a charging state.

Further, the power voltage continues to pass through the loop formed by the resistor R9, the emitter and the base of the transistor VT4, and the resistor R10, that is, the transistor VT4 obtains enough base current at this time, the transistor VT4 is turned on, the emitter voltage of the transistor VT4 is decreased, the base voltage of the transistor VT3 connected with the emitter of the transistor VT4 is decreased, and the transistor VT3 is turned on. The collector current of the transistor VT3 flows to the ground through the resistor R8, the diode VD6 and the resistors R6-R7, and the variable resistor RP2 divides the voltage of the signal, and similarly, the movable end of the variable resistor RP2 obtains the divided voltage value. And when the collector current of the transistor VT3 flows through the diode VD6, the diode VD6 is powered and starts to discharge light, so as to show that it is in a charged state at this time.

Further, the moving terminal of the variable resistor RP2 is connected to the base of the transistor VT2, and the signal transmitted by the resistor RP 3578 can make the transistor VT2 conduct, and the emitter of the transistor VT2 is connected to the base of the transistor VT1, so that the transistor VT1 is also conducted, that is, the whole charging circuit is conducted, and charging can be started. The power supply voltage is transmitted to the conducted transistor VT1 through the negative electrode of the battery to be charged and then transmitted to the ground, so that the collector current flowing through the transistor VT1 is the charging current of the battery to be charged, and the base current of the transistors VT 1-VT 2 can be changed by adjusting the variable resistor RP2, so that the conduction internal resistance of the transistor VT1 is changed, and the charging current of the battery to be charged can be changed. And the emitter of the transistor VT1 is connected with three resistors with different resistance values through the switch S1, so that the negative feedback quantity of different charging currents can be changed, and the stability of the whole charging circuit is improved.

Namely, the loop through which the whole charging current flows is: power supply positive electrode → battery positive electrode to be charged → battery negative electrode to be charged → collector of the transistor VT1 → emitter of the transistor VT1 → the resistor R1(R2, R3) → ground. And with the continuous charging of the battery to be charged, the voltage at the two ends of the battery will gradually rise, when the voltage rises to a certain value (that is, the battery is fully charged), the voltage division value at the movable end of the variable resistor RP1 rises, then the base current of the transistor VT5 increases and is in an on state, and the collector voltage of the transistor VT5 rises and approaches the power voltage value, so that the transistor VT4 is in an off state because of the rise of the base voltage, when the transistor VT4 is turned off, the emitter voltage thereof rises, the base voltage of the transistor VT3 also rises, the transistor VT3 has no base current and is in an off state, when the transistor VT3 is turned off, the collector thereof has no output current, then the diode VD6 loses power, and is turned off, thereby indicating that the current charging is finished. At this time, the variable resistor RP2 also has no current flow, and the moving end thereof has no voltage division value, so that the transistors VT 1-VT 2 also have no base current, and when the transistor VT1 is turned off, the internal resistance thereof is increased, and the loop of the charging current of the battery to be charged is cut off, thereby the whole charging process is finished.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing embodiments, or equivalents may be substituted for elements thereof. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The utility model provides a novel fill electric pile with constant current type charging circuit which characterized in that: the transformer T1 is used for reducing voltage of external commercial power, the rectifier is used for rectifying a signal after voltage reduction, the positive output end of the rectifier is connected with the conduction loop, and the negative output end of the rectifier is grounded; the protection circuit is used for cutting off the conduction circuit when the battery to be charged is fully charged, so that the charging of the battery to be charged by the charging circuit is stopped; the charging loop comprises a transistor VT1, a switch S1 and resistors R1-R3, a collector of the transistor VT1 is connected with a battery to be charged, a base electrode of the transistor VT1 is connected with the conducting loop, the switch S1 is a single-pole three-throw switch, an emitter of the transistor VT1 is connected with a fixed end of the switch S1, and a movable end of the switch S1 is connected with one ends of the resistors R1-R3 respectively.

2. The constant current type charging circuit for the novel charging pile according to claim 1, characterized in that: the conducting loop comprises resistors R5-R9, transistors VT 2-VT 4 and a variable resistor RP2, a resistor R9 is connected with the positive output end of the rectifier, an emitter of a transistor VT2 is connected with the charging loop, and a base of a transistor VT4 is connected with the protection loop.

3. The constant current type charging circuit for the novel charging pile according to claim 1, characterized in that: the protection loop comprises a variable resistor RP1, a transistor VT5 and a resistor R10, wherein one end of the variable resistor RP1 is connected with a battery to be charged, the moving end of the variable resistor RP1 is connected with the base electrode of the transistor VT5, the collector electrode of the transistor VT5 is connected with the base electrode of the transistor VT4 and one end of the resistor R10, and the other end of the resistor R10 is grounded.