CN201307776Y - Intelligent four-section charger - Google Patents

Abstract

An intelligent four-section charger is characterized by the inclusion of a low-frequency filter circuit, a high-frequency filter circuit, a switch inverter circuit, a high-frequency transformer, a high-frequency rectifier filter and a feedback control circuit, wherein the low-frequency filter circuit and the high-frequency rectifier filter covert the alternating current (AC) input to the direct current (DC) input and output the AC to the switch inverter circuit; the feedback control circuit controls the switch inverter circuit to convert the DC to high-frequency low-voltage current through the high-frequency transformer; the required DC is output by the high-frequency rectifier filter; and the feedback control circuit samples the variation of the DC output by the high-frequency rectifier filter and controls the switch inverter circuit according to the process variation. The charger prolongs the service life of storage batteries.

Description

Intelligent four-stage charger

technical field

The utility model relates to the technical field of switching power supplies, in particular to an intelligent four-stage charger for charging batteries, which is especially suitable for charging batteries used in electric vehicles.

Background technique

At present, there are more and more devices powered by electric energy, such as UPS, electric vehicles, mopeds, etc. Accidents caused by batteries have also become more and more. Many accidents are caused by chargers that cannot be flame-retardant, not resistant to high temperature, not resistant to low cold, without protection, and overcharged. And due to the lack of chargers, the battery is more or less undercharged, overcharged, water loss, vulcanization, imbalance, thermal runaway and other symptoms, which affect the life of the battery. At present, the three-stage chargers that are widely used in the market also have problems such as overcharging, vulcanization, and imbalance, which make the cycle times of the battery pack low and the life span low, causing pollution and waste.

Contents of the invention

In order to solve the above-mentioned problems existing in the prior art, the utility model proposes an intelligent four-stage charger, and the specific technical scheme is as follows:

An intelligent four-stage charger, including a low-frequency filter circuit, a high-frequency rectification filter, a switch inverter circuit, a high-frequency transformer, a high-frequency rectification filter, and a feedback control circuit; the low-frequency filter and the high-frequency rectification filter transform the AC input into direct current and output to the switch inverter circuit; at the same time, the feedback control circuit controls the switch inverter circuit to convert the direct current into high-frequency low-voltage power through a high-frequency transformer; and then outputs the required direct current through a high-frequency rectifier filter; the feedback control circuit The change of the output direct current of the high-frequency rectification filter is sampled, and the switch inverter circuit is controlled according to the change of the process.

The charger also includes a DC sampling detection circuit, the input end of the DC sampling detection circuit is connected to the output end of the high-frequency rectification filter, and the output end of the DC sampling detection circuit is connected to the input end of the feedback control circuit.

The charger also includes a conversion relay J2; the secondary main circuit of the high-frequency transformer is connected to the normally open end of the relay J2; the feedback control circuit is connected to control the pull-in of the relay J2; the middle point of the relay J2 is connected to the input end of the feedback control circuit.

The charger also includes a relay J1; the feedback control circuit controls the pull-in of the relay J1; the middle point of the relay J1 is connected to the output end of the high-frequency rectifier filter, and the normally closed end of the relay J1 is connected to the primary of the high-frequency transformer. The normally open end of the relay J1 is connected to an LED; the normally closed end of the conversion relay J2 is connected to an LED.

The switching inverter circuit uses an integrated control chip integrated with a PWM controller and a MOSFET power switch as a core circuit.

The input end of the charger is also provided with a thermistor.

The high-frequency rectification filter of the charger outputs DC to charge the battery, and the DC sampling detection circuit tracks the change of the charging process and outputs it to the feedback control circuit. The feedback control circuit changes the control switch inverter circuit according to the process change, which can suppress The change of DC output achieves the purpose of intelligent charging. The utility model has the advantages of simple structure and wide application. Full positive pulse charging from start to charge, desulfurization to reduce water loss of the battery, automatic control of the whole process, automatic shutdown after full charge, and overcharge prevention. The utility model has the advantages of simple structure and wide application. With the feedback control circuit as the core, it integrates four-stage management methods of flash charging, constant charging, trickle charging, and off-line shutdown. After testing, the charger can make the cycle times of the accumulator group greatly exceed that of the charger in the prior art, thereby improving the service life of the accumulator.

Description of drawings

Fig. 1 is a schematic block diagram of the utility model.

Fig. 2 is the electrical schematic diagram of the utility model control circuit.

Detailed ways

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

An intelligent four-stage charger, including a low-frequency filter circuit, a high-frequency rectification filter, a switch inverter circuit, a high-frequency transformer, a high-frequency rectification filter, and a feedback control circuit; the low-frequency filter and the high-frequency rectification filter transform the AC input into direct current and output to the switch inverter circuit; at the same time, the feedback control circuit controls the switch inverter circuit to convert the direct current into high-frequency low-voltage power through a high-frequency transformer; and then outputs the required direct current through a high-frequency rectifier filter; the feedback control circuit The change of the output direct current of the high-frequency rectification filter is sampled, and the switch inverter circuit is controlled according to the change of the process. The charger also includes a DC sampling detection circuit, the input end of the DC sampling detection circuit is connected to the output end of the high-frequency rectification filter, and the output end of the DC sampling detection circuit is connected to the input end of the feedback control circuit. The charger also includes a conversion relay J2; the secondary main circuit of the high-frequency transformer is connected to the normally open end of the relay J2; the feedback control circuit is connected to control the pull-in of the relay J2; the middle point of the relay J2 is connected to the input end of the feedback control circuit. The charger also includes a relay J1; the feedback control circuit controls the pull-in of the relay J1; the middle point of the relay J1 is connected to the output end of the high-frequency rectifier filter, and the normally closed end of the relay J1 is connected to the primary of the high-frequency transformer. The normally open end of the relay J1 is connected to an LED; the normally closed end of the conversion relay J2 is connected to an LED. The switching inverter circuit uses an integrated control chip integrated with a PWM controller and a MOSFET power switch as a core circuit. A thermistor is also provided at the input end of the charger.

As shown in Figure 2, in this example, the charger consists of three parts: a 2-pin plug input line, a charger body, and a 3-pin socket output line. Among them, the 2-pin plug input line is connected to the AC mains; the 3-pin socket output line is connected to the battery.

Low-frequency filter 1 and high-frequency rectification filter 2 are composed of thermistor RT, rectifier bridge DD, filter capacitor E1, suction front resistor R2 and capacitor C3, fast recovery diode D1, and relay J1. Mains power enters the low-frequency filter 1 through the input 2-core socket, and outputs high-voltage direct current through the high-frequency rectification filter 2 to the switching inverter circuit 3 . The switch inverter circuit 3 is composed of an integrated control chip Q3TOP227 integrating a current advanced PWM controller and a MOSFET power switch, a resistor R4, and a capacitor E2. IC feedback control circuit 7 is a circuit with U2 (PIC12C5 series stand-alone) as the core. U2 collects output changes and tracks the control terminal of feedback control Q3, thereby suppressing or compensating the output. The output of the switching inverter circuit 3 is connected to the primary of the high-frequency transformer 5, and the secondary output of the high-frequency transformer is three. One is the main circuit, which is composed of fast recovery diode DT, filter capacitor E1', resistor R1', voltage regulator tube Z1', resistors R2', R3', R12', voltage regulator tube D4'; the second is the auxiliary power supply circuit , consisting of rectifier diode D', filter capacitors E2', E3', voltage regulator tube V1', resistor R11' and charging indicator light, this part of the circuit supplies power for the internal control circuit and electric fans; the third circuit is also an auxiliary power supply for Q3 supplies power and is composed of diode D2 and capacitor C4. The secondary main circuit of the high-frequency transformer is connected to the normally open end of the relay J2, and the midpoint of J2 is input to the 2 pin of U2. When U2 tracks and detects the battery status, when the battery is fully charged, the 7 pin of U2 outputs a low level to absorb the J1. Closed, the charger is off the machine, and U2 can realize various protections at the same time. Pin 5 of U2 detects the current tracking feedback and outputs pin 1 to control the integrated power chip Q3. At the same time, pins 3 and 6 of U2 are connected to the wire package of J2 to control the pull-in of J2 to realize the function of reverse polarity protection. Resistor R20' and GZ indicator light are reverse connection indications.

Since the program implementing the method described in this example in the single-chip microcomputer is relatively easy to program for those skilled in the art, and is not the object of protection of the utility model, so no further description is given here.

Claims (7)

1, a kind of intelligent four-part form charger is characterized in that comprising low-frequency filter circuit, filtering high-frequency rectifier device, switching inverter circuit, high frequency transformer, filtering high-frequency rectifier, feedback control circuit; Low frequency filtering, filtering high-frequency rectifier device become exchange input into direct current, export to switching inverter circuit; Simultaneously described direct current is transformed into high frequency low voltage through high frequency transformer by feedback control circuit control switch inverter circuit; Export required direct current through the filtering high-frequency rectifier device again; Feedback control circuit is sampled to the variation of filtering high-frequency rectifier device output DC, and changes according to this process and to come the control switch inverter circuit.

2, intelligent four-part form charger according to claim 1, it is characterized in that also comprising direct current sampling testing circuit, the input of this direct current sampling testing circuit connects filtering high-frequency rectifier device output, and the output of this direct current sampling testing circuit connects the input of feedback control circuit.

3, intelligent four-part form charger according to claim 1 and 2 is characterized in that also comprising switching relay J2; The secondary main circuit of high frequency transformer inserts the Chang Kaiduan of this relay J 2; Feedback control circuit connects the adhesive of control relay J2; The mid point of relay J 2 connects the input of feedback control circuit.

4, intelligent four-part form charger according to claim 3 is characterized in that also comprising relay J 1; The adhesive of feedback control circuit control relay J1; The mid point of this relay J 1 connects the output of filtering high-frequency rectifier device, and the normal-closed end of this relay J 1 connects the elementary of high frequency transformer.

5, intelligent four-part form charger according to claim 4 is characterized in that the Chang Kaiduan of relay J 1 is connected with LED; The normal-closed end of switching relay J2 is connected with LED.

6, intelligent four-part form charger according to claim 1 is characterized in that the circuit that described switching inverter circuit employing is a core with PWM controller and the incorporate integrated control chip of MOSFET power switch.

7, intelligent four-part form charger according to claim 1 is characterized in that also being provided with thermistor at the input of described charger.

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