Stepless voltage regulation charging circuit diagram

Probe current voltage pin 420*4450 head diameter 5.0 over current current and voltage pin

Shunuo varistor / ESD varistor / product complete / Sunlord first-class agent

TP-IP4220CZ6 5V 0.35PF breakdown voltage 6V SOT

Adjustable capacitor Murata genuine original

TZC3Z030A110R00 MURATA Murata adjustable capacitor original spot

Overview:

First, the stepless voltage regulator (flow) charger in the rectifier transformer primary series connected to a commercially available fan speed controller (roasting fire box thermostat), change the input power frequency voltage can achieve the purpose of stepless voltage regulation. Although the output waveform is not good, it has proven to be feasible.
When charging, as long as the charging current is adjusted to meet the requirements, the voltage is definitely appropriate. (Except for the battery itself is faulty).
Only when the battery polarity is correct, the relay only pulls in and closes the charging circuit.
When the battery has too little power remaining, or charge the battery below 12V, the charger needs to be connected to the mains, press AN to help start. The 100Ω resistor maintains the pull of J. The contact capacity of the relay is greater than. 10A (for double contacts in parallel).
The negative circuit is composed of three 1Ω resistors (=0.333Ω), which is used to form the differential voltage detection current. The higher the output voltage and the larger the current, the larger the voltage drop. The ammeter is actually a voltmeter, except that the setting value is the current number. I used a cheap 91L16300V small square meter, removed the 220k step-down resistor connected in series, and re-set the standard value.
The following figure shows the basic circuit of the stepless voltage regulator charger. When manufacturing, the capacity of the rectifier transformer and the secondary voltage and rectifier diode can be selected according to the needs.

Charging current selection: 4 ~ 6Ah, select 500mA or less; 7 ~ 15Ah. Choose 800mA-1.5A; choose 2A above 15Ah.

Second, high-frequency high-efficiency charger high-frequency charger, small body weight, fast charging, battery has no obvious memory effect.
The left side of the dotted line below. It is a ready-to-use 60W energy-saving fluorescent electronic ballast circuit. The printed board is small and used in one piece. Connect the output lines at both ends of the lamp to the primary of the modified color TV switch transformer.
When the switching transformer is modified, the primary and inter-stage insulation is completely preserved (there are also windings in the primary inner layer). Remove all secondary windings and record the number of turns in each group to calculate the number of turns per turn. For O.46V ~ O.60V, and then use the enameled wire of 0-7mm to rewind the voltage turns you need. In the middle, a few more heads are taken. When the time comes, the estimation is not allowed to be used. Winding volts selected: Half-wave rectified, charged bottle voltage V (nominal) × 2.5. Such as: nominal 12V battery × 2.5, equal to 30V (AC). Full-wave rectification is halved.
1HB is a positive and negative feedback small loop change. If light load is difficult to start (no output), its L1 can be increased by 1~2匝.
When the charging current exceeds 1A, V1 and V2 will be a little hot. Remove the appropriate heat sink, set up the position, and connect the wire to the original circuit board.
Right side of the dotted line, rectification and charging output circuit. ZK is set to facilitate conversion when charging 6V and 12V batteries. ZK's contact capacity is greater than 5A, and try to be quiet operation (before power-on).
The rectifier D1 must use high-frequency diodes, ordinary power frequency diodes or rectifier bridges, and the recovery speed is slow, the loss is large, and the heat is severely damaged (discarded VCD, the power supply board of the digital machine).
R11. A voltage drop occurs during charging, and the higher the current, the higher the voltage drop. This pressure difference is just an LED for charging indication, not full of light. The charging output should be clearly connected to the pole with red and black.
The charging current is selected, refer to the previous description.
This charger has high frequency and high voltage and should be installed in a box to ensure safety. 2HB primary is never allowed to open circuit with the left side circuit. Otherwise, the left circuit will have a high voltage (no load) of kilovolts, causing damage to the left circuit.