CN213185598U

CN213185598U - Charging circuit capable of achieving zero-voltage charging

Info

Publication number: CN213185598U
Application number: CN202021290934.0U
Authority: CN
Inventors: 王定国; 李嘉玲
Original assignee: Dongguan Sunstrong Electric Machinery Co ltd
Current assignee: Dongguan Sunstrong Electric Machinery Co ltd
Priority date: 2020-07-03
Filing date: 2020-07-03
Publication date: 2021-05-11
Anticipated expiration: 2030-07-03

Abstract

The utility model discloses a can reach zero voltage and play charging circuit who fills, it is including the AC input that connects gradually, rectifier module, input filter module, transformer module, output filter module and DC output, be connected with zero voltage between input filter module and the transformer module and play and fill protection module, this zero voltage plays and fills protection module including control chip, control chip ' S model is DK913, input filter module is connected to this control chip ' S OC foot, this control chip ' S FB foot is connected with first, second divider resistance, first divider resistance connects transformer module, second divider resistance ground connection, be equipped with the MOS pipe between the negative pole of output filter module and DC output, the positive pole of connecting the DC output behind the stabilivolt is connected to the G utmost point of MOS pipe, and be connected with first diode and first resistance between the D utmost point and the S utmost point of MOS pipe. The utility model discloses circuit structure is simple, and is with low costs to can reach zero voltage and play to fill, it is very convenient to use.

Description

Charging circuit capable of achieving zero-voltage charging

The technical field is as follows:

the utility model relates to a technical field that charges refers in particular to a can reach zero voltage and play charging circuit who fills.

Background art:

at present, many mobile household electrical appliances have batteries, and a charger is required to be configured to charge the batteries. The household electrical appliances all need a control panel with battery collocation, and the circuit on this control panel can cause the intangible discharge of battery, will put the battery power down for a long time, forms battery voltage very low or 0V's state, and general charger can't charge to this product this moment, can cause the difficulty in using.

In view of the above, the present inventors propose the following.

The utility model has the following contents:

an object of the utility model is to overcome prior art's is not enough, provide a charging circuit that can reach zero voltage and play to fill.

In order to solve the technical problem, the utility model discloses a following technical scheme: the charging circuit capable of achieving zero-voltage charging comprises an AC input end, a rectifying module, an input filtering module, a transformer module, an output filtering module and a DC output end which are connected in sequence, wherein a zero-voltage charging protection module is connected between the input filtering module and the transformer module, the zero-voltage charging protection module comprises a control chip, the control chip is DK913, an OC pin of the control chip is connected with the input filtering module, an FB pin of the control chip is connected with a first divider resistor and a second divider resistor, the first divider resistor is connected with the transformer module, the second divider resistor is grounded, an MOS (metal oxide semiconductor) tube is arranged between the output filtering module and the negative electrode of the DC output end, a G electrode of the MOS tube is connected with the positive electrode of the DC output end after being connected with a voltage stabilizing tube, and a first diode and a first resistor are connected between the D electrode and the S electrode of the MOS tube.

Further, in the above technical solution, the IS pin of the control chip IS connected to the transformer module after being connected to the resistor R15; the VCC pin of the control chip is connected with the electrolytic capacitor CE3 and then is connected with the transformer module; and a capacitor C1 is also connected in parallel at two ends of the first voltage dividing resistor.

Furthermore, in the above technical solution, the transformer module includes an absorption loop and a transformer connected to the absorption loop, a primary coil of the transformer is connected to the absorption loop and the electrolytic capacitor CE3, a resistor R15 and a first voltage dividing resistor, a secondary coil of the transformer is connected to the output filter module after being connected to a second diode D21, and two ends of the second diode D21 are connected in parallel to a resistor R21 and a capacitor 21.

Further, in the above technical solution, the rectifying module includes a rectifying chip.

Further, in the above technical solution, the input filter module includes a first inductor L1 and a second inductor L2 connected to the output end of the rectifier chip, an electrolytic capacitor CE1 and an electrolytic capacitor CE2 connected between the first inductor L1 and the second inductor L2, and a resistor RL connected to both ends of the first inductor L1.

Further, in the above technical solution, the output filter module includes an electrolytic capacitor EC21 and a capacitor C22 that are connected in parallel.

Further, in the above technical solution, a fuse F1 is connected between the AC input terminal and the rectifying module.

After the technical scheme is adopted, compared with the prior art, the utility model has following beneficial effect: the utility model discloses circuit structure is simple, and is with low costs to can reach zero voltage and play to fill, it is very convenient to use, the order the utility model discloses extremely strong market competition has.

Description of the drawings:

fig. 1 is a circuit diagram of the present invention.

The specific implementation mode is as follows:

the present invention will be further described with reference to the following specific embodiments and accompanying drawings.

As shown in fig. 1, a charging circuit capable of achieving zero voltage charging includes an AC input terminal 1, a rectifying module 2, an input filter module 3, a transformer module 4, an output filter module 5, and a DC output terminal 6, which are connected in sequence, a zero voltage charging protection module 7 is connected between the input filter module 3 and the transformer module 4, the zero voltage charging protection module 7 includes a control chip 71, the control chip 71 is DK913 in type, an OC pin of the control chip 71 is connected to the input filter module 3, an FB pin of the control chip 71 is connected to a first voltage dividing resistor 72 and a second voltage dividing resistor 73, the first voltage dividing resistor 72 is connected to the transformer module 4, the second voltage dividing resistor 73 is grounded, an MOS 74 is disposed between the output filter module 5 and a negative electrode 62 of the DC output terminal 6, a G electrode of the MOS 74 is connected to a positive electrode 61 of the DC output terminal 6 after being connected to a regulator 75, and a first diode 76 and a first resistor 77 are connected between the D pole and the S pole of the MOS transistor 74. The utility model discloses an it contains the control chip control of (primary peak current detection circuit, former limit feedback crossflow, former limit cross pressure control, Vcc self-supply circuit, output line voltage compensation function) to have integrateed 700V high pressure MOS and circuit controller the utility model discloses a reach the purpose that zero voltage played and filled, control chip 71's model is DK913, and this control chip 71 periphery is as long as few electronic components, and the transformer in the transformer module 4 is as long as two sets of windings (need not assist the power supply winding). The FB pin set output voltage of the control chip 71 is set by the first voltage dividing resistor 72 and the second voltage dividing resistor 73, and since the control chip has a secondary short-circuit protection function, when the secondary short-circuit occurs, the FB pin voltage of the control chip 71 is lower than 1.2V and exceeds 32ms, the control chip automatically protects, so that the MOS tube 74, the voltage regulator tube 75, the first diode 76 and the first resistor 77 are additionally arranged on the secondary side to make the FB pin voltage of the control chip 71 not lower than 1.2V. When the battery voltage connected with the DC output terminal is lower than 4V, since the driving voltage threshold of the MOS transistor 74 is 2V and the operating voltage of the voltage regulator 75 is 2V, when the battery voltage is lower than 4V, the voltage regulator 75 is not turned on, the MOS transistor 74 does not operate, the charging current passes through the first diode 76 and the first resistor 77, and at this time, the charging is performed by a small current, (4V-0.7V)/22 Ω is 0.168A, even when the battery voltage is 0V, the battery can be charged by the present invention; when the battery voltage is higher than 4V, the voltage regulator tube 75 is conducted enough to drive the MOS tube 74 to operate, and then a high-current charging cross-current voltage state is entered. That is to say, the utility model discloses circuit structure is simple, and is with low costs to can reach zero voltage and play to fill, it is very convenient to use, the order the utility model discloses extremely strong market competition has.

The IS pin of the control chip 71 IS connected with the resistor R15 and then IS connected with the transformer module 4; the VCC pin of the control chip 71 is connected with the electrolytic capacitor CE3 and then connected with the transformer module 4, and the self-power supply is arranged in the control chip 71 to charge the electrolytic capacitor CE 3; a capacitor C1 is also connected in parallel across the first voltage dividing resistor 72.

The transformer module 4 includes an absorption loop 41 and a transformer 42 connected to the absorption loop 41, a primary coil of the transformer 42 is connected to the absorption loop 41, the electrolytic capacitor CE3, a resistor R15 and a first voltage dividing resistor 72, a secondary coil of the transformer 42 is connected to the output filter module 5 after being connected to a second diode D21, and two ends of the second diode D21 are connected in parallel to a resistor R21 and a capacitor 21.

The rectifying module 2 includes a rectifying chip 21.

The input filter module 3 comprises a first inductor L1 and a second inductor L2 connected to the output end of the rectifier chip 21, an electrolytic capacitor CE1 and an electrolytic capacitor CE2 connected between the first inductor L1 and the second inductor L2, and a resistor RL connected to both ends of the first inductor L1, and the input filter module 3 has a good filtering effect.

The output filtering module 5 comprises an electrolytic capacitor EC21 and a capacitor C22 which are connected in parallel.

Be connected with fuse F1 between AC input 1 and the rectifier module 2, the order the utility model discloses use safe and reliable more.

To sum up, the utility model discloses circuit structure is simple, and is with low costs to can reach zero voltage and play to fill, it is very convenient to use, the order the utility model discloses extremely strong market competition has.

Of course, the above description is only an exemplary embodiment of the present invention, and not intended to limit the scope of the present invention, and all equivalent changes and modifications made by the constructions, features, and principles of the present invention in accordance with the claims of the present invention are intended to be included in the scope of the present invention.

Claims

1. The utility model provides a charging circuit that can reach zero voltage and start to charge, its is including AC input (1), rectifier module (2), input filter module (3), transformer module (4), output filter module (5) and DC output (6) that connect gradually, its characterized in that: a zero-voltage charging protection module (7) is connected between the input filter module (3) and the transformer module (4), the zero-voltage charging protection module (7) comprises a control chip (71), the type of the control chip (71) is DK913, the OC pin of the control chip (71) is connected with the input filter module (3), the FB pin of the control chip (71) is connected with a first voltage dividing resistor (72) and a second voltage dividing resistor (73), the first voltage dividing resistor (72) is connected with the transformer module (4), the second voltage dividing resistor (73) is grounded, an MOS tube (74) is arranged between the output filter module (5) and the negative electrode (62) of the DC output end (6), the G pole of the MOS tube (74) is connected with a voltage stabilizing tube (75) and then connected with the anode (61) of the DC output end (6), and a first diode (76) and a first resistor (77) are connected between the D pole and the S pole of the MOS tube (74).

2. The charging circuit of claim 1, wherein said charging circuit is capable of achieving zero voltage charging, and further comprising: the IS pin of the control chip (71) IS connected with the resistor R15 and then IS connected with the transformer module (4); the VCC pin of the control chip (71) is connected with the electrolytic capacitor CE3 and then is connected with the transformer module (4); and a capacitor C1 is also connected in parallel at two ends of the first voltage dividing resistor (72).

3. A charging circuit capable of achieving zero-voltage start-up according to claim 2, wherein: the transformer module (4) comprises an absorption loop (41) and a transformer (42) connected with the absorption loop (41), a primary coil of the transformer (42) is connected with the absorption loop (41) and the electrolytic capacitor CE3, a resistor R15 and a first voltage dividing resistor (72), a secondary coil of the transformer (42) is connected with the output filter module (5) after being connected with a second diode D21, and two ends of the second diode D21 are connected with a resistor R21 and a capacitor 21 in parallel.

4. A charging circuit capable of achieving zero-voltage start-up according to any one of claims 1-3, wherein: the rectifying module (2) comprises a rectifying chip (21).

5. The charging circuit of claim 4, wherein the charging circuit is capable of achieving zero voltage charging, and comprises: the input filter module (3) comprises a first inductor L1 and a second inductor L2 which are connected with the output end of the rectifying chip (21), an electrolytic capacitor CE1 and an electrolytic capacitor CE2 which are connected between the first inductor L1 and the second inductor L2, and a resistor RL which is connected with two ends of the first inductor L1.

6. A charging circuit capable of achieving zero-voltage start-up according to any one of claims 1-3, wherein: the output filtering module (5) comprises an electrolytic capacitor EC21 and a capacitor C22 which are mutually connected in parallel.

7. A charging circuit capable of achieving zero-voltage start-up according to any one of claims 1-3, wherein: and a fuse F1 is connected between the AC input end (1) and the rectifying module (2).