A pulse fast charger for electric bicycle

Abstract

The utility model provides a kind of pulse fast charger for electric bicycle, including charger structure and radiator structure, the radiator structure is installed inside charger structure, the charger structure includes charger upper cover, charger circuit board and charger plastic bottom shell, the charger upper cover and charger plastic bottom shell constitute the shell structure of charger structure, the shell structure inside installation radiator structure and charger circuit board, the charger circuit board includes first circuit unit, second circuit unit, third circuit unit and fourth circuit unit.The utility model has beneficial effect: the utility model uses group pulse control mode to charge battery, timely inhibits the side reaction of electrolyte, reduces the evolution of gas, reduces battery charging heat generation.Can realize large current charging, improve charging speed;Also can solve the harm that large current charging brings to battery.

Description

Technical Field

[0001] This utility model belongs to the field of charger, pulse control, and lead-acid battery charging and discharging technology, and in particular relates to a pulse fast charger for electric bicycles. Background Technology

[0002] Currently, fast chargers for lead-acid batteries in electric bicycles can quickly replenish some power when the battery is suddenly low during daily commutes or temporary trips (e.g., 10-20 minutes of charging can support short-distance riding), avoiding the embarrassment of pushing the bike while walking. They are especially suitable for scenarios with long commutes and insufficient charging facilities. However, most fast chargers for lead-acid batteries in electric bicycles on the market use the traditional three-stage charging method, which has problems such as battery overheating, gas evolution, and overcharging. This leads to problems such as decreased battery capacity, increased internal resistance, and even bulging, affecting battery life or rendering the battery unusable. Utility Model Content

[0003] In view of this, the present invention aims to provide a pulse fast charger for electric bicycles to solve at least one of the problems existing in the prior art.

[0004] To achieve the above objectives, the technical solution of this utility model is implemented as follows: A pulse fast charger for electric bicycles includes a charger structure and a heat sink structure. The heat sink structure is installed inside the charger structure. The charger structure includes a charger top cover, a charger circuit board, and a charger plastic bottom shell. The charger top cover and the charger plastic bottom shell form the housing structure of the charger structure. The heat sink structure and the charger circuit board are installed inside the housing structure. The charger circuit board includes a first circuit unit, a second circuit unit, a third circuit unit, and a fourth circuit unit. The first circuit unit is connected to the second circuit unit and the third circuit unit, respectively. The second circuit unit is connected to the third circuit unit and the fourth circuit unit.

[0005] Furthermore, the first circuit unit includes a voltage-regulating resistor RT1, a varistor RV1, a fuse F1, a rectifier bridge Z1, a capacitor C1, resistors R1A, R1, R3, R3A, R3B, and R3C, a capacitor C06, resistors R2*6, diodes D6 and D5, resistors R11A and R11, and a capacitor C8; pins one and three of the rectifier bridge Z1 are respectively connected to the varistor RV1 and the voltage-regulating resistor RT1 for voltage regulation. Resistor RT1 is connected to fuse F1; pins 2 and 4 of rectifier bridge Z1 are connected to capacitor C1, resistor R1A, resistor R1, resistor R3, resistor R3A, resistor R3B, and resistor R3C respectively. Pin 2 of rectifier bridge Z1 is also connected to capacitor C06 and resistor R2*6. Capacitor C06 and resistor R2*6 are connected to the third circuit unit through diode D6. Resistor R3C is also connected to capacitor C8 and diode D5 respectively. Diode D5 is also connected to resistor R11A and resistor R11 respectively.

[0006] Furthermore, the second circuit unit includes resistor R4A, diode D4, main MOSFET Q1, resistors R4, R04, R9, R09, capacitor C12, resistor R6, chip IC1, capacitor C10, resistor R8B, resistor RT3, capacitor C11, capacitor C9, chip IC2, resistors R13, R14, RV1, RV2, RV3, capacitor CVA1, resistor RVA6, resistor RLA6, capacitor CLA1, resistor RLA1, resistor RL1, resistor RL5, capacitor CL1, terminal block 1, and capacitor C45; pin 6 of chip IC1 is connected to resistors R4A and R4 respectively, resistor R4A is connected to resistor R04 and main MOSFET Q1 through diode D4, pin 3 of chip IC1 is connected to resistors R09, R9, and capacitor C12 respectively, resistor R09 is also connected to main MOSFET Q1 through resistor R6, and main MOSFET Q1 is also connected to... In the third circuit unit, pin 4 of chip IC1 is connected to resistor R8B and capacitor C11 respectively. Resistor R8B is connected to resistor RT3. Pin 8 of chip IC1 is connected to capacitor C10. Pin 1 of chip IC1 is connected to capacitor C9 and chip IC2 respectively. Chip IC2 is also connected to resistor R13 and resistor R14 respectively. Resistor R14 is connected to resistor RVA6, resistor RLA6 and pin 11 of terminal block 1 respectively. Resistor RVA6 is connected to capacitor CVA1. Resistor RLA6 is connected to capacitor CLA1. Pin 10 of terminal block 1 is connected to capacitor CVA1, resistor RV1, resistor RV2 and resistor RV3 respectively. Resistor RV1 and resistor RV2 are connected to the third circuit unit and the fourth circuit unit respectively. Pin 12 of terminal block 1 is connected to capacitor CLA1 and resistor RLA1 respectively. Resistor RLA1 is also connected to resistor RL1. Pin 13 of terminal block 1 is connected to resistor RL5. Resistor RL5 is also connected to capacitor CL1. Pins 5 and 6 of terminal block 1 are both connected to capacitor C45.

[0007] Furthermore, the third circuit unit includes a transformer T1, a capacitor C14, a diode D19, resistors R5*6, a capacitor C7, a resistor R23, a resistor RJ*8, a transistor QP1, a capacitor C20, a resistor RQ2, a resistor RQ3, a diode IC3, a resistor RQ1, a resistor RP2, a resistor RP4, a resistor RP1, a resistor RP3, a capacitor C28, and a diode D18; the sixth and seventh pins of the transformer T1 are respectively connected to capacitor C14, diode D19, and resistor R5*6, and capacitor C14 is also connected to resistor R23 and resistor RJ*8. *8, Resistor R5*6 is also connected to capacitor C7. The tenth pin of transformer T1 is connected to capacitor C28, resistor RP1, resistor RP2, resistor RQ1, and one pin of transistor QP1 via diode D18. Resistors RP1 and RP2 are connected to resistors RP3 and RP4 respectively. Resistors RP3 and RP4 are both connected to the fourth circuit unit, resistor RV1, and resistor RV2. The second pin of transistor QP1 is also connected to diode IC3 and resistor RQ1. The three pins of transistor QP1 are connected to resistor RQ2 and capacitor C20 respectively. Resistor RQ2 is also connected to resistor RQ3.

[0008] Furthermore, the fourth circuit unit includes capacitor CRC2, resistor RC2, resistor RC1, diode QF1, transistor QF2, resistor RQF4, resistor RQF3, resistor RQF2, resistor RQF1, capacitor C16, resistor RH1, resistor RH2, resistor RH3, resistor RH5, and capacitor CH1; the three pins of transistor QF2 are respectively connected to resistor RQF1, resistor RQF3, capacitor C16, resistor RP3, and resistor RP34; one pin of transistor QF2 is respectively connected to resistor RH1 and resistor RH2; resistors RH1 and RH2 are both connected to capacitor CH1, resistor RH3, and resistor RH5; the two pins of transistor QF2 are respectively connected to resistor RQF1, resistor RQF2, resistor RQF3, and resistor RQF4; resistor RQF4 is connected to capacitor CRC2 and resistor RC2 through diode QF1; and resistor RC2 is connected to resistor RC1.

[0009] Furthermore, the heat sink structure includes a heat sink, a cooling fan, a heat dissipation structure at the main MOSFET, and a plastic tray. The plastic tray is installed on the upper part of the inside of the charger's plastic bottom shell, and the heat sink is installed on top of the plastic tray. A cooling fan is installed on one side of the heat sink, and the cooling fan is located inside the charger's plastic bottom shell. A transformer is installed on the left side of the bottom of the heat sink, and the charger circuit board is installed on the bottom of the heat sink. The heat dissipation structure at the main MOSFET is installed on the right side of the bottom of the heat sink, and the main MOSFET is installed on one side of the heat dissipation structure at the main MOSFET.

[0010] Compared with existing technologies, the pulse fast charger for electric bicycles described in this utility model has the following advantages: This invention relates to a pulse fast charger for electric bicycles. It utilizes a group pulse control method to charge the battery, effectively suppressing side reactions in the electrolyte, reducing gas evolution, and lowering battery charging heat. It enables high-current charging, increasing charging speed, and also eliminates the harmful effects of high-current charging on the battery. Attached Figure Description

[0011] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of the utility model. The illustrative embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an undue limitation of the utility model. In the drawings: Figure 1 This is a schematic diagram of the charger structure circuit according to an embodiment of the present utility model; Figure 2 This is a partial schematic diagram of the heat sink structure described in an embodiment of the present utility model; Figure 3 This is a schematic diagram of the heat sink and the heat dissipation structure at the main MOS as described in an embodiment of this utility model; Figure 4 This is a cross-sectional view of the heat sink structure according to an embodiment of the present invention.

[0012] Explanation of reference numerals in the attached figures: 1. Heat sink; 2. Cooling fan; 3. Charger plastic bottom shell; 4. Heat dissipation structure at the main MOSFET; 5. Main MOSFET; 6. Charger circuit board; 7. Transformer; 8. Plastic tray. Detailed Implementation

[0013] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments of the present invention can be combined with each other.

[0014] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0015] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0016] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0017] like Figures 1 to 4 As shown, a pulse fast charger for electric bicycles includes a charger structure and a heat sink structure. The heat sink structure is installed inside the charger structure. The charger structure includes a charger top cover, a charger circuit board 6, and a charger plastic bottom shell 3. The charger top cover and the charger plastic bottom shell 3 form the shell structure of the charger structure. The heat sink structure and the charger circuit board 6 are installed inside the shell structure. The charger circuit board 6 includes a first circuit unit, a second circuit unit, a third circuit unit, and a fourth circuit unit. The first circuit unit is connected to the second circuit unit and the third circuit unit, respectively. The second circuit unit is connected to the third circuit unit and the fourth circuit unit.

[0018] This solution proposes an improved fast charger for lead-acid batteries in electric bicycles. It effectively reduces the heat generation and gas evolution problems of lead-acid batteries during high-current charging, improves charging efficiency, extends the battery's lifespan, and can, to some extent, perform repair charging on lead-acid batteries. Compared to similar products, it adds selling points, improves user experience, and reduces market complaint and return rates.

[0019] In a preferred embodiment of this utility model, the first circuit unit includes a voltage regulating resistor RT1, a varistor RV1, a fuse F1, a rectifier bridge Z1, a capacitor C1, resistors R1A, R1, R3, R3A, R3B, and R3C, a capacitor C06, resistors R2*6, a diode D6, a diode D5, a resistor R11A, a resistor R11, and a capacitor C8; pins one and three of the rectifier bridge Z1 are respectively connected to the varistor RV1 and the voltage regulating resistor. RT1, the voltage regulating resistor RT1 is connected to fuse F1; pins 2 and 4 of rectifier bridge Z1 are connected to capacitor C1, resistor R1A, resistor R1, resistor R3, resistor R3A, resistor R3B and resistor R3C respectively. Pin 2 of rectifier bridge Z1 is also connected to capacitor C06 and resistor R2*6. Capacitor C06 and resistor R2*6 are connected to the third circuit unit through diode D6. Resistor R3C is also connected to capacitor C8 and diode D5 respectively. Diode D5 is also connected to resistor R11A and resistor R11 respectively.

[0020] In a preferred embodiment of this utility model, the second circuit unit includes resistor R4A, diode D4, main MOSFET Q1, resistors R4, R04, R9, R09, capacitor C12, resistor R6, chip IC1, capacitor C10, resistor R8B, resistor RT3, capacitor C11, capacitor C9, chip IC2, resistors R13, R14, RV1, RV2, RV3, capacitor CVA1, resistor RVA6, resistor RLA6, capacitor CLA1, resistor RLA1, resistor RL1, resistor RL5, capacitor CL1, terminal block 1, and capacitor C45; pin 6 of chip IC1 is connected to resistors R4A and R4 respectively, resistor R4A is connected to resistor R04 and main MOSFET Q1 through diode D4, pin 3 of chip IC1 is connected to resistors R09, R9, and capacitor C12 respectively, resistor R09 is also connected to main MOSFET Q1 through resistor R6, and main MOSFET Q1... S-tube Q1 is also connected to the third circuit unit. Pin 4 of chip IC1 is connected to resistor R8B and capacitor C11 respectively. Resistor R8B is connected to resistor RT3. Pin 8 of chip IC1 is connected to capacitor C10. Pin 1 of chip IC1 is connected to capacitor C9 and chip IC2 respectively. Chip IC2 is also connected to resistor R13 and resistor R14 respectively. Resistor R14 is connected to resistor RVA6, resistor RLA6 and pin 11 of terminal block 1 respectively. Resistor RVA6 is connected to capacitor CVA1. Resistor RLA6 is connected to capacitor CLA1. Pin 10 of terminal block 1 is connected to capacitor CVA1, resistor RV1, resistor RV2 and resistor RV3 respectively. Resistor RV1 and resistor RV2 are connected to the third circuit unit and the fourth circuit unit respectively. Pin 12 of terminal block 1 is connected to capacitor CLA1 and resistor RLA1 respectively. Resistor RLA1 is also connected to resistor RL1. Pin 13 of terminal block 1 is connected to resistor RL5. Resistor RL5 is also connected to capacitor CL1. Pins 5 and 6 of terminal block 1 are both connected to capacitor C45.

[0021] In a preferred embodiment of this utility model, the third circuit unit includes a transformer T1, a capacitor C14, a diode D19, a resistor R5*6, a capacitor C7, a resistor R23, a resistor RJ*8, a transistor QP1, a capacitor C20, a resistor RQ2, a resistor RQ3, a diode IC3, a resistor RQ1, a resistor RP2, a resistor RP4, a resistor RP1, a resistor RP3, a capacitor C28, and a diode D18; the sixth and seventh pins of the transformer T1 are respectively connected to capacitor C14, diode D19, and resistor R5*6, and capacitor C14 is also connected to resistor R2. 3. Resistor RJ*8, resistor R5*6 are also connected to capacitor C7. The tenth pin of transformer T1 is connected to capacitor C28, resistor RP1, resistor RP2, resistor RQ1, and one pin of transistor QP1 through diode D18. Resistors RP1 and RP2 are connected to resistors RP3 and RP4 respectively. Resistors RP3 and RP4 are both connected to the fourth circuit unit, resistor RV1, and resistor RV2. The second pin of transistor QP1 is also connected to diode IC3 and resistor RQ1. The three pins of transistor QP1 are connected to resistor RQ2 and capacitor C20 respectively. Resistor RQ2 is also connected to resistor RQ3.

[0022] In a preferred embodiment of this utility model, the fourth circuit unit includes capacitor CRC2, resistor RC2, resistor RC1, diode QF1, transistor QF2, resistor RQF4, resistor RQF3, resistor RQF2, resistor RQF1, capacitor C16, resistor RH1, resistor RH2, resistor RH3, resistor RH5, and capacitor CH1. The three pins of transistor QF2 are respectively connected to resistor RQF1, resistor RQF3, capacitor C16, resistor RP3, and resistor RP34. One pin of transistor QF2 is respectively connected to resistor RH1 and resistor RH2. Resistors RH1 and RH2 are both connected to capacitor CH1, resistor RH3, and resistor RH5. The two pins of transistor QF2 are respectively connected to resistor RQF1, resistor RQF2, resistor RQF3, and resistor RQF4. Resistor RQF4 is connected to capacitor CRC2 and resistor RC2 through diode QF1. Resistor RC2 is connected to resistor RC1.

[0023] The electrical structure adopts a single-ended counter-current type, which, together with PWM control of the main MOS, enables the control of pulse current / voltage in each charging stage.

[0024] This invention provides a fast-charging solution for lead-acid batteries, improving upon the shortcomings of existing chargers on the market. It balances charging speed and battery life, enhancing the user experience. To achieve these effects, this invention uses a pulse-based charging method to suppress side reactions in the electrolyte, reduce gas evolution, and lower battery charging heat. It enables high-current charging, increasing charging speed, and also mitigates the harmful effects of high-current charging on the battery.

[0025] In a preferred embodiment of this utility model, the heat sink structure includes a heat sink 1, a cooling fan 2, a heat dissipation structure 4 at the main MOS, and a plastic tray 8. The plastic tray 8 is installed inside the upper part of the charger's plastic bottom shell 3, and the heat sink 1 is installed above the plastic tray 8. The cooling fan 2 is installed on one side of the heat sink 1 and is located inside the charger's plastic bottom shell 3. A transformer 7 (i.e., Figure 1 Transformer T1), charger circuit board 6 is installed at the bottom of heat sink 1, heat dissipation structure 4 for the main MOSFET is installed on the right side of the bottom of heat sink 1, and main MOSFET 5 (i.e., Figure 1 (Q1 in the text).

[0026] To improve the overall efficiency of the charger, a built-in heat sink has been added, which is different from the traditional charger structure. The heat sink forms a square air duct for the charger's circuit board and electronic components. The heat generated by the electronic components can be quickly drawn out by the fan through the air duct. The cool external air flows towards the electronic components in a concentrated manner, which improves the speed of heat dissipation.

[0027] Meanwhile, by adding heat dissipation fins, the heat dissipation surface area of ​​the radiator increases by 1.5 times, thereby increasing the heat exchange area with the air and further improving the heat dissipation efficiency.

[0028] This charger does not improve the control program; it only protects the hardware structure of the charger. The control program and its electrical components involved are all existing technologies.

[0029] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A pulse fast charger for electric bicycles, characterized in that: The charger includes a charger structure and a heat sink structure. The heat sink structure is installed inside the charger structure. The charger structure includes a charger top cover, a charger circuit board (6), and a charger plastic bottom shell (3). The charger top cover and the charger plastic bottom shell (3) form the shell structure of the charger structure. The heat sink structure and the charger circuit board (6) are installed inside the shell structure. The charger circuit board (6) includes a first circuit unit, a second circuit unit, a third circuit unit, and a fourth circuit unit. The first circuit unit is connected to the second circuit unit and the third circuit unit, respectively. The second circuit unit is connected to the third circuit unit and the fourth circuit unit.

2. The pulse fast charger for electric bicycles according to claim 1, characterized in that: The first circuit unit includes a voltage-regulating resistor RT1, a varistor RV1, a fuse F1, a rectifier bridge Z1, a capacitor C1, resistors R1A, R1, R3, R3A, R3B, and R3C, a capacitor C06, resistors R2*6, a diode D6, a diode D5, a resistor R11A, a resistor R11, and a capacitor C8; pins one and three of the rectifier bridge Z1 are respectively connected to the varistor RV1 and the voltage-regulating resistor RT1. RT1 is connected to fuse F1; pins 2 and 4 of rectifier bridge Z1 are connected to capacitor C1, resistor R1A, resistor R1, resistor R3, resistor R3A, resistor R3B, and resistor R3C respectively. Pin 2 of rectifier bridge Z1 is also connected to capacitor C06 and resistor R2*6. Capacitor C06 and resistor R2*6 are connected to the third circuit unit through diode D6. Resistor R3C is also connected to capacitor C8 and diode D5 respectively. Diode D5 is also connected to resistor R11A and resistor R11 respectively.

3. The pulse fast charger for electric bicycles according to claim 1, characterized in that: The second circuit unit includes resistor R4A, diode D4, main MOSFET Q1, resistors R4, R04, R9, R09, capacitor C12, resistor R6, chip IC1, capacitor C10, resistor R8B, resistor RT3, capacitor C11, capacitor C9, chip IC2, resistors R13, R14, RV1, RV2, RV3, capacitor CVA1, RVA6, RLA6, capacitor CLA1, RLA1, RL1, RL5, capacitor CL1, terminal block 1, and capacitor C45. Pin 6 of chip IC1 is connected to resistors R4A and R4. Resistor R4A is connected to resistor R04 and main MOSFET Q1 via diode D4. Pin 3 of chip IC1 is connected to resistors R09, R9, and capacitor C12. Resistor R09 is also connected to main MOSFET Q1 via resistor R6. Main MOSFET Q1 is also connected to the third... In the circuit unit, pin 4 of chip IC1 is connected to resistor R8B and capacitor C11 respectively. Resistor R8B is connected to resistor RT3. Pin 8 of chip IC1 is connected to capacitor C10. Pin 1 of chip IC1 is connected to capacitor C9 and chip IC2 respectively. Chip IC2 is also connected to resistors R13 and R14 respectively. Resistor R14 is connected to resistors RVA6 and RLA6 respectively. Pin 11 of terminal board 1 is connected to capacitor CVA1 and capacitor CLA1 respectively. Pin 10 of terminal board 1 is connected to capacitor CVA1, resistor RV1, resistor RV2, and resistor RV3 respectively. Resistors RV1 and RV2 are connected to the third and fourth circuit units respectively. Pin 12 of terminal board 1 is connected to capacitor CLA1 and resistor RLA1 respectively. Resistor RLA1 is also connected to resistor RL1. Pin 13 of terminal board 1 is connected to resistor RL5. Resistor RL5 is also connected to capacitor CL1. Pins 5 and 6 of terminal board 1 are both connected to capacitor C45.

4. A pulse fast charger for electric bicycles according to claim 3, characterized in that: The third circuit unit includes a transformer T1, a capacitor C14, a diode D19, resistors R5*6, a capacitor C7, a resistor R23, a resistor RJ*8, a transistor QP1, a capacitor C20, a resistor RQ2, a resistor RQ3, a diode IC3, a resistor RQ1, a resistor RP2, a resistor RP4, a resistor RP1, a resistor RP3, a capacitor C28, and a diode D18. The sixth and seventh pins of the transformer T1 are connected to capacitor C14, diode D19, and resistor R5*6, respectively. Capacitor C14 is also connected to resistor R23 and resistor RJ*8. Resistor R5*6 is also connected to capacitor C7. The tenth pin of transformer T1 is connected to capacitor C28, resistor RP1, resistor RP2, resistor RQ1, and one pin of transistor QP1 via diode D18. Resistors RP1 and RP2 are connected to resistors RP3 and RP4 respectively. Resistors RP3 and RP4 are both connected to the fourth circuit unit, resistor RV1, and resistor RV2. The second pin of transistor QP1 is also connected to diode IC3 and resistor RQ1. The three pins of transistor QP1 are connected to resistor RQ2 and capacitor C20 respectively. Resistor RQ2 is also connected to resistor RQ3.

5. A pulse fast charger for electric bicycles according to claim 4, characterized in that: The fourth circuit unit includes capacitor CRC2, resistor RC2, resistor RC1, diode QF1, transistor QF2, resistor RQF4, resistor RQF3, resistor RQF2, resistor RQF1, capacitor C16, resistor RH1, resistor RH2, resistor RH3, resistor RH5, and capacitor CH1. The three pins of transistor QF2 are connected to resistors RQF1, RQF3, capacitor C16, resistor RP3, and resistor RP34, respectively. One pin of transistor QF2 is connected to resistors RH1 and RH2, respectively. Resistors RH1 and RH2 are both connected to capacitors CH1, RH3, and RH5, respectively. The two pins of transistor QF2 are connected to resistors RQF1, RQF2, RQF3, and RQF4, respectively. Resistor RQF4 is connected to capacitor CRC2 and resistor RC2 through diode QF1, and resistor RC2 is connected to resistor RC1.

6. A pulse fast charger for electric bicycles according to claim 1, characterized in that: The heat sink structure includes a heat sink (1), a cooling fan (2), a heat dissipation structure (4) at the main MOS, and a plastic tray (8). The plastic tray (8) is installed inside the upper part of the plastic bottom shell (3) of the charger. The heat sink (1) is installed above the plastic tray (8). The cooling fan (2) is installed on one side of the heat sink (1). The cooling fan (2) is located inside the plastic bottom shell (3) of the charger. The transformer (7) is installed on the left side of the bottom of the heat sink (1). The charger circuit board (6) is installed at the bottom of the heat sink (1). The heat dissipation structure (4) at the main MOS is installed on the right side of the bottom of the heat sink (1). The main MOS transistor (5) is installed on one side of the heat dissipation structure (4) at the main MOS.

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