Two-way control booster circuit

Abstract

The utility model discloses a two-way control booster circuit, which comprises an adjustable parallel voltage stabilizer U7, a first pin of the adjustable parallel voltage stabilizer U7 is respectively connected with a resistor R1, a resistor R2 and a resistor R3, one end of the resistor R3 is connected with a collector electrode of a triode Q14, and a base electrode of the triode Q14 is connected with a resistor R111 and a V-58V port; the emitter electrode of the triode Q14 is further connected with a triode Q15, the base electrode of the triode Q15 is connected with a resistor R113, the resistor R113 is connected with a pin 7 of a comparator U8B, and only when the triode Q14 and the triode Q15 are conducted at the same time, the resistor R3 and the resistor R2 are connected in parallel to enable output voltage to rise to charge a battery. And if the single chip fails or the battery pack is not inserted into the charger, the voltage of the charger cannot be increased, so that the damage of the battery pack and the hidden danger of personal safety caused by single failure can be well prevented.

Description

Technical Field

[0001] This utility model relates to the field of switching power supply technology, specifically a dual-channel control boost circuit. Background Technology

[0002] Switching power supplies utilize modern power electronics technology to control the duty cycle of switching transistors to maintain a stable output voltage. They offer advantages such as small size, light weight, and high conversion efficiency, and are widely used in various fields. However, in practical use, failure of the charger components can damage the power supply, potentially leading to damage to the battery pack and even posing a safety hazard.

[0003] Currently, garden tools and power tools on the market are becoming increasingly powerful, and the motor voltages used are also increasing. Correspondingly, the number of batteries connected in series is increasing, leading to even higher battery voltages. Since chargers outputting DC voltages exceeding 42V pose a safety hazard to humans, it is essential to control the charger's output voltage below a safe level during standby. This requires adding voltage control to the circuit. To mitigate the potential hazards caused by voltage spikes due to a single circuit failure, a dual-path control boost circuit is proposed. Summary of the Invention

[0004] The purpose of this invention is to provide a dual-channel control boost circuit to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a dual-channel control boost circuit, including an adjustable parallel regulator U7, wherein pin 1 of the adjustable parallel regulator U7 is connected to resistors R1, R2 and R3 respectively, one end of resistor R3 is connected to the collector of transistor Q14, and the base of transistor Q14 is connected to resistor R111 and connected to a V-58V port;

[0006] The emitter of transistor Q14 is also connected to transistor Q15. The base of transistor Q15 is connected to resistor R113. Pin 7 of comparator U8B is connected to resistor R113. Pin 5 of comparator U8B is connected to resistor R86 and then to the P+ port. Pin 6 of comparator U8B is connected to resistor R85 and then to the +5V port.

[0007] Preferably, pin 5 of the comparator U8B is also connected to a resistor R82, a capacitor C31, and a Zener diode ZD8 and grounded.

[0008] Preferably, pin 6 of the comparator U8B is also connected to a resistor R83 and grounded.

[0009] Preferably, the 8th pin of the comparator U8B is connected to a capacitor C27 and a resistor R84, and the 4th pin of the comparator U8B is grounded.

[0010] Preferably, a resistor R114 is connected between the emitter and base of the transistor Q15, and a resistor R112 is connected between the emitter and base of the transistor Q14.

[0011] Preferably, a capacitor C28 and a resistor R99 are connected between pins 1 and 2 of the adjustable parallel voltage regulator U7.

[0012] Compared with the prior art, the beneficial effects of this utility model are: only when transistors Q14 and Q15 are simultaneously turned on, the parallel connection of resistors R3 and R2 increases the output voltage to charge the battery. If a single transistor fails or the battery pack is not plugged into the charger, the charger voltage will not increase. This effectively prevents damage to the battery pack and potential safety hazards caused by a single failure. Attached Figure Description

[0013] Figure 1 This is the circuit schematic diagram of this utility model. Detailed Implementation

[0014] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0015] Please see Figure 1 This utility model provides a technical solution: a dual-channel control boost circuit, including an adjustable parallel regulator U7. The adjustable parallel regulator U7 uses a TL431 and provides a reference voltage of 2.495V. A capacitor C28 and a resistor R99 are connected between pins 1 and 2 of the adjustable parallel regulator U7. Pin 1 of the adjustable parallel regulator U7 is also connected to resistors R1, R2 and R3 respectively. The standby no-load voltage can be determined by the resistance values ​​of resistors R1 and R2. One end of resistor R3 is connected to the collector of transistor Q14. The base of transistor Q14 is connected to resistor R111 and connected to a V-58V port. A resistor R112 is connected between the emitter and base of transistor Q14.

[0016] The emitter of transistor Q14 is connected to transistor Q15. A resistor R114 connects the emitter and base of transistor Q15. A resistor R113 connects the base of transistor Q15. Pin 7 of comparator U8B (an LM358) is connected to resistor R113. Pin 5 of comparator U8B is connected to resistor R86 and then to the P+ port. Pin 5 of comparator U8B is also connected to resistor R82, capacitor C31, and Zener diode ZD8, and is grounded. Pin 6 of comparator U8B is connected to resistor R85 and then to the +5V port. Pin 6 of comparator U8B is also connected to resistor R83 and then grounded. Pin 8 of comparator U8B is connected to capacitor C27 and resistor R84. Pin 4 of comparator U8B is grounded.

[0017] Operating Principle: The output voltage reference of this circuit is a 2.495V reference voltage provided by an adjustable parallel regulator U7 TL431. The standby no-load voltage can be determined by the resistance values ​​of resistors R1 and R2, calculated using the formula: VoB = (2.495V / R2) * (R1 + R2). In standby mode, transistors Q14 and Q15 are not turned on. When the battery pack is connected to the charger, the microcontroller detects the battery pack status. If there are no abnormalities, the microcontroller outputs a high level to port "V-58V", at which point transistor Q14 conducts. Transistor Q15 only conducts when the battery pack is properly connected to the charger and the battery voltage is normal. The P+ port is connected to the battery voltage, and the comparator U8B compares pins 5 and 6, causing pin 7 to output a high level. Only when transistors Q14 and Q15 are both turned on simultaneously, resistors R3 and R2 in parallel increase the output voltage to charge the battery. If the microcontroller fails or the battery pack is not plugged into the charger, the charger voltage will not increase. This can effectively prevent damage to the battery pack and potential safety hazards caused by a single failure.

[0018] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A dual-channel control boost circuit, comprising an adjustable parallel regulator U7, characterized in that: Pin 1 of the adjustable parallel regulator U7 is connected to resistors R1, R2 and R3 respectively. One end of resistor R3 is connected to the collector of transistor Q14. The base of transistor Q14 is connected to resistor R111 and connected to the V-58V port. The emitter of transistor Q14 is also connected to transistor Q15. The base of transistor Q15 is connected to resistor R113. Pin 7 of comparator U8B is connected to resistor R113. Pin 5 of comparator U8B is connected to resistor R86 and then to the P+ port. Pin 6 of comparator U8B is connected to resistor R85 and then to the +5V port.

2. The dual-channel control boost circuit according to claim 1, characterized in that: Pin 5 of the comparator U8B is also connected to a resistor R82, a capacitor C31, and a Zener diode ZD8, and is grounded.

3. The dual-channel control boost circuit according to claim 1, characterized in that: The comparator U8B has a resistor R83 connected to pin 6 and grounded.

4. The dual-channel control boost circuit according to claim 1, characterized in that: The comparator U8B has a capacitor C27 and a resistor R84 connected to its 8th pin, and a grounded pin 4.

5. The dual-channel control boost circuit according to claim 1, characterized in that: A resistor R114 is connected between the emitter and base of the transistor Q15, and a resistor R112 is connected between the emitter and base of the transistor Q14.

6. The dual-channel control boost circuit according to claim 1, characterized in that: A capacitor C28 and a resistor R99 are connected between pins 1 and 2 of the adjustable parallel voltage regulator U7.

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