CN214850940U

CN214850940U - Direct current booster circuit

Info

Publication number: CN214850940U
Application number: CN202121020670.1U
Authority: CN
Inventors: 曾祥华; 何先泉
Original assignee: Changsha Xiandu Technology Co Ltd
Current assignee: Changsha Xiandu Technology Co Ltd
Priority date: 2021-05-13
Filing date: 2021-05-13
Publication date: 2021-11-23
Anticipated expiration: 2031-05-13

Abstract

The utility model provides a direct current boost circuit, including conversion chip U5, be connected with temperature detect switch between conversion chip U5's input Vin and the enable end EN, still be connected with inductance L1 between input Vin and the power output end SW, it has diode D1 and resistance R2 to establish ties in proper order between power output end SW and the power output regulation end FB, is connected with resistance R1 between power output regulation end FB and the earthing terminal GND. The utility model provides a problem that electronic component device damaged that temperature lag arouses in the electrical power generating system interior direct current boost circuit that prior art exists.

Description

Direct current booster circuit

Technical Field

The utility model relates to a electrical power generating system technical field, concretely relates to direct current boost circuit.

Background

In power supply systems, dc boost circuits are commonly used to convert a low voltage to a high output voltage in a power supply system for use by electronic devices. The existing direct current booster circuit has the problem of narrow boosting range and cannot adapt to the voltage of a power supply BMS (battery management system) in a power supply system.

Along with the increase of the function integration level of the chip, the chip with the direct current boosting function can generate a large amount of heat in the working process, the temperature can be rapidly increased due to the large amount of heat, and the functions and the service life of electronic components such as the chip can be reduced due to a long-time high-temperature environment. Therefore, how to provide over-temperature protection for the direct current booster circuit is a technical problem to be solved at present.

Disclosure of Invention

In order to overcome the defects of the prior art, the utility model provides a direct current booster circuit solves the problem of electronic element damage caused by temperature lag in the direct current booster circuit in the power supply system in the prior art.

The technical scheme of the utility model as follows:

the utility model provides a direct current booster circuit, which comprises a conversion chip, wherein the conversion chip comprises the temperature control device; a temperature control switch is connected between an input end Vin and an enable end EN of the conversion chip, an inductor L1 is also connected between the input end Vin and a power output end SW, a diode D1 and a resistor R2 are sequentially connected in series between the power output end SW and a power output regulation end FB, and a resistor R1 is connected between the power output regulation end FB and a ground end GND; the resistor R2 is a variable resistor, and the target voltage can be output through the proportion between the resistor R1 and the resistor R2; the temperature control switch is used for realizing the voltage output of the switching chip, the inductor L1 plays a role in LC filtering, the output voltage is smoothed after being rectified by the diode D1, and the capacity of driving a load can be increased.

Furthermore, the dc boost circuit further includes a capacitor C2 and a capacitor Cout, one end of the capacitor C2 is connected to ground, the other end is connected between the diode D1 and the resistor R2, one end of the capacitor Cout is connected between the diode D1 and the resistor R2, and the other end is connected to ground; the capacitor C2 plays a role in filtering and reducing high-frequency internal resistance of the power supply, the capacitor Cout is an electrolytic capacitor and plays a role in providing reserve current, and when sudden large current is needed and the transformer is not enough, instantaneous deficiency can be supplemented.

Further, a capacitor C1, a capacitor CIN and a transient diode D3 are sequentially connected in parallel between the input end Vin of the conversion chip U5 and the ground GND, and a diode D2 and a fuse F1 are sequentially connected in series at the input end Vin; the capacitor CIN plays a role in stabilizing the input of power supply voltage, the capacitor C1 is used for decoupling and filtering, the fuse F1 is used for protecting overcurrent and short circuit of the circuit, the diode D2 is used for protecting the reverse connection of the power supply polarity, and the transient diode D3 is used for absorbing input surge voltage.

In the dc boost circuit of the present invention, the power voltage is input through the input terminal Vin of the conversion chip, and the output voltage of the output terminal SW of the conversion chip and the regulated voltage output from the output regulation terminal FB are matched with each other by the external voltage through the resistor R1 and the adjustable resistor R2, so as to output the target voltage; when power supply voltage is input, the fuse F1 provides overcurrent and short-circuit protection for the power supply voltage, the diode D2 provides protection for polarity reversal of the power supply, and the capacitor CIN stabilizes the power supply voltage input; in the process of boosting the input voltage, the output voltage of the output end SW is higher than the input voltage of the input end Vin through a boosting chopper circuit in the conversion chip; when the voltage is output, the inductor L1 enables the output voltage to be smoothed after being rectified by the diode D1, the capacitor Cout stores partial current, and the capacitor C2 is connected in parallel to the output end to filter the output voltage, so that the output is smooth and stable, the interference is reduced, and the performance is more stable.

Because the conversion chip can generate a large amount of heat in the working process, when the internal temperature of the power supply system is overhigh, the temperature control switch detects the temperature rise and sends a turn-off signal to the conversion chip, the conversion chip cuts off the voltage output, and when the temperature of the conversion chip is recovered to be normal, the conversion chip recovers the voltage output again; therefore the utility model discloses a temperature detect switch is connected to the enable end at conversion chip to control opening and closing of direct current boost circuit, the inside components and parts of protection electrical power generating system are not burnt out, prolong its life.

The utility model has the advantages that:

1. the direct current booster circuit of the utility model can realize the voltage conversion of a power supply system through the conversion chip internally provided with the boost chopper circuit, and has small ripple and high conversion efficiency; through a voltage division circuit consisting of the resistor R1 and the adjustable resistor R2, the external voltage proportion can be carried out on the output voltage of the conversion chip, and therefore the target voltage is output.

2. Direct current boost circuit, can realize overflowing and short-circuit protection to input voltage to and realize the excess temperature protection to inside electronic components of power supply system such as conversion chip.

3. Direct current boost circuit, can realize super wide input/output voltage, its input voltage range 4V ~32V, voltage output range 5V ~35V satisfies the voltage demand that power BMS can work in the power supply system comprehensively, has solved current direct current boost circuit and has had the narrower problem of range of stepping up.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification. In the drawings:

fig. 1 is a schematic structural diagram of a dc boost circuit according to an embodiment of the present invention.

Detailed Description

The embodiments of the invention will be described in detail below with reference to the drawings, but the invention can be implemented in many different ways as defined and covered by the claims.

As shown in fig. 1, an embodiment of the present invention provides a dc boost circuit, including a conversion chip U5, a temperature control switch is connected between an input end Vin of the conversion chip U5 and an enable end EN, an inductor L1 is further connected between the input end Vin and a power output end SW, a diode D1 and a resistor R2 are sequentially connected in series between the power output end SW and a power output regulation end FB, and a resistor R1 is connected between the power output regulation end FB and a ground end GND; the capacitor C1, the capacitor CIN and the transient diode D3 are connected in parallel between the input end Vin of the conversion chip U5 and the ground GND in sequence, and the diode D2 and the fuse F1 are also connected in series in sequence at the input end Vin.

The direct current booster circuit further comprises a capacitor C2 and a capacitor Cout, one end of the capacitor C2 is connected with the ground, the other end of the capacitor C2 is connected between the diode D1 and the resistor R2, one end of the capacitor Cout is connected between the diode D1 and the resistor R2, and the other end of the capacitor Cout is connected with the ground.

In the embodiment, the voltage conversion of the power supply system can be realized through the conversion chip internally provided with the boost chopper circuit and the voltage division circuit consisting of the resistor R1 and the adjustable resistor R2, the ripple is small, the conversion efficiency is high, and the external voltage proportion can be performed on the output voltage of the conversion chip, so that the output of the target voltage is realized; meanwhile, overcurrent and short-circuit protection of input voltage can be realized through the temperature control switch, and overtemperature protection of electronic components in a power supply system such as a conversion chip is realized.

Claims

1. A DC booster circuit comprises a conversion chip U5, and is characterized in that,

a temperature control switch is connected between the input end Vin and the enable end EN of the conversion chip U5, an inductor L1 is connected between the input end Vin and the power output end SW, a diode D1 and a resistor R2 are sequentially connected in series between the power output end SW and the power output regulation end FB, and a resistor R1 is connected between the power output regulation end FB and the ground end GND.

2. The dc boost circuit of claim 1, further comprising a capacitor C2 and a capacitor Cout, wherein one end of the capacitor C2 is connected to ground, the other end is connected between the diode D1 and the resistor R2, one end of the capacitor Cout is connected between the diode D1 and the resistor R2, and the other end is connected to ground.

3. The DC boost circuit according to claim 1, wherein a capacitor C1, a capacitor CIN and a transient diode D3 are connected in parallel between the input terminal Vin of the conversion chip U5 and the ground terminal GND, and a diode D2 and a fuse F1 are connected in series at the input terminal Vin.