CN213959952U

CN213959952U - Soft start circuit of power battery

Info

Publication number: CN213959952U
Application number: CN202022673434.1U
Authority: CN
Inventors: 常伯仪
Original assignee: Tianjin Lishen Special Power Technology Co ltd
Current assignee: Tianjin Lantian Special Power Technology Co ltd
Priority date: 2020-11-18
Filing date: 2020-11-18
Publication date: 2021-08-13
Anticipated expiration: 2030-11-18

Abstract

The utility model relates to a power battery's soft start circuit, characterized by: the device comprises two groups of control system auxiliary power supplies, a time base integrated circuit, a PNP type triode, an NPN type triode, a driving optocoupler and a field effect transistor. The first time base integrated circuit, the second time base integrated circuit, the PNP type triode and the NPN type triode jointly form a PWM pulse width adjusting circuit, and a pulse signal generated by the PWM pulse width adjusting circuit is connected with the main control loop. The output of the second time-base integrated circuit is connected with the driving optical coupler, an output signal of the driving optical coupler drives the field effect transistor through the auxiliary power supply, high-voltage direct current output is chopped and output to the load end, and the average value of the voltage of the load end is gradually increased to a rated value from 0V to achieve the aim of soft start. Has the advantages that: the utility model discloses a PWM circuit that NE555 time base circuit constitutes soft start circuit, effectively reduces instantaneous consumption. The control voltage is stabilized.

Description

Soft start circuit of power battery

Technical Field

The utility model belongs to the technical field of power battery, especially, relate to a power battery's soft start circuit.

Background

Currently, most power batteries in the power battery industry adopt a pre-charging resistor mode (see fig. 3 in detail) for capacitive loads, the pre-charging resistor is connected in series in a loop to charge the voltage of a load capacitor to be close to the voltage of the battery, and then the pre-charging resistor is cut off by a contactor. During the charging process, a large power consumption is generated, resulting in a loss of part of the energy of the battery. The pre-charging resistor has the problems of low efficiency, high heat emission, large energy loss, large volume, inconvenience in installation and the like.

SUMMERY OF THE UTILITY MODEL

The utility model relates to an overcome not enough among the prior art, provide a power battery's soft start circuit, solve high power battery and strike the high current that capacitive load circuit produced in the twinkling of an eye starting, cancel the pre-charge circuit, reduce the loss energy saving.

The utility model discloses a realize above-mentioned purpose, realize through following technical scheme: a soft start circuit of a power battery is characterized in that: the high-voltage direct current soft start system comprises two groups of auxiliary power supplies of a control system DC1 and a DC2, a first time base integrated circuit, a second time base integrated circuit, a PNP type triode, an NPN type triode, a driving optocoupler and a field effect transistor, wherein the first time base integrated circuit, the second time base integrated circuit, the NPN type triode and the PNP type triode jointly form a PWM pulse width adjusting circuit, PWM pulse width adjusting signals are connected with a main loop of the control system through a pulse signal generating circuit, the second time base integrated circuit is connected with the driving optocoupler and plays a role in isolating with a high-voltage main circuit, output signals of the driving optocoupler are used for driving the field effect transistor through the auxiliary power supply DC2 to chop high-voltage direct current output and output the high-voltage direct current output to a load end, and the average value of the voltage of the load end is gradually increased to a rated value from 0V to achieve the purpose of soft start.

The pulse signal generating circuit mainly comprises a basic clock oscillating circuit consisting of resistors R1, R2 and R3 of a potentiometer RP1 and a first time base integrated circuit U1, and can generate pulse signals with different frequencies under different resistance values of the potentiometer RP 1.

The duty ratio of the pulse width modulation signal is gradually increased from 0% to 100%.

The type of the driving optocoupler is TLP250, a ceramic capacitor of 0.1u F is connected between pins 8 and 5 of the driving optocoupler, and the internal driving circuit is stabilized to normally work by eliminating circuit coupling.

Has the advantages that: compared with the prior art, the utility model discloses a soft start circuit that electronic components such as PWM circuit, DC-DC, MOSFET drive opto-coupler, resistance that NE555 time base circuit constitutes effectively reduce instantaneous consumption. The traditional pre-charging resistor is replaced, the working efficiency of the battery is improved, the energy is saved, and the reliability of the system is improved. The voltage control is stable, the power consumption is low, the temperature rise is low, the efficiency is high, the size is small, the weight is light, and the application range is wide.

Drawings

Fig. 1 is a schematic circuit diagram of the present invention;

fig. 2 is a block diagram of the present invention connected to a battery system;

fig. 3 is a block diagram of a prior art pre-charge resistor connection.

In the figure: a C1-C5 filter capacitor, a VD1 voltage stabilizing diode, a T1.PNP triode, a T2.NPN triode R1-R9 divider resistor, U1-U2 NE555, U3. drive optocouplers, and a DC1-DC2 DC _ DC conversion module

Detailed Description

The following detailed description of the embodiments according to the present invention with reference to the preferred embodiments is as follows: referring to the drawings in detail, the embodiment provides a soft start circuit of a power battery, which is characterized in that: the high-voltage direct current soft start system comprises two groups of auxiliary power supplies of a control system DC1 and a DC2, a first time base integrated circuit, a second time base integrated circuit, a PNP type triode, an NPN type triode, a driving optocoupler and a field effect transistor, wherein the first time base integrated circuit, the second time base integrated circuit, the NPN type triode and the PNP type triode jointly form a PWM pulse width adjusting circuit, PWM pulse width adjusting signals are connected with a main loop of the control system through a pulse signal generating circuit, the second time base integrated circuit is connected with the driving optocoupler and plays a role in isolating with a high-voltage main circuit, output signals of the driving optocoupler are used for driving the field effect transistor through the auxiliary power supply DC2 to chop high-voltage direct current output and output the high-voltage direct current output to a load end. The pulse signal generating circuit mainly comprises a basic clock oscillating circuit consisting of resistors R1, R2 and R3 of a potentiometer RP1 and a first time base integrated circuit U1, and can generate pulse signals with different frequencies under different resistance values of the potentiometer RP 1. The duty ratio of the pulse width modulation signal is gradually increased from 0% to 100%. The type of the driving optocoupler is TLP250, a ceramic capacitor of 0.1u F is connected between pins 8 and 5 of the driving optocoupler, and the internal driving circuit is stabilized to normally work by eliminating circuit coupling.

The connection relationship of the control system is as follows:

the control system auxiliary power supply DC1 outputs a fixed control voltage of 12V, and provides a stable isolated working power supply for the whole control system. The RP1, R1, R2, R3, U1, C1 and C2 jointly form a fixed clock source circuit with adjustable frequency. The RP1 and the divided voltage values of R1 and R3 are used as the reference input voltage of U1, C2 is circularly charged and discharged through a comparison circuit in the U1, and an oscillation clock source is formed and is output by a third pin U1. The second time base integrated circuit U2 generates a triangular wave on pin 7 using the clock signal formed by the previous stage. After the voltage division of R8 and RP2, a control voltage is applied to pin 5 of U2 through a transistor T2, and the control voltage and a triangular wave formed at a previous stage are converted into a PWM output through a comparison circuit inside U2. The photoelectric coupler is driven through the resistor R7, and after optical coupling isolation, the voltage generated by the output of the system auxiliary power supply DC2 is provided to the grid electrode of the driving field effect transistor T3. Thus the dc supply high voltage of the main circuit is converted to a PWM pulse width modulated signal via T3. The high-voltage direct current output is chopped and then output to a load end, and the duty ratio of the average value of the voltage of the load end is gradually increased from 0% to 100%, so that the purpose of soft start of the load is achieved.

Referring to fig. 2 in detail, the Battery + terminal of the soft start circuit is connected to the positive electrode of the main circuit of the Battery system, and the output terminal OUT of the circuit is connected to the load terminal, so that the high voltage of the main circuit can be limited at the moment of starting, and the impact on the load of the main circuit can be reduced.

Principle of operation

The above detailed description of the soft start circuit of a power battery with reference to the embodiments is illustrative and not restrictive, and several embodiments may be enumerated in accordance with the limitations of the present invention, so that changes and modifications may be made without departing from the spirit and scope of the present invention.

Claims

1. A soft start circuit of a power battery is characterized in that: the high-voltage direct current output is chopped by driving the field effect transistor through the auxiliary power supply DC2, and the high-voltage direct current output is output to a load end, and the average value of the voltage of the load end is gradually increased to a rated value from 0V to achieve the purpose of soft start.

2. The soft start circuit of a power battery as claimed in claim 1, wherein: the pulse signal generating circuit mainly comprises a potentiometer (RP1), a basic clock oscillating circuit consisting of resistors R1, R2 and R3 and a first time base integrated circuit (U1), and can generate pulse signals with different frequencies under different resistance values of the potentiometer (RP 1).

3. The soft start circuit of a power battery as claimed in claim 1, wherein: the type of the driving optocoupler is TLP250, a ceramic capacitor of 0.1u F is connected between pins 8 and 5 of the driving optocoupler, and the internal driving circuit is stabilized to normally work by eliminating circuit coupling.