CN218124330U

CN218124330U - DCDC direct current switching power supply

Info

Publication number: CN218124330U
Application number: CN202220708367.9U
Authority: CN
Inventors: 黄聪聪
Original assignee: Shanxi City Power New Energy Co ltd
Current assignee: Shanxi City Power New Energy Co ltd
Priority date: 2022-03-30
Filing date: 2022-03-30
Publication date: 2022-12-23
Anticipated expiration: 2032-03-30

Abstract

The utility model relates to a DCDC direct current switch power supply, which belongs to the technical field of power supply equipment and specifically comprises a power supply control module, wherein the power supply control module is connected with an output short circuit protection module and an over-temperature protection module, and the power supply control module is also connected with an input under-voltage protection module and an output over-voltage protection module; the utility model discloses simple structure, reasonable in design can effectively prolong battery life.

Description

DCDC direct current switching power supply

Technical Field

The utility model relates to a DCDC direct current switching power supply belongs to power supply unit technical field.

Background

In recent years, with the proposal of carbon neutralization, new energy power generation is rapidly developed as a clean power generation technology, however, the volatility of new energy is obviously contradicted with the safety of a power grid, and the development of stored energy becomes a key for solving the problems of power and energy supply and demand and matching. Electrochemical energy storage in various energy storage technologies becomes the category with the fastest growth and expansion due to the characteristics of less application scene limitation, excellent comprehensive performance and the like. Wherein the domestic energy storage market is also accelerating.

The household energy storage system mainly refers to an energy storage system installed on a residential house, and the operation mode of the household energy storage system comprises independent operation and matched operation with renewable energy power generation equipment such as a small fan, a roof photovoltaic and the like. The method can realize the management of the electric charge, the optimization of the electricity utilization cost, the enhancement of the power supply reliability and the like. Wherein a dc switching power supply is an important module in a household energy storage system. However, the existing direct-current switching power supply is unreasonable in power supply and short in service life of the battery.

SUMMERY OF THE UTILITY MODEL

For solving the technical problem that prior art exists, the utility model provides a simple structure, reasonable in design can effectively prolong battery life's DCDC direct current switching power supply.

In order to achieve the above object, the utility model discloses the technical scheme who adopts is a DCDC direct current switching power supply, including power control module, power control module is last to be connected with output short-circuit protection module and excess temperature protection module, its characterized in that: the power supply control module is also connected with an input under-voltage protection module and an output over-voltage protection module;

the input undervoltage protection module comprises a comparator U21, a comparator U11, a first resistor R27, a second resistor R21, a third resistor R212 and a fourth resistor R213, the negative input end of the comparator U21 is connected with the total battery voltage after resistor voltage division, the positive input end of the comparator U21 is connected with the reference voltage through the second resistor R21, a first capacitor C22 is connected on the second resistor R21 in parallel, the positive input end of the comparator U21 is further connected with the negative electrode of the battery through the first resistor R27, the output end of the comparator U21 is connected with the negative electrode of the battery through the fourth resistor R213 and the second capacitor C23, the output end of the comparator U21 is further connected with the negative input end of the comparator U11), the positive input end of the comparator U11) is further connected with the reference voltage through the second resistor R21, the negative input end of the comparator U11) is further connected with the output end of the second resistor R21 through the third resistor R212, and the output end of the comparator U11) is connected with the power supply control module through a fifth resistor R802.

Preferably, the output overvoltage protection module includes a first triode Q5, an optocoupler U4, a second triode Q4, a first zener diode Q2 and a second zener diode Q3, a base of the first triode Q5 is connected with a pin 3 of the optocoupler U4, an emitter of the first triode Q5 is connected with the power control module, an emitter of the first triode Q5 is connected with a negative electrode of the battery through a sixth resistor R38, the sixth resistor R38 is connected in parallel with the second zener diode Q3, the pin 3 of the optocoupler U4 is further connected with a negative electrode of the battery through a seventh resistor R32, an emitter of the second triode Q4 is connected with the power supply through an eighth resistor R35, a base of the second triode Q4 is connected with a collector of the first triode Q5 through a ninth resistor R34, the power supply is further connected with a node of the base of the ninth resistor R34 and the second triode Q4 through a tenth resistor R36, the pin 3 of the second triode Q4 is further connected with the power supply through an eleventh resistor R37, the pin 3 of the optocoupler U4 is connected with a voltage output terminal of the twelfth zener diode Q2, and a voltage output terminal of the twelfth resistor R30 is connected with a twelfth resistor R30.

Compared with the prior art, the utility model discloses following technological effect has: the utility model can realize continuous power supply to the system under the off-grid condition, and preferentially use the commercial power under the condition of commercial power, thereby reducing the use of the battery and prolonging the service life of the battery; and the system is safer and more reliable to operate.

Drawings

Fig. 1 is the circuit structure schematic diagram of the under-voltage protection module for the middle input of the present invention.

Fig. 2 is a schematic diagram of a circuit structure of the middle over-temperature protection module of the present invention.

Fig. 3 is a schematic diagram of the circuit structure of the middle output overvoltage protection module of the present invention.

Fig. 4 is a schematic diagram of the circuit structure of the middle output short-circuit protection module of the present invention.

Detailed Description

In order to make the technical problem, technical solution and beneficial effects to be solved by the present invention more clearly understood, the following description is made in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

The DCDC direct current switch power supply comprises a power supply control module, wherein an output short-circuit protection module and an over-temperature protection module are connected to the power supply control module, and an input under-voltage protection module and an output over-voltage protection module are further connected to the power supply control module.

As shown in fig. 1, the input under-voltage protection module includes a comparator U21, a comparator U11, a first resistor R27, a second resistor R21, a third resistor R212, and a fourth resistor R213, a negative input end of the comparator U21 is connected to the total battery voltage after the voltage division, a positive input end of the comparator U21 is connected to the reference voltage through the second resistor R21, the second resistor R21 is connected in parallel to a first capacitor C22, a positive input end of the comparator U21 is further connected to a negative electrode of the battery through the first resistor R27, an output end of the comparator U21 is connected to the negative electrode of the battery through the fourth resistor R213 and a second capacitor C23, an output end of the comparator U21 is further connected to a negative input end of the comparator U11), a positive input end of the comparator U11) is further connected to the reference voltage through the second resistor R21, a negative input end of the comparator U11) is further connected to an output end of the second resistor R21 through the third resistor R212, and an output end of the comparator U11) is connected to the power control module through a fifth resistor R802.

The input undervoltage protection module can stop power output when the battery voltage is too low, protect the battery and prolong the service life of the battery. The principle of the function is that the self-carrying function of pin 1 (COM) of UC28C44 is utilized, when the COM pin is pulled down by a peripheral circuit, a control chip seals waves, and a switching MOS tube has no driving signal and stops outputting. The peripheral control circuit adopts a hysteresis comparator mode, can ensure that the undervoltage protection point is inconsistent with the recovery point, and avoids repeatedly starting and stopping near the undervoltage protection point. As shown in fig. 1, the total voltage of the battery is divided by the resistor, and then the total voltage is transmitted to the pin 6 of the U21 and the reference voltage of the pin 5 of the U21 are compared, and the pin 1 of the U21 is in a high-resistance state under the condition that the divided voltage of the pin 6 is greater than the reference voltage of the pin 5, so as to control the normal operation of the chip; when the 6-pin divided voltage is less than the 5-pin reference voltage, the 1 pin of the U11 is pulled low, and at the moment, the control chip has no output in wave sealing.

As shown in fig. 2, the over-temperature protection function can stop the power output after the temperature of the board is higher than the set temperature protection point, thereby protecting the system safety. The principle of the function is that the self-carrying function of pin 1 (COM) of UC28C44 is utilized, when the COM pin is pulled down by a peripheral circuit, a control chip seals waves, a switching MOS tube has no driving signal, and the output is stopped. The peripheral control circuit adopts a hysteresis comparator mode, can ensure that an over-temperature protection point is inconsistent with a recovery point, and avoids repeated starting and stopping near the under-over-temperature protection point. As shown in fig. 2, the NTC resistance value is connected in series with the resistor to divide the voltage, and the temperature value is converted into a voltage value by using the characteristic that the NTC resistance value changes with the temperature, and then the voltage value is converted into a control signal by using the hysteresis comparator, so as to control the level signal of pin 1 (COM) of UC28C44, thereby implementing the over-temperature protection function.

As shown in fig. 3, the output overvoltage protection module includes a first triode Q5, an optocoupler U4, a second triode Q4, a first zener diode Q2 and a second zener diode Q3, a base of the first triode Q5 is connected to a pin 3 of the optocoupler U4, an emitter of the first triode Q5 is connected to the power control module, an emitter of the first triode Q5 is connected to a negative electrode of the battery through a sixth resistor R38, a second zener diode Q3 is connected in parallel to the sixth resistor R38, the pin 3 of the optocoupler U4 is further connected to a negative electrode of the battery through a seventh resistor R32, an emitter of the second triode Q4 is connected to the power supply through an eighth resistor R35, a base of the second triode Q4 is connected to a collector of the first triode Q5 through a ninth resistor R34, the power supply is further connected to a node of the base of the ninth resistor R34 through a tenth resistor R36, the node of the base of the second triode Q4 is connected to the power supply through an eleventh resistor R37, a pin 2 of the optocoupler U4 is connected to a terminal of the optocoupler U4, a twelfth resistor R30 and a voltage output terminal of the twelfth zener diode Q30 is connected to a GND.

The output overvoltage protection module can stop power output after the output voltage exceeds a set voltage value, so that the load is protected to be safe. The principle of the function is that the self-carrying function of 3-pin (ISNS) of UC28C44 is utilized, and when the voltage of 3-pin is higher than 1V, the switching MOS tube has no driving signal and stops outputting. As shown in fig. 3, when the output voltage V _ +20V2 is higher than the breakdown voltage value of the voltage regulator tube Q2, the voltage regulator tube breaks down, a current flows through the front end of the optocoupler, the rear end of the optocoupler is conducted, and then Q5 obtains Ib current and is conducted, and after Q5 is conducted, a current flows through the resistor R38 and generates a voltage drop larger than 1V, so that the control chip stops outputting the MOS tube driving signal, and the power supply stops outputting. Due to the existence of Q4, even if the output voltage is reduced to be lower than the breakdown voltage of the voltage-regulator tube, the power supply still stops outputting, and the power supply is recovered to be normal after manual power-off restarting, so that the fault removal can be confirmed.

As shown in fig. 4, the output short-circuit protection module can stop the output of the power supply after the output load is short-circuited, thereby protecting the system. The principle of the function is that the self-carrying function of 3-pin (ISNS) of UC28C44 is utilized, and when the voltage of 3-pin is higher than 1V, the switch MOS tube has no driving signal and stops outputting. As shown in fig. 4, the primary-side input current is converted into a voltage value after flowing through the precision resistors R225, R226, and R227, the resistance values of R225, R226, and R227 are determined by the maximum output power, when the output power is less than or equal to the maximum output power, the voltage drop of the primary-side input current on the resistors R225, R226, and R227 is less than 1V, the power output is normal, when the output is short-circuited, the primary-side input current is increased, the voltage drop on the resistors R225, R226, and R227 is greater than 1V, and the power supply stops outputting.

The above description is only exemplary of the present invention and should not be construed as limiting the present invention, and any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims

1. The utility model provides a DCDC direct current switching power supply, includes power control module, last output short-circuit protection module and the overtemperature protection module of being connected with of power control module, its characterized in that: the power supply control module is also connected with an input under-voltage protection module and an output over-voltage protection module;

the input undervoltage protection module comprises a comparator (U21), a comparator (U11), a first resistor (R27), a second resistor (R21), a third resistor (R212) and a fourth resistor (R213), the negative input end of the comparator (U21) is connected with the total battery pressure after resistor voltage division, the positive input end of the comparator (U21) is connected with a reference voltage through the second resistor (R21), a first capacitor (C22) is connected in parallel on the second resistor (R21), the positive input end of the comparator (U21) is connected with the negative electrode of the battery through the first resistor (R27), the output end of the comparator (U21) is connected with the negative electrode of the battery through the fourth resistor (R213) and the second capacitor (C23), the output end of the comparator (U21) is connected with the negative input end of the comparator (U11), the positive input end of the comparator (U11) is connected with the reference voltage through the second resistor (R21), the negative input end of the comparator (U11) is connected with the negative input end of the third resistor (R212), and the output end of the comparator (R21) is connected with the output end of the power supply (U11), and the output end of the comparator (U11) is connected with the fifth resistor (R802).

2. The DCDC direct current switching power supply according to claim 1, wherein: the output overvoltage protection module comprises a first triode (Q5), an optocoupler (U4), a second triode (Q4), a first voltage stabilizing diode (Q2) and a second voltage stabilizing diode (Q3), a base of the first triode (Q5) is connected with a pin 3 of the optocoupler (U4), an emitting electrode of the first triode (Q5) is connected with the power control module, an emitting electrode of the first triode (Q5) is connected with a battery negative electrode through a sixth resistor (R38), the sixth resistor (R38) is connected with a second voltage stabilizing diode (Q3) in parallel, the pin 3 of the optocoupler (U4) is further connected with a battery negative electrode through a seventh resistor (R32), an emitting electrode of the second triode (Q4) is connected with the power supply through an eighth resistor (R35), a base of the second triode (Q4) is connected with a collecting electrode of the first triode (Q5) through a ninth resistor (R34), the power supply is further connected with a thirteenth resistor (R36) and a base of the twelfth resistor (R34), a base of the second triode (Q4) is connected with a base of the twelfth resistor (R30), and a voltage output end of the twelfth resistor (R3) is connected with a base of the twelfth resistor (R30, and a base of the twelfth resistor (R4) is connected with a base of the power supply terminal of the twelfth resistor (R30, and a base of the twelfth resistor (R4) is connected with a base of the twelfth resistor (R30, and a base of the twelfth resistor (R2) is connected with a base of the output terminal of the twelfth resistor (R30, and a twelfth resistor (R4) is connected with a twelfth resistor (R30, and a resistor (R2) is connected with a resistor (R30, and a resistor (R4) is connected with a resistor (R2).