Power supply output voltage holding extension circuit

Abstract

The utility model discloses a power supply output voltage maintaining and extending circuit which comprises an AC input module, an EMI filtering module, an input rectification filtering module, a PWM converter module, an output rectification filtering module and a power supply and battery output module which are connected in sequence, the PWM control module is connected to the PWM converter module; the output rectification filtering module is also connected with a battery charging module and is connected to the power supply and battery output module through a control circuit module, and the control circuit module is provided with a battery unit. A battery charging module and a control circuit module are additionally arranged at an output rectifying and filtering module to charge and store power of a battery unit, the battery unit is used for storing electric energy when a power supply normally supplies power, and the battery unit is switched to supply power through the control circuit module after the power supply is cut off; therefore, the power supply can still be provided for more than ten seconds after power failure, so that the industrial computer has enough time to store data.

Description

Technical field:

[0001] The utility model relates to the technical field of switching power supplies, in particular to a circuit for maintaining and extending the output voltage of a power supply. Background technology:

[0002] The importance of industrial computer control system data cannot be underestimated. It permeates every aspect of industrial automation production and plays a vital role in ensuring the stability, efficiency, and safety of the production process. Industrial computers often require power-on hold functionality to preserve data during operation. While conventional power supplies only maintain power for tens of milliseconds after a power outage, industrial power supplies typically require around ten seconds to retain data. Common power hold extension circuits on the market cannot meet these requirements.

[0003] For example, a device and server for extending the output voltage retention time, with Chinese patent publication number CN 219351265 U, discloses a technical solution comprising an energy storage capacitor, an inductor, and a diode. The first end of the energy storage capacitor is connected to the positive electrode of a power supply, and the second end is connected to the negative electrode of the power supply. The first end of the energy storage capacitor is also connected to the first end of the inductor, and the second end of the inductor is connected to the positive electrode of the diode. The negative electrode of the diode outputs the voltage. The device also includes a MOS transistor and a MOS transistor control circuit, wherein the MOS transistor is an N-type MOS transistor. The drain of the MOS transistor is connected to the positive electrode of the diode, the source is grounded, and the gate is connected to the MOS transistor control circuit. When the power supply fails, the MOS transistor control circuit obtains the voltage across the energy storage capacitor and the output voltage at the negative end of the diode, and controls the on / off of the MOS transistor based on the two voltages. However, due to the limited storage capacity of the energy storage capacitor, it is often unable to maintain the power supply requirement for approximately ten seconds.

[0004] In view of this, the inventors propose the following technical solutions. Utility model content:

[0005] The purpose of the utility model is to overcome the deficiencies of the prior art and provide a circuit for maintaining and extending the output voltage of a power supply.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions: a power supply output voltage maintenance extension circuit, comprising: an AC input module, an EMI filter module, an input rectifier filter module, a PWM converter module, an output rectifier filter module and a power supply and battery output module connected in sequence, wherein the output rectifier filter module is connected to a feedback control module and is connected to the PWM converter module via the PWM control module; the output rectifier filter module is also connected to a battery charging module and is connected to the power supply and battery output module via a control circuit module, and the control circuit module is provided with a battery unit.

[0007] Furthermore, in the above technical solution, the control circuit module includes chip U7, chip U8, MOS tube Q3 and MOS tube Q4, wherein pin 2 of chip U7 is connected to pin 2 of chip U8, pin 3 of chip U8 is provided with resistor R41 and resistor R42 and is connected to the positive terminal CH+ of the power supply and battery output module, and pin 1 of chip U8 is connected to MOS tube Q3 and MOS tube Q4.

[0008] Furthermore, in the above technical solution, the battery charging module includes a chip U5. The model of the chip U5 is SC8906, which integrates 4 power tubes and can support an ultra-wide 2.7V to 22V VBUS voltage. Regardless of whether VBUS is higher, lower or equal to the battery voltage, the chip U5 can effectively manage the charging of 2 to 4 batteries.

[0009] Furthermore, in the above technical solution, the feedback control module includes a resistor R18 and a resistor R19 connected in parallel to the output rectifier and filter module, an optocoupler U4 and a diode U3 connected in series to one end of the resistor R18, a resistor R20 connected in parallel to both ends of the optocoupler U4, a capacitor C10 connected between the optocoupler U4 and the resistor R19, a resistor R21 and a capacitor C9 connected in parallel to the capacitor C10, and resistors R22 and R23 connected in parallel to one end of the resistor R19, wherein one end of the resistor R22 and the resistor R23 are grounded, pin 2 of the diode U3 is grounded, pin 3 of the diode U3 is connected to the optocoupler U4, pin 1 of the diode U3 is connected to the resistor R19, and the other end of the optocoupler U4 is connected to pin 2 of the chip U1 in the PWM control module.

[0010] By adopting the above technical solution, the present invention has the following advantages compared to the prior art: By adding a battery charging module and a control circuit module to the output rectifier and filter module, the present invention charges and stores the battery cells. The battery cells store energy when power is normally supplied. When power is cut off, the control circuit module switches power to the battery cells, ensuring that power can be provided for at least ten seconds after the power outage, allowing the industrial computer sufficient time to save data. The battery cells are composed of two to four batteries. Description of the drawings:

[0011] Figure 1 It is the main circuit diagram of the utility model;

[0012] Figure 2 This is a circuit diagram of the battery charging module in the utility model;

[0013] Figure 3 It is a circuit diagram of the control circuit module in the utility model. Specific implementation method:

[0014] The present invention will be further described below with reference to specific embodiments and accompanying drawings.

[0015] See Figures 1 to 3 The figure shows a power supply output voltage maintenance extension circuit, which includes: an AC input module 1, an EMI filter module 2, an input rectifier filter module 3, a PWM converter module 4, an output rectifier filter module 5, and a power supply and battery output module 6, which are connected in sequence. The output rectifier filter module 5 is connected to a feedback control module 7 and is connected to the PWM converter module 4 via a PWM control module 8. The output rectifier filter module 5 is also connected to a battery charging module 9 and is connected to the power supply and battery output module 6 via a control circuit module 10. The control circuit module 10 is equipped with a battery cell. By adding the battery charging module 9 and the control circuit module 10 to the output rectifier filter module 5, the battery cell is charged and stored. The battery cell stores energy when the power supply is normal. When the power supply is disconnected, the control circuit module 10 switches to the battery cell for power supply, ensuring that power can be provided for at least ten seconds after the power outage, allowing the industrial computer to save data. The battery cell consists of two to four batteries.

[0016] The control circuit module 10 includes a chip U7, a chip U8, a MOS transistor Q3, and a MOS transistor Q4, wherein pin 2 of chip U7 is connected to pin 2 of chip U8, pin 3 of chip U8 is provided with resistors R41 and R42 and is connected to the positive terminal CH+ of the power supply and battery output module 6, and pin 1 of chip U8 is connected to MOS transistors Q3 and Q4.

[0017] The battery charging module 9 includes a chip U5. The model of the chip U5 is SC8906. It integrates 4 power tubes and can support an ultra-wide 2.7V to 22V VBUS voltage. Regardless of whether VBUS is higher, lower, or equal to the battery voltage, the chip U5 can effectively manage the charging of two to four batteries. The chip U5 also supports input current limiting, dynamic power management, and fast charging mode detection. The chip U5 supports internal current limiting, overvoltage / undervoltage protection, output short circuit protection, and over-temperature protection, which can ensure that the system can adapt to various abnormal situations and can fully charge the battery to 12.6V to 14.4V.

[0018] The feedback control module 7 includes a resistor R18 and a resistor R19 connected in parallel to the output rectifier and filter module 5, an optocoupler U4 and a diode U3 connected in series to one end of the resistor R18, a resistor R20 connected in parallel to both ends of the optocoupler U4, a capacitor C10 connected between the optocoupler U4 and the resistor R19, a resistor R21 and a capacitor C9 connected in parallel to the capacitor C10, and resistors R22 and R23 connected in parallel to one end of the resistor R19, wherein one end of the resistor R22 and the resistor R23 is grounded, pin 2 of the diode U3 is grounded, pin 3 of the diode U3 is connected to the optocoupler U4, pin 1 of the diode U3 is connected to the resistor R19, and the other end of the optocoupler U4 is connected to pin 2 of the chip U1 in the PWM control module 8.

[0019] To sum up, the principle of the present invention is as follows: chip U7 is an IC that outputs a regulated 5V voltage, which serves as a reference voltage for the second pin of chip U8. The model of chip U8 is HTC393, which is a dual voltage comparator. The third pin of chip U8 is connected to the power supply and the positive terminal CH+ of the battery output module 6 through the pull-up and pull-down resistors R41 and R42. When the AC voltage is supplying normally, the voltage at pin 3 of chip U8 is greater than 5V, and pin 1 of chip U8 outputs a high level to the base G of MOS transistors Q3 and MOS transistors Q4. MOS transistors Q3 and MOS transistors Q4 are P-channel MOS transistors. When base G is high, MOS transistors Q3 and MOS transistors Q4 are cut off, and the voltage at the positive terminal CH+ of the power supply and battery output module 6 passes through diodes D11 and D12 to power the industrial computer. When the AC power is cut off, the voltage at the positive terminal CH+ of the power supply and battery output module 6 drops below 10V, and the voltage at pin 3 of chip U8 is less than 5V. Pin 1 of chip U8 outputs a low level to the base G of MOS transistors Q3 and MOS transistors Q4, turning on MOS transistors Q3 and MOS transistors Q4. The battery cell voltage passes through MOS transistors Q3 and MOS transistors Q4 to power the industrial computer. This ensures that the battery can continuously power the industrial computer when the AC voltage is cut off, ensuring that the industrial computer has sufficient time to save data.

[0020] Of course, the above description is only a specific embodiment of the present invention and is not intended to limit the scope of implementation of the present invention. Any equivalent changes or modifications made based on the structure, features and principles described in the scope of the patent application of the present invention should be included in the scope of the patent application of the present invention.

Claims

1. A power supply output voltage maintenance extension circuit, characterized in that: include: The AC input module (1), the EMI filter module (2), the input rectifier filter module (3), the PWM converter module (4), the output rectifier filter module (5), and the power supply and battery output module (6) are connected in sequence, wherein the output rectifier filter module (5) is connected to a feedback control module (7) and is connected to the PWM converter module (4) via a PWM control module (8); the output rectifier filter module (5) is also connected to a battery charging module (9) and is connected to the power supply and battery output module (6) via a control circuit module (10), and the control circuit module (10) is provided with a battery unit.

2. The power supply output voltage maintaining and extending circuit according to claim 1, characterized in that: The control circuit module (10) includes a chip U7, a chip U8, a MOS transistor Q3, and a MOS transistor Q4, wherein pin 2 of the chip U7 is connected to pin 2 of the chip U8, pin 3 of the chip U8 is provided with a resistor R41 and a resistor R42 and is connected to the positive terminal CH+ of the power supply and battery output module (6), and pin 1 of the chip U8 is connected to the MOS transistor Q3 and the MOS transistor Q4.

3. The power supply output voltage holding extension circuit according to claim 1, characterized in that: The battery charging module (9) includes a chip U5, the model of which is SC8906. Four power tubes are integrated inside the chip, which can support an ultra-wide 2.7V to 22V VBUS voltage. Regardless of whether VBUS is higher than, lower than or equal to the battery voltage, the chip U5 can effectively manage the charging of 2 to 4 batteries.

4. The power supply output voltage holding extension circuit according to claim 1, characterized in that: The feedback control module (7) includes a resistor R18 and a resistor R19 connected in parallel to the output rectifier filter module (5), an optocoupler U4 and a diode U3 connected in series to one end of the resistor R18, a resistor R20 connected in parallel to both ends of the optocoupler U4, a capacitor C10 connected between the optocoupler U4 and the resistor R19, a resistor R21 and a capacitor C9 connected in parallel to the capacitor C10, and resistors R22 and R23 connected in parallel to one end of the resistor R19, wherein one end of the resistor R22 and the resistor R23 is grounded, pin 2 of the diode U3 is grounded, pin 3 of the diode U3 is connected to the optocoupler U4, pin 1 of the diode U3 is connected to the resistor R19, and the other end of the optocoupler U4 is connected to pin 2 of the chip U1 in the PWM control module (8).

Images