RU221961U1 - UNIVERSAL POWER SUPPLY WITH STORAGE FOR OPERATING CURRENT SOURCE WITH VOLTAGE 110 OR 230 V - Google Patents

Abstract

The utility model relates to electrical engineering, in particular to uninterruptible power supplies in a DC network. The technical result, which the utility model proposed for protection is aimed at achieving, is to increase the stability of the standardized emergency operation time of electrical equipment from a DC network with a voltage of 88...242 V. The specified technical result is achieved by the fact that a universal power supply with a storage device for an operational current source with voltage 110 or 230 V, including a power input module, a capacitor module connected to the switching module, a control module, a power output module connected to the load module, contains a line filter installed in the power input module, as well as a voltage boosting and stabilizing module connected to control module, which includes a comparator powered from a reference voltage source. The switch module includes first, second and third switch modules. The second and third switch modules are connected to a comparator and a voltage increase and stabilization module, which is also connected in parallel to the first switch module, which, in turn, is connected to a control unit that, together with the power output module, implements the functions of a switching power supply. 2 ill.

Description

The claimed utility model relates to electrical engineering, in particular to uninterruptible power supplies in a DC network, and can be used to solve problems associated with stability of operation under network power conditions with voltage fluctuations from 85 to 264V.

Power supplies (PSUs) are electrical devices that change the characteristics of industrial electricity to the level of parameters necessary for the operation of the final equipment.

In switching power supplies (UPS), electricity conversion is performed not at industrial 50 Hz, but at higher signals within 1÷100 kHz.

To increase the reliability of power supply, reduce power losses, and also reduce damage in the form of interruptions in power supply, energy storage devices are used, thanks to which a number of problems are solved, such as voltage dips and surges, uneven electrical load schedules, including load fluctuations, frequency deviations, low reliability and stability of power transmission.

There is a wide range of uninterruptible power supplies that can maintain power for some time after a power failure in the primary network, which avoids damage to the end equipment and, accordingly, prevents a decrease in its reliability.

Electric energy storage devices (EE) are a backup autonomous power source and, in general, can replace the main power source when the latter fails.

The main types of electrical energy storage devices (EE) include: flywheels; capacitors; supercapacitors; superconducting inductive storage devices (SPINE) and high-power batteries (Efremov D.G. Research into the possibility and development of methods for using energy storage devices of various types for emergency control during large disturbances in the power system: thesis. Candidate of Technical Sciences: protected 2018 / Efremov Dmitry Gennadievich . - M., 2018. - 146 p.).

The most effective type of NE used to reduce the duration and magnitude of voltage dips and surges are capacitors, which can withstand an almost unlimited number of charge-discharge cycles. Capacitors have an efficiency close to 100%. An important factor is the safety of capacitors during operation, because they do not contain substances harmful to the environment.

There are two ways to supply power to the load during a failure in the external power grid. The first is to increase the energy reserve at the output by using large-capacity storage capacitors in the output filter, and the second is to increase the energy reserve in the primary power source.

From the prior art there is known a device (circuit) for holding when the power is turned off, a power supply circuit and electrical equipment, including supercapacitors, a voltage conversion unit (U1), an energy storage unit (C4, C5) and an interconnected first block of switches (D1) and a second block switches (D2) (CN 217406238 “Power failure holding circuit, power supply circuit and electric equipment”, 2022-09-09).

The disadvantages of this technical solution are related to the fact that an increase in the energy reserve at the output is realized by charging high-capacity storage capacitors (supercapacitors) from the low-voltage output voltage of the voltage conversion unit. In addition, in the event of a voltage drop across the second switch bank, the supercapacitor voltage reaching the protected circuit at the time of the failure is reduced, which in turn leads to instability of the low-voltage load, such as a microprocessor, for example.

The closest technical solution to the claimed utility model is a device - a power supply circuit for electrical equipment, containing

power supply module designed to convert external network voltage;

a capacitor module connected to the power input module and charged from the first power supply;

a switch module coupled to the capacitor module and providing a second power source by utilizing a discharge of the capacitor module during a period when the switch module is in a conducting state;

a control module connected to the power input module and the switching module and used to output a first signal to the switching module when an external power input is detected;

a power output module connected to the power input module, the switch module, the control module and the load, and supplying power to the control module and the load using the first or second power supply;

wherein the power supply module also serves to output a second signal to the switch module when the external power supply input is not detected and the power supply signal is detected;

in this case, the first signal is used to control the switch module in the off state, and the second signal is used to control the switch module in the on state (CN 115051462 “Power supply circuit and electric equipment”, 2022-09-13).

The disadvantages of the closest analogue are due to the fact that if it is used in networks of external sources with a wide range of voltages, guaranteed emergency power supply to the equipment cannot be provided.

In addition, known solutions in the event of a power failure in the network do not ensure compliance with the requirements for stability of operation under power supply conditions in a network with voltage fluctuations from 85 to 264 V. When implementing the invention, the equipment becomes more energy-intensive.

The technical result that the utility model proposed for protection is aimed at achieving is increasing the stability of the standardized emergency operation time of electrical equipment from a DC network with a voltage of 88...242 V.

The specified technical result is achieved by the fact that a universal power supply with storage for an operating current source with a voltage of 110 or 230 V, including a power supply input module, a capacitor module connected to a switching module, a control module, a power output module connected to a load module, according to the utility model , contains a network filter installed in the power supply input module, as well as a voltage boosting and stabilizing module connected to a control module, which includes a comparator powered from a reference voltage source, wherein the switching module includes modules of the first, second and third switches, and the modules of the second and third switches are connected to a comparator and a module for increasing and stabilizing the voltage, which is also connected in parallel to the module of the first switch, which, in turn, is connected to a control unit that, together with the power output module, implements the functions of a switching power supply.

The utility model is illustrated by drawings, where:

Fig. 1 - block diagram of a universal power supply with storage for an operating current source with a voltage of 110 or 230 V.

Fig. 2 - functional diagram of a universal power supply with storage for an operating current source with a voltage of 110 or 230 V.

The inventive device contains a power supply input module 1; a switch module containing a first switch module 2, a second switch module 3, a third switch module 7; voltage increase and stabilization module 4; capacitor module 5; control module 6; power output module 8 and load module 9.

Power input module 1 consists of an external voltage source G and a line filter Z connected in series with it. The power input module is used to convert the external network voltage into a power source.

The rectifier VD2 in the form of a storage bypass diode is used as the module of the first switch 2, and the keys SA1 and SA2 are used as the modules of the second and third switches, respectively.

Capacitor C1 was used as a capacitor module.

Voltage boosting and stabilization module 4 together with capacitor module 5 (C1) form a step-up stabilizer with an output voltage of 250 V, while a step-up voltage converter PN1 is used as a voltage boosting and stabilization module.

Power output module 8 contains a wide-pulse modulator PN2, a diode VD3 and a capacitor C2.

The first, second and third switch modules 2, 3, 7, a voltage boosting and stabilizing module 4, a capacitor module 5, and a power output module 8 conventionally form a switching power supply with an output voltage of 24 V.

Control module 6 is conventionally formed by a zener diode VD1, a comparator DA1 and an inverter DA2.

Load module 9 is a “Load” resistor.

The power output module 8 generates a stabilized DC voltage at the load 9 from the mains voltage.

Power input module 1 is connected through line filter Z to the first switch module VD2, and also through the second switch module SA1 to voltage boost and stabilization module 4 in the form of a boost converter PN1. The mains filter passes an industrial sinusoid through itself and at the same time separates from it all extraneous interference in the form of electrical noise - random changes in electric current that degrade the quality of the signal, and turns the resulting harmonic into a voltage signal of a strictly constant form of effective quantity.

The boost converter PN1 and rectifier VD2 are connected in parallel, due to which, as well as connecting these elements to the same power source, the discharge time of capacitor C1 increases. The VD2 rectifier in the form of a storage bypass diode is capable of closing and opening circuits, switching electrical signals, and also allowing current to flow in one direction and blocking the flow of current in the opposite direction.

The boost converter PN1, connected to the second and third switch modules - keys SA1 and SA2, provides increased voltage for the operation of the comparator DA1, which is part of the control unit and located between the line filter Z and the boost converter PN1. The comparator is connected to the reference voltage source VD1 - a basic electronic unit that maintains a highly stable constant electrical voltage at its output. The comparator receives two analog signals at its inputs and produces a high-level signal if the signal at the non-inverting input (“+”) is greater than the inverting (inverse) input (“-”), and a low-level signal if the signal at the non-inverting input is less , than at the inverse input, i.e. The comparator compares the voltage with a reference voltage to generate feedback signals. The comparator communicates between continuous voltage signals and the logical variables of a digital device. The comparator makes it possible to operate the switch modules SA1 and SA2.

The first switch module VD2 is connected to and supplies voltage to the power supply 1 and the power output module 8. Closed in normal mode.

The second switch module SA1, through a surge protector Z, is connected to the power source G and the voltage boosting and stabilizing module 4, and supplies voltage from the power supply 1 to the voltage boosting and stabilizing module 4. In normal mode, it is closed.

Voltage increase and stabilization module 4 is connected to capacitor module 5. In normal operation, it charges capacitor C1 to a voltage of 250 V.

The capacitor module 5 in emergency power supply mode provides power to the power output module 8.

The third switch module SA2 is connected to the capacitor module 5 and the power output module 8. In normal operation, it is open.

The control module 6, connected to the power supply G and the second and third switch modules, controls the voltage of the power supply, generates control signals for the power supply input modules and said switch modules.

In emergency mode, in the absence of voltage from the power source, control module 6 during the discharge time of capacitor C1 to a value of 88 V provides the ability to maintain voltage on load 9.

The operating principle of a universal uninterruptible power supply is based on providing continuous power supply during short-term voltage dips in the external network. In the inventive device, regardless of the voltage in the external network, energy storage devices - capacitors are charged to a value of 250 V and, therefore, the time the power output module 8 holds the voltage on the load 9 after the moment of power failure in the network no longer depends on the voltage in the external network, which was before the start of an emergency.

The utility model is implemented as follows.

The voltage of power supply module 1 is compared by comparator DA1 with the reference voltage of zener diode VD1.

While the load is normally powered from power source 1, mains voltage G 88-242 V is supplied to the drive bypass diode VD2 and then to the power output module, namely to the input of the pulse-width converter PN2, which, together with diode VD3 and capacitor C2, implements the functions of a pulse source power supply with an output voltage of 24V. Simultaneously with the formation of the output voltage, capacitor C1 is charged by the output current of the step-up converter PN1 to a voltage of 250 V.

If the voltage of power supply module 1 exceeds 88V, then comparator DA1 closes key SA1 with control signals and opens switch SA2. The voltage from the power source through switch SA1 is supplied to the step-up voltage stabilizer PN1, which starts, charges, and then maintains a voltage of 250 V on capacitor C1. At the same time, the sinusoid cleared of interference is supplied to the rectifier VD2 - a capacitor bypass diode, which converts the resulting harmonic into a voltage signal of a strictly constant form of effective value. The bypass diode allows you to eliminate or at least reduce the dependence on the quality of AC networks. Then the voltage is supplied to the power output module 8, where, using a pulse-width converter PN2, a diode VD3 and a capacitor C2, it is converted into a stabilized constant output voltage, which, due to the formation of high-frequency oscillations, is no longer sinusoidal, but almost strictly rectangular. The electrical energy converted in this way is supplied to the load module 9, in which, using the “Load” resistor, the DC voltage is reduced to 24V, and then, passing through the output rectifier (not shown in the drawing) to the control unit of the final equipment, for example, a household appliance or office equipment, a stabilized constant voltage is supplied.

In the event of a power failure in the G network and the voltage at the input of the comparator DA1 drops below the specified value of 88 V, the switch SA2 is switched on, which ensures the closure of the circuit. To turn on the key, a fairly large power of the control signal is required, created using a boost converter PN1. After closing the circuit, the voltage accumulated on capacitor C1 is supplied to the input of the power output module, ensuring continuation of continuous power supply for a regulated time.

The advantages of the operation of the proposed universal pulse unit lie in the creation of feedback in the operating state, implemented in the control module and compensating for all voltage drops and surges caused by fluctuations in the input value or load switching. In this case, the capacitor, regardless of the voltage in the external power supply network, is charged to the same value of 250 V and, therefore, the time the power output module holds the voltage on the load after the moment of voltage loss in the external network is always stable and does not depend on the voltage that was in the network before the accident.

Claims (1)

A universal power supply with storage for an operating current source with a voltage of 110 or 230 V, including a power supply input module, a capacitor module connected to a switching module, a control module, a power output module connected to a load module, characterized in that it contains a line filter installed in power input module, as well as a voltage boosting and stabilizing module connected to a control module, which includes a comparator powered from a reference voltage source, wherein the switching module includes modules of the first, second and third switches, and the second and third switch modules are connected to a comparator and a voltage increase and stabilization module, also connected in parallel to the first switch module, which, in turn, is connected to a control unit that, together with the power output module, implements the functions of a switching power supply.