RU2533197C1 - Uninterrupted power supply source - Google Patents

Abstract

FIELD: electricity.

SUBSTANCE: source comprises two input AC/DC voltage converters and output DC/DC voltage converters, converters control system and accumulator battery (AB). Output of the first input AC/DC voltage converter is coupled through a diode to the load, and output of the second output converter through another diode to the AB. The output DC/DC voltage converter is coupled between cathodes of the above diodes downstream the input converters. An electronic switch and output contactor is coupled in parallel to the output DC/DC voltage converter.

EFFECT: uninterrupted power supply in case of failure of any own units of the power supply source.

3 dwg

Description

The invention relates to electrical engineering, in particular to guaranteed DC power supply units, including AC / DC and DC / DC converters, designed for uninterrupted power supply of consumers and special objects.

A known installation of guaranteed power supply, containing busbars for AC power supply, rectifiers attached to them, one of which is connected to a battery (AB) (patent RU 2050664, H02J 7/34, H02J 9/06, publication 20.12.1995).

The closest analogue of the claimed invention is an uninterruptible power supply containing input DC / DC voltage converters, the output of one of which is connected to the load, output DC / DC voltage converter, control system of converters, and rechargeable from a DC / DC voltage converter AB (US patent 6225708 , H03J 7/00, publication 01.05.2001). This device is designed to power low-current circuits, is designed to provide uninterrupted power when external power is cut off, but has insufficient protection against failures of its own elements.

The technical result, to which this invention is directed, is to ensure uninterrupted power supply in case of failure of any of its own nodes.

The technical result is achieved by the fact that the uninterruptible power supply contains two input AC / DC voltage converters, the output of one of which is connected through the diode to the load, and the output of the second through the other diode to the battery; output DC / DC voltage converter connected between the cathodes of the diodes after the input converters; converter control system; in addition, an electronic switch and an output contactor are connected in parallel with the output DC / DC voltage converter, the input converter comprising a step-up controller comprising inductance element and a semiconductor diode connected in series, the first power output of the first key element, the control input of which is connected to the first output of the control system, and a resonant transform is connected to the second output of the diode and the second power output of the first key element a body containing a circuit of two series-connected capacitors and a circuit of two series-connected second and third key elements, the control inputs of which are connected to the second and third outputs of the control system, and a circuit of series-connected third capacitor is connected between the connection point of the capacitors and the connection point of the key elements and the primary winding of the transformer, to the secondary winding of which a rectifier is connected, the output of which is the output of the input converter, the control system includes PID controllers and pulse width modulators (PWM), the output of the first of which forms the first output of the control system, the second and third outputs of which are formed by the outputs of the second and third pulse width modulators, the inputs of which are connected to the output of the PID controller , the inputs of which signals are the battery current and the reference current varying from 0 to I _max, and the input of the first pulse width modulator circuit connected to the output "less smaller", one of whose inputs is connected to Exit PID, the inputs of which the voltage signals are applied to the battery pack and the reference voltage and another input - to the output of the PID controller, the inputs of which are supplied current signals AB and a reference current that varies from 0 to I _max.

Figure 1 shows the structural diagram of the Converter, figure 2 shows the structural diagram of an AC / DC converter (one of the converters VP1 or VP2), Figure 3 shows the control system of the converters VP1 or VP2 and battery charge.

The uninterruptible power supply (Figure 1) contains input AC / DC voltage converters VP1 (1) and VP2 (2) connected by their inputs to two AC networks (A, B, C and A ₁ , B ₁ , C ₁ ), connected by their outputs through diodes (27) and (28) respectively to the output DC / DC voltage converter Outlet (3), the control system of the SU (4) and AB (5) converters. The output VP1 (1) is connected to the load (6) through the diode (27). AB (5) is connected through a diode (28) to the output of the input converter VP2 (2). Between the cathodes of the diodes (27) and (28), the output converter Exit (3), an electronic switch (EC) (7), consisting of a series-connected transistor and a diode, and an output contactor KM (8) are connected. Each of the input converters (Figure 2) contains a step-up regulator (9), containing in series the inductive element L (10) and the semiconductor diode VD1 (11), to the connection point of which the first power output of the first key element VT1 (12) is connected, controlling input VT1 (12) is connected to the first output of the control system SU (4). A resonant converter (30) is connected to the cathode of diode VD1 (11), which consists of two series-connected capacitors C1 (13), C2 (14), a chain of two second and third key elements VT2 (15), VT3 (16) connected in series. The control inputs of the latter are connected to the second and third outputs of the control system of the control system (4). Between the connection point of the capacitors C1 (13), C2 (14) and the connection point of the key elements VT2 (15), VT3 (16), a circuit is connected from the third capacitor C3 (17) connected in series and the transformer primary winding T (18). A rectifier (19) is connected to the secondary winding (29) of the transformer T (18), the output of which forms the output of the input converter (1) or (2). The control system of the control system (4) (Figure 3) includes PID controllers and pulse-width modulators, the output of the first pulse-width modulator (20) is the first output of the control system of the control system (4), the second and third outputs of which are formed by the outputs of the second and third pulse width modulators (21), (22). The inputs of the latter are connected to the output of the PID controller (23), to the inputs of which the signals of the battery current and the reference current, varying from 0 to I _max, are supplied. The input of the first pulse-width modulator (20) is connected to the output of the circuit "less than the smaller" (24), one of the inputs of which is connected to the output of the PID controller (25), the inputs of which are supplied with voltage signals from the battery and the reference voltage, and the other input - to the output of the PID controller (26), to the inputs of which the signals of the current AB and the reference current, varying from 0 to I _max .

The claimed device operates in the following modes.

1. Normal mode

Input converters VP1, VP2 - are operational and working, the output converter Exit - is unloaded due to the installation of a lower voltage than the output of VP1 from the control system of the voltage at the output of the Exit. For example:

VP1 - U _{OutRef VP1} = 110 B;

Exit - U _{OutRef Exit} = 105 B.

In this mode, the load receives voltage from VP1, and VP2 charges the battery.

2. VP1 is faulty; VP2 and VykhP - work.

Voltage is supplied to the load through the Output from VP2, while VP2 charges the battery.

3. VP2 is faulty; VP1 and VykhP - work.

Converter VP1 through the converter Output charges the battery; voltage on the battery is formed depending on the temperature U _ABBout = U (T ° C). At the same time, VP1 provides voltage to the load.

4. Failure of VP1 and VP2. Exit feeds the load from the battery.

5. Failure of VP2 and Exit. VP1 feeds the load with increased voltage and through the CM the battery is recharged (Buffer mode AB).

6. Failure of VP1 and Exit. VP2 generates a constant voltage at the output for recharging the battery and feeds the load through the CM.

7. Failure of VP1, VP2 and Exit. The load is fed through the CM from the battery.

Charge the battery (5) with a resonant converter (30)

Start process

1. Initially, the reference signals of the PID controllers for voltage and current are equal to zero.

2. The reference signal for the PID current of the VP2 resonant converter regulator gradually increases from 0 to I _max , while the charge current of the battery is ensured during operation of the VP2, and the resonant converter operates in non-resonant mode.

3. As soon as the PID regulator of the VP2 resonant converter has maximized the duty cycle and the charge current has been set below the reference, work is performed with the participation of a boost controller. In this case, the current reference signal changes to the value IRef = I _max + Delta so that the VP2 resonant converter does not interfere with the battery charge mode. Delta - a small value of the battery charge current.

4. As soon as the VP2 converter operates in the resonant mode, the voltage reference signal is abruptly set to the required level, for example 120 V. Now the PWM of the up-regulator provides its duty cycle equal to zero, since the block “less than the smaller one” selects the PID current, whose reference signal is set to zero. Then the current reference signal smoothly rises to the value of I _max .

5. The start process is complete. A function is started that changes the output voltage of the resonant converter depending on the temperature of the battery.

Claims (1)

An uninterruptible power supply containing two input AC / DC voltage converters, the output of one of which is connected through the diode to the load, and the output of the second through the second diode to the battery, the output DC / DC voltage converter, control system of the converters and the battery, characterized in that the output DC / DC voltage converter is connected between the cathodes of these diodes, an electronic switch and an output contactor are connected in parallel with the output DC / DC voltage converter, each the inverter contains a step-up regulator with a series-connected inductive element and a semiconductor diode, to the connection point of which is connected the first power output of the first key element, the control input of which is connected to the first output of the control system, and a resonant connected to the other terminal of the diode and the second power output of the first key element a converter comprising a circuit of two series-connected capacitors and a circuit of two series-connected second and third its key elements, the control inputs of which are connected to the second and third outputs of the control system, and between the connection point of the capacitors and the connection point of the key elements a circuit is connected from the third capacitor connected in series and the primary winding of the transformer, to the secondary winding of which a rectifier is connected, the output of which is the output of the input converter, and the control system includes PID controllers and pulse-width modulators, the first of which forms the first in stroke control system, the second and third outputs which are formed by the outputs of the second and third pulse width modulators, the inputs of which are connected with the output of the PID controller, the inputs of which are supplied current signals AB and a reference current that varies from 0 to I _max, and the input of the first pulse -pulse modulator is connected to the output of the circuit "less than the smaller", one of the inputs of which is connected to the output of the PID controller, the inputs of which supply voltage signals to the battery and the reference voltage, and the other input to the output of the PID controller, the inputs of which ayutsya current signals AB and a reference current that varies from 0 to I _max.

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