RU191898U1 - MODULAR SECONDARY POWER SUPPLY - Google Patents

Abstract

The utility model relates to electrical engineering and can be used in modular switching secondary power supplies (VIP) with galvanic isolation. The purpose of the technical solution is to eliminate these drawbacks, namely, to increase the efficiency and simplify the design of remote control modular VIP. The goal is achieved by the fact that the modular secondary source power supply (1) (Fig. 4) includes input terminals (I), output terminals (Output) and control terminal (OPR); at least two secondary power supplies (2) with galvanic isolation, connected by inputs to the input terminals in parallel and outputs to the output terminals in series and having a remote control input (DU) on the secondary side, connected to the control terminal, and the control terminal (UPR) is connected with the remote control input (DU) of at least one secondary power source (2.2) through a voltage level former (3), including a series-connected pulse sequence generator unit ( 3.1), galvanic isolation block (3.2) and rectifier block (3.3). The device can be used to control several VIPs in various switching configurations, where a logic “0” / “1” is required to control on / off and galvanic isolation of control signals. In this case, one pulse train generator can be used for all control circuits.

Description

Technical field

The utility model relates to electrical engineering and can be used in modular pulsed secondary power supplies (VIP) with galvanic isolation.

State of the art

Secondary power supplies with galvanic isolation of the input and output can have a structure in which the device controlling the operation (for example, a PWM controller) can be located both on the primary [1] and on the secondary side [2].

From [3], the structures for constructing modular VIPs are known. The switching circuit, where the VIP inputs are connected in parallel, and the outputs in series (Fig. 1a) are used to increase the output voltage, and the circuit with a serial connection of inputs and parallel outputs (Fig. 1b) is for the opposite purpose.

In such modular VIPs, there may be a need to enable / disable VIPs by a control signal.

Further in the text, an embodiment of the modular VIP according to FIG. 1a.

In the case when the structure of the modular VIP is made on a VIP with control on the primary side (Fig. 2), the control, if the VIP has an appropriate input, does not cause difficulties [4-6]. The control signal “UPR” of the VIP is directly wound up to the remote control conclusions of the “remote control” of all the VIPs (Fig. 2), which are responsible for enabling / disabling the VIPs when a corresponding signal is applied to them.

In another case (Fig. 3), when the VIP control is organized on the secondary side, there is a problem with the supply of the control signal to the VIP2 located in the "upper arm". It is caused by the fact that VIP2 does not have a common “ground” with VIP1 in output and the control signal must have a level higher than the output voltage of VIP1 than the level of the control signal for VIP1 of the “lower arm”.

To increase the level of the control signal to the value required for VIP2, an additional voltage source, for example, a battery, can be used, but it discharges over time, not providing the required voltage level and requires replacement. Another option may be to use an additional converter that generates a control signal with the required voltage level at the output, which complicates the design of the entire modular VIP.

The purpose of the technical solution is to eliminate these drawbacks, namely, increasing efficiency and simplifying the design of remote control modular VIP.

This goal is achieved by the fact that the modular secondary power source (1) (Fig. 4) includes input terminals (I), output terminals (Output) and control terminal (OPR); at least two secondary power supplies with galvanic isolation (2.1 and 2.2) connected by inputs to the input terminals in parallel and outputs to the output terminals in series and having a remote control input (DU) on the secondary side connected to the control terminal (UPR), and the control terminal (UPR) is connected to the remote control input (DU) of at least one secondary power source (2.2) through a voltage level former (3) including a series-connected impulse generator block pulses (3.1), galvanic isolation unit (3.2) and rectifier unit (3.3).

In one embodiment, the pulse sequence generator unit (3.1) can be implemented on a multivibrator.

In another embodiment, the block of the pulse sequence generator (3.1) can be implemented on a specialized chip.

In one embodiment, the galvanic isolation unit (3.2) is implemented on a capacitor.

In another embodiment, the galvanic isolation unit (3.2) is implemented on a transformer.

In another embodiment, the galvanic isolation unit (3.2) is implemented on an optocoupler.

The operation of the device is described by the example of a modular VIP (Fig. 5) (1), including two VIPs (2.1, 2.2), connected in parallel at the input and in series at the output with control (for example, a PWM controller) located on the secondary side and having a remote control input "Remote control", which blocks the operation of the VIP module in the presence of a logical "1" on it and restores its operability in the presence of a logical "0" on it.

The rectangular pulse generator (3.1) is presented in the form of a multivibrator on T1-T4 bipolar transistors with control on a key element, a transistor T5, which starts and stops the generator. The galvanic isolation (3.2) is presented in the form of a pump capacitor C7. Rectifier (3.3) is made on diodes VD3, VD4 and capacitor C5 with a load on resistor R3.

Capacitors C1, C2 are the output filter, and the diodes VD1, VD2 are placed in order to protect the VIP from reverse polarity voltage.

The operation of the device is illustrated by timing diagrams (Fig. 6).

In the initial state, voltage Uin is applied to the inputs of the converters. At the input "UPR" (1) is supported by a logical "1" (graph 3, time t1) entering the VIP input (2.2) directly, blocking its operation, and to the key element, the gate of the transistor T5 translating it into open state . An open transistor T5 provides the operation of a rectangular pulse generator (3.1), which gives a sequence of pulses (graph 2, time t1-t3) passing through a galvanic isolation (3.2), a rectifier (3.3) and charging a capacitor C5 to a voltage sufficient to operate the circuit according to remote control input "remote control" (graph 1, time t2-t3), i.e. at the input "remote control" VIP (2-1) is formed logical "1". Both VIPs are off.

When the signal at the input “UPR” (1) passes to a logical “0” (graph 3, time t3), the VIP (2.2) is turned on. A voltage sufficient to open it ceases to flow to the gate of the transistor T5, and it closes, stopping the operation of the generator. The generator ceases to give out pulses (graph 2, time instant t3) and at the input “remote control” of the VIP (2.1) with a slight delay associated with the discharge of capacitor C5, a logical “0” is formed (graph 1, time instant t4). The VIP is turned on (2.1). At the output of the modular VIP (1), voltage Uout appears.

The generator can be powered, for example, from the output of the VIP, or from the control signal itself, and at the same time there is no need to use the key element T5.

The device can be used to control any number of VIPs in various switching configurations, where a logical “0” / “1” is required to control on / off and galvanic isolation of the control signals is required. In this case, one pulse train generator can be used for all control circuits.

It is possible to use the device (Fig. 7), in which the modular VIP (1) contains N pairs of VIP (2.1; 2.2 ... 2.N) connected in series at the output and in parallel at the input to one input voltage source. In this case, the voltage level driver (3) contains one generator (3.1) connected to the VIP input “ДУ”, N galvanic isolation (3.2.1 ... 3.2.N) and N rectifiers (3.3.1 ... 3.3.N) in each pair of VIP (2.1; 2.2. ... 2.N) connected in the “remote control” input of the VIP of the “upper arm” (2.1.2, 2.2.2 ... 2.N.2).

Such a VIP structure allows you to organize a power supply system in which N channels with the required output voltage are realized from one input voltage, for example, to provide power to the AFAR modules.

Used sources.

1. Patent SU 1148084 Secondary power supply, patent holder Institute of Electronic Control Machines, priority date 07/01/1983;

2. Patent US 7800037 Power supply control circuit with optical feedback, patent holder Carl Keith Sawtell, Paolo Menegoli, priority date 04/30/2008;

3. Moin B.C. Stabilized transistor converters. - M .: Energoatomizdat, 1986, pp. 231-232;

4. Zhdankin V. DC / DC transformers of the open-type housing for surface mounting, Modern automation technology, No. 1, 2002, pp. 60-74;

5. Creating Higher Voltage Outputs using Series Connected Sine Amplitude Converters, AN034, Application note, Vicor, October 2015;

6. PKU4116C SERIES CONNECTION, Application note 315, Ericsson Power Modules, February 2014.

Claims (6)

1. Modular secondary power supply, including input terminals, output terminals and control terminal; at least two secondary power supplies with galvanic isolation, connected by inputs to the input terminals in parallel and outputs to the output terminals in series and having a remote control input on the secondary side connected to the control terminal, the control terminal being connected to the remote control input of at least one secondary a power source through a voltage level former comprising a series-connected pulse train generator unit, a galvanic unit interchanges and rectifier unit. 2. The modular secondary power supply according to claim 2, characterized in that the pulse sequence generator unit is presented in the form of a multivibrator. 3. The modular secondary power source according to claim 2, characterized in that the pulse sequence generator unit is presented in the form of a specialized microcircuit. 4. The modular secondary power source according to claim 2, characterized in that the galvanic isolation unit is arranged on a capacitor. 5. The modular secondary power source according to claim 2, characterized in that the galvanic isolation unit is arranged on a transformer. 6. The modular secondary power supply according to claim 2, characterized in that the galvanic isolation unit is organized on an optocoupler.

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