## 1 Introduction
Using a large number of active switching devices increases the overall size as the volume of the gate control circuit is larger than that of the operating devices;
3. Switching schemes and circuit topologies are complex to realize the required output. Figure 1: Conventional symmetrical bipolar voltage gain converter. The formerly stated deficiencies, as reported in the literature, are tried to cope with the newly developed circuit topology, as illustrated in Figure 2. There is a use of eight diodes, in which four diodes (\(D_{1}\) to \(D_{4}\)) operate at low line frequency, contributing to no switching losses as their switching frequency is low. Two diodes (\(D_{7}\) and \(D_{8}\)) connected across the fast switching transistors (\(Q_{2}\) and \(Q_{4}\)) never conduct and are only used for protection as they remain reverse biased with respect to the polarity of the source or load voltage. These diodes ensure the elimination of the current interruption problem of the inductive current; otherwise, there is a risk of failure of the operating devices due to the generation of high inductive voltage surges. The remaining two diodes (\(D_{3}\) and \(D_{5}\)) have to operate at a high switching frequency, but their switching losses can also be ignored as they have low reverse recovery times. These diodes only conduct in the PWM-off intervals of the high-frequency operating transistors. The instantaneous currents of these conducting diodes are the same as the filtering inductor's current. These diodes can contribute to conduction losses. The noticeable feature of this recommended circuit is the use of only four transistors instead of six, as used in [23]. This would help compact the converter in terms of size and overall cost, as these values of the gate control circuit are much larger than the operating transistor. Input and output (load) terminals are connected to capacitors to main their power quality indexes at acceptable levels. One inductor always remains connected in series with the load for the switching intervals in which the power is stored and transformed to the load. A reliable low film value capacitor with low losses may be connected at the output of the rectifier circuit or the input of the inverter. A summary of the noticeable characteristics of the proposed circuit may be enlisted as:  
1. There is the use of a fewer number of active switching devices;
2. There is also a reduction in two gate control circuits compared to the circuit in [23];
3. The overall impact of this achievement is the reduction in size, cost and conversion losses;
4. Only two commercially available single-phase diode and inverter modules may be effectively employed to obtain the required results;
5. The problem of control complication is tackled by introducing a simple switching algorithm that can be successfully used to produce the non-inverting and inverting outputs. The remaining arrangement of this manuscript includes the description of possible operating modes in Section 2. It also includes the design procedure to find out the values of the filtering components employed at output and input to tackle the problem of their power quality. Section 3 covers the detailed analysis where the attractive characteristics of the proposed circuit are compared with the available similar existing circuits. The test results gained from the computer simulation environment and the practically developed model are represented in Section 4. A case study was introduced in Section 5 to explore  
Figure 2: Proposed compact size bipolar voltage gain AC–AC converter. one of the application areas of the proposed circuit for grid voltage compensation. The conclusion is stated in Section 6.