Wohu Electronics Push-Pull Transformer Solutions

　In industrial electronic design, achieving power isolation and stable output is one of the key aspects to ensure reliable system operation.
　Wohu Electronics offers a complete isolated voltage switching regulation solution based on the push-pull topology. Through carefully selected component combinations, this solution meets the isolation power requirements of applications such as industrial servo systems and communication interfaces.
　Solution Composition and Technical Principles
　This solution (push-pull transformer-based solution) employs a push-pull topology and achieves voltage conversion and electrical isolation from input to output through the coordinated operation of the following core functional modules:

　Input Filtering
　A common-mode choke (CMC) is used at the power input as an input filter to suppress common-mode interference signals originating from the grid or upstream power sources. Currently available power common-mode chokes include the 7060, 9070, and 1211 series. These differ in physical size and inductance values, corresponding to different rated currents and filtering characteristics, allowing designers to select appropriate models based on actual power requirements. The purpose of input filtering is to ensure high-quality current enters the switching devices, providing relatively clean input power for subsequent circuitry.
　Switching Oscillation
　The filtered DC power must be converted into a high-frequency AC square wave, a process accomplished by electronic switches. The solution can use either bipolar junction transistors (BJTs) or MOSFETs as switching devices, which receive PWM (Pulse Width Modulation) signals from a controller and alternately turn on and off at a set frequency. Through this high-frequency switching action, DC power is inverted into a high-frequency pulsed current and fed into the primary winding of the push-pull transformer.
　Voltage Transformation and Isolation
　The push-pull transformer is the core component enabling both voltage conversion and electrical isolation. Available transformer series include 060, 06K, 06E, 06Q, and 088, each differing in package dimensions, pin configurations, and electrical parameters to accommodate various PCB layout requirements.
　The transformer operates on the principle of electromagnetic induction: when a high-frequency pulsed current flows through the primary winding, an alternating magnetic field is generated in the magnetic core, inducing a corresponding voltage in the secondary winding. The output voltage is determined by the turns ratio between the primary and secondary windings. During design, the appropriate turns ratio can be selected to convert the input voltage to the desired output voltage. Additionally, since there is no direct electrical connection between the primary and secondary windings, full electrical isolation is achieved between the input and output sides—an essential feature for preventing high-voltage-side faults from propagating into low-voltage control circuits.
　Rectification and Filtering
　The high-frequency AC square wave from the transformer’s secondary winding must be converted into stable DC power for the load.
　Rectification: Diodes are used to form a rectifier circuit that converts the AC square wave into a unidirectional pulsating DC waveform.
　Filtering: The rectified waveform contains high-frequency ripple components, which are smoothed using an LC filter network composed of filter capacitors and inductors. The combined effect of the capacitor’s charge/discharge characteristics and the inductor’s opposition to rapid current changes effectively suppresses abrupt voltage and current variations, ultimately delivering a stable DC output with low ripple.

　Typical Application Scenarios
　This solution has broad application foundations in industrial control, primarily reflected in the following two areas:
　Application 1: Power Supply for Digital Isolated Interfaces
　In industrial environments, bus communications such as RS485 and CAN often suffer from ground potential difference interference. If the power supply for the communication interface is not isolated, isolation components may fail due to excessive common-mode voltage.
　This solution can serve as an isolated power source for digital isolation ICs, providing an electrically insulated operating voltage for the communication interface side relative to the main system power. Only after the power supply is isolated can the communication bus truly achieve immunity against common-mode interference, preventing isolation components from losing their isolation capability due to ground potential fluctuations in the field and ensuring reliable data transmission.
　Application 2: Industrial Power Supply
　Beyond powering communication interfaces, this solution is also suitable for broader industrial power supply scenarios. In industrial drive systems, multiple isolated auxiliary power supplies are often required to power control circuits, driver circuits, and other subsystems.
　The push-pull topology-based power solution enables high-power output while maintaining stable output voltage. By appropriately selecting power inductors, transformers, and switching devices, this solution can deliver stable and reliable power across a wide input voltage range and under varying load conditions.

　From its founding in 2018 to its overseas expansion in 2025, Wohu Electronics has become a trusted partner for over 1,000 enterprises, thanks to its “solid quality, fair pricing, attentive service, and reliable delivery.”
　If you’re also looking for a communication and electronic components supplier that saves you “time, money, and hassle,” why not give Wohu a try? After all, it’s already the choice of more than 100 listed companies—so you can’t go wrong.
　Choose Wohu – Truly Reliable. It’s not just a slogan; it’s the answer written by over 1,000 customers through eight years of trust.