The control chip of the DC regulated power supply uses relatively mature imported components, and the power supply components utilize the latest internationally developed high-power components. The design of the adjustable DC regulated power supply eliminates the bulky size caused by the power transformer in traditional DC power supplies. Compared with traditional power supplies, high-frequency DC power supplies have advantages such as small size, light weight, and high efficiency, which also creates conditions for the miniaturization of high-power DC power supplies. This type of power supply is also called a high-frequency adjustable switching power supply. The adjustable DC regulated power supply has comprehensive protection functions, allowing continuous setting and prediction of overvoltage and overcurrent points, and touch switch control of the output voltage.
Working Principle of the Adjustable DC Regulated Power Supply
When the input AC voltage is 150V-260V, the parameter stabilizer outputting a 220V voltage regulator works better. Below and above this range, its efficiency decreases. A microcontroller is used for the first step of control, keeping the input voltage below 310V and above 90V, and adjusting and controlling it within the 190V-250V range. Then, a parameter regulator is used for voltage regulation.
The AC input voltage fluctuates significantly, and high-frequency pulses and other interference voltages are filtered by an overvoltage absorption filter circuit before entering the DC switching regulator, AC sampling circuit, and control execution circuit.
The DC switching regulator has low power but can use +5V, +12V, and -12V DC voltages to replace the 60-320V AC voltage. The 5V voltage is used for the microcontroller, and the ± high-power switching module is used for the 12V voltage supply control circuit.
The acquired input voltage data is analyzed and judged, and control signals are sent to the trigger circuit to control and adjust the output voltage.
The control execution circuit consists of a high-power SSR zero-crossing switch module and a tapped automatic transformer. An RC absorption circuit absorbs overvoltage and overcurrent between SSRs, preventing damage during switching. The control execution circuit controls the 90-310V input voltage between 190V and 240V before sending it to the parameter regulator for precise voltage stabilization.
The parameter regulator consists of an inductor and a capacitor, with an oscillation frequency of 50Hz. Regardless of changes in the pipeline power supply, its oscillation frequency remains constant, therefore the output voltage also remains unchanged, resulting in high voltage regulation accuracy. Even with significant distortion in the input voltage waveform, the parameter stabilizer outputs a standard sine wave after oscillation, thus providing strong anti-interference and purification capabilities.
Protection Alarm Circuit: When equipment safety is threatened, only an audible and visual alarm is triggered to alert operators to take action without cutting off the output voltage. An audible and visual alarm will sound when there is no output voltage, the control box temperature is too high, the AC input exceeds 300V, or the AC input falls below 130V. When the input current is too high, the input (output) automatic circuit breaker will automatically trip.
Function of Adjustable DC Regulated Power Supply
In different applications, adjustable DC regulated power supplies have different names: maintenance power supply, experimental power supply, general-purpose power supply, and adjustable regulated power supply. As the name suggests, the main function of an adjustable DC regulated power supply is to convert AC power to DC power (mostly for low-voltage DC power applications) and provide a constant DC voltage source. The output voltage can usually be adjusted within the product design range as needed.
Laboratories
Most laboratories and studios use adjustable DC regulated power supplies with voltage and current indication functions. They provide reliable power while also monitoring changes in power current. This is much more convenient and efficient than measuring current by connecting a multimeter in series with the main power circuit. As functional extensions, many products also offer overvoltage protection, overcurrent protection, short-circuit protection, constant current sources, programmable memory voltage parameters, etc.
Electronic Products
Many modern electronic products, especially consumer electronics, including mobile phones, laptops, and digital products, are driven by low-voltage DC. Many failures are caused by faulty power adapters or power supply units, thus making adjustable DC regulated power supplies widely used in product development and maintenance.
Electronic Studios
Adjustable DC regulated power supplies are essential instruments in electronic studios of all sizes. Many photography studios may not have oscilloscopes, but they must have adjustable DC regulated power supplies.
Electronic Products
For the development of electronic products, actual power supply experiments with adjustable DC regulated power supplies can help understand the actual current requirements of the product and thus determine the parameters of the product's power supply unit.
By utilizing the voltage regulation function of an adjustable power supply, it's possible to simulate the battery's operation under undervoltage conditions, and even test the product's overvoltage protection function and adaptability to voltage fluctuations. This allows for the design of low-voltage alarm functions or battery status scales.
Electronic Testing: For electronic testing, using an adjustable DC regulated power supply avoids considering the charging saturation and internal resistance of the electronic product itself, which can cause output voltage variations that interfere with test data. Many professional testing procedures also stipulate the use of a regulated power supply to replace any leakage current in the original equipment.
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