A line of AC/DC converters from RHOM. Reference data

Encyclopedia of radio electronics and electrical engineering / Application of microcircuits

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Recently, most household devices (even very simple ones) have intelligent functions through the use of microcontrollers or specialized control circuits, and the main power source for household devices is the mains voltage. In this case, to power the control circuits of these devices, it is necessary to form reduced DC supply voltages.

The use of standard methods for obtaining such voltages (step-down transformers, switching power supplies) leads to an increase in the cost of devices and an increase in their dimensions. The RHOM company, which developed a line of hybrid microcircuits for low-power AC / DC converters, took a different path. The absence of a transformer allows you to save up to 50% of power in standby mode, in relation to a traditional power source. Using a rectified mains voltage (about 300 V), the converters generate various DC voltages at the output (see Table 1).

Table 1

Chips are designed for use in personal computers (PC cards and flash memory modules), toys, measuring and industrial equipment, communication systems, household appliances, office equipment, LCD displays.

Let us consider in more detail the main characteristics of the listed microcircuits, as well as the principle of their operation.

ВР5О41А, ВР5О41А5, ВР5О41А15

The main electrical parameters of microcircuits are shown in Table. 2-4.

The pin assignments and the appearance of the microcircuit package are shown in fig. 1, and their block diagram - in fig. 2. BP5041A parameters in table 2, BP5041A5 - table 3, BP5041A15 - table 4

Table 2

Rice. 1. Appearance of the microcircuit package

Table 3

Table 4

The voltage from the mains rectifier through the pin. 10 of the chip is fed to the switching circuit. Depending on the state of the control circuit, the input voltage is connected or disconnected from the circuit formed by the inductance, current detector, external filter capacitance and load connected to the pin. 1 microchip. The value of the voltage on the pin. 1 is controlled by a voltage detector. At the moment the input voltage is connected to the circuit, a linearly increasing current begins to flow through the inductance. When the limit value of the current or the required voltage value is reached, the control circuit generates a signal to turn off the input voltage from the circuit. At this moment, a reverse current is formed through the internal diode of the microcircuit due to the energy accumulated in the inductance. After that, the process is repeated. On the output 1, a sequence of pulses is formed, which is integrated by an external capacitor, thus forming the output voltage.

Rice. 3 a, b. Device switching schemes

The schemes for switching on devices are shown in fig. 3 a, b. The input circuit of devices can consist of a half-wave rectifier (Fig. 3a) or a bridge rectifier (Fig. 3b). Rectifier diodes (VD1, Fig. 3a; bridge rectifier, Fig. 36) are recommended to be selected with the following parameters:

• reverse voltage not less than 700 V;
• average rectified current 0,5 A or more;
• the maximum peak current value is 20 A or more.

The capacitance value of the rectifier filter capacitor (C1 in Fig. 3) can be within ZD..10 μF. The capacitor must have an operating voltage of at least 450 V.

The filter capacitor (C2 in Fig. 3) must have a low impedance to reduce the level of ripple. The value of its capacitance should be in the range of 100 ... 470 microfarads.

The RC filter on capacitor C3 and resistor R1 (Fig. 3) is designed to suppress interference from the converter chip into the mains. The value of the resistor must be within 10 ... 22 ohms, and its power must be at least 0,25 watts. Capacitor C3 - film, designed for an operating voltage of at least 400 V. It must be placed as close as possible to the pins of the microcircuit.

ВР5048, ВР5О48-15, ВР5О42-15, ВР5О47А-24, ВР5О48-24

The main electrical parameters of microcircuits are given in Table. 5-9.

The pin assignments and the appearance of the microcircuit package are shown in fig. 4. Chips of this type use an external inductor. The block diagram of the devices is shown in fig. 5. Their work is similar to those discussed above.

Table 5

Rice. 4. Pin assignments and appearance of the microcircuit package

Rice. 5. Structural diagram of devices

Table 6

The device connection diagram is shown in fig. 6. The diode of a half-wave rectifier VD1 must withstand a reverse voltage value of at least 800 V, the value of its average rectified current must be at least 0,5 A. The maximum peak current of the diode must be at least 20 A.

Rice. 6. Scheme of switching on devices

The capacitance value of the capacitor C1 of the rectifier filter can be within ZD..22 μF. The operating voltage of the capacitor must be at least 450 V. To protect against static electricity and impulse currents, a ZNR varistor is installed in the input circuit.

The RC filter on capacitor C2 and resistor R1 is designed to suppress interference from the converter chip into the mains. The resistor value must be within 10 ... 22 Ohms, and its power must be at least 0,25 watts. Capacitor C2 - film, with a capacity of 0,1-0,22 microfarads with an operating voltage of at least 450 V.

The filter capacitor C3 ¦ is used to reduce the level of ripple, it must have a low impedance and a capacitance in the range of 100 ... 470 microfarads. The external coil must withstand a current flowing through it of at least 0,4 A. The inductance of the coil is 1 mH for BP5048, BP5048-15, BP5042-15 and 1,5 mH for BP5048-24, BP5047A24.

Table 7

Table 8

Table 9

ВР5О46-5, ВР5О46

The main electrical characteristics of microcircuits are given, respectively, in Table. 10 and 11.

The appearance of the microcircuit package and the pin assignments are shown in fig. 7, and the block diagram of the devices - in fig. 8. An external inductor is also connected to microcircuits of this type.

Rice. 7. Appearance of the microcircuit package and pin assignments

Rice. 8. Structural diagram of devices

The scheme for switching on devices is shown in fig. 9. They form voltages of negative polarity, so diodes and capacitors are connected in reverse polarity. The input circuit of the devices consists of a half-wave rectifier on the diode D1 (the value of the reverse voltage is not less than 800 V, the average rectified current is not less than 0,5 A, the maximum peak current value is not less than 20 A).

Rice. 9. Scheme of switching on devices

The capacitance of the capacitor C1 must be 22 microfarads, and its operating voltage is not less than 450 V. To protect against static electricity and surge currents, a ZNR varistor is installed in the input circuit.

The remaining elements of the circuit are similar to those described for the BP4048 chip.

The external coil must be capable of withstanding a current flowing through it of at least 0,6 A. The inductance of the external coil must be 470 µH for the BP5046-5 (current through the coil is 0,57 A) and 1,5 mH for the BP5046 (current through the coil-0,3 .XNUMX A).

Table 10

Table 11

VR5O85-15

Unlike the devices discussed above, this microcircuit generates two output voltages. The main electrical parameters of microcircuits are given in Table. 12.

The appearance of the microcircuit case and the pin assignment are shown in fig. 10. An external coil with an inductance of 1 mH, designed for a current of at least 0,6 A, is connected to the microcircuit.

Table 12

The scheme for switching on the device is shown in fig. 11. The device generates two voltages of positive polarity. The input circuit of the devices consists of a half-wave rectifier on the VD1 diode (the value of the reverse voltage is not less than 800 V, the average rectified current is not less than 1,0 A, the maximum peak current value is not less than 40 A).

Rice. 10. Appearance of the microcircuit case and pin assignment

Rice. 11. Scheme of switching on the device

The capacitance of capacitor C1 can be in the range of 33 ... 820 μF, and its operating voltage is not less than 450 V. To protect against static electricity and impulse currents, a ZNR varistor is installed in the input circuit.

The RC filter on capacitor C2 and resistor R2 is designed to suppress interference from the converter chip into the mains. The value of the resistor must be within 10 ... 22 ohms, and its power must be at least 0,25 watts. Capacitor C2 - film, with a capacity of 0,1 ... 0,22 microfarads with an operating voltage of at least 450 V.

Filter capacitors C3 and C4 can have a capacitance in the range of 220 ... 1000 uF.

Publication: cxem.net

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