Magnetically coupled step-up DC voltage regulator

Abstract

FIELD: electrical engineering.SUBSTANCE: constant voltage regulators used in secondary power supply systems for regulating and stabilizing constant output voltage. The device comprises a power regulating switch 1, a magnetically coupled magnetic element 10 containing three windings 2, 3, 7, with capacitors 4, 5, 8 connected in series with each winding, wherein winding 2, with its lead connected to the positive terminal of the input source of direct voltage, with its end to capacitor 4, forms the first branch, and the second capacitor 5, also connected to the positive terminal of the input source of direct voltage, with its second pole connected to the lead of the second winding 3, the end of which is connected to capacitor 4, forms the second branch included in parallel with the first branch, and between the end of winding 2 and the lead of winding 3 a shunt diode 6 is connected, with its anode to the end of winding 2, and with its cathode to the lead of winding 3, wherein the power regulating switch 1 is connected with its positive pole to the common connection point of the end of winding 3 and capacitor 4, the second pole of which is connected to the negative terminal of the input source direct voltage, forming a common bus, in parallel to which the third winding 7 of the magnetic element 10 is connected with a series-connected capacitor 8, in parallel to which the load 9 is connected, with the end to the positive pole of the power regulating key, and the lead to the common connection point of the capacitor 8 with the load 9.EFFECT: reducing the pulse current through the regulating key and the shunt diode, and increasing efficiency.2 cl, 2 dwg

Description

[0001] The invention relates to electrical engineering, in particular to constant voltage regulators, and can be used in secondary power supply systems for regulating and stabilizing constant output voltage.

[0002] DC voltage regulators are known that increase the output voltage in relation to the input DC voltage [1].

[0003] The disadvantage of known constant voltage regulators that increase the output voltage in relation to the input constant voltage is the inability to reduce the pulse current through the regulating key and shunt diode, increasing efficiency.

[0004] The closest in technical essence to the proposed device is a step-up DC voltage regulator [1].

[0005] The disadvantage of this DC step-up regulator is that it cannot reduce the pulse current through the regulating switch and shunt diode and improve the efficiency.

[0006] The stated objective is achieved in that in the device, instead of one linear inductance, a magnetically coupled element is included, containing three windings, with capacitors connected in series to each of them, wherein the first winding 2 is connected with its beginning to the positive terminal of the input DC voltage source, with its end to the capacitor 4, forming the first branch, and the second capacitor 5, also connected to the positive terminal of the input DC voltage source, with its second pole connected to the beginning of the second winding 3, the end of which is connected to the capacitor 4, forming the second branch, included in parallel with the first branch, and between the end of the winding 2 and the beginning of the winding 3, a shunt diode 6 is included, with its anode to the end of the winding 2, and with its cathode to the beginning of the winding 3, while the power regulating switch 1 is connected with its positive pole to the common connection point of the end of the winding 3 and the capacitor 4, the second pole of which is connected to the negative terminal of the input DC source voltage,forming a common bus, in parallel to which the third winding 7 of the magnetic element 10 is connected with a series-connected capacitor 8, in parallel to which a load 9 is connected, with the end to the positive pole of the power control key, and the beginning to the common connection point of the capacitor 8 with the load 9.

[0007] Fig. 1 shows the basic electrical circuit diagram of the proposed magnetically coupled step-up DC voltage regulator.

[0008] Fig. 2 shows the basic electrical circuit diagram of the proposed magnetically coupled step-up DC voltage regulator with an additionally introduced linear inductance.

[0009] It (Fig. 1) has a power control key 1, a magnetically coupled magnetic element 10 containing three windings 2, 3, 7, with each of which capacitors 4, 5, 8 are connected in series, wherein winding 2 is connected with its beginning to the positive terminal of the input DC voltage source, with its end to capacitor 4 forming the first branch, and the second capacitor 5 is also connected to the positive terminal of the input DC voltage source, with its second pole to the beginning of the second winding 3, the end of which is connected to capacitor 4, forming the second branch included in parallel with the first branch, and between the end of winding 2 and the beginning of winding 3 a shunt diode 6 is connected, with its anode to the end of winding 2, and its cathode to the beginning of winding 3, wherein the power control key is connected with its positive pole to the common connection point of the end of winding 3 and capacitor 4 1, the second pole of which is connected to the negative terminal of the input DC voltage source, forming a common bus,in parallel to which the third winding 7 of the magnetic element 10 is connected with a series-connected capacitor 8, in parallel to which the load 9 is connected, with the end to the positive pole of the power control key, and the beginning to the common connection point of the capacitor 8 with the load 9.

[0010] We will consider the operating principle of the proposed magnetically coupled step-up DC voltage regulator based on the assumption of ideal key elements, steady-state operating mode, and continuous change of magnetic flux in the core of the magnetically coupled magnetic element.

[0011] Let us denote by D the duration of the on state of key 1 relative to the period T.

[0012] When the switch 1 is closed, during the time DT, two processes occur simultaneously - the accumulation of magnetic energy in the magnetically coupled magnetic element 10 of the input DC voltage and capacitors 4, 5 charged to voltage V IND / (1-2D) and the removal of magnetic energy from the magnetic element 10 through the winding 7 into the load, as a result of which a differential current flows through the regulating key, reducing the key current by the amount of the load current.

[0013] After the regulating key 1 is turned off, the polarity of the emf on all windings of the magnetic elements is reversed and the shunt diode 6 is turned on, which is in a conducting state for a time of (1-D)T, through which the capacitors 4.5 are charged to a voltage of V IN D / (1-2D), and the load current is subtracted from the current of the shunt diode, since the current of winding 7 of magnetic element 10 is switched to the constant input voltage source, capacitors 4, 5 and flows towards the forward current through the shunt diode 6, and the output voltage Vin(1-D) / (1-2D) is established on the load.

[0014] To enhance the subtractive effect and increase the efficiency, Fig. 2 shows a second embodiment of a magnetically coupled step-up DC voltage regulator, in which the number of turns of winding 7 is greater than the number of turns of windings 2, 3, and a linear inductance 11 is connected in series with winding 7.

[0015] Thus, the proposed magnetically coupled step-up DC voltage regulator, unlike the known device, allows for highly efficient conversion of the consumed energy from the input DC voltage source by transferring energy to the load over time (1-D)T with simultaneous subtraction of the load current from the current of the regulating switch 1 and the shunt diode 6.

[0016] 1. Polikarpov A.G., Sergienko E.F. Single-ended converters in power supply devices of electronic equipment, “Radio and Communications”, 1989, p. 6, Fig. 1.2.

Claims

1. A magnetically coupled step-up DC voltage regulator comprising a linear inductance, a regulating key, a shunt diode, an output capacitor with a parallel-connected load, characterized in that three magnetically coupled windings are introduced, with each of which a corresponding capacitor is connected in series, wherein the first magnetically coupled winding is connected with its beginning to the positive terminal of the input DC voltage source, with its end to the first capacitor and forms the first branch with the first capacitor, the second capacitor is connected with its first pole to the positive terminal of the input DC voltage source, with its second pole to the beginning of the second magnetically coupled winding, the end of which is connected to the first capacitor and forms with the second magnetically coupled winding a second branch connected in parallel with the first branch, a shunt diode is connected between the end of the first magnetically coupled winding and the beginning of the second magnetically coupled winding,the anode connected to the end of the first magnetically coupled winding, and the cathode to the beginning of the second magnetically coupled winding, wherein a power regulating key is connected with its positive pole to the common connection point of the end of the second magnetically coupled winding and the capacitor of the first branch, the second pole of which is connected to the negative terminal of the input DC voltage source, forming a common bus, a third magnetically coupled winding with a third capacitor connected in series with a parallel-connected load is connected in parallel to the power regulating key, the end of which is connected to the positive pole of the power regulating key, and the beginning to the common connection point of the third capacitor with a parallel-connected load.

2. A magnetically coupled step-up DC voltage regulator according to paragraph 1, characterized in that the number of turns of the third magnetically coupled winding is greater than the number of turns of the first two magnetically coupled windings, and a linear inductance is connected in series with the third magnetically coupled winding.

Images