CZ306615B6 - A DC voltage source with two output voltages - Google Patents

Abstract

A DC voltage source with two output voltages, which comprises the transformer (TF) and the primary clips (P1, P2) to which there is supplied the primary alternating voltage (Up), and the secondary clips (S1, S2) on which there is the secondary alternating voltage (Us), the first capacitor (C1) , the second capacitor (C2), the first diode (D1) and the second diode (D2), where the positive clip of the first capacitor (C1) and the first secondary clip (S1) of the transformer (TF) are interconnected and conducted to the first output contact (A), the negative clip of the first capacitor (C1), the anode of the first diode (D1) and the negative clip of the second capacitor (C2) are interconnected and conducted to the second output contact (B), the cathode of the second diode (D2) and the positive clip of the second capacitor (C2) are interconnected and conducted to the third output contact (C), the anode of the second diode (D2), the cathode of the first diode (D1) and the second secondary clip (S2) of the transformer (TF) are interconnected, while between the first and the second output contact (A, B), there is the first output direct voltage (U1), and between the third and the second output contact (C, B), there is the second output direct voltage (U2) which is, contrary to the first output direct voltage (U1), twofold.

Description

DC voltage source with two output voltages

Field of technology

The invention relates to a DC voltage source with two output voltages connected to the secondary winding of a mains transformer, to which two one-way rectifiers are connected in series, the first with a base DC voltage and the second with a double DC voltage.

Prior art

It is currently known to connect a voltage doubler which provides only twice the DC voltage. However, it does not provide a DC base voltage, because the circuit diagram is such that this base voltage has the AC secondary voltage of the mains transformer superimposed.

The connection of current simple DC voltage sources provides only a single basic voltage. To obtain the basic and double voltage, it is necessary to use a mains transformer, which has a secondary winding divided into basic and double voltage, usually with a branch in the middle of the winding, and which is therefore more laborious and expensive to manufacture.

Probably the oldest voltage multiplier is of the "Euler" type, see Fig. 1, serving as a power supply for small tubes in transmitters and hybrid devices, in a DC voltage booster in transistor circuits, in nf technology for level indicators, for voltage-controlled feedback, etc. The disadvantage is only one double DC voltage, where the basic DC voltage is missing.

The other voltage multipliers used are the "Dellon classic" type, see Fig. 2, and the "Asymmetric Dellon", see Fig. 3. It is used as a source of symmetrical voltage, where larger ripples do not matter or for small consumptions. The modified connection is used at the input of switching power supplies when switching voltage levels 110 V (127 V) / 220 V (230 V to 240 V). To save copper and insulation, it is used in tube amplifiers as a power supply source for output stages, often in an unbalanced, three-diode version with a more demanding transformer with double winding or tap. The asymmetric Dellon provides three different voltages, two of the same and one with a higher voltage, or two of the same and one with a lower voltage. However, with a large load on one part, where the voltage decreases, the voltage in the other part may also decrease proportionally.

It is an object of the invention to provide a DC voltage source with two output voltages which overcomes the above-mentioned drawbacks of the prior art.

The essence of the invention

The above-mentioned drawbacks are largely eliminated by a DC voltage source with two output voltages, the essence of which consists in that it comprises a transformer with primary terminals to which the primary AC voltage is applied and secondary terminals on which the secondary AC voltage is applied, a first capacitor, a second capacitor, a first diode and a second diode, wherein the positive terminal of the first capacitor and the first secondary transformer terminal are interconnected and connected to the first output contact, the negative terminal of the first capacitor, the anode of the first diode and the negative terminal of the second capacitor are interconnected and connected to the second output. contact, the cathode of the second diode and the positive terminal of the second capacitor are interconnected and connected to the third output contact, the anode of the second diode, the cathode of the first diode and the second secondary terminal of the transformer are interconnected, with a first output DC voltage between the first and second output contacts and third and dr angular output

- 1 CZ 306615 B6 contact is the second output DC voltage, which is double compared to the first output DC voltage.

Explanation of drawings

The invention will be further illustrated by the figures, where Fig. 1 represents a voltage multiplier of the "Euler" type, Fig. 2 represents a voltage multiplier of the "Dellon classic" type, Fig. 3 represents a voltage multiplier of the "Asymmetric Dellon" type, and Fig. 4 represents a DC source. voltage with two output voltages according to the invention.

Examples of embodiments of the invention

The DC voltage source with two output voltages according to the invention is shown in Fig. 1 and comprises a transformer TF with primary terminals P1, P2 to which the primary AC voltage Up is applied, and secondary terminals S1, S2 on which the secondary AC voltage Us, the first capacitor C1, a second capacitor C2, a first diode D1 and a second diode D2. where:

- the positive terminal of the first capacitor C1 and the first secondary terminal S1 of the transformer TF are 20 interconnected and connected to the first output contact A,

- the negative terminal of the first capacitor C1, the anode of the first diode D1 and the negative terminal of the second capacitor C2 are interconnected and connected to the second output contact B,

- the cathode of the second diode D2 and the positive terminal of the second capacitor C2 are interconnected and connected to the third output contact C,

- the anode of the second diode D2, the cathode of the first diode D1 and the second secondary terminal S2 of the transformer

TFs are interconnected,

- between the first and the second output contact A, B there is a first output DC voltage U1 and between the third and the second output contact C and B there is a second output DC voltage U2, which is twice the first output DC voltage U1.

The principle of operation of the above-mentioned DC power supply with two output voltages according to the invention is as follows:

With a positive polarity of the AC secondary voltage Us of the transformer TF at the first secondary terminal 35 S1 against the second secondary terminal S2, the first capacitor C1 is charged to the positive first output DC voltage U1 via the first diode D1. With the negative polarity of the AC secondary voltage Us of the transformer TF at the first secondary terminal S1 against the second secondary terminal S2, the secondary AC voltage Us of the transformer TF and the first output DC voltage U1 are added and the second capacitor C2 is charged to the positive second output DC 40 via the second diode D2. voltage U2, which is twice the first DC output voltage U1. Both DC output voltages U1 and U2 have a common negative pole on the second output contact B.

The DC power supply according to the invention is able to provide two positive / negative voltages 45 of different magnitudes against a common ground point. This will create two almost independent sources that interact with each other. The ripples of the two voltages go against each other, which is advantageous for some types of devices, eg low-frequency devices, where the interference of the whole device is reduced in the case of powering one device. Due to the opposite course of the supply voltage ripple, mutual noise compensation occurs. In this case, less efficient filters are needed or filtration is more efficient. Active and passive filters or stabilizers are used.

The presented solution according to the invention allows the use of only one winding of the source transformer, without a tap, which means cheaper production and thus better competitiveness, since competing solutions need two windings to achieve the same source independence.

. 7.

The presented solution according to the invention achieves a source efficiency of 5 to 7% higher than the efficiency of already existing solutions known from the prior art. Higher energy efficiency with DC power supplies extends the life of electronics with the same battery capacity.

The presented solution according to the invention enables the construction of a simple and cheap production with multiple uses, especially for powering consumer electronics, or for simple auxiliary laboratory uses, especially fixed voltage sources 3Važ6V, 6Važl2V or 12 V to 24 V. The design and calculation of connections procedures for one-way rectifiers.

A specific use of the present invention is stationary and mobile electronics powered by accumulators, requiring a DC voltage of up to about 1.5 kV, transformer power supplies with standard sinusoidal voltage, or switching power supplies.

Claims (1)

PATENT CLAIMS A DC voltage source with two output voltages, characterized in that it comprises a transformer (TF) with primary terminals (P1, P2) to which the primary AC voltage (Up) is applied and secondary terminals (S1, S2), to of which is the secondary alternating voltage (Us), the first capacitor (C1), the second capacitor (C2), the first diode (D1) and the second diode (D2), where - the positive terminal of the first capacitor (C1) and the first secondary terminal (S1) of the transformer (TF) are interconnected and connected to the first output contact (A), - the negative terminal of the first capacitor (C1), the anode of the first diode (D1) and the negative terminal of the second capacitor (C2) are interconnected and connected to the second output contact (B), - the cathode of the second diode (D2) and the positive terminal of the second capacitor (C2) are interconnected and connected to the third output contact (C), - the anode of the second diode (D2), the cathode of the first diode (D1) and the second secondary terminal (S2) of the transformer (TF) are interconnected, - wherein between the first and second output contacts (A, B) there is a first output DC voltage (U1) and between the third and second output contacts (C, B) there is a second output DC voltage (U2) which is opposite to the first output DC voltage (U2). Ul) double.