JPH0440948B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a multiplier rectifier circuit capable of setting an arbitrary output voltage.

[Technical background of the invention and its problems]

In general, in a multi-voltage rectifier circuit, with respect to the AC voltage input to the circuit, the output voltage can, in principle, be set only to the rectification times that of the AC voltage.

[Purpose of the invention]

This invention has been made in view of the above circumstances, and an object of the present invention is to provide a multiplier rectifier circuit that can set an arbitrary output voltage and, even when obtaining multiple outputs, can arbitrarily set the ratio between the output voltages. purpose.

[Summary of the invention]

This invention provides a plurality of intermediate taps on the output winding of a transformer combined with a multiplier rectifier circuit, connects one of the intermediate taps to a reference potential point, and combines different voltages obtained thereby. The purpose is to set an arbitrary output voltage.

[Embodiments of the invention]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an embodiment for explaining the operating principle of the present invention, in which a rectangular wave alternating current voltage source E is connected between both ends of the primary winding of a transformer T. The secondary winding of the transformer T is provided with output terminals a, d and intermediate taps b, c. This intermediate tap C is grounded and connected to the terminals e of a plurality of series-connected diodes D ₁ , D ₂ , D ₃ , D ₄ , and the cathodes i of these diodes D ₁ to _{D 4} are connected to the output terminal. End A
connected to. A capacitor C ₁ is connected between the connection point h of the diodes D ₃ to _{D 4} and the output terminal a, and a capacitor C ₂ is connected between the connection point f of the diodes D ₁ and D ₂ and the intermediate tap b. is connected.
The cathode side i of the diode _D4 and the diode
A capacitor C ₃ is connected between D ₁ and the anode side e, and a capacitor C ₄ is connected between the connection point g of the diodes D ₂ and D ₃ and the output terminal d.

That is, with respect to the ground potential, point a is 490V, point b is
It is assumed that a rectangular wave AC voltage of 320V and 500V is generated at point d. First, in the half cycle where point a is negative,
The capacitor C ₂ is charged to 320V through the diode D ₁ in the positive direction at one point, and then in the cycle where point a is positive, the capacitor C ₄ is charged to 320V through _{the diode D 2 to} the transformer T. If point g is charged in the positive direction to 1140V, which is the sum of the voltage 820V between the secondary outputs b and d of
_C1 is charged to 2130V, which is the sum of the 1140V charged in the capacitor _C4 and the 990V voltage between the secondary outputs a and b of the transformer T, through the diode _D3 at point h, and then the next a When the point becomes a positive cycle, the capacitor C ₃ connects the voltage between the secondary output e and a of the transformer T to the 2130V charged in the capacitor C ₁ through the diode D ₄ so that the i point is in the positive direction.
The battery is charged to 2620V, which is the sum of 490V, and this becomes the output voltage of this voltage doubler rectifier circuit. It can be seen that by providing an appropriate intermediate tap on the secondary output winding of the transformer T and combining these taps, delicate voltage settings are possible. By connecting one or more capacitors in series or parallel to each of these output terminals and appropriately combining them, one or more arbitrary output voltages can be set.

FIG. 2 shows an example of this combination. That is, a rectangular wave AC voltage generation source E is connected between both ends of the primary winding of the transformer T. The secondary winding of the transformer T has output terminals a, e and intermediate taps b, c,
d is provided. This intermediate tap point C is grounded and connected in series with multiple diodes.
D ₁₁ , D ₁₂ , D ₁₃ , D ₁₄ , D ₁₅ , D ₁₆ , D ₁₇ , D ₁₈ ,
The anode side f of D ₁₉ , D ₂₀ , D ₂₁ is connected, and the cathode side q of these diodes D ₁₁ to _{D 21} is connected to the output side C
connected to. A capacitor C 11 is connected between the connection point n of the diodes D ₁₈ and D ₁₉ and the output terminal a, and a capacitor C ₁₂ is connected between the connection point n and the connection point P of the diodes D _{20 and} D _{21 .} is connected.
A capacitor C ₂₁ is connected between the connection point h of the diodes D ₁₂ and D ₁₃ and the intermediate tap point b, and a capacitor C ₂₂ is connected between the connection point K of the diodes D ₁₅ and D ₁₆ . is connected. A capacitor C31 is connected between the connection point i of the diodes D13 _{and D14} and the point f, and a capacitor _C31 is connected between the point i and the diode
A capacitor C ₃₂ is connected between the connecting point l of D ₁₆ and D ₁₇ , and a capacitor C ₃₃ is connected between the l point and the q point. The diodes D ₁₄ , D ₁₅
A capacitor C ₄₁ is connected between the connection point j and the point d.
A capacitor C 42 is connected between the point j and the connection point m between the diodes D ₁₇ and D ₁₈ , and a capacitor C ₄₂ is connected between the point m and the connection point o between the diodes D ₁₉ and D ₂₀ . ₄₃ are connected. A capacitor C ₅₁ is connected between the connection point g of the diodes D ₁₁ and D ₁₂ and the output terminal e point. The output end A is connected to the i point, and the output end B is connected to the l point.

In other words, if the intermediate tap C point of the transformer T is grounded G, the output terminals a, b, d, and e of the transformer T have voltages of 415V, 320V, and 320V, respectively, relative to point C.
Assume that square wave AC voltages of 200V and 500V are generated. First, considering the output terminals G and A of this circuit, the output terminals b and e of the transformer T, the diodes D ₁₁ , D ₁₂ , D ₁₃ and the capacitors C ₂₁ , C ₃₁ ,
It can be seen that a one-stage voltage doubler rectifier circuit is constructed by _C51 . Therefore, the output terminals G and A of this circuit
A voltage of 1640V, which is twice the voltage of 820V between output terminals b and e of the transformer T, is generated between them. Similarly, between output terminals A and B of this circuit, one-stage voltage double rectification is performed by output terminals b and d of transformer T, diodes D ₁₄ , D ₁₅ , D ₁₆ and capacitors C ₂₂ , C ₃₂ , and C _41. Since the circuit is configured, these output terminals A and B
A voltage of 1040V, which is twice the voltage 520V between the output terminals b and d of the transformer T, is generated therebetween, and a voltage of 5140V is generated at the output terminal B with respect to the ground potential G.

As described above, arbitrary multiple outputs, which could conventionally be realized only by a combination of multiple transformers and multiple rectifier circuits, can now be easily configured by combining with one transformer with an appropriate intermediate tap.

Further, the connection between the intermediate tap C of the transformer T and the group of diodes is not necessarily limited to the point C, but can be arbitrarily selected as long as it is the contact point between the output capacitors C ₃₁ , C ₃₂ , C ₃₃ and the diodes. In this case, depending on where the grounding point is selected, the withstand voltage between the primary and secondary of the transformer T or the capacitors directly connected to the output terminal of the transformer T (in the case of Fig. 2, C ₁₁ , C ₂₁ , C ₂₂ , _C41 , _C51 )
Although the withstand voltage requirement of the circuit is changed, the operation is exactly the same, and the voltage between the output terminals of the circuit is also kept the same.

As is clear from the above explanation, the multi-voltage rectifier circuit with the above configuration connects one of intermediate taps b and c provided on the output winding of the transformer T to the reference potential point of the multi-voltage rectifier circuit (in the figure). capacitor C1, which is connected to taps a and b on one side.
C2 (C11, C12, C21, C22) and the capacitor C4 (C4
1 to C43, C51) alternately enter a charging/discharging state to charge the output capacitor C3 (C31 to C33), resulting in a full-wave rectified output. As a result, ripple voltage can be suppressed and load response can be improved compared to a circuit configuration in which one end of the output winding is connected to a reference potential point to provide a half-wave rectified output.

〔Effect of the invention〕

As described above, according to the present invention, a plurality of intermediate taps are provided on the output winding of the transformer combined with the multiplier rectifier circuit, one of the intermediate taps is connected to the reference potential point, and the other taps are connected to the reference potential point. By combining the different voltages obtained, it is possible to set any output voltage, and even when obtaining multiple outputs from one multiplier rectifier circuit, the ratio between the output voltages can be set arbitrarily. A rectifier circuit can be provided.

[Brief explanation of drawings]

Figure 1 is a circuit diagram showing one embodiment of the present invention, Figure 2 is a circuit diagram showing an embodiment of the present invention.
The figure is a circuit diagram showing another embodiment of the present invention. T...Transformer, _D1 ~ _D4 , _{D11 ~ D21} ...Diode, _C1 ~ _C4 , C11, _C12 , _C21 , _C22 , _C31 , ~
C ₃₃ , C ₄₁ to C ₄₃ , C ₅₁ ... Capacitors.

Claims (1)

[Claims] 1. The output winding is provided with a plurality of intermediate taps,
One intermediate tap is connected to a reference potential point and serves as a reference tap, the tap on one side of the reference tap serves as the first output tap, and the tap on the other side serves as the second output tap. A transformer and multiple diodes are used. The plurality of diodes are connected in series so that their rectification directions are the same, and one or more diodes are connected in series with a diode circuit in which one end of one of the plurality of diodes is connected to the reference tap. an output capacitor whose end is connected to the reference potential point and which is connected in parallel to three or more diodes of the diode circuit; a first capacitor connected to the first output tap; and a second capacitor provided for each second output tap, one or more of which are connected in series, and one end of which is connected to the second output tap. and a capacitor, the other end of each of the first and second capacitors being alternately connected to a connection point to which the output capacitor is not connected among the connection points between the diodes of the diode circuit. A multi-voltage rectifier circuit featuring: