JPS58159663A - Power source circuit - Google Patents

Abstract

PURPOSE:To eliminate irregular magnetization of a power conversion transformer by independently forming two secondary coils of the transformer, rectifying the outputs of the coils, and supplying the load current through separate choke coils. CONSTITUTION:A DC power applied to input terminals 1, 2 is converted to AC power when transistors Q1, Q4 and Q2, A3 are alternately turned ON and OFF, and outputted from the secondary coils S1, S2 of a transformer T. The secondary output is rectified by diodes D1-D4, smoothed by choke coils L1, L2 and condenser C3 and outputted from output terminals 3, 4. In this manner, it becomes equal at the products of the voltage applied to the primary coil of the transformer T and the applying time in each period, and irregular magnetization of the transformer T can be eliminated.

Description

Detailed Description of the Invention This JI4 #4 is a full bridge #4 for large current output.
The present invention relates to a power supply circuit including a DC-DC converter circuit.

Conventionally, this type of power supply circuit is K111 as shown in Figure 1.
will be accomplished. That is, the positive and negative 11i sources are connected to the input shoulders 1 and 2, and the transistor Qt- is formed by the first and second switching elements, which are turned on and off complementary to the signal #.
Q Goose series W7! A series connection circuit of a connecting circuit and a transistor Q='Q4, which is a similar switching element, is connected between the positive and negative power supplies. A capacitor C3 is connected to the input terminals 1 and 2, if necessary. And Condan tc
, and the primary winding 1aP of the power conversion transformer T.
t(') series connection point with the collector and the transistor Q,
A direct connection between the emitter of the transistor Q4 and the collector of the transistor Q4 is established. The paces of transistors Q and -Q4 are connected to t1 gate terminals 5 to 8, respectively, and gate terminal 5
, 8 and the gate terminal 6.7 are alternately supplied with active pulses. Transistors Ql, Q according to the control pulse
4 or transistors Qt and Qa pass 4 to alternating voltage and flow into the primary *-P of transformer T (reverse to alternating voltage. That is, the direct ctt force marked 710 at input terminals 1 and 2 is father flL (transformed by force and output from the secondary winding S of F lance T.

2s 1! The midpoint of the F edge S is connected to the negative output terminal 4,
2nd -1! Flll! IQ and if of S are ftcd to the anodes of diodes D, , D, respectively. Diode D,, D.

Canodes are common! The output terminal 8 is connected to the positive output terminal 8 through the output coil Lt. A capacitor C3 is connected to outputs 1 and 4. That is, the diode Dl*DB* is connected to the coil, and the capacitor C3 and the like constitute an output circuit that outputs the secondary winding output t-m.

The conventional circuit described above includes transistors Q, ~Q.

In order to prevent biased magnetization of the transformer T, which is caused by variations in the switching percentage of The disadvantage of 64. is that the excitation #IL flow is not sufficient for rounding, which depends only on V, and lacks stability. For this reason, the switching element may be destroyed.
In order to realize a Km circuit with a large electric waterfall output that requires 4 waves of output of t amperes, K requires diodes D, D, choke coil Lri, several 6 amperes (Takiyo Sumire), and elements There are major difficulties in the manufacture of transformers and circuit coils.Also, even if Kglml diodes are installed in parallel to reduce the trough ratio of each individual diode by half, the difference in diode percentage will cause labor shortages. There are problems such as the current does not become negative and a current of more than A flows through one of the diodes.

The first object of the present invention is to solve the above-mentioned conventional drawbacks and to
It is likely that the power conversion transformer will become energized due to the difference in the conduction time of the switching elements of the pair, and therefore the switching elements will not easily break or break, providing a stable source recovery. Moreover, the second object of the present invention is the output IIi! 1
The purpose of the present invention is to provide a power supply circuit FR that can halve the current flowing through the circuit's diodes and cross-coils. Furthermore, the eighth object of the present invention is to connect the candes of all the diodes of the output g4 rectifier circuit in common, so that there is no need to insulate the heat sink from all diodes, and in some cases, the heat sink itself can be connected to one positive output pole. The actual table is easy to use so that it can be used as
There are K to provide a T source circuit.

The C-eikyu pongee of the present invention has a series connection circuit of first and second switching elements that are connected to the positive and negative gates and turned on and off by biased magnetism, and a similar 5148 and fourth switching element. 114 switching elements in series, a series connection point of the first and second switching elements, and the eighth and fourth switching elements.
A series connection circuit of a capacitor and a primary winding of an intra-area conversion transformer connected between the switching element of the switching element and the primary winding of the power conversion transformer, and an output circuit that aligns the secondary winding output of the power conversion transformer (In the source circuit, the secondary 4 of the power conversion transformer has the same number of windings 1 and 1.
1202 secondary winding II #, and the respective anodes ft are connected to the winding beginnings of the 1st and 2nd 8th windings and *S:V.
The continuous cand is connected in common with the 4111 diode connected to the positive output terminal Kmd, the negative output terminal and the 2nd one of Ichiki ml.
Next winding=! ! ! The first device connected to the end threshold
The second chiller coil connected between the negative output terminal and the beginning of the second secondary*mO winding, and the capacitor connected between the member output terminal. I will wait.

Next, one embodiment of the present invention will be explained in detail with reference to the drawings.

FIG. 2 is a circuit diagram showing one implementation of the present invention. In this contribution example, transistors QI, Q! .

Ql#Q41 Condenser length ct, D power conversion transformer T 1
The next vF line P etc. are the same as in the conventional example shown in FIG. 1, and a capacitor C1 is connected between input terminals 1 and 2 as necessary. However, the 8th winding of the power conversion transformer T is composed of the first secondary winding SI and the 8th winding -8, each having the same number of turns. The anodes of diodes D1 to D4 are connected to the beginning 2 (marked - in the diagram) and the end K of each of the first winding S and the second winding S0, respectively.

The cathodes of ~D are connected to the common Km and are connected to the positive output terminal 8. Negative output terminal 4 and key Kiyoshi 1, 2-way 48,
No-I! A choke coil L1 is connected between the negative output terminal 4 and the second secondary 4k 1iki S.
Connect the chiller coil L to f7f of t.

A capacitor C8 is connected to the output terminals 8 and 4 thresholds. In the heather embodiment, as described later, the transistor Q
1. Even if there is a difference between the on period of Q4 and the on period of transistors Q, Q, biased magnetization of the transformer T will not occur, enabling stable operation and preventing destruction of the switching element (transistor). In addition, the current flowing through the diodes D, ~D4 and the lead coil Ll, LIK is the same as the current flowing through the diodes D, .
It is caused by the amount of current flowing through D. In other words, it is effective to obtain a large current output with a diode or choke coil of small amount. Diode D is used for this purpose.

It is not necessary to select those with exactly the same percentage of ~D.
Furthermore, since the cathodes of the diodes D1 to D are all connected in common, there is no need to insulate the diodes from the diodes in the heat sink. It is a turning part to attach the canard directly to the door link. In addition, it is also possible to use the single unit itself as a positive output terminal, making it easy to perform and cooling 5cb.
Rice also has the effect of being large.

Next, the production of four real J1m moths and the reason why biased magnetization does not occur will be explained. The n±tL current power applied to the input electrons 1 and 2 is converted to 5eR power by turning on and off the transistors Q1 and Q4 and the transistors Q and Qs, and the secondary winding of the transformer T. 8, and S. The secondary output is rectified by diodes D, -D4, smoothed by choke coils L, , L, and capacitor C8, and output from output tubes 8, 4.

Assume that the four suitable times t1 for the transfer transistors Qt and Q,
Let t be the conduction time of the transistors Q, , Qa. In addition, these repeated pigeon periods are designated as T.

And the voltage drop F of the transistor Q, ~Q4, the transformer T, the diode D, ~D4+fs-coil L,
・L! For convenience, we ignore the step-down F of →, and 2 of transformer T.
NextfiI@S lノ'll [Pressure V,,,S! Next winding 8tO kVa*, voltage across capacitor C8 is vo
Then, when the transistors IQt and Ql are conductive, the AC components ΔILt and ΔIL of the DC current I ILl flowing through the choke coils L, , L are as follows: ΔILI = (VPr Ve ) t+/L+
・・・・Old・・・−(1)) When j7 resistor Q,・Q is non-conducting, Δ■i−Vo(T−t+ )/L+
・・・River・・・・・・・・・・・・(2) Transistor Q
When I and Q4 are conductive, Δ■I-(vlls Ve
) tt/Lt・・・・・・・・・・・・・・・(3
) When transistor Q,' Q4 is non-conducting, Δ 1□
-Vo(T tt)/Lm ---・Su...
Ladle・(4) Deruru, l & the above formula - This 2 has the sign L+, L
The arrow is intended to represent the inductance value of the 4-1 coil LH+Lt. Bo'lli! In the operating state, equations (1) and (2) are equal, so VI+, -v・T/l, ...... River...
・・・・・・River・・・・・・(5,1111111K, Val-=v・T/lt・・・・・・・・・・・・・・・・・・
・Machi・・・・・・・・・It is a mouse. ! I! Rite.

vll ' t = Vgg t 1 town...
・・・・・・・・・・・・・・・(7) becomes,! Next 4
1m81 and S *ノ'f! l'a 11, i! /
' Etc. When transistors Q* and Q are turned on, one kennel of transformer T - tf k V
p r, and when transistors QI and Q4 are on, the primary #! of transformer T! ! If the voltage applied to ist is V□, then
1 Kennel line voltage V□.

A similar relationship holds true for VpxK as well. In other words, Vp+! +-vpg! t・・・・・・・・・
Offer・・・・・・・・・・・・・・・(8) Now, the first round of Bok2ns T! When the applied voltage is a rectangular wave, the magnetic flux density of t2/score is proportional to the product of the applied voltage and the application time. Therefore, equation (8) is) The magnetic flux generated in the transformer core during the conduction time of 7
This means that the magnetic flux generated by being magnetized in the opposite direction Km during the entire period is equal, and even if the conducting times t and t are not equal, biased magnetization will not occur. Therefore, there is an effect that 1ia will not occur due to differences in the customization of transistors Q and -Q, unequal lengths of control pulses, etc. That is, there is no risk of becoming unstable due to saturation of the transformer core and destroying the transistor Q+"Q44+.

is balanced with the sum of 1g1i2ilii voltages. on the other hand,
Conde 7TC to 48Mn5 of transistor Q+/Q4!
ta flowing into the capacitor C7 is assumed to be l, and the lightning flowing out from the capacitor C7 when the transistors Qt and Qi are conductive is 1. Then, 1, t, = i, t, ・・・・・・・・・・・・・・・
・・・・・・・・・・・・・・・・・・(9), -10,000 @ki (7), (8) formula is Naraku coil L
It is unrelated to the current value lacking in 1・L, so the circuit in Figure 2 is as follows, so that equations (7) and (8) hold true.
This means that the sharing ratio changes freely within the range where the sum (load current) of the voltage of the check coils L, , L, is constant, but the lightning value of the check coils L, , L, 1 /
t flow 1. It can be seen that ,i, ultimately takes the direct form determined by
1 appears as the difference between the ignition and the ignition regions of the capacitor C, and this determines the load sharing. On the other hand, since the voltage applied to the primary winding of Tokunsu T during each period satisfies the relationship Jt of equation (8), no biased magnetization occurs.

In the above description, the value of the capacitor C2 does not depend on the operating principle of the present invention, but the value of the capacitor C2
If the value of , is too large, it may take one hour to reach stable operation, and an excessive amount of force may be applied to transistors Q1 to Q when the input screw pressure or output current is low. There is. Conversely, if capacitor C2 is too small, the primary (
As the accent approaches a sine wave and the peak ta increases, the load on the transistors Q and -Q increases.

In addition, the current flowing through the check coil L, L is approximately half of the negative #WILIL, and furthermore, the diode D,
The lightning that falls on ,D is equal to the electric current fiK across the choke coil LIVc. The current of diodes D, D4 is nara-
Kucoil L! Therefore, these mizuko have the effect of requiring half the current capacity compared to conventional C sweets. For this reason, it is not necessary to make the diodes D and -D4 uniform in percentage.

Moreover, since the candes of diodes D and D4 are all connected in common, when attaching a heat sink, it can be directly attached to one pole of the diode. Of course, this heat sink can also be used as an output terminal. Therefore, there is an effect that implementation becomes easy.

As described above, in the present invention, two secondary windings of the power conversion transformer are provided independently, and the output of each winding is maximized to supply the load current through a separate Naraku coil. Since it is configured, the first order of the penalty power f-conductor −@N
The product of the voltage applied to VC and the application time is equal in each period, which has the effect of not causing IJii magnetism in the power conversion transformer. Therefore, stable operation is possible and the switching cables are not damaged. Also, the above two
Load power is supplied from the next winding output by a separate check coil.
Since #L falls flowing through each Naraku coil, the load current will be approximately half of that of the #L waterfall flowing through each Naraku coil. And each! 11EaE4 wheels are affected by the diode, so there is no need to threaten the diode attachment, so it is easy for Mizuko to move. In addition, since the catodes of each diode are all wired in common, it is necessary to connect each diode directly to one heat sink, and furthermore, it is necessary to connect the main wire as the output terminal of the heat sink. I can get hired. In other words, it has the effect of making it easy to select one part and making it relatively easy to rearrange the costume.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram (b) showing the advantages of a conventional full-bridge type OKm circuit, and FIG. 42 is a circuit diagram showing one example of the present invention. In the figure, l, 2...input terminal, 8, 4...output terminal, 5-8...game? 4 children, C5-C8...Condensation t%Ql-Q490. )9 transistor, T...power conversion transformer, D, ~D,...diode, 'L, L
I, Lx...Te1-tacoil, P...Primary volume of power conversion transformer-1S, S,,S,...Secondary volume of power conversion transformer-0 Agent Shun Sumita, Physician So diagram 1

Claims (1)

[Claims] The series connection dI of the first and m2 switching elements connected between the positive and negative power supplies and turned on and off in a complementary manner (according to the control signal)
g1wlr, a series connection (b) path of similar eighth and fourth switching elements, a series connection point of the first and second switching elements, and a series connection point of the 1s8 and 44 switching elements. A direct connection circuit for the primary winding of the capacitor and the quality reformer transformer connected to the
In the power supply circuit, the power conversion transformer includes a secondary winding output and an output circuit, wherein the secondary winding of the power conversion transformer is composed of first and second secondary windings having the same number of turns. Four diodes are connected to the positive output electrons with their anodes connected to the beginning and end of the winding of the cough ml and the second secondary winding, and the cathodes are connected in common to the positive output electrons, and the negative output electrons are connected to the negative output electrons. a first Chiroku coil connected between the winding end of the first secondary winding, a negative output terminal and the III'
Broom 2 connected to the beginning of the secondary volume of i42 and 0n4Wc
What is claimed is: 1. A power supply circuit comprising: a first coil and nine capacitors connected to the positive and negative output thresholds.