JPS605144B2 - power transfer device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a power transfer device that transfers constant power from a power source to a load regardless of load conditions.

Conventionally, as shown in FIG. 1, this type of power transfer device is inserted in series with a transformer T and the primary winding TP of the transformer T.
A configuration consisting of a switch S, a diode D, and a capacitor C, which is turned on and off at a predetermined cycle by a pulse signal P from a control terminal CT, is adopted.

In addition, the polarity relationship between the primary winding TP and the secondary winding Ts of the transformer T is indicated by dots, and when the switch S is turned on, the power input from the power source B is transferred to the primary winding. Line T
When applied to P, a negative electrode is generated on the diode ○ side of the secondary winding Ts, and at this time, since the diode D is inserted in series in the non-conducting direction, current flows through the secondary winding Ts. First, the primary winding TP of the transformer T acts as an inductance, and electric power is stored here as electromagnetic energy.

Here, if the inductance of the primary winding TP is L, the on-time of the switch S is ton, and the voltage of the power source B is E, then the power Pc accumulated in the transformer T is given by the following equation.

PCi left・E2-other・------t11 This power P
c is the secondary winding Ts when the switch S is turned off.
Since the electromotive voltage of is in the normal direction with respect to diode D,
It is discharged to the capacitor C side, thereby supplying power to the load LD.

Note that the ripple component of the current IL flowing through the load LD' is removed by the action of the capacitor C, and the current IL flows as a direct current. Further, if the frequency of the period in which the switch S turns on and off is f, the power Pout transferred to the output side of the transfer circuit per second is expressed by the following equation.

Pout: Ayumu-E2-■n2-f-------[
21 Therefore, if the frequency f is constant, a constant power Pout is always transferred to the output side. In addition, switch S
If the off time is ff, then f:1/■n+toH)
．．・…．・．．・Since the relationship '3} holds true, the equation {21] can also be expressed by the following equation.

・ Pout = car.

E2 佽2-■n+ Teacher--.・-． ...[4} However,
In the configuration shown in Figure 1, the primary winding TP that stores power
Since the secondary winding Ts and the secondary winding Ts that emit power are separate, a close electromagnetic coupling is required between the two windings TP and Ts.For this, a high quality transformer T must be used, which is expensive and expensive. The present invention has the purpose of fundamentally solving these drawbacks of the conventional technology, and has an extremely rational structure that achieves the same function as the conventional method with an inexpensive structure by using a simple blocking wire. The present invention provides a power transfer device based on the above-mentioned characteristics.

Hereinafter, the details of the present invention will be explained with reference to FIG. 2, which shows an embodiment.

FIG. 2 is a circuit diagram showing a basic embodiment, in which a first switch is connected to the input side of the blockage line logic CL inserted in series into the power supply circuit between the input terminal 1 and the output terminal 3. S, is inserted, and a second switch S2 is inserted between both lines of the power supply circuit between the input terminal blade 2 and the output terminals 3 and 4 on the output side of the flow line theory CL, Each switch S,,
S2 is turned on and off simultaneously by a pulse signal P applied from a control terminal CT.

Therefore, when each switch S, , S2 is on, the power input from power supply B is applied to the blockage line theory CL via each switch S, , S2, and the inductance of the same line theory CL is 1, If the ON time of each switch S, S2 is n, then the power Pc shown in equation {1) is accumulated in the flow line theory CL. Also, if each switch S., S2 is turned off, The power Pc accumulated in the flow line L is transferred to the first diode D inserted between the input side of the flow line CL and between both lines of the power supply circuit, and the output side of the flow line CL. A forward electromotive force is generated for the second diode D2 inserted in series with
It is discharged to the load LD side via each diode D, , D2, and supplies current IL.

Note that the first switch S, may be inserted into the power supply circuit between the input terminal 2 and the output terminal 4, and as shown in FIG. Even if it is inserted into another line, the same results as in Figure 2 can be obtained. FIG. 4 shows each switch S, ? As S2, transistors Q with opposite polarity are used.
,,Q2 is used.In this example, an inverter GI is inserted into the transistor Q, and transistors Q,,Q2 are turned on and off at the same time.If configured as shown, the transistor Q ,, Q2 emitters are all connected to output terminal 4, so output terminal 4
The transistors Q, Q2 can be easily controlled by the pulse signal P having the side as a reference potential.

Note that the pulse signal P is turned on at a predetermined period.
Any device can be used as long as it performs off control; for example, the output of an astable multipipulator or the like can be used. However, due to the operational response time difference between each switch S, , S2, while the first switch S, is on, the second switch
When the switch S2 is turned off, the load Lo receives the current IL from the power source B, in addition to the current IL associated with the release of the power accumulated in the flow line theory CL in response to the turning off of the second switch S2. If the purpose is to always supply a constant power to the load LD through the first switch S, which is the same as the first switch S, an error will occur.

FIG. 5 is a circuit diagram showing an embodiment in which the occurrence of such errors is completely prevented. Control terminals CT, CT2 are individually provided for each switch S, , S2, as shown in FIG. 6. Each switch S, , by the related pulse signal P, , P2
It controls S2.

That is, if the second switch S2 is turned on by the pulse signal P2, which is obtained by adding a margin period tta2 to the period tc during which the first switch S is on, the occurrence of an error is prevented by the margin period t. At the same time, in the margin period ta2 after the power storage period tc, the second switch S2
The power accumulated by the circuit of the diodes D and D is stored, and if this circuit is made lossless, there is no power consumption and it is released during the period ts when the second switch S2 is off, so no errors occur. . Therefore, if the switches S, , S2 are controlled by setting a period in which they are simultaneously turned on, the essential purpose can be achieved, but as shown in FIG.
As a relationship that includes the period during which switch S is on,
By determining the period during which the second switch S2 is on, a certain amount of power can be accurately transferred to the load LD.

FIG. 7 shows an example of a circuit that generates the pulse signals P, P2 shown in FIG. 6, and the output of the pulse generator PG is shown in FIG. a, and delay time t by delay circuit DL.
By applying the delayed output b delayed by d to the AND gate G, and taking out the output c, a pulse signal P is obtained,
By applying the output a and the delayed output b to the OR gate G2 and taking out the output d, a pulse signal P2 is obtained.

Note that each switch S, S2 is a transistor Q.
.

Further, the present invention can be applied to various circuits that require a constant supply of power, and is particularly suitable for application to a current supply circuit to terminal equipment in an exchange.

As is clear from the above description, according to the present invention, a constant amount of power can be transferred with a simple and inexpensive configuration, and therefore great effects can be obtained in power transfer for various uses.

[Brief explanation of the drawing]

Fig. 1 is a circuit diagram of a conventional example, Fig. 2 and subsequent figures show embodiments of the present invention, Fig. 2 is a basic circuit diagram, and Fig. 3 shows the first switch on the side opposite to the blocking wire ring. Figure 4 is a circuit diagram when a transistor is used for each switch, Figure 5 is a circuit diagram when a constant power is transferred accurately, Figure 6 is a circuit diagram when it is inserted into a power line, and Figure 6 is a circuit diagram when a transistor is used for each switch. 7 is a block diagram of a circuit that generates the pulse signal of FIG. 6, and FIG. 8 is a time chart showing waveforms of various parts in FIG. 7. 1, 2...Input terminal, 3, 4...Output terminal, CL...
...Block line theory, S. ...First switch, S2
...Second switch o Fig. 1 Fig. 2 Fig. 3 Fig. 4 Fig. 5 Fig. 6 Fig. 7 Fig. 8

Claims (1)

[Scope of Claims] 1. A blockage wire inserted in series into a power supply circuit, and a first switch which is inserted in series into an input side of the power supply circuit and repeatedly turns on and off at a cycle according to the transferred power. , providing a period in which the first switch inserted into the output side of the blocking wire ring and between both lines of the power supply circuit is turned on at the same time;
a second switch that is repeatedly turned off; A power transfer characterized by comprising a first diode inserted between both lines, and a second diode inserted in series to the output side of the blocking coil in the forward direction with respect to the electromotive force. Device. 2. The power transfer device according to claim 1, wherein the first switch is provided on the line into which the blocking wire is inserted. 3. Claim 1, characterized in that the first switch is provided on the other line on the opposite side to the one line in which the blocking line is inserted.
The power transfer device described in Section 1.