CA1206521A - Current supply circuit - Google Patents
Current supply circuitInfo
- Publication number
- CA1206521A CA1206521A CA000429483A CA429483A CA1206521A CA 1206521 A CA1206521 A CA 1206521A CA 000429483 A CA000429483 A CA 000429483A CA 429483 A CA429483 A CA 429483A CA 1206521 A CA1206521 A CA 1206521A
- Authority
- CA
- Canada
- Prior art keywords
- supply circuit
- current supply
- converter
- mode
- switched
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/337—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only in push-pull configuration
- H02M3/3372—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only in push-pull configuration of the parallel type
- H02M3/3374—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only in push-pull configuration of the parallel type with preregulator, e.g. current injected push-pull
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
ABSTRACT:
The input of a current supply circuit which com-prises a non-controlled switched-mode converter as a d.c.
voltage converter is connected to a direct current source.
A controllable switch which is pulse-width controlled by a controller is arranged in parallel with the input of the d.c. voltage converter. This switch and controllable switches provided in the switched-mode converter are con-trolled such that they are never simultaneously conductive.
The input of a current supply circuit which com-prises a non-controlled switched-mode converter as a d.c.
voltage converter is connected to a direct current source.
A controllable switch which is pulse-width controlled by a controller is arranged in parallel with the input of the d.c. voltage converter. This switch and controllable switches provided in the switched-mode converter are con-trolled such that they are never simultaneously conductive.
Description
PHT. 82.319 The invention relates to a current supply circuit comprising a non-controlled switched-mode converter as a d.c. voltage converter with a transformer and also at least a controllable switch and a controller for pulse-width control.
In the periodical Elektronik, 1978, Vol. 4, pages 102-107 several current supply circuits are des-cribed which comprise a d.c. voltage converter. There are two basic types of d.c. converters: the blocking oscilla-tor and the switched-mode type. The push-puIl converter is a special type of switched-mode converter.
With all types of d.c. converters the input volt-age is chopped by means of a switching transistor. The square wave voltage thus obtained is transformed by means of a transformer and subsequently rectified and filtered.
The filtered output voltage of the d.c. converter is stabilized because of the fact that the duty cycle of the square-wave voltage is controlled by means of a control cirouit. Fluctuations of the voltage to be transformed or of the load resistor to which the filtered output voltage is applied consequently effect a change in the du*y cycle.
This control of the duty cycle is alternatively denoted puIse-width control.
In the transmission technique, current supply circuits which are remotely fed v a line from a d.c.
source are used in terminal equipment and repeaters. Such a remote supply by means of a d.c. voltage as the remote supply source is effective up to a line length of approx-imately 2 km as the voltage losses alony the line then still remain within acceptable limits. If in contrast therewith voltage must be supplied over a longer distance up to, for example, 130 km, as is often the case in the transmission technique the d.c. voltage source is replaced by a a.c. source which sends a constant current through the remote-supply line to the individual load or loads, for example, repeaters. When several loads are fed from the same remote-supply source then all loads are arranged in !., ~
` ~Z~i~SZl PHT. 82.319 2 series with the current source when a direct current source is used, while when a d.c. voltage source is used they are arranged in parallel with the voltage source. To ensure that the voltage losses along the line remain low, the current must be small. Consequently, when a voltage source is employed as the energy source, a high voltage is advan-tageous whereas when a current source is used as the energy source a small current is advantageousO When for the supply from a current source different currents are required, a current supply circuit which converts the remote supply voltage into the operating current for the load is provided for each load.
The current supply circuits described in the above-mentioned periodical are however not so suitable for con-verting a current produced by a direct current source intoa higher current, as when the circuits are used thus a reduction of the load~at the output causes the input resis-tance and consequently also the input power to be increased instead or to be decreased. As a result thereo~ they have a comparatively high dissipation.
The invention has therefore for its object to provide a current supply cirauit which has a comparatively low dissipation when supplied from a direct current source.
This object is accomplished, according to the invention, by a current supply circuit comprising a non-controlled switched-mode converter as a d.c. voltage converter with a transformer and also at least a control-lable switch and a controller for pulse width control, characterized in that the input of the d.c. voltage con-verter is connected to a direct current source, that afurther controllable switch, which is pulsed-width con-trolled by the controller is~arranged in parallel with the input of the d.c. voltage converter and that the control-lable switches~are controlled such that they are never simuItaneously conductive~
An advantageous embodiment of the invention con-sists of a current supply circuit wherein the d.c. voltage converter is a single-end switched-mode converter and the 120652~
PHT. 82. 319 3 controllable switch of the single-ended switched-mode con-verter is controlled in the push-pull mode compared with the further controllable switch.
The invention will now be described in greater detail by way of example with reference to drawings, in which:
Flg. 1 shows a first embodiment of a current supply circuit according to the present invention and Fig. 2 shows a second embodiment of a current supply circuit according to the present invention.
In the embodiment shown in Fig. 1, the d.c. con-verter is in the form of a single-ended converter Gl. One side of the current source Q is connected to the collector of a transistor T2 via.a choke DR and the other side to 15 the emitter of the transistor T2. A series.arrangement formed by the primary winding of a transformer U and the collector-emitter path of:a transistor Tl is arranged in parallel with the collector-emitter path of the transistor T2. The terminals of the secondary winding of the trans-20 former U:are interconnected.via a series-arrangement of a diode Dl:and a capacitor C. Connected in parallel with this capacitor C are the output A of the current supply circuit and the input of:a con.troller R, whose output is connected to both the base of the transistor T2 and, via an 25 inverter I, to the base of transistor Tl.
The transformer U, the diode Dl, the capacitor C
and also.the transistor Tl provide a non-controlled, sin.gle-ended converter without storage choke in the output circuit. Its mode of operation will not be described in detail here, as it is already sufficiently known from the :above-mentioned periodical.
The duty cycle of the square-wave.voltage for the transistors Tl and T2 is chan.ged by means of the controller R. The controller R directly drives the transistor T2 and 35 the transistor Tl via:the in.verter I, so that the two tran-sistors are operated in the opposite phase. As transistor Tl conducts - the transistor T2 is then in the non-con.ductive state - the current source Q applies energy to ~ZI~GSZl PHT. 82.319 4 the d.c. voltage converter Gl. Since the transistor T2 conducts during the non-conducting state of the transistor Tl, the current source Q is not operated in the no-load mode but, when the line resistance is disregarded, is short-circuited. The two transistors must not both be in thenon-conductive state simultaneously, but they may conduct simultaneously. Consequently no high voltage can build-up at the input of the current supply circuit, as would occur in no-load operation, so that the dissipation of the current supply circuit and consequently also the load on the current source remain low. For a better understanding of the way in which the invention functions it should here be borne in mind that a voltage source~and a current source, both when short-circuited~and operated in the no-load mode are loaded differently: a voltage source is absolutely not loaded when operated in the no-load mode, but is highly loaded when short-circ,uited. For a current source this is just the other way around. A current source is loaded very highly at~a high-~mpedance load, whereas it is absolutely not loaded when short-circuited.
The choke DR has for its object to prevent cur-rent peaks in the transistors Tl and T2 and sudden voltage transients on the line, which may occur during switching of the two transistors due to parasitic line capacitances.
Without the choke DR the line to the current source Q were consequently not interference-free, the current source Q
would in that case be connected to a not nonreactive current supply circuit.
Fig. 2 shows a second embodiment of the invention, in which the d.c. voltage converter is a push-pull switched-mode converter.
Arranged in parallel with the poles of the direct current source Q is~a series arrangement formed by a choke DR and the collector-emitter path of a transistor T2, whose emitter is'connected to the emitters of two further tran-sistors Tl and T3. The collectors of the two transistors Tl and T3 are interconnected via the primary winding of the transformer U, whose cen,tre tap is connected to the collec-'.,~'~
` lZ~6521 PHT. 82. 319 5 tor of the transistor T2. The terminals of the secondarywinding are interconnected via two oppositely poled diodes Dl and D2. A capacitor C is arranged between the junction of the two diodes Dl and D2 and the centre tap of the secondary winding, the output A of the current supply circuit and also the input of the controller R are arranged in parallel with this capacitor. The base of the transis-tor T2 is connected to the output of the controller R. The bases of the other transistors Tl and T3 are connected to a pulse generator TG, which controls them in t}le push-pull mode with a square-wa~e Yoltage whose duty cycle is 1/2.
The frequencies of the controller R and the pulse generator TG are in synchronism... The push-pull converter is pro-vided by the transformer U, the transistors Tl and T3, the diodes Dl and D2 and the capacitor C. Its mode of opera-tion is described in the:above-mentioned periodical.
The transistor T2 i5 pulse-width controllçd by the controller R. As long.as this transistor is in the non-conductive state, the.remote-supply voltage flows from the current source Q either.via the transistor Tl or T3 in the primary circuit of the.transformer U,:as the two tran-sistors Tl and T3:are controlled in the push-pull mode, so that:always one of them is conductive. The longer the transistor T2 conducts, the lower is the voltage at input E
of the current supply circuit:and consequently the load of the current source~
.~ '` r~
In the periodical Elektronik, 1978, Vol. 4, pages 102-107 several current supply circuits are des-cribed which comprise a d.c. voltage converter. There are two basic types of d.c. converters: the blocking oscilla-tor and the switched-mode type. The push-puIl converter is a special type of switched-mode converter.
With all types of d.c. converters the input volt-age is chopped by means of a switching transistor. The square wave voltage thus obtained is transformed by means of a transformer and subsequently rectified and filtered.
The filtered output voltage of the d.c. converter is stabilized because of the fact that the duty cycle of the square-wave voltage is controlled by means of a control cirouit. Fluctuations of the voltage to be transformed or of the load resistor to which the filtered output voltage is applied consequently effect a change in the du*y cycle.
This control of the duty cycle is alternatively denoted puIse-width control.
In the transmission technique, current supply circuits which are remotely fed v a line from a d.c.
source are used in terminal equipment and repeaters. Such a remote supply by means of a d.c. voltage as the remote supply source is effective up to a line length of approx-imately 2 km as the voltage losses alony the line then still remain within acceptable limits. If in contrast therewith voltage must be supplied over a longer distance up to, for example, 130 km, as is often the case in the transmission technique the d.c. voltage source is replaced by a a.c. source which sends a constant current through the remote-supply line to the individual load or loads, for example, repeaters. When several loads are fed from the same remote-supply source then all loads are arranged in !., ~
` ~Z~i~SZl PHT. 82.319 2 series with the current source when a direct current source is used, while when a d.c. voltage source is used they are arranged in parallel with the voltage source. To ensure that the voltage losses along the line remain low, the current must be small. Consequently, when a voltage source is employed as the energy source, a high voltage is advan-tageous whereas when a current source is used as the energy source a small current is advantageousO When for the supply from a current source different currents are required, a current supply circuit which converts the remote supply voltage into the operating current for the load is provided for each load.
The current supply circuits described in the above-mentioned periodical are however not so suitable for con-verting a current produced by a direct current source intoa higher current, as when the circuits are used thus a reduction of the load~at the output causes the input resis-tance and consequently also the input power to be increased instead or to be decreased. As a result thereo~ they have a comparatively high dissipation.
The invention has therefore for its object to provide a current supply cirauit which has a comparatively low dissipation when supplied from a direct current source.
This object is accomplished, according to the invention, by a current supply circuit comprising a non-controlled switched-mode converter as a d.c. voltage converter with a transformer and also at least a control-lable switch and a controller for pulse width control, characterized in that the input of the d.c. voltage con-verter is connected to a direct current source, that afurther controllable switch, which is pulsed-width con-trolled by the controller is~arranged in parallel with the input of the d.c. voltage converter and that the control-lable switches~are controlled such that they are never simuItaneously conductive~
An advantageous embodiment of the invention con-sists of a current supply circuit wherein the d.c. voltage converter is a single-end switched-mode converter and the 120652~
PHT. 82. 319 3 controllable switch of the single-ended switched-mode con-verter is controlled in the push-pull mode compared with the further controllable switch.
The invention will now be described in greater detail by way of example with reference to drawings, in which:
Flg. 1 shows a first embodiment of a current supply circuit according to the present invention and Fig. 2 shows a second embodiment of a current supply circuit according to the present invention.
In the embodiment shown in Fig. 1, the d.c. con-verter is in the form of a single-ended converter Gl. One side of the current source Q is connected to the collector of a transistor T2 via.a choke DR and the other side to 15 the emitter of the transistor T2. A series.arrangement formed by the primary winding of a transformer U and the collector-emitter path of:a transistor Tl is arranged in parallel with the collector-emitter path of the transistor T2. The terminals of the secondary winding of the trans-20 former U:are interconnected.via a series-arrangement of a diode Dl:and a capacitor C. Connected in parallel with this capacitor C are the output A of the current supply circuit and the input of:a con.troller R, whose output is connected to both the base of the transistor T2 and, via an 25 inverter I, to the base of transistor Tl.
The transformer U, the diode Dl, the capacitor C
and also.the transistor Tl provide a non-controlled, sin.gle-ended converter without storage choke in the output circuit. Its mode of operation will not be described in detail here, as it is already sufficiently known from the :above-mentioned periodical.
The duty cycle of the square-wave.voltage for the transistors Tl and T2 is chan.ged by means of the controller R. The controller R directly drives the transistor T2 and 35 the transistor Tl via:the in.verter I, so that the two tran-sistors are operated in the opposite phase. As transistor Tl conducts - the transistor T2 is then in the non-con.ductive state - the current source Q applies energy to ~ZI~GSZl PHT. 82.319 4 the d.c. voltage converter Gl. Since the transistor T2 conducts during the non-conducting state of the transistor Tl, the current source Q is not operated in the no-load mode but, when the line resistance is disregarded, is short-circuited. The two transistors must not both be in thenon-conductive state simultaneously, but they may conduct simultaneously. Consequently no high voltage can build-up at the input of the current supply circuit, as would occur in no-load operation, so that the dissipation of the current supply circuit and consequently also the load on the current source remain low. For a better understanding of the way in which the invention functions it should here be borne in mind that a voltage source~and a current source, both when short-circuited~and operated in the no-load mode are loaded differently: a voltage source is absolutely not loaded when operated in the no-load mode, but is highly loaded when short-circ,uited. For a current source this is just the other way around. A current source is loaded very highly at~a high-~mpedance load, whereas it is absolutely not loaded when short-circuited.
The choke DR has for its object to prevent cur-rent peaks in the transistors Tl and T2 and sudden voltage transients on the line, which may occur during switching of the two transistors due to parasitic line capacitances.
Without the choke DR the line to the current source Q were consequently not interference-free, the current source Q
would in that case be connected to a not nonreactive current supply circuit.
Fig. 2 shows a second embodiment of the invention, in which the d.c. voltage converter is a push-pull switched-mode converter.
Arranged in parallel with the poles of the direct current source Q is~a series arrangement formed by a choke DR and the collector-emitter path of a transistor T2, whose emitter is'connected to the emitters of two further tran-sistors Tl and T3. The collectors of the two transistors Tl and T3 are interconnected via the primary winding of the transformer U, whose cen,tre tap is connected to the collec-'.,~'~
` lZ~6521 PHT. 82. 319 5 tor of the transistor T2. The terminals of the secondarywinding are interconnected via two oppositely poled diodes Dl and D2. A capacitor C is arranged between the junction of the two diodes Dl and D2 and the centre tap of the secondary winding, the output A of the current supply circuit and also the input of the controller R are arranged in parallel with this capacitor. The base of the transis-tor T2 is connected to the output of the controller R. The bases of the other transistors Tl and T3 are connected to a pulse generator TG, which controls them in t}le push-pull mode with a square-wa~e Yoltage whose duty cycle is 1/2.
The frequencies of the controller R and the pulse generator TG are in synchronism... The push-pull converter is pro-vided by the transformer U, the transistors Tl and T3, the diodes Dl and D2 and the capacitor C. Its mode of opera-tion is described in the:above-mentioned periodical.
The transistor T2 i5 pulse-width controllçd by the controller R. As long.as this transistor is in the non-conductive state, the.remote-supply voltage flows from the current source Q either.via the transistor Tl or T3 in the primary circuit of the.transformer U,:as the two tran-sistors Tl and T3:are controlled in the push-pull mode, so that:always one of them is conductive. The longer the transistor T2 conducts, the lower is the voltage at input E
of the current supply circuit:and consequently the load of the current source~
.~ '` r~
Claims (7)
1. A current supply circuit comprising a non-controlled switched-mode converter (G1, G2) as a d.c. volt-age converter, comprising a transformer (U) and also at least a controllable switch (T1, T3) and a controller (R) for pulse-width control, characterized in that the input (E) of the d.c. voltage converter is connected to a direct current source (Q), that a further controllable switch (T2), which is pulsed-width controlled by the controller (R) is arranged in parallel with the input (E) of the d.c.
voltage converter, and that the controllable switches (T1, T2, T3): are controlled such that they are never simul-taneously conductive.
voltage converter, and that the controllable switches (T1, T2, T3): are controlled such that they are never simul-taneously conductive.
2. A current supply circuit as claimed in Claim 1, characterized in that the d.c. voltage converter is a single-ended switched-mode converter (G1).
3. A current supply circuit as claimed in Claim 2, characterized in that the controllable switch (T1) of the single-ended switched-mode converter (G1) is controlled in the push-pull mode compared with the further controllable switch (T2).
4. A current supply circuit as claimed in Claim 1, characterized in that the d.c. voltage converter is a push-pull switched-mode converter (G2).
5. A current supply circuit as claimed in Claim 4, characterized in that the controllable switches (T1, T3) of the push-pull switched-mode converter (G2). are con-trolled by a pulse-generator (TG) in the push-pull mode relative to each other and with the same frequency as the further controllable switch (T2) .
6. A current supply circuit as claimed in Claim 1, characterized in that a choke (DR) is provided in the input circuit of the d.c. voltage converter in series with the direct current source (Q).
7. A current supply circuit as claimed in Claim 1, 2 or 3, characterized in that the controllable switches (T1, T2, T3) are transistors.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEP3221404.9 | 1982-06-05 | ||
| DE19823221404 DE3221404A1 (en) | 1982-06-05 | 1982-06-05 | POWER SUPPLY CIRCUIT |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1206521A true CA1206521A (en) | 1986-06-24 |
Family
ID=6165507
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000429483A Expired CA1206521A (en) | 1982-06-05 | 1983-06-02 | Current supply circuit |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP0099596B1 (en) |
| JP (1) | JPS58218871A (en) |
| CA (1) | CA1206521A (en) |
| DE (2) | DE3221404A1 (en) |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4595873A (en) * | 1984-07-13 | 1986-06-17 | Siemens Aktiengesellschaft | Circuit arrangement for feeding electrical users with a DC voltage |
| US4620271A (en) * | 1984-07-13 | 1986-10-28 | Siemens Aktiengesellschaft | Circuit arrangement for feeding electrical users via a switch controller |
| US4626766A (en) * | 1984-07-13 | 1986-12-02 | Siemens Aktiengesellschaft | Circuit arrangement for feeding electrical users |
| DE3427520A1 (en) * | 1984-07-26 | 1986-02-06 | Thyssen Industrie Ag, 4300 Essen | Circuit arrangement for supplying a two-pole network load |
| JPH0744827B2 (en) * | 1986-11-06 | 1995-05-15 | 株式会社東芝 | Power supply |
| US4924369A (en) * | 1988-01-26 | 1990-05-08 | Siemens Aktiengesellschaft | Regulated blocking converter wherein switch conduction time increases with higher output voltages |
| ATE112113T1 (en) * | 1990-03-09 | 1994-10-15 | Siemens Nixdorf Inf Syst | INPUT CURRENT PREVENTING SWITCHING POWER SUPPLY WITH SINUSICAL CURRENT CONSUMPTION. |
| ATE138512T1 (en) * | 1993-02-26 | 1996-06-15 | Siemens Nixdorf Inf Syst | CIRCUIT ARRANGEMENT FOR CONTROLLING THE SWITCHING ELEMENTS OF A UP-DOWN VOLTAGE CONVERTER |
| DE19531758A1 (en) * | 1995-03-22 | 1996-10-02 | Siemens Ag Albis | Sinusoidal AC=DC voltage converter with primary-switched transformers |
| WO1998040961A2 (en) * | 1997-03-12 | 1998-09-17 | Koninklijke Philips Electronics N.V. | A convertor, a power supply, and a battery charger |
| US6124778A (en) * | 1997-10-14 | 2000-09-26 | Sun Microsystems, Inc. | Magnetic component assembly |
| JP6507602B2 (en) * | 2014-12-03 | 2019-05-08 | 株式会社リコー | Power supply |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DD99705A1 (en) * | 1972-11-20 | 1973-08-20 | ||
| US4124884A (en) * | 1977-03-07 | 1978-11-07 | Bell Telephone Laboratories, Incorporated | DC to DC converter with regulated input impedance |
-
1982
- 1982-06-05 DE DE19823221404 patent/DE3221404A1/en not_active Withdrawn
-
1983
- 1983-06-02 CA CA000429483A patent/CA1206521A/en not_active Expired
- 1983-06-03 DE DE8383200810T patent/DE3366032D1/en not_active Expired
- 1983-06-03 JP JP58098111A patent/JPS58218871A/en active Pending
- 1983-06-03 EP EP83200810A patent/EP0099596B1/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS58218871A (en) | 1983-12-20 |
| DE3221404A1 (en) | 1983-12-08 |
| EP0099596B1 (en) | 1986-09-10 |
| EP0099596A1 (en) | 1984-02-01 |
| DE3366032D1 (en) | 1986-10-16 |
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