CN2119718U - Current-and voltage-limiting electricity saver - Google Patents
Current-and voltage-limiting electricity saver Download PDFInfo
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- CN2119718U CN2119718U CN 91231146 CN91231146U CN2119718U CN 2119718 U CN2119718 U CN 2119718U CN 91231146 CN91231146 CN 91231146 CN 91231146 U CN91231146 U CN 91231146U CN 2119718 U CN2119718 U CN 2119718U
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Abstract
The utility model relates to a current-and voltage-limiting power-saving device, which is a power-saving device for limiting a load power and a voltage lower than rated values. A bidirectional thyristor and a current transformer are respectively connected in series inside a phase wire connected with single-phase loads or three-phase loads. Both ends of the bidirectional thyristor are connected with a voltage-sensitive resistor in series, resistor capacitor units connected in series, and the flip-flop circuit of resistance-capacity phase shift. A voltage-sensitive resistor, a control transformer, and the resistor capacitor unit are connected in parallel between phase lines and the zero line on an input side. A feedback transformer and the resistor capacitor unit connected in parallel between the phase wires and the zero lines on an output side. When the load current and the voltage exceed the rated value, the bidirectional thyristor automatically reduces the angle of flow for limiting the current and the voltage and making a lighting lamp and an electrical device save electricity and prolong the service life.
Description
The utility model has single-phase, and the branch of three-phase is the power-saving life-prolonging device that a kind of restriction load (illuminating lamp or electric equipment) electric current, voltage all are no more than its rated value.
The utility model is improved by " electrotechnics " magazine the 9th phase of nineteen ninety 38-40 page or leaf " the pressure limiting economize on electricity of illuminating lamp " civilian disclosed circuit, known illuminating lamp pressure limiting electricity-saving circuit has adopted the unidirectional thyristor of two reverse parallel connections as the pressure limiting element, the stream link of not limiting, with adopting the bidirectional thyristor ratio, price height not only, and increase its volume and weight, and can not current limliting economize on electricity, the unidirectional brilliant pipe of two reverse parallel connections is burnt because of the serious flow short-circuit of crossing.
The purpose of this utility model is that a kind of electric current, voltage of the restriction load (illuminating lamp or electric equipment) of bidirectional thyristor summation current transformer of adopting of design all is no more than its rated value, thereby makes the device of load power-saving life-prolonging.
Technical solution of the present utility model is: piezo-resistance (YM in parallel between the input side phase line (single-phase or three-phase) of this current limiting pressure-limiting electricity-saving appliance and zero line
1) and the series connection Resistor-Capacitor Unit (R
1And C
1), suppressing various overvoltage from mains side, Resistor-Capacitor Unit (R4 and the C of series connection in parallel between its outlet side phase line (single-phase or three-phase) and zero line
4), to suppress and to absorb the overvoltage of outlet side.
Bidirectional thyristor (SJG) end in parallel piezo-resistance (YM
2) and the series connection Resistor-Capacitor Unit (R
2And C
2), avoid superpotential harm with protection bidirectional thyristor (SJG).Control transformer (B also in parallel between electricity-saving appliance input side (side of joining power) phase line (single-phase or three-phase) and zero line
1) primary winding, the two ends of its pair winding are connected single-phase rectification bridge (ZL
2) C point and d point, and feedback transformer (B
2) primary winding be connected in parallel between electricity-saving appliance outlet side phase line (single tooth or three-phase) and the zero line, its pair winding two ends are connected in single-phase rectification bridge (ZL
3) e point and f point.In the phase line (single-phase or three-phase) at load (Z) place, respectively go here and there the primary winding and a bidirectional thyristor (SJG) of a current transformer of duty (LH), and current transformer (LH) is positioned at the input side phase line, its pair winding and a shunt resistance (R
5) be attempted by single-phase rectification bridge (ZL after the parallel connection
4) i point and j point.The control board (G) of one end of two voltage stabilizing didoes of bidirectional trigger diode (SCF) or differential concatenation and bidirectional thyristor (STG) links, the other end and single-phase rectification bridge (ZL
1) n point and electric capacity (C
3) an end link.Electric capacity (C
3) the other end and T
1The point link, the collector electrode of transistor (BG), emitter respectively with single-phase rectification bridge (ZL
1) Q point, P point link.Forward two groups of diode (D of series connection in parallel between the emitter of transistor (BG) and the base stage
5-6And D
7-8), play the amplitude limit effect, these two groups of diode (D
5-6And D
7-8) be the reversed polarity parallel connection.Single-phase rectification bridge (ZL
1) by four diode (D
1-4) constitute utmost point pipe (D
1) and diode (D
3) negative electrode all be connected on the Q point, its anode is connected on m point, n point, diode (D respectively
2) and diode (D
4) anode all be associated in the P point, its negative electrode is connected on M point and n point respectively.
Single-phase rectification bridge (ZL
4) by four diode (D
17-20) constitute diode (D
17) and diode (D
19) negative electrode all be connected in the l point, its anode is connected on i point and j point, diode (D respectively
18) and diode (D
20) anode all be connected in the K point, its negative electrode is connected on i point and j point respectively.K point and electric capacity (C
6) negative pole and potentiometer (DW
3) an end link potentiometer (DW
3) the other end and electric capacity (C
6) anodal same single-phase rectifier (ZL
4) the l point link potentiometer (DW
3) lever arm and voltage stabilizing didoe (WY
2) anode link voltage stabilizing didoe (WY
2) negative electrode and temperature compensated diode (D
21) negative electrode link temperature compensated diode (D
21) anode and current-limiting resistance (R
3) an end link current-limiting resistance (R
3) the base stage of the other end (1 ') and transistor (BG) link.
Single-phase rectification bridge (ZL
3) by four diode (D
13-16) constitute diode (D
13) and diode (D
15) negative electrode all be connected in the g point, its anode is connected on e point and f point, diode (D respectively
14) and diode (D
16) anode all be connected in the h point, its negative electrode is connected on e point and f point respectively.Single-phase rectification bridge (ZL
3) g point and electric capacity (C
5) positive pole and potentiometer (DW
2) an end be connected the same electric capacity (C of its h point
5) negative pole and potentiometer (DW
2) the other end be connected, same single-phase rectification bridge (ZL
2) the h point be connected.Potentiometer (DW
2) lever arm and the emitter of transistor (BG) link.
Single-phase rectification bridge (ZL
2) by four diode (D
9-12) constitute diode (D
9) and diode (D
11) negative electrode all be connected in a point, its anode is connected on C point and d point, diode (D respectively
10) and diode (D
12) anode all be connected on the b point, its negative electrode is connected on c point and d point respectively.
Single-phase rectification bridge (ZL
2) a point and electric capacity (C
0) positive pole and voltage regulation resistance (R
W) an end link b point and capacitor (C
0) negative pole, voltage stabilizing didoe (WY
1) anode, and idiostatic device (DW
1) the other end link potentiometer (DW
1) the same current-limiting resistance (R of lever arm
6) series connection back links with the base stage of transistor (BG).
Control transformer (B
1) be changed to 220 volts/30 volts, secondary voltage is 30 volts, this voltage is through rectifier bridge (ZL
2) after the rectification, by electric capacity (C
0) filtering, resistance (R
W) step-down, voltage stabilizing didoe (WY
1) voltage stabilizing, through potentiometer (DW
1) output " given voltage " u
9(8-10 volt).
Feedback transformer (B
2), no-load voltage ratio is 220 volts/12 volts, and secondary voltage is 12 volts, and this voltage is through rectifier bridge (ZL
3) rectification, electric capacity (C
5) after the filtering by potentiometer (DW
2) output feedback voltage uf(8-10 volt).Feedback voltage U
fWith given voltage U
9After series connection is comprehensive, form the control voltage U
k, S is between the base stage and emitter of transistor (BG), as shown in Figure 2.
Diode D
1-4And transistor (BG) constitutes an electronic potentiometer, and with electric capacity (C
3) form circuits for triggering, its synchronizing voltage is taken from the two ends of bidirectional thyristor (SJG).After the electricity-saving appliance energized, electric capacity (C
3) when both end voltage was charged to the forward and reverse breakover voltage that is equal to or greater than bidirectional trigger diode (SCF), bidirectional trigger diode (SCF) moment conducting produced hard pulse, triggers bidirectional thyristor (SJG), makes it instantaneous conducting.
When supply voltage just in time is 220 volts, transistor (BG) saturation conduction, the full conducting of bidirectional thyristor (SJG), output voltage is 220 volts.
When supply voltage is higher than 220 volts, feedback voltage (U
f) increase, make control voltage (U
k) descend, cause transistor (BG) to be in magnifying state, electric capacity (C
3) charging interval just correspondingly be extended, the output trigger impulse is moved constantly, make bidirectional thyristor (SJG) reduce the angle of flow, 220 volts voltages of pressure limiting output are realized its pressure limiting economize on electricity (power consumption of load and voltage square be directly proportional).
When supply voltage was equal to or less than 220 volts, then bidirectional thyristor (SJG) did not play pressure limiting effect, yet not redeeming.
The load current that flows through in the phase line at electricity-saving appliance place is 0.5 amp-150 ampere-hours, and the secondary winding of current transformer (LH) just induces the alternating voltage of 10-19 volt, by single-phase rectification bridge (ZL
4) rectification, electric capacity (C
6) after the filtering, through voltage-stabiliser tube (WY
2) and diode (D
21) and resistance (R
3), from its Current Negative Three-Point Capacitance voltage of l point and l ' some output (U '
f), adjust voltage device (DW
3), can change its Current Negative Three-Point Capacitance voltage (U '
f) size.
When load current during less than rated value, Current Negative Three-Point Capacitance voltage (U '
f) less than voltage-stabiliser tube (WY
2) reverse breakdown voltage, so voltage-stabiliser tube (WY
2) not conducting, this moment, the current cut-off negative feedback was inoperative.When load current during greater than rated value, Current Negative Three-Point Capacitance voltage (U '
f) greater than voltage-stabiliser tube (WY
2) reverse breakdown voltage, make voltage-stabiliser tube (WY
2) the reverse breakdown conducting, and act directly on and constitute parallel-current between the emitter of transistor (BG) and the base stage by negative feedback, with control voltage (U
k) in parallel comprehensive after, remove to control the angle of flow of bidirectional thyristor (SJG), make its corresponding reducing, thereby limit load over-current (overcurrent that short circuit or overload cause) effectively, avoid load overheated (caloric value of load and electric current square be directly proportional), prolong load (electrical appliance or the equipment) life-span, current limliting economize on electricity (power consumption of load and electric current square be directly proportional).
The utility model is compared with the circuit that " electrotechnics " the 9th phase nineteen ninety " the pressure limiting economize on electricity of an illuminating lamp " literary composition is introduced, and compares with " the electric world " the 12nd phase in 1989 the 16th page " simple and easy voltage limiter ", has following advantage and good effect:
(1) electric current, the voltage that can limit load effectively is no more than its rated value, thereby avoid because of overcurrent-overvoltage (when center line disconnects, the phase voltage of load is elevated to 3 times, be enough to burn power consumption equipment) dielectric strength that causes descends, power consumption increases and disadvantage such as electric component punch through damage, receive make that load is lengthened the life, the effect of consumption reduction, economize on electricity and safe operation.When overcurrent or overvoltage 10%, economize on electricity 21%, and also overcurrent-overvoltage is serious more, and it is many more to economize on electricity.
(2) adopt bidirectional thyristor as the pressure limiting element, volume is little, in light weight, has realized that oncontacting reveals, and circuits for triggering are simple and reliable and be easy to automatic control.
(3) the adjustment precision of current limiting pressure-limiting is higher.
Below in conjunction with accompanying drawing and example the utility model is further specified.
Fig. 1 is a functional-block diagram of the present utility model, among Fig. 1, and 1, over-pressure safety device; 2, given signal link; 3, current transformer, 4, electric current carries only negative feedback links, 5, overvoltage protection; 6, current limiting pressure-limiting element; 7, trigger, 8, composite control signal, 9, the Voltage Feedback link; 10, over-pressure safety device, 11, use electric loading.
Fig. 2 is a three-phase current limiting pressure-limiting electricity-saving appliance A circuitry phase winding diagram, among the figure, and U
9Be given voltage, U
fBe feedback voltage, U
kBe control voltage, DK is the single-throw disconnecting link, A, O are the electricity-saving appliance input terminal, import 220 volts of-260 volts of alternating voltages, A ', O ' are the electricity-saving appliance lead-out terminal, export 220 volts of alternating voltages, bidirectional thyristor (SJG) left side is an input side, and the right side is an outlet side, AA ' is a phase line, and OO ' is a zero line.
Fig. 3 is a three-phase current limiting pressure-limiting electricity-saving appliance block diagram.Among Fig. 3, the single-phase current limiting pressure-limiting electricity-saving appliance (DJ) of connecting respectively in the phase line of A, B, C three-phase.
Fig. 4 is feedback transformer core dimensions figure, among Fig. 4.A is 10 millimeters, and c is 8 millimeters, and b is 20 millimeters, and L is 36 millimeters, and h is 25 millimeters, and H is 35 millimeters, and core section amasss S
cBe 1.78(centimetre)
2
Fig. 5 is the current transformer core dimensional drawing.Among Fig. 5, a is 10 millimeters, and b is 20 millimeters, and c is 12.5 millimeters, and h is 32 millimeters, and H is 52 millimeters, and L is 32.5 millimeters, and core section amasss S
cBe 1.78(centimetre)
2
In the embodiment shown in Figure 2, disconnecting link (DK) is connected on electricity-saving appliance input side A, D terminal, afterwards, with piezo-resistance (YM
1) parallel connection.Cloudy (the YM of pressure-sensitive electricity
1) select the MY31-470/1 type for use, its terminates on the phase line, and the other end is connected on the zero line.Electric capacity (C
1) back and being connected between the phase line and zero line of electricity-saving appliance input side of connecting with resistance (R1), choose R
1Be 20 Europe/0.25 watt resistance, C
1Be 0.5 microfarad/500 volt ac capacitors.
Control transformer (B
1) the primary winding two ends be connected in parallel between electricity-saving appliance input side phase line and the zero line, its pair winding two terminates at single-phase rectification bridge (ZL
2) C point and d point.
The primary winding of the mutual device of electric current (LH) directly is connected in the input side phase line (AA '), its pair winding two ends and shunt resistance (R
5) be connected on single-phase rectification bridge (ZL after the parallel connection
4) i point and j point.Select R for use
5Be 10 Europe/10 watt resistance.
Two-way brilliant lock (SJG) is connected in the phase line (AA '), its first electrode (T
1) link the second electrode (T with the lead-out terminal (A ') of phase line (AA ')
2) link with an end of the primary winding of current transformer (LH), bidirectional thyristor (SJG) is answered the size of apparent load rated current, select the element of/600 volts of 10-200 peaces for use, for example working as the load rating electric current is 150 peaces, just can select/600 volts of type bidirectional thyristors of KS-200 peace for use.Piezo-resistance (the YM in parallel at bidirectional thyristor (SJG) two ends
2) and the capacitance-resistance (R that connecting
2And c
2) element.Piezo-resistance (YM
2) select MY for use
31-300/1 type, resistance (R
2) select for use the golden film of 20 Europe/0.5 watt or carbon resistance film all can, electric capacity (C
2) select the paper of the 0.5 microfarad/500 volt convoluted capacitor that is situated between for use.
One end of bidirectional trigger diode (SCF) and electric capacity (C
3) an end be connected in single-phase rectification bridge (ZL jointly
2) the n point, the control utmost point (G) of the same respectively bidirectional thyristor of their other end (SJG) and the first electrode (T
1) link.Bidirectional trigger diode (SCF) is selected 2CTS for use
2Type.Electric capacity (C
3) select the paper of the 0.5 microfarad/500 volt convoluted ac capacitor that is situated between for use.
Single-phase rectification bridge (ZL
1) by four diode (D
1-4) constitute diode (D
1) and diode (D
3) negative electrode all be connected on the Q point, its anode is connected on m point and n point respectively; Diode (D
2) and diode (D
4) anode all be connected on the P point, its negative electrode is connected on m point and n point respectively.The emitter and collector of transistor (BG) is connected in P point and Q point respectively.Diode (D
1-4) select 2CP26 type silicon diode (300 milliamperes/600 volts) for use.
Select for use transistor (BG) to be silicon triode 3DD2530 type (/ 600 volts of 1 peaces).
Feedback transformer (B in parallel between the phase line (AA ') of the outlet side of this electricity-saving appliance and zero line (OO ')
2) primary winding and the capacitance-resistance (R that connecting
4And C
4) element.Select resistance (R
4) be the carbon resistance film of 20 Europe/1 watt, select electric capacity (C
4) be the AC capacitor of 2 microfarads/400 volt.Feedback transformer (B
2) the two ends and the single-phase rectification bridge (ZL that pay winding
3) l point and f point link the same filter capacitor (C of g point
5) positive pole and potentiometer (BW
2) an end link the same filter capacitor (C of h point
5) negative pole and potentiometer (DW
2) the other end and rectifier bridge (ZL
2) the b point link.Potentiometer (DW
2) the emitter of movable knee-joint transistor (BG).
Two groups of diode (D of reverse parallel connection between the base stage of transistor (BG) and emitter
5-6With
7-8), every group of diode all is made up of two diodes, and sequentially is together in series.
Select diode (D for use
5-8) be ZCP26 type (300 milliamperes/600 volts), select potentiometer (DW for use
2) be 2 kilo-ohms/1 watt, select filter capacitor (C
5) be the electrolytic capacitor of 100 microfarads/50 volt, resistance (R
W) select 4.7 kilo-ohms/2 watts carbon resistance film for use.Voltage stabilizing didoe (WY
1) select 2CW for use
4Type (U
W=10-12 volt, I
W=5-20 milliampere).Potentiometer (DW
1) select 2 kilo-ohms/1 watt for use.
Single-phase rectification bridge (ZL
4) l point and filter capacitor (C
6) positive pole and potentiometer (DW
3) an end be linked together, be linked together, and K point and filter capacitor (C with the emitter (P point) of transistor (BG)
6) negative pole and potentiometer (DW
3) other end links potentiometer (DW
3) lever arm and voltage stabilizing didoe (WY
2) negative electrode link voltage stabilizing didoe (WY
2) negative electrode and diode (D
21) negative electrode link diode (D
21) anode and resistance (R
3) an end link.Resistance (R
3) the base stage of the other end (l ') and transistor (BG) link.
Filter capacitor (C
6) select the electrolytic capacitor of 100 microfarads/50 volt for use.Select potentiometer (DW
3) specification be 2 kilo-ohms/1 watt.Select voltage-stabiliser tube (WY
2) be ZCW21 type (U
W=3-4.5 volt, I
W=30-220 milliampere).Select diode (D for use
21) be ZCP21 type (300 milliamperes/100 volts).Select resistance (R for use
3) be the wire resistor of 51 Europe/5 watt.
Control transformer (B
1) no-load voltage ratio be 220 volts/30 volts, elementary winding is with enamelled wire coiling 3480 circles of 0.1 mm dia.Control transformer (B
1) the model of iron core elect as: XED10 * 20 * 25, its size is as shown in Figure 4.Secondary winding 530 circles, 0.16 millimeter of enamelled wire diameter.
Feedback transformer (B
2) the iron core model be XED10 * 20 * 25, its size is as shown in Figure 4.This transformer (B
2) no-load voltage ratio be 220 volts/12 volts, elementary winding is 3480 circles, secondary winding is 212 circles, primary and secondary winding enamelled wire diameter is 0.1 millimeter.
The iron core model of current transformer (LH) is: XCB10 * 20 * 32, its size as shown in Figure 5, a is 10 millimeters, b is 20 millimeters, h is 32 millimeters, H is 52 millimeters, C is 12.5 millimeters, L is 32.5 millimeters, its iron core column sectional area S
C=1.78(centimetre)
2
The elementary winding of this current transformer (LH) is taken as 1 circle, and its lead is selected 2 millimeters * 30 millimeters * 150 millimeters copper coin for use, and secondary winding is selected 0.55 millimeter enamelled wire coiling 255 circle for use.
Claims (4)
1, a kind ofly is used to limit the electric current of illuminating lamp and electric equipment, the battery saving arrangement that voltage is no more than its rated value, piezo-resistance (YN in parallel between its input side phase line (single-phase or three-phase) and the zero line
1) and the series connection Resistor-Capacitor Unit (R
1And C
1), the Resistor-Capacitor Unit (R that connects in parallel between its outlet side phase line (single-phase or three-phase) and the zero line
4And C
4), piezo-resistance (YN in bidirectional thyristor (SJG) two ends parallel connection
2) and the series connection Resistor-Capacitor Unit (R
2, C
2), it is characterized in that:
Control transformer primary winding and input side phase line and zero line are in parallel, the two ends of its pair winding and single-phase rectification bridge (ZL
2) the C point be connected with the d point, and the primary winding of feedback transformer and electricity-saving appliance outlet side phase line and zero line are in parallel, its pair winding two ends are connected in single-phase rectification bridge (ZL
3) e point and f point, and the primary winding and a bidirectional thyristor (SJG) of the current transformer (LH) of in the single-phase or triple line at load (Z) place, respectively connecting, and current transformer (LH) is positioned at input hand hay cutter phase line, bidirectional thyristor (SJG) between the input side and outlet side of place phase line, its first electrode and T
1Point links second electrode and T
2Point links, and its current transformer is paid winding and a shunt resistance (R
5) be attempted by single-phase rectification bridge (ZL after the parallel connection
4) i point and j point, the control utmost point (G) of an end of two voltage stabilizing didoes of diac (SCF) or differential concatenation and bidirectional thyristor (SJG) links, its other end and single-phase rectification bridge (ZL
1) the n point and trigger electric capacity (C
3) an end link, trigger electric capacity (C
3) the other end and T
1The point link, the collector electrode of transistor (BG), emitter respectively with single-phase rectification bridge (ZL
1) Q point, P point be connected forward two groups of diode (D of series connection in parallel between the emitter of transistor (BG) and the base stage
5-6And D
7-8), these two groups of diode (D
5-6And D
7-8) be the reversed polarity parallel connection, single-phase rectification bridge (ZL
1) by four diode (D
1-4) constitute diode (D
1) and diode (D
3) negative electrode all be associated in the D point, its anode is connected on a point and n point, diode (D respectively
2) and diode (D
4) anode all be connected in the P point, its negative electrode is connected on n point and n point respectively.
2, electricity-saving appliance according to claim 1 is characterized in that: single-phase rectification bridge (ZL
4) by four diode (D
17-20) constitute diode (D
17) diode (D
19) negative electrode all be connected in the l point, its anode is connected on i point and j point, diode (D respectively
18) and diode (D
20) anode all be connected in the K point, its negative electrode is connected on i point and j point respectively, the K point also with electrochemical capacitor (C
6) negative pole and potentiometer (DW
3) an end link l point and electrolytic capacitor (C
6) positive pole and potentiometer (DW
3) the other end link, link potentiometer (DW with the emitter of transistor (BG)
3) lever arm and voltage stabilizing didoe (WY
2) anode link voltage stabilizing didoe (WY
3) cathode and temperature compensated diode (D
21) negative electrode link temperature compensated diode (D
21) anode and current-limiting resistance (R
3) an end link current-limiting resistance (R
3) the other end and the base stage of transistor (BG) link.
3, electricity-saving appliance according to claim 1 is characterized in that: single-phase rectification bridge (ZL
3) by four diode (D
13-16) constitute diode (D
13) and diode (D
15) negative electrode all be connected in the g point, its anode is connected on l point and f point, diode (D respectively
13) and diode (D
16) anode all is connected on the h point, its negative electrode is connected on t point and f point respectively, the g point also with electric capacity (C
5) anodal and potentiometer (DW
2) an end link, the h point also with electric capacity (C
5) negative pole and potentiometer (DW
2) other end links, same single-phase rectification bridge (ZL
2) the b point link potentiometer (DW
2) lever arm and transistor (BG) emitter link.
4, electricity-saving appliance according to claim 1 is characterized in that: single-phase rectification bridge (ZL
2) by four diode (D
9-12) constitute diode (D
9) diode (D
11) negative electrode all be connected on a point, its anode is connected on c point and d point, diode (D respectively
10) diode (D
12) anode all be connected on the b point, its negative electrode is connected on c point and d point respectively, a point also with electric capacity (C
0) positive pole and an end of voltage regulation resistance (RW) link b point and electric capacity (C
0) negative pole, voltage stabilizing didoe (WY
1) anode and potentiometer (DW
1) an end link, the other end of voltage regulation resistance (RW) is connected on voltage stabilizing didoe (WY
1) negative electrode, and idiostatic device (DW
1) the other end link potentiometer (DW
1) lever arm serial connection current-limiting resistance (R
6) back links with the base stage of transistor (BG).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91231146 CN2119718U (en) | 1991-12-17 | 1991-12-17 | Current-and voltage-limiting electricity saver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91231146 CN2119718U (en) | 1991-12-17 | 1991-12-17 | Current-and voltage-limiting electricity saver |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2119718U true CN2119718U (en) | 1992-10-21 |
Family
ID=4936391
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 91231146 Granted CN2119718U (en) | 1991-12-17 | 1991-12-17 | Current-and voltage-limiting electricity saver |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2119718U (en) |
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| CN114365367A (en) * | 2019-09-11 | 2022-04-15 | 3M创新有限公司 | Transformer and apparatus configured to provide a current limited power supply and a galvanic barrier |
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1991
- 1991-12-17 CN CN 91231146 patent/CN2119718U/en active Granted
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100431234C (en) * | 2003-01-21 | 2008-11-05 | 罗姆股份有限公司 | Electronic apparatus |
| CN100428602C (en) * | 2005-04-26 | 2008-10-22 | 新巨企业股份有限公司 | Control circuit of electric power supplier with fixed current limiting mode |
| CN100386640C (en) * | 2006-03-17 | 2008-05-07 | 中国电力科学研究院 | Flexible balancing temperature-raising experimental device of crystal brake valve |
| WO2012041147A1 (en) * | 2010-09-28 | 2012-04-05 | Zhang Bin | Voltage conversion device |
| CN104659899A (en) * | 2014-12-29 | 2015-05-27 | 西安华为技术有限公司 | Method, device and system for flow equalization |
| CN104659899B (en) * | 2014-12-29 | 2018-08-21 | 西安华为技术有限公司 | A kind of current equalizing method, apparatus and system |
| CN114365367A (en) * | 2019-09-11 | 2022-04-15 | 3M创新有限公司 | Transformer and apparatus configured to provide a current limited power supply and a galvanic barrier |
| CN111614274A (en) * | 2020-04-24 | 2020-09-01 | 中国南方电网有限责任公司超高压输电公司广州局 | Converter valve voltage-sharing electrode power supply device for scaling test |
| CN113692073A (en) * | 2021-09-16 | 2021-11-23 | 湖南红太阳光电科技有限公司 | Transformerless electric heating control circuit, control method and tube furnace |
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