CN1925302A - Control device for geometric proportion driven power supplying apparatus - Google Patents
Control device for geometric proportion driven power supplying apparatus Download PDFInfo
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- CN1925302A CN1925302A CN 200510098512 CN200510098512A CN1925302A CN 1925302 A CN1925302 A CN 1925302A CN 200510098512 CN200510098512 CN 200510098512 CN 200510098512 A CN200510098512 A CN 200510098512A CN 1925302 A CN1925302 A CN 1925302A
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Abstract
This invention relates to control device about one equal drive power supplier, which comprises one feedback control circuit to supply power and flexible input end is used to set flexible start time of power supplier with first and second output ends are used to output first and second signals to couple power supplier one first switch and second switch to control power supplier output with one protection unit composed of voltage input end, current detection end and power detection end and signal detection end.
Description
Technical field
The present invention relates to a kind of control device of power supply unit, particularly relate to a kind of control device of device for geometric proportion driven power supplying.
Background technology
The advantage of geometric proportion driven power supplying circuit is the efficient height, and especially when driving a bipolar transistor, its control device does not need to produce very big base current and drives this bipolar transistor.But this control device only need produce the just power supply output of the high watt of drive controlling of little control signal.
Fig. 1 is the circuit of a device for geometric proportion driven power supplying.The one first output signal S that produced of control device (not shown) wherein
1With one second output signal S
2, be to be used for controlling and driving transistor 51 and 61 respectively.This driving transistors 51 and 61 is connected to a driving transformer 20, and then the switching of power controlling transistor 50 and 60. Power transistor 50,60 and capacitor 40,45 are construed as a half-bridge bogie structure circuit, are used to switch a transformer 10.This transformer 10 has possessed many groups secondary winding (winding N for example
S1, N
S1', N
S2, and N
S2'), produce many group voltages (voltage E for example respectively via the rectifying and wave-filtering of rectifier (for example diode 71～74), inductance (for example inductance 91,95) and capacitor (for example electric capacity 81,83)
1With E
2).And voltage E
1With E
2Can be again produce more groups of output voltages (output voltage V for example with the filtering of capacitor (for example electric capacity 82,84,85) via a plurality of impedors (for example impedance 92,93,96)
1, V
2A, V
2B).Impedor 92,93,96 wherein can be inductance or resistance.And this voltage E
1More can produce another output voltage V by a voltage regulator 100
3In addition, the inferior utmost point winding N of transformer 10
S1With N
S1' reach the bleeder circuit of being formed by resistance 98,99 and be connected to a signal detection end UVAC via rectifier 73,74, be used to detect the voltage of signals position standard of transformer 10.
This driving transformer 20 shown in Figure 1 has comprised recommends winding N
D1With N
D2, base stage winding N
B1With N
B2, and electric current winding N
1Wherein recommend winding N
D1With N
D2Centre tap be coupled to a power supply V through a diode 31 and a resistance 34
CCThis centre tap is coupled to a power detecting end OPP through a diode 32, a capacitor 33 and resistance 35,36 again, is used to detect the power output of this device for geometric proportion driven power supplying.In addition, recommend winding N
D1With N
D2Two ends be connected to driving transistors 51 and 61 respectively.And driving transistors 51 and 61 have respectively a backward diode 52 with 62 with in parallel.The base stage winding N of this driving transformer 20
B1With N
B2Pass through impedance circuit 55 and 65 and driving power transistor 50 and 60 respectively.This electric current winding N
IThen connect, be used to respond to the electric current of this transformer 10 with this half-bridge driven framework circuit.
Fig. 2 A～Fig. 2 F illustrates the work schedule and the state of this device for geometric proportion driven power supplying respectively.Shown in Fig. 2 A, when by this first output signal S
1This transistor 51 of conducting (turn on) and by this second output signal S
2When (turn off) this transistor 61, a little electric current will flow through resistance 34, diode 31, recommend winding N
D1And driving transistors 51.And then, recommend winding N
D1To make base stage winding N
B1Respond to an electromotive force, this electromotive force also passes through impedance circuit 55 promotion power transistors 50.
In case power transistor 50 conductings, shown in Fig. 2 B, an electric current I
PWill be by capacitor 40 flow through power transistor 50, electric current winding N
I, transformer 10 and flow back to capacitor 40.At this moment, electric current winding N
IWill because of self-excitation positive feedback effect at base stage winding N
B1Generation is also amplified first-class proportional current I
B1,
I
B1＝I
P×(T
N1/T
NB1)--------------------- (1)
T wherein
N1With T
NB1Be respectively electric current winding N
1With base stage winding N
B1Winding turns.
By shown in the formula (1) as can be known, the electric current winding N that the base current of power transistor 50 and the ratio of collected current can be by driving transformers 20
IWith base stage winding N
B1Winding ratio decide.Work as electric current I
B1When promoting the base stage of power transistor 50 by impedance circuit 55, a voltage V
BTo be based upon base stage winding N
B1On,
V
B＝I
B1×Z
55----------------------------- (2)
Z wherein
55It is the equiva lent impedance of impedance circuit 55.
This voltage V
BMore winding N will recommended
D1Respond to a voltage V
D,
V
D＝(T
ND1/T
NB1)×V
B-------------------- (3)
T wherein
ND1Be to recommend winding N
D1Winding turns.
By formula (1), (2), formula (3) as can be known
V
D＝(T
ND1/T
NB1)×(T
N1/T
NB1)×Z
55×I
P--- (4)
Therefore, by formula (3) voltage V as can be known
DElectric current I with transformer 10
PProportional variation.And voltage V
DBe coupled to power detecting end OPP through diode 32, capacitor 33 and resistance 35,36, be used to detect the power output of power supply unit.
Please refer to shown in Fig. 2 C, when opening the first output signal S
1Driving transistors 51 is also opened the second output signal S
2During driving transistors 61, winding N will recommended
D1With N
D2Two ends form Low ESR, and make it as short circuit.Because recommend winding N
D1With N
D2Just as short circuit, and make energy can't be delivered to base stage winding N
B1With N
B2At this moment, base stage winding N
B1With N
B2Also respond to into low impedance state.Therefore, power transistor 50 and 60 have been closed.
See also shown in Fig. 2 D～Fig. 2 F, the action of another phase place of device for geometric proportion driven power supplying is described respectively, its work schedule is similar to Fig. 2 A～Fig. 2 C to state, so repeat no more.
Learn that by above-mentioned device for geometric proportion driven power supplying is to utilize the self-excitation positive feedback of driving transformer 20 to finish, and closes power transistor 50 and 60 by short circuit driving transformer 20 driving power transistor 50 and at 60 o'clock.Its electric current I
PMessage also be rectifying and wave-filtering through diode 32 and capacitor 33, become a direct current signal and just deliver to power detecting end OPP.Therefore, can't accomplish the control protection of each phase place (cycle-by-cycle).When the output of this device for geometric proportion driven power supplying is short-circuited, because of the self-excitation positive feedback effect of driving transformer 20, will produce a great electric current output, and the system of burning this device for geometric proportion driven power supplying and being supplied.And the maximum current limit of each group output of this device for geometric proportion driven power supplying can be used for the system that protects power supply unit and supplied, especially protects connector and associated adapter under this.In addition, for energy-conservation, power management and the mains switch function that designs all is the essential control circuit of device for geometric proportion driven power supplying.
Summary of the invention
The objective of the invention is to; a kind of control and protective circuit of device for geometric proportion driven power supplying of complete new structure are provided; technical problem to be solved be make this high efficiency, the device for geometric proportion driven power supplying circuit has practicality cheaply, thereby be suitable for practicality more.
Another object of the present invention is to; a kind of control device of device for geometric proportion driven power supplying is provided; technical problem to be solved is to make it with high efficiency, control at low cost and the output of protecting device for geometric proportion driven power supplying; and can indicate the output situation of this power supply unit, thereby be suitable for practicality more by the power status signal.
A further object of the present invention is, a kind of control device of power supply unit is provided, and technical problem to be solved is to make it with high efficiency, control the output of power supply unit at low cost, thereby is suitable for practicality more.
An also purpose of the present invention is; a kind of control device of power supply unit is provided; technical problem to be solved is to make it with high efficiency, control at low cost and the output of protecting power supply unit; and can indicate the output situation of this power supply unit by the power status signal; thereby be suitable for practicality more, and have the value on the industry.
Based on above-mentioned and other purpose; the present invention proposes a kind of control device of device for geometric proportion driven power supplying, comprises one first back coupling input, one first amplifier out, a soft start input, frequency of oscillation setting end, at least one voltage input end, at least one current sense terminal, a power detecting end, a signal detection end, a mains switch input, a power status indication end, one first output, one second output, one first amplifier, an oscillator, a protected location and an output circuit.The output that the first back coupling input is coupled to this device for geometric proportion driven power supplying is to provide first group of back coupling control of this device for geometric proportion driven power supplying.First amplifier out provides to feedback and compensates.The soft start input is connected to a soft start capacitor device, to set the soft-start time of device for geometric proportion driven power supplying.Frequency of oscillation is set end and is connected to a resistance.Voltage input end, current sense terminal and power detecting end are coupled to device for geometric proportion driven power supplying.The signal detection end is coupled to the transformer of device for geometric proportion driven power supplying.First output output first outputs signal to first diverter switch of this device for geometric proportion driven power supplying.Second output output second outputs signal to second diverter switch of device for geometric proportion driven power supplying.Wherein, first diverter switch is connected and switches the transformer of device for geometric proportion driven power supplying with second diverter switch, and then controls the output of device for geometric proportion driven power supplying.
First input of first amplifier is connected to the first back coupling input, the soft start input is coupled in second input of first amplifier, and the output of first amplifier is coupled to first amplifier out, and wherein the soft start input provides first amplifier one reference voltage.Oscillator is connected to frequency of oscillation and sets end, sets its frequency of oscillation in order to foundation resistance.Protected location; in order to be connected to the output voltage of voltage input end with the detecting device for geometric proportion driven power supplying; be connected to the output current of current sense terminal with collocation voltage input end detecting device for geometric proportion driven power supplying; be connected to the power output of power detecting end with the detecting device for geometric proportion driven power supplying; be connected to the voltage of signals position standard of signal detection end, and be connected to the mains switch input to receive a power switch signal with the detecting transformer.Output circuit is electrically connected to first amplifier, oscillator, protected location, first output and second output; in order to produce and to provide respectively first output signal and second to output signal to first output and second output according to the output of first amplifier; determine the switching frequency of first output signal and this second output signal according to the output of oscillator, and determine to open and close device for geometric proportion driven power supplying according to the output of protected location.Wherein, this control device is more according to voltage input end, signal detection end and mains switch input, and via exporting a power status signal in this power status indication end, with the output situation of indication device for geometric proportion driven power supplying.
From another viewpoint, the present invention proposes a kind of control device of device for geometric proportion driven power supplying, comprises one first back coupling input, one first amplifier out, a soft start input, one first output, one second output, at least one voltage input end, a power detecting end, a signal detection end, a mains switch input and a power status indication end.First feedbacks first input that input is connected to first amplifier, and wherein this first feedbacks the output that input more is coupled to device for geometric proportion driven power supplying, feedbacks control so that first group of device for geometric proportion driven power supplying to be provided.First amplifier out is coupled to the output of first amplifier, compensates to provide to feedback.The soft start input is connected to the soft start capacitor device, is used to set the soft-start time of device for geometric proportion driven power supplying.The soft start input more is coupled to second input of first amplifier, to provide first amplifier one reference voltage.First output and second output are exported first output signal and second output signal respectively.First output signal and second output signal are to produce according to the output of first amplifier, and couple drive first diverter switch and second diverter switch.Wherein, first diverter switch is connected and switches the transformer of device for geometric proportion driven power supplying with second diverter switch, and then controls the output of device for geometric proportion driven power supplying.Voltage input end is connected to excess voltage protection and under-voltage protection circuit, is used to detect the output voltage of device for geometric proportion driven power supplying.The power detecting end is connected to the overpower protection circuit, is used to detect the power output of device for geometric proportion driven power supplying.The signal detection end is coupled to transformer and signal detection circuit, is used to detect the voltage of signals position standard of transformer.The mains switch input receives power switch signal and is connected to power switch circuit, is used to open and close device for geometric proportion driven power supplying.The power status indication end produces the power status signal according to the output of voltage protection circuit, the output and the power switch signal of signal detection circuit, is used to indicate the output situation of device for geometric proportion driven power supplying.
The present invention proposes a kind of control device of power supply unit, comprises one first back coupling input, one first amplifier out, a soft start input, one first output, one second output and a mains switch input.First feedbacks first input that input is connected to first amplifier, and wherein first feedbacks the output that input more is coupled to power supply unit, feedbacks control so that first group of power supply unit to be provided.First amplifier out is coupled to the output of this first amplifier, compensates to provide to feedback.The soft start input is connected to the soft start capacitor device, is used to set the soft-start time of power supply unit.This soft start input more is coupled to second input of first amplifier, to provide first amplifier one reference voltage.First output and second output are exported first output signal and second output signal respectively.This first output signal and second output signal are to produce according to the output of first amplifier, and couple drive first diverter switch and second diverter switch.Wherein, first diverter switch is connected and switches the transformer of this power supply unit with second diverter switch, and then controls the output of power supply unit.The mains switch input receives power switch signal and is connected to power switch circuit, is used to open and close this power supply unit.
The present invention reintroduces a kind of control device of power supply unit, comprises voltage input end, current sense terminal, a power detecting end, a signal detection end, a mains switch input, a power status indication end and a power protection output.Voltage input end is connected to excess voltage protection and under-voltage protection circuit, is used to detect the overvoltage condition and the low-voltage state of the output voltage of power supply unit.Current sense terminal its voltage input end of arranging in pairs or groups is connected to circuit overcurrent protection, is used to detect the overcurrent condition of the output current of power supply unit.The power detecting end is connected to the overpower protection circuit, is used to detect the power output of power supply unit.The signal detection end is coupled to the transformer and the signal detection circuit of power supply unit, is used to detect the voltage of signals position standard of transformer.The mains switch input receives power switch signal and is connected to power switch circuit, is used to open and close power supply unit.The power status indication end produces the output situation of a power status signal with the indication power supply unit according to the output of excess voltage protection and under-voltage protection circuit, the output and the power switch signal of signal detection circuit.The power protection output produces a power protection signal according to excess voltage protection, under-voltage protection circuit, circuit overcurrent protection and overpower protection circuit, is used to open and close power supply unit.
The present invention is because of providing the control and the protective circuit of complete device for geometric proportion driven power supplying; therefore can high efficiency, control the output of device for geometric proportion driven power supplying at low cost; protect device for geometric proportion driven power supplying and load circuit thereof, and can indicate the output situation of this power supply unit by the power status signal.
Via as can be known above-mentioned, the invention relates to a kind of control device of device for geometric proportion driven power supplying, include feedback control circuit, so that the back coupling control of power supply unit to be provided.The soft start input is used to set the soft-start time of power supply unit.First output and second output are used to export first output signal and second output signal one first diverter switch and one second diverter switch with the couple drive power supply unit, and then the output of control power supply unit.One protected location has possessed voltage input end, current sense terminal, power detecting end and signal detection end.This signal detection end is used to detect transformer voltage of signals position standard.The mains switch input receives a power switch signal, is used to open and close power supply unit.The power status indication end produces a power status signal, is used to indicate the output situation of power supply unit.
Above-mentioned explanation only is the general introduction of technical solution of the present invention, for can clearer understanding technological means of the present invention, and can be implemented according to the content of specification, and for above-mentioned and other purposes, feature and advantage of the present invention can be become apparent, below especially exemplified by preferred embodiment, and conjunction with figs., be described in detail as follows.
Description of drawings
Fig. 1 is the circuit of general device for geometric proportion driven power supplying.
Fig. 2 A～Fig. 2 F is the work schedule and the state of the device for geometric proportion driven power supplying of key diagram 1 respectively.
Fig. 3 is the control device that a kind of device for geometric proportion driven power supplying is described according to the present invention.
Fig. 4 is for to illustrate a kind of voltage regulator according to the present invention.
Fig. 5 is for to illustrate a kind of oscillator according to the present invention.
Fig. 6 is for to illustrate a kind of protected location according to the present invention.
Fig. 7 illustrates a kind of soft starting circuit according to the present invention.
Fig. 8 illustrates a kind of excess voltage protection according to the present invention.
Fig. 9 illustrates a kind of under-voltage protection circuit according to the present invention.
Figure 10 illustrates a kind of circuit overcurrent protection according to the present invention.
Figure 11 illustrates a kind of overpower protection circuit according to the present invention.
Figure 12 illustrates a kind of interface circuit according to the present invention.
10,20: transformer
31,32,52,62,71～74: diode
33,40,45,81～85,126,225,450: electric capacity
34～36,55,65,92,93,96,98,99,121～123,125,205,515～519,525～529,535,537: impedance
50,51,60,61,110,163,211～217,380: transistor
91,95: inductance
100: voltage regulator
128: controllable
151,152,370,578: flip-flop
156,157,240,245,375,376: and not b gate
158,585: and lock
159,250,371,583,584,586: inverter
160,162,210,430: amplifier
165,230,235,512～514,522～524,532～534,562,563,571,572: comparator
200: oscillator 221,222: switch
300: protected location 310: excess voltage protection
320: circuit overcurrent protection 330: the overpower protection circuit
340: interface circuit 350: the under-voltage protection circuit
361,587: anti-or lock 362,511,521,531: or lock
365,366,510,520,530,560,581: delay circuit
410,420,538～539: current source 575,576: the bounce-back jumping circuit
COM: the first amplifier out e
n～e
1: current sense terminal
IN: the first back coupling input FB: the second back coupling input
OPH: overpower protection signal OPP: power detecting end
OVP: overvoltage protection signal PG: power status indication end
PLS: oscillator signal PSON: mains switch input
RI: frequency of oscillation is set end OUT1: first output
OUT2: the second output S
1: first output signal
S
2: the second output signal SS: soft start input
UVAC: signal detection end UVP: under-voltage protection signal
VA: the second amplifier out V
n～V
l: voltage input end
V
REF: reference voltage V
R0～V
R7: reference level
V
SAW: sawtooth signal V
HWith V
L: the pincers pressure of rationing the power supply
Embodiment
Reach technological means and the effect that predetermined goal of the invention is taked for further setting forth the present invention, below in conjunction with accompanying drawing and preferred embodiment, its embodiment of control device, structure, feature and the effect thereof of the device for geometric proportion driven power supplying that foundation the present invention is proposed, describe in detail as after.
For ease of application of the present invention is described, below all embodiment still continue to use the device for geometric proportion driven power supplying of Fig. 1, as the control target of control device in the embodiments of the invention.Have the knack of the teaching that this skill person can adhere to spirit of the present invention and following all embodiment, and class is pushed into other Power Supplier.
Fig. 3 is the embodiment that a kind of control device of device for geometric proportion driven power supplying is described according to the present invention.Please refer to shown in Figure 3ly, the control device of this device for geometric proportion driven power supplying (hereinafter referred to as power supply unit) comprises that the one the first feedback input IN, the first amplifier out COM, soft start input SS, frequency of oscillation and set end RI, voltage input end V
n～V
1, current sense terminal e
n～e
1, power detecting end OPP, signal detection end UVAC, mains switch input PSON, power status indication end PG, the first output OUT1, the second output OUT2, first amplifier 160, oscillator 200, protected location 300 and output circuit.In present embodiment, output circuit comprises T type flip-flop 151, D flip-flop 152, and not b gate 156 and 157, reaches lock 158, inverter 159, comparator 165 etc.
First feedbacks input IN first input (being negative input at this) that is connected to first amplifier 160.First feedbacks input IN the output of more being coupled to power supply unit, is used to provide first group of back coupling control of power supply unit.The first amplifier out COM is coupled to the output of first amplifier 160, so that the compensation of back coupling stability is provided.Soft starting circuit 400 is connected to soft start capacitor device 450 (being plotted in Fig. 7) via soft start input SS, is used to set the soft-start time of power supply unit.This soft start input SS more is coupled to second input (being positive input at this) of first amplifier 160, to provide first amplifier one reference voltage V
REFOutput circuit is exported the first output signal S according to the output of first amplifier 160 respectively via the first output OUT1 and the second output OUT2
1With the second output signal S
2, with first diverter switch 50 and second diverter switch 60 in coupling and the driving power supply.Wherein first diverter switch 50 and second diverter switch 60 are connected to the transformer 10 of power supply unit, and then the output of control power supply unit.
Voltage input end V
n～V
1, current sense terminal e
n～e
1OPP is coupled to power supply unit with the power detecting end.Signal detection end UVAC is coupled to the transformer 10 of power supply unit.Protected location 300 is connected to voltage input end V
n～V
1(being the output of power supply unit) is with the output voltage of detecting power supply unit.Protected location 300 also is connected to current sense terminal e
n～e
1, with collocation voltage input end V
n～V
1The output current of detecting power supply unit.Protected location 300 more saturating power detecting end OPP are with the power output of detecting power supply unit, and foundation detecting result exports overpower protection signal OPH.Protected location 300 also is connected to signal detection end UVAC, with the voltage of signals position standard of detecting transformer 10.In addition, protected location 300 receives a power switch signal via mains switch input PSON, and exports shutdown signal OFF according to this.Output circuit more determines to open and close power supply unit according to the output of protected location 300.
Wherein, the control device of Fig. 3 is more according to voltage input end V
n～V
1, signal detection end UVAC and mains switch input PSON, and export a power status signal, with the output situation of indication power supply unit via power status indication end PG.
And not b gate 156 and the 157 output first output signal S out of the ordinary
1With the second output signal S
2To the first output OUT1 and the second output OUT2.The input of and not b gate 156 is respectively first output of oscillator signal PLS, overpower protection signal OPH, T type flip-flop 151 and first output of D type flip-flop 152.The input of and not b gate 157 is respectively second output of oscillator signal PLS, overpower protection signal OPH, T type flip-flop 151 and first output of D type flip-flop 152.Therefore, output circuit can determine the first output signal S according to the output of oscillator 200
1With the second output signal S
2Switching frequency.
In addition, the control device of Fig. 3 more includes the second back coupling input FB, controllable 128 and the second amplifier out VA.Controllable 128 comprises second amplifier 162 and transistor 163.Second feedbacks input FB an input (being positive input at this) that is connected to second amplifier 162, and wherein second feedbacks input FB the output that more is couple to power supply unit, so that second group of back coupling input of power supply unit to be provided.The second amplifier out VA is coupled to the output of second amplifier 162 via transistor 163, is used for second group and feedbacks control.Wherein, another input of second amplifier 162 (being negative input at this) is to be couple to the first reference level V
R1
Fig. 4 is the voltage regulator circuit that uses controllable 128 to be constituted according to the embodiments of the invention explanation.Please refer to shown in Figure 4ly, this voltage regulator circuit for example can be used as voltage regulator 100 among Fig. 1, and it comprises transistor 110, resistance 121～125, electric capacity 126.In voltage regulator 100, the drain of transistor 110 and source electrode receive voltage E separately
1And generation output voltage V
3The gate of transistor 110 is coupled to voltage E by resistance 123
2The second amplifier out VA is coupled to the gate of transistor 110 and an end of electric capacity 126.The other end of electric capacity 126 then is coupled to the second back coupling input FB by resistance 125.Resistance 121 and 122 is series at output voltage V
3And between the ground connection, the second back coupling input FB then is coupled between resistance 121 and 122.
Fig. 5 is the preferred embodiment of oscillating circuit 200, and wherein resistance 205 is set end RI by frequency of oscillation and is connected to a voltage to current converter.This voltage is made up of amplifier 210, transistor 211 current converter.The second reference level V
R2Be connected to the input (being positive input) of amplifier 210 at this, and the second reference level V
R2Produce a frequency setting electric current with resistance 205.Transistor 212～217 is formed current mirroring circuit, and this current mirroring circuit is in order to produce reference current I
RAnd needed charging current of oscillator and discharging current.Oscillation control circuit is made up of comparator 230,235, and not b gate 240,245 and inverter 250.Oscillation control circuit produces oscillator signal PLS, with control switch 221 and 222.This switch 221 and 222 is controlled charging current and the discharging current to capacitor 225 respectively, and produces sawtooth signal V
SAWThis sawtooth signal V
SAWBe to ration the power supply between pincers to press V
HWith V
LBetween.
Fig. 6 is the preferred embodiment of a protected location 300, includes excess voltage protection 310, under-voltage protection circuit 350, circuit overcurrent protection 320, overpower protection circuit 330, interface circuit 340, power status indicating circuit and power supply exclusive circuit.Excess voltage protection 310 is to be connected to voltage input end V with under-voltage protection circuit 350
n～V
1, whether the output voltage that is used to detect power supply unit is crossed high pressure or is crossed low pressure.
This power status indicating circuit is made up of with transistor 380 anti-or lock 361, and not b gate 375, delay circuit 365, in order to out-put supply status signals V
PGTo power status indication end PG, the output situation of this power status signal indication power supply unit.When power supply unit is exported just often; meaning is that excess voltage protection 310 is not when all detecting the output of overvoltage and low-voltage with under-voltage protection circuit 350; after confirming the time of delay of delay circuit 365, will be via power status indication end PG out-put supply status signals V
PC
As for the power supply exclusive circuit then by or lock 362, and not b gate 376, delay circuit 366, inverter 371, D type flip-flop 370 formed, in order to produce shutdown signal OFF.Mains switch input PSON receives power switch signal, is used to control shutdown signal OFF.When power switch signal is unlocked, will export the first output signal S by shutdown signal OFF
1With the second output signal S
2At this moment, if power supply unit any misoperation takes place will start corresponding protective circuit, and close locking shutdown signal OFF and end the first output signal S
1With the second output signal S
2When power switch signal is closed, with the power status signal V of first powered-down situation indication end PG
PG, and also pass through shutdown signal OFF through replacement D type flip-flop after the time of delay of delay circuit 366 370 and end the first output signal S
1With the second output signal S
2When power switch signal replacement D type flip-flop 370,, and removed the lock-out state that causes by protective circuit simultaneously also with replacement power supply exclusive circuit.
Fig. 7 is the preferred embodiment according to a soft starting circuit 400 of the present invention, and it has comprised that amplifier 430, transistor 435 constitute a clamp amplifying circuit with constant current source 410, and it is used to produce reference voltage V
REFStart capacitor 450 and be connected to constant current source 410 by soft start input SS.When making its conducting, start capacitor 450 thereby by short circuit when shutdown signal OFF control switch 462, so reference voltage V
REFVoltage also will equal zero.When shutdown signal OFF control switch 462 it being opened circuit, starting capacitor 450 will be charged by constant current source 410, and reference voltage V
REFAlso will rise gradually with the voltage that starts on the capacitor 450.And finally be clamped at a reference voltage V
R0Accurate position to produce fixing reference voltage V
REF, and be sent to the usefulness of first amplifier 160 for first group of back coupling control.
Soft starting circuit shown in above-mentioned is because of making reference voltage V by feedback loop
REFSoft start, therefore the control of slow and non-each phase place (cycle-by-cycle) of its toggle speed be particularly suitable for the self-excitation positive feedback drive circuit of device for geometric proportion driven power supplying.In addition, the overpower protection signal OPH of the output of power protecting circuit 330 more is coupled to soft start capacitor device 450 by switch 461.When the power output of power supply unit surpasses one the 4th reference level V
R4The time, constant current source 420 will be at 450 discharges of soft start capacitor device, with the peak power output of restriction power supply unit.So, can do protection fully to the output short-circuit of device for geometric proportion driven power supplying.In case therefore the output short-circuit of power supply unit will restart its soft start and export with power-limiting.
Fig. 8 and Fig. 9 are the preferred embodiment of excess voltage protection 310 and under-voltage protection circuit 350.Excess voltage protection 310 comprises first group of strangulation voltage and second group of strangulation voltage respectively with under-voltage protection circuit 350, and " overvoltage " state is that the output voltage of expression power supply unit surpasses first group of strangulation voltage.In addition, on behalf of the output voltage of power supply unit, " low-voltage " state then be lower than second group of strangulation voltage.First group of strangulation voltage is by the 3rd reference level V
R3, 515～519 of resistance reach, cooperate comparator 512～514 with or lock 511 carry out overvoltage protection, second group of strangulation voltage then is by the 3rd reference level V
R3, 525～529 of resistance reach, cooperate comparator 522～524 with or lock 521 carry out under-voltage protection.When " overvoltage " or " low-voltage " situation takes place, protective circuit (310 and 350) will be exported an overvoltage protection signal OVP and a under-voltage protection signal UVP respectively with by the first output signal S after a time of delay
1With the second output signal S
2, and then the powered-down supply.Then be respectively by delay circuit 510 and 520 decisions time of delay.
Figure 10 is the preferred embodiment of circuit overcurrent protection 320, and it includes comparator 532～534, constant current source 538～539, resistance 535～537 or lock 531 and delay circuit 530.Wherein constant current source 538～539 respectively produces a strangulation position standard at voltage E with resistance 535～537
n～E
1(as the voltage E among Fig. 1
1, E
2) and current sense terminal e
n～e
1Between.And the output current of power supply unit process impedance 96,92,93 etc. are at voltage E
n～E
1With voltage input end V
n～V
1Between out of the ordinary make a voltage drop.When voltage drop punctual greater than this strangulation position, comparator will by or time of delay of lock 531 and delay circuit 530 after, by the first output signal S
1With the second output signal S
2, and then the powered-down supply.Therefore, just can change the electric current strangulation position standard of " overcurrent protection " of each group output via the resistance value that changes resistance 535～537.
Figure 11 is the preferred embodiment of overpower protection circuit 330.Comprising comparator 562 and 563, it has respectively possessed the 4th reference level V
R4And the 5th reference level V
R5When the power output of power supply unit surpasses the 5th reference level V
R5The time, overpower protection circuit 330 will be after a time of delay, by the first output signal S
1With the second output signal S
2, and then the powered-down supply.Determined by delay circuit 560 this time of delay.When the power output of power supply unit surpasses the 4th reference level V
R4, this overpower protection circuit 330 will end the first output signal S immediately
1With the second output signal S
2, and then powered-down supply immediately.
Figure 12 illustrates interface circuit 340, and it comprises power switch circuit and signal detection circuit, and wherein this power switch circuit comprises comparator 571, bounce-back jumping circuit (debounce circuit) 575, reaches lock 585 and inverter 583.Comparator 571 has one the 7th reference level V
R7When the voltage level of power switch signal is higher or lower than the 7th reference level V
R7The time, power switch circuit will be after (by the decision of bounce-back jumping circuit 575) be confirmed through the time, via and the signal ON that produced of lock 585 control the first output signal S
1With the second output signal S
2, and then unlatching or powered-down supply.And the signal detection circuit comprises comparator 572, bounce-back jumping circuit 576, anti-or lock 587, inverter 584,586, flip-flop 578 and delay circuit 581.When the signal of transformer 10 is lower than the 6th reference level V
R6The time, will be by the time after (by the decision of bounce-back jumping circuit 576) confirmed, again via signal AOF anti-or that lock 587 is produced its power status signal V that resets
PCPass through inverter 586 in addition, its power switch circuit is being closed the first output signal S
1With the second output signal S
2Before, also will be earlier by signal AOF this power status signal V that resets
PGIn addition, when protective circuit 310,350, circuit overcurrent protection 320 and overpower protection circuit 330 during at the powered-down supply, if the voltage of signals position standard of transformer 10 has been higher than the 6th reference level V
R6, then power supply unit will be closed and locking.But work as protective circuit 310,350, circuit overcurrent protection 320 and overpower protection circuit 330 before the powered-down supply, if the voltage of signals position standard of transformer 10 has been lower than the 6th reference level V
R6, then after power supply unit is closed, and, will restart power supply unit through a time of delay (being determined) by delay circuit 581.This function will be avoided in the process of powered-down supply, because of the misoperation of protective circuit is closed and the locking power supply unit.
The above, it only is preferred embodiment of the present invention, be not that the present invention is done any pro forma restriction, though the present invention discloses as above with preferred embodiment, yet be not in order to limit the present invention, any those skilled in the art, in not breaking away from the technical solution of the present invention scope, when the technology contents that can utilize above-mentioned announcement is made a little change or is modified to the equivalent embodiment of equivalent variations, in every case be the content that does not break away from technical solution of the present invention, according to technical spirit of the present invention to any simple modification that above embodiment did, equivalent variations and modification all still belong in the scope of technical solution of the present invention.
Claims (28)
1, a kind of control device of device for geometric proportion driven power supplying is characterized in that it comprises:
One first back coupling input, the output of being coupled to this device for geometric proportion driven power supplying is in order to provide first group of back coupling control of this device for geometric proportion driven power supplying;
One first amplifier out compensates in order to provide to feedback;
One soft start input is connected to a soft start capacitor device to set the soft-start time of this device for geometric proportion driven power supplying;
One frequency of oscillation is set end, is connected to a resistance;
At least one voltage input end is coupled to this device for geometric proportion driven power supplying;
At least one current sense terminal is coupled to this device for geometric proportion driven power supplying;
One power detecting end is coupled to this device for geometric proportion driven power supplying;
One signal detection end is coupled to a transformer of this device for geometric proportion driven power supplying;
One mains switch input;
One power status indication end;
One first output is used to export one first output signal, with one first diverter switch of this device for geometric proportion driven power supplying of couple drive;
One second output, be used to export one second output signal, one second diverter switch with this device for geometric proportion driven power supplying of couple drive, wherein this first diverter switch is connected and switches the transformer of this device for geometric proportion driven power supplying with this second diverter switch, and then controls the output of this device for geometric proportion driven power supplying;
One first amplifier, its first input is connected to this first back coupling input, this soft start input is coupled in second input of this first amplifier, and the output of this first amplifier is coupled to this first amplifier out, and wherein this soft start input provides this first amplifier, one reference voltage;
One oscillator is connected to this frequency of oscillation and sets end, in order to set its frequency of oscillation according to this resistance;
One protected location, in order to be connected to this voltage input end to detect the output voltage of this device for geometric proportion driven power supplying, be connected to this current sense terminal and detect the output current of this device for geometric proportion driven power supplying with this voltage input end of arranging in pairs or groups, be connected to this power detecting end to detect the power output of this device for geometric proportion driven power supplying, be connected to this signal detection end detecting the voltage of signals position standard of this transformer, and be connected to this mains switch input to receive a power switch signal; And
One output circuit, be electrically connected to this first amplifier, this oscillator, this protected location, this first output and this second output, in order to produce and to provide this first output signal and this second to output signal to this first output and this second output according to the output of this first amplifier, determine the switching frequency of this first output signal and this second output signal according to the output of this oscillator, and determine to open and close this device for geometric proportion driven power supplying according to the output of this protected location; Wherein this control device is more according to this voltage input end, this signal detection end and this mains switch input, and exports a power status signal to indicate the output situation of this device for geometric proportion driven power supplying via this power status indication end.
2, control device according to claim 1 is characterized in that more comprising:
One second back coupling input, the output of being coupled to this device for geometric proportion driven power supplying is in order to provide second group of back coupling control of this device for geometric proportion driven power supplying;
One second amplifier, its first input are connected to this second back coupling input, and second input of this second amplifier is connected to one first reference level; And
One second amplifier out is coupled to the output of this second amplifier, is used for second group and feedbacks control.
3, control device according to claim 1 is characterized in that wherein said protected location comprises:
One voltage protection circuit is connected to this voltage input end, in order to the overvoltage condition and the low-voltage state of the output voltage of detecting this device for geometric proportion driven power supplying;
One circuit overcurrent protection is connected to this current sense terminal, detects the overcurrent condition of the output current of this device for geometric proportion driven power supplying in order to this voltage input end of arranging in pairs or groups;
One overpower protection circuit is connected to this power detecting end, in order to detect the power output of this device for geometric proportion driven power supplying;
One signal detection circuit is connected to this signal detection end, is used to detect the voltage of signals position standard of this transformer; And
One power switch circuit is connected to this mains switch input, in order to receive a power switch signal.
4, control device according to claim 3; it is characterized in that wherein overvoltage condition is to represent a wherein output of this device for geometric proportion driven power supplying to surpass one first group of strangulation voltage; low-voltage state is to represent a wherein output of this device for geometric proportion driven power supplying to be lower than one second group of strangulation voltage; when overvoltage or low-voltage state generation; this voltage protection circuit will end this first output signal and this second output signal after postponing a very first time, and then will close this device for geometric proportion driven power supplying.
5, control device according to claim 3; it is characterized in that wherein overcurrent condition is to represent a wherein output current of this device for geometric proportion driven power supplying to surpass one first group of strangulation position standard; when overcurrent condition takes place; this circuit overcurrent protection will end this first output signal and this second output signal after postponing for one second time, and then will close this device for geometric proportion driven power supplying.
6, control device according to claim 3, it is punctual above one the 5th reference bit to it is characterized in that wherein working as the power output of this device for geometric proportion driven power supplying, this overpower protection circuit will end this first output signal and this second output signal after postponing for one the 3rd time, and then will close this device for geometric proportion driven power supplying; And
When the power output of this device for geometric proportion driven power supplying surpassed one the 4th reference level, this overpower protection circuit ended this first output signal and this second output signal immediately, and then closes this device for geometric proportion driven power supplying immediately.
7, control device according to claim 6; the output that it is characterized in that wherein said overpower protection circuit more is coupled to this soft start capacitor device; when surpassing the 4th reference level with power output at this device for geometric proportion driven power supplying; this soft start capacitor device discharge of this overpower protection circuit military order is to limit the peak power output of this device for geometric proportion driven power supplying.
8, control device according to claim 3 is characterized in that wherein when the voltage of signals position of this transformer standard is lower than one the 6th reference level, this signal detection circuit this power status signal of will resetting after postponing for one the 4th time.
9, control device according to claim 3 is characterized in that wherein
When the voltage level of this power switch signal is higher or lower than one the 3rd reference level, this power switch circuit will be after the affirmation through one the 5th time, control this first output signal and this second output signal, and then open or close this device for geometric proportion driven power supplying; And
This power switch circuit before closing this first output signal and this second output signal, this power status signal of resetting earlier.
10, control device according to claim 3 is characterized in that wherein
When this voltage protection circuit, this circuit overcurrent protection and this overpower protection circuit when closing this device for geometric proportion driven power supplying, if the voltage of signals position standard of this transformer is higher than the 6th reference level, then this device for geometric proportion driven power supplying will be closed; And
Before this voltage protection circuit, this circuit overcurrent protection and this overpower protection circuit are being closed this device for geometric proportion driven power supplying; if the voltage of signals position standard of this transformer has been lower than the 6th reference level; then after this device for geometric proportion driven power supplying is closed after the delay through one the 6th time, this device for geometric proportion driven power supplying will be activated again.
11, a kind of control device of device for geometric proportion driven power supplying is characterized in that it comprises:
One first feedbacks input, is connected to first input of one first amplifier, and wherein this first feedbacks the output that input more is coupled to this device for geometric proportion driven power supplying, provides first group of this device for geometric proportion driven power supplying to feedback control;
One first amplifier out is coupled to the output of this first amplifier, provides to feedback compensation;
One soft start input is connected to a soft start capacitor device, is used to set the soft-start time of this device for geometric proportion driven power supplying; This soft start input more is coupled to second input of this first amplifier, so that this first amplifier, one reference voltage to be provided;
One first output and one second output are used to export one first output signal and one second output signal; This first output signal and this second output signal are to move according to the output of this first amplifier, and couple drive one first diverter switch and one second diverter switch; Wherein this first diverter switch is connected and switches a transformer of this device for geometric proportion driven power supplying with this second diverter switch, and then controls the output of this device for geometric proportion driven power supplying;
At least one voltage input end is connected to a voltage protection circuit, is used to detect the overvoltage condition and the low-voltage state of the output voltage of this device for geometric proportion driven power supplying;
One power detecting end is connected to an overpower protection circuit, is used to detect the power output of this device for geometric proportion driven power supplying;
One signal detection end is coupled to this transformer and a signal detection circuit, is used to detect the voltage of signals position standard of this transformer;
One mains switch input receives a power switch signal and is connected to a power switch circuit, is used to open and close this device for geometric proportion driven power supplying; And
One power status indication end according to the output of this voltage protection circuit, the output and the power switch signal of this signal detection circuit, produces a power status signal, is used to indicate these output situations than driven power supplying device.
12, control device according to claim 11 is characterized in that more comprising:
One second feedbacks input, is connected to the input of one second amplifier, and wherein this second feedbacks the output that input more is coupled to this device for geometric proportion driven power supplying, provides second group of this device for geometric proportion driven power supplying to feedback control; And
One second amplifier out is coupled to an output of this second amplifier, is used for second group and feedbacks control; Wherein another input of this second amplifier is connected to one first reference level.
13, control device according to claim 11, it is characterized in that wherein said voltage protection circuit comprises one first group of strangulation voltage and one second group of strangulation voltage, and overvoltage condition is to represent the output of power supply unit to surpass this first group of strangulation voltage; In addition, low-voltage state is to represent the output of power supply unit to be lower than this second group of strangulation voltage; When overvoltage condition or low-voltage state generation, this voltage protection circuit will by this first output signal and this second output signal, and then be closed this device for geometric proportion driven power supplying after postponing a very first time.
14, control device according to claim 11 is characterized in that wherein said overpower protection circuit comprises one the 5th reference level and one the 4th reference level; When the power output of this device for geometric proportion driven power supplying surpasses the 5th reference level, this overpower protection circuit will by this first output signal and this second output signal, and then be closed this device for geometric proportion driven power supplying after postponing for one the 3rd time; When the power output of this device for geometric proportion driven power supplying surpasses the 4th reference level, this overpower protection circuit will end this first output signal and this second output signal immediately, and then close this device for geometric proportion driven power supplying immediately.
15, control device according to claim 14; the output that it is characterized in that wherein said overpower protection circuit more is coupled to this soft start capacitor device; when the power output of this device for geometric proportion driven power supplying surpasses the 4th reference level; this soft start capacitor device discharge of this overpower protection circuit military order is to limit the peak power output of this device for geometric proportion driven power supplying.
16, control device according to claim 11 is characterized in that wherein said signal detection circuit comprises one the 6th reference level; When the voltage of signals position of this transformer standard was lower than the 6th reference level, this signal detection circuit will be after postponing for one the 4th time, this power status signal of resetting.
17, control device according to claim 11 is characterized in that wherein said power switch circuit comprises one the 7th reference level; When the voltage level of this power switch signal is higher or lower than the 7th reference level, this power switch circuit will, after affirmation, control this first output signal and this second output signal, and then open or close this device for geometric proportion driven power supplying through one the 5th time; Wherein this power switch circuit will elder generation's this power status signal of replacement before this first output signal and this second output signal.
18, control device according to claim 11, it is characterized in that wherein said voltage protection circuit and this overpower protection circuit, when the powered-down supply, if transformer voltage of signals position standard is higher than the 6th reference level, then this device for geometric proportion driven power supplying will be closed; But when this voltage protection circuit and this overpower protection circuit; before the powered-down supply; if transformer voltage of signals position standard has been lower than the 6th reference level; then after this device for geometric proportion driven power supplying is closed; after the delay through one the 6th time, this device for geometric proportion driven power supplying will be activated again.
19, a kind of control device of power supply unit is characterized in that it comprises:
One first feedbacks input, is connected to first input of one first amplifier, and wherein this first feedbacks the output that input more is coupled to this power supply unit, provides first group of this power supply unit to feedback control;
One first amplifier out is coupled to the output of this first amplifier, provides to feedback compensation;
One soft start input is connected to a soft start capacitor device, is used to set the soft-start time of this power supply unit; This soft start input more is coupled to second input of this first amplifier, so that this first amplifier, one reference voltage to be provided;
One first output and one second output are used to export one first output signal and one second output signal; This first output signal and this second output signal are to move according to the output of this first amplifier, and couple drive one first diverter switch and one second diverter switch; Wherein this first diverter switch is connected and switches a transformer of this power supply unit with this second diverter switch, and then controls the output of this power supply unit; And
One mains switch input receives a power switch signal and is connected to a power switch circuit, is used to open and close this power supply unit.
20, control device according to claim 19 is characterized in that wherein said power switch circuit comprises one the 6th reference level; When the voltage level of power switch signal is higher or lower than the 6th reference level, this power switch circuit will be controlled this first output signal and this second output signal after the affirmation through one the 5th time, and then open or close this power supply unit.
21, a kind of control device of power supply unit is characterized in that it comprises:
At least one voltage input end is connected to a voltage protection circuit, be used to detect this power supply unit output voltage overvoltage condition and low-voltage state;
At least one current sense terminal is connected to a circuit overcurrent protection, and this voltage input end of arranging in pairs or groups is used to detect the overcurrent condition of the output current of this power supply unit;
One power detecting end is connected to an overpower protection circuit, is used to detect the power output of this power supply unit;
One signal detection end is coupled to a transformer and a signal detection circuit of this power supply unit, to detect the voltage of signals position standard of this transformer;
One mains switch input receives a power switch signal and is connected to a power switch circuit, is used to open and close this power supply unit;
One power status indication end according to the output of the output of this voltage protection circuit, this signal detection circuit and power switch signal and produce a power status signal, is used to indicate the output situation of this power supply unit; And
One power protection output produces a power protection signal according to this voltage protection circuit, this circuit overcurrent protection and this overpower protection circuit, is used to close this power supply unit.
22, control device according to claim 21 is characterized in that wherein said voltage protection circuit comprises first group of strangulation voltage and second group of strangulation voltage, and overvoltage condition is to represent the output of this power supply unit to surpass first group of strangulation voltage; In addition, low-voltage state is to represent the output of this power supply unit to be lower than second group of strangulation voltage; When overvoltage condition or low-voltage state generation, this voltage protection circuit will produce this power protection signal, and then close this power supply unit after postpone the very first time.
23, control device according to claim 21 is characterized in that wherein said circuit overcurrent protection comprises one first group of strangulation position standard, and overcurrent condition is to represent the output current of this power supply unit to surpass this first group of strangulation position standard; When overcurrent condition took place, this circuit overcurrent protection will produce this power protection signal, and then close this power supply unit after postpone for one second time.
24, control device according to claim 21 is characterized in that wherein said overpower protection circuit comprises one the 5th reference level and one the 4th reference level; When the power output of this power supply unit surpasses the 5th reference level, this overpower protection circuit will produce a power protection signal, and then close this power supply unit after postpone for one the 3rd time; When the power output of power supply unit surpasses the 4th reference level, this overpower protection circuit will produce this power protection signal immediately, and then close this power supply unit immediately.
25, control device according to claim 24; the output that it is characterized in that wherein said overpower protection circuit more is coupled to this soft start capacitor device; when the power output of this power supply unit surpasses the 4th reference level; this soft start capacitor device discharge of this overpower protection circuit military order is to limit the peak power output of this power supply unit.
26, control device according to claim 21 is characterized in that wherein said signal detection circuit comprises one the 6th reference level; When the voltage of signals position of this transformer standard was lower than the 6th reference level, this signal detection circuit will be after postponing for one the 4th time, this power status signal of resetting.
27, control device according to claim 21 is characterized in that wherein said power switch circuit comprises one the 7th reference level; When the voltage level of this power switch signal was higher or lower than the 7th reference level, this power switch circuit was incited somebody to action, and after the affirmation through one the 5th time, produces this power protection signal, and then opened or close this power supply unit; Wherein this power switch circuit will elder generation's this power status signal of replacement before producing this power protection signal.
28, control device according to claim 21, it is characterized in that wherein said voltage protection circuit, this circuit overcurrent protection and this overpower protection circuit, when the powered-down supply, if transformer voltage of signals position standard is higher than the 6th reference level, then this power supply unit will be closed; But when this voltage protection circuit, this circuit overcurrent protection and this overpower protection circuit; before the powered-down supply; if the voltage of signals position standard of this transformer has been lower than the 6th reference level; then after this power supply unit is closed; after the delay through one the 6th time, this power supply unit will be activated again.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100985127A CN100514827C (en) | 2005-08-31 | 2005-08-31 | Control device for geometric proportion driven power supplying apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100985127A CN100514827C (en) | 2005-08-31 | 2005-08-31 | Control device for geometric proportion driven power supplying apparatus |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1925302A true CN1925302A (en) | 2007-03-07 |
| CN100514827C CN100514827C (en) | 2009-07-15 |
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ID=37817817
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005100985127A Expired - Fee Related CN100514827C (en) | 2005-08-31 | 2005-08-31 | Control device for geometric proportion driven power supplying apparatus |
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| Country | Link |
|---|---|
| CN (1) | CN100514827C (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101425031B (en) * | 2007-10-29 | 2010-07-21 | 英业达股份有限公司 | Multi voltage reference position detection circuit |
| CN102545139A (en) * | 2010-12-07 | 2012-07-04 | 鸿富锦精密工业（深圳）有限公司 | Overcurrent protection device |
| CN104253920A (en) * | 2013-06-28 | 2014-12-31 | 佳能株式会社 | Image forming apparatus |
| CN102545139B (en) * | 2010-12-07 | 2016-11-30 | 重庆凌云工具有限公司 | Overcurrent protective device |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2011160305A1 (en) * | 2010-06-25 | 2011-12-29 | 北京中星微电子有限公司 | Ac-dc power supply converter and current modulation circuit therein |
-
2005
- 2005-08-31 CN CNB2005100985127A patent/CN100514827C/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101425031B (en) * | 2007-10-29 | 2010-07-21 | 英业达股份有限公司 | Multi voltage reference position detection circuit |
| CN102545139A (en) * | 2010-12-07 | 2012-07-04 | 鸿富锦精密工业（深圳）有限公司 | Overcurrent protection device |
| CN102545139B (en) * | 2010-12-07 | 2016-11-30 | 重庆凌云工具有限公司 | Overcurrent protective device |
| CN104253920A (en) * | 2013-06-28 | 2014-12-31 | 佳能株式会社 | Image forming apparatus |
| US9581950B2 (en) | 2013-06-28 | 2017-02-28 | Canon Kabushiki Kaisha | Image forming apparatus with first and second power supply |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100514827C (en) | 2009-07-15 |
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