CN204030994U - Supply module, switching power source chip and switch power supply system - Google Patents
Supply module, switching power source chip and switch power supply system Download PDFInfo
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- CN204030994U CN204030994U CN201420408221.8U CN201420408221U CN204030994U CN 204030994 U CN204030994 U CN 204030994U CN 201420408221 U CN201420408221 U CN 201420408221U CN 204030994 U CN204030994 U CN 204030994U
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Abstract
The utility model relates to a kind of supply module, switching power source chip and switch power supply system.Wherein a kind of supply module, be built in switching power source chip, comprise: a junction field effect transistor, its drain electrode is connected to the DRAIN pin of switching power source chip, its source electrode connects one end of a resistor, connect the collector electrode of one first triode, the other end of its grid termination resistor simultaneously, connect the base stage of the first triode and the drain electrode of switching tube simultaneously; First triode, its emitter is connected to the VCC pin of switching power source chip; One hysteresis loop comparator, the VCC pin of its positive input termination switching power source chip, its negative input termination one reference voltage, its output is connected to the grid of switching tube, with the conducting of control switch pipe and cut-off.Described switching power source chip comprises above-mentioned supply module.Described switch power supply system comprises above-mentioned switching power source chip.The utility model realizes powering to chip power quick startup simultaneously, and decreases peripheral component, is beneficial to miniaturization and the simplification of switch power supply system.
Description
Technical field
The utility model relates to startup in Switching Power Supply, power supply technique field, particularly relates to a kind of AC/DC switching power source chip internal high pressure and starts fast and the supply module of high voltage supply, switching power source chip and switch power supply system.
Background technology
AC/DC Switching Power Supply is a wherein class of Switching Power Supply, and AC exchanges, and DC is direct current, and it obtains energy from electrical network, obtains a high direct voltage through high-voltage rectifying filtering, obtains one or several galvanic current pressure for DC/DC converter at output.
Fig. 1 is the realizing circuit figure of existing AC/DC Switching Power Supply start-up circuit and power supply circuits, is a kind of floating ground high-side driver buck structure shown in Fig. 1.Input AC AC power is connected to two inputs of rectifier bridge 11.Rectifier bridge 11 by after AC rectification through capacitor C1 filtering.The DRAIN pin of switching power source chip 12 meets bus Vbus and holds, and its CS pin connects load circuit 13.Startup resistor R1 mono-termination bus Vbus holds, and passes through an output of described bus Vbus terminating capacitor C1 and rectifier bridge 11, and the R1 other end connects with capacitor C2, connects the power supply VCC pin of switching power source chip 12 simultaneously; Startup resistor R1 and capacitor C2 produces a low-voltage DC makes switching power source chip 12 start.Supplying resistance device R2 mono-termination output voltage Vout holds, and the other end connects with the anode of diode D1, and the negative electrode of diode D1 connects with capacitor C2, connects the VCC pin of switching power source chip 12 simultaneously; Supplying resistance device R2, diode D1 and capacitor C2 form power supply circuits; When switching power source chip 12 has started, output voltage Vout starts to rise, and starts to power to switching power source chip 12 after Vout rises to certain value by power supply circuits.
The shortcoming of above-mentioned existing start-up circuit is: after switching power source chip 12 has started, and hold between chip VCC pin because startup resistor R1 is connected on bus Vbus, both pressure reduction causes R1 consumed power.R1 is less, and toggle speed is faster, but stand-by power consumption is larger; R1 is larger, and stand-by power consumption is less, but toggle speed is slower.Therefore toggle speed and stand-by power consumption need compromise.In typical case, the toggle speed of existing start-up circuit is slow and standby power is high.
The shortcoming of above-mentioned existing power supply circuits is: output voltage Vout just can by power supply circuits to chip power supply after need rising to certain voltage, therefore chip enable complete to Vout arrive certain voltage during this period of time in, chip power VCC declines, so need capacitor C2 larger, otherwise VCC can drop to UVLO(Under Voltage Lock Out, under-voltage locking) below, cause chip constantly to be restarted.Another shortcoming is, cannot realize power supply when Vout voltage is lower.
And existing Switching Power Supply start-up circuit and power supply circuits all realize by external component, add volume and the complexity of system.
Utility model content
The purpose of this utility model is, for prior art breaker in middle power starting circuit and power supply circuits Problems existing, a kind of supply module, switching power source chip and switch power supply system are provided, realize powering to chip power quick startup simultaneously, and all components and parts of described supply module are applicable to being integrated in switching power source chip inside, decrease peripheral component, be beneficial to miniaturization and the simplification of switch power supply system.
For achieving the above object, the utility model provides a kind of supply module, comprising: a junction field effect transistor, one first triode, a switching tube and a hysteresis loop comparator; The drain electrode electricity of described junction field effect transistor is connected to the DRAIN pin of switching power source chip, the source electrode electricity of described junction field effect transistor connects one end of a resistor, electricity connects the collector electrode of described first triode simultaneously, the grid electricity of described junction field effect transistor connects the other end of described resistor, and electricity connects the base stage of described first triode and the drain electrode of described switching tube simultaneously; The emitter electricity of described first triode is connected to the VCC pin of described switching power source chip; The positive input terminal electricity of described hysteresis loop comparator connects the VCC pin of described switching power source chip, the negative input end electricity of described hysteresis loop comparator connects a reference voltage, the output electricity of described hysteresis loop comparator is connected to the grid of described switching tube, to control conducting and the cut-off of described switching tube.
For achieving the above object, the utility model additionally provides a kind of switching power source chip, comprise DRAIN pin and VCC pin, described DRAIN pin is used for electricity connection bus Vbus and holds, described VCC pin is used for electricity and connects an external charging unit, and shown switching power source chip comprises supply module described in the utility model further; The drain electrode electricity of the described junction field effect transistor in described supply module is connected to described DRAIN pin, the emitter electricity of described first triode in described supply module is connected to described VCC pin, and the positive input terminal electricity of the described hysteresis loop comparator in described supply module connects described VCC pin.
For achieving the above object, the utility model additionally provides a kind of switch power supply system, comprise a rectifier bridge, a filter unit and a switching power source chip, two input electricity of described rectifier bridge connect an AC power, described filter unit is attempted by between two outputs of described rectifier bridge, and described switching power source chip comprises supply module described in the utility model; The drain electrode electricity of the described junction field effect transistor in described supply module is connected to the DRAIN pin of described switching power source chip, described DRAIN pin electricity connection bus Vbus holds, and holds electricity to connect an output of described filter unit and described rectifier bridge by described bus Vbus; The emitter electricity of described first triode in described supply module is connected to the VCC pin of described switching power source chip, the positive input terminal electricity of the described hysteresis loop comparator in described supply module connects described VCC pin, described VCC pin electricity connects a charhing unit, and by described charhing unit ground connection.
The utility model has the advantage of: the switch power supply system that the utility model provides can realize starting fast powering to chip power simultaneously, and solve the existing startup of AC/DC Switching Power Supply and the shortcoming of power supply circuits, power supply capacity is strong, and toggle speed is fast; And when output voltage excursion is very large, also can be self-powered.In the switch power supply system that the utility model provides, described supply module is applicable to being integrated in inside chip, is beneficial to miniaturization and the simplification of switch power supply system; Compare with power supply circuits with the existing startup of AC/DC Switching Power Supply, eliminate external component, therefore whole system is more succinct, toggle speed is faster, and stand-by power consumption is lower, powers more flexible.
Accompanying drawing explanation
Fig. 1, the realizing circuit figure of existing AC/DC Switching Power Supply start-up circuit and power supply circuits;
Fig. 2, the schematic diagram of supply module one execution mode described in the utility model;
Fig. 3, the schematic diagram of switch power supply system described in the utility model;
Fig. 4 is the corresponding oscillogram of mode of operation of system shown in Figure 3;
Fig. 5, each voltage waveform view during switch power supply system work described in the utility model.
Embodiment
The supply module, switching power source chip and the switch power supply system that there is provided the utility model below in conjunction with accompanying drawing elaborate.
With reference to figure 2, the schematic diagram of supply module one execution mode described in the utility model.Described supply module comprises: a junction field effect transistor JFET, one first triode Q1, a switching tube M1 and a hysteresis loop comparator CP1.Wherein, switching tube M1 is N-type MOS transistor; Junction field effect transistor is to control the electric current in folded raceway groove with the electric field on PN junction; MOS transistor is to control the electric current in raceway groove with surface field.
The drain electrode electricity of described junction field effect transistor JFET is connected to the DRAIN pin (i.e. the drain electrode of switching power source chip internal power pipe) of switching power source chip; The source electrode electricity of JFET connects one end of a resistor R, and electricity connects the collector electrode of described first triode Q1 simultaneously; The grid electricity of JFET connects the other end of described resistor R, and electricity connects the base stage of described first triode Q1 and the drain electrode of described switching tube M1 simultaneously.The emitter electricity of described first triode Q1 is connected to the VCC pin (power pins is chip power supply) of described switching power source chip.The positive input terminal electricity of described hysteresis loop comparator CP1 connects the VCC pin of described switching power source chip, and the negative input end electricity of CP1 connects a reference voltage Vref, and the output electricity of CP1 is connected to the grid of described switching tube M1, with the conducting of control M1 and cut-off; Wherein, the hysteresis window of described hysteresis loop comparator CP1 is Vhys.The source electrode electricity of described switching tube M1 connects chip ground (IC GND).
When the voltage DRAIN of DRAIN leads ends is higher than the supply voltage VCC of VCC leads ends, and supply voltage VCC lower than reference voltage Vref time, charging current flows to VCC leads ends by JFET and Q1 from DRAIN leads ends; VCC pin outside is connected to electric capacity usually, and this charging current, to this capacitor charging, makes VCC voltage raise gradually.Q1 base current flows through resistor R, causes the source voltage of JFET slightly higher than grid; Now the grid voltage of JFET is higher than VCC voltage, and the current capacity of JFET is very strong; Because big current is to this capacitor charging, VCC voltage can raise the starting resistor threshold value arriving and establish in chip fast, completes chip enable.The utility model realization is powered to chip power quick startup simultaneously, and power supply capacity is strong, and toggle speed is fast, solves the routine startup of AC/DC Switching Power Supply and the shortcoming of power supply circuits.And all components and parts of described supply module are applicable to being integrated in switching power source chip inside, decrease peripheral component; During for switch power supply system, be beneficial to miniaturization and the simplification of switch power supply system.
As preferred embodiment, described supply module comprises further: one second triode Q2; The collector electrode electricity of described second triode Q2 connects the collector electrode of described first triode Q1, and the base stage electricity of Q2 connects the emitter of Q1, and the emitter electricity of Q2 is connected to VCC pin.If switching power source chip power consumption is comparatively large, two triodes can be adopted to form Darlington transistor, and the emitter electricity of Darlington transistor is connected to VCC pin, and the base stage electricity of Darlington transistor connects the grid of junction field effect transistor JFET and the drain electrode of switching tube M1.Darlington transistor is exactly that two triodes are connected together, polarity only recognizes triode above, triode power is generally than triode is little below above, transistor base is Darlington transistor base stage above, triode emission very Darlington transistor emitter below, usage is the same with triode, and multiplication factor is the product of two triode multiplication factors.
As preferred embodiment, described supply module comprises further: one first diode D1 and one second diode D2, using as forward conduction, reverse resistance to voltage device.The source electrode electricity of described junction field effect transistor JFET connects the anode of described first diode D1, and is connected to the collector electrode of described first triode Q1 by described first diode D1 electricity; The grid electricity of described junction field effect transistor JFET connects the anode of described second diode D2, and is connected to the base stage of described first triode Q1 by described second diode D2 electricity.If switching power source chip VCC output voltage is higher, need the VCC electric current preventing VCC leads ends to pour in down a chimney into DRAIN leads ends, otherwise power supply can be not enough, causes chip repeatedly to be restarted.Diode D1 and D2 is as forward conduction, and reverse resistance to voltage device, makes VCC can work in higher voltage.In the utility model, Darlington transistor and diode D1 can be used for preventing electric current from pouring in down a chimney, and are used as reverse resistance to voltage device simultaneously.If VCC output voltage is lower, can not D1 and D2 be set.D1 and D2 can realize with actual diode, but is not limited to actual diode, such as, can realize with the triode of base-collector junction short circuit.
With reference to figure 3, the schematic diagram of switch power supply system described in the utility model, shown in Fig. 3, topology is similar to Fig. 1, is all floating ground high-side driver buck structure.Described switch power supply system comprises rectifier bridge 31, filter unit and a switching power source chip 32.
Two input electricity of described rectifier bridge 31 connect an AC power AC, output welding system ground (System GND) of described rectifier bridge 31; Described filter unit is attempted by between two outputs of described rectifier bridge 31, rectifier bridge 31 by after AC rectification through filtering unit filters.In the present embodiment, described filter unit adopts capacitor C1, and in other embodiments, described filter unit also can adopt other filtering mode to carry out filtering to the direct current after rectifier bridge 31 rectification.
The DRAIN pin electricity connection bus Vbus of described switching power source chip 32 holds, and holds electricity to connect an output of described filter unit and described rectifier bridge 31 by described bus Vbus; The VCC pin of described switching power source chip 32 connects chip ground (IC GND) by a charhing unit electricity; The FB pin of described switching power source chip 32 meets output voltage terminal Vout by a component piezoresistance; The CS pin of described switching power source chip 32 connects load circuit 33.In the present embodiment, described charhing unit adopts a capacitor C2; In other embodiments, described charhing unit also can adopt electric capacity and resistor coupled in parallel, or the mode such as two Capacitance parallel connections, can select flexibly according to cost and system requirements.Wherein, chip ground (IC GND) voltage is floating voltage.
Described switching power source chip 32 comprises a supply module further; A kind of circuit implementations of described supply module as shown in Figure 2.The drain electrode electricity of the described junction field effect transistor JFET in described supply module is connected to described DRAIN pin; The emitter electricity of the described first triode Q1 in described supply module is connected to described VCC pin, and the positive input terminal electricity of the described hysteresis loop comparator CP1 in described supply module connects described VCC pin.
As preferred embodiment, described supply module comprises further: one second triode Q2; The collector electrode electricity of described second triode Q2 connects the collector electrode of described first triode Q1, and the base stage electricity of Q2 connects the emitter of Q1, and the emitter electricity of Q2 is connected to VCC pin.If switching power source chip power consumption is comparatively large, two triodes can be adopted to form Darlington transistor, and the emitter electricity of Darlington transistor is connected to VCC pin, and the base stage electricity of Darlington transistor connects the grid of junction field effect transistor JFET and the drain electrode of switching tube M1.
As preferred embodiment, described supply module comprises further: one first diode D1 and one second diode D2, using as forward conduction, reverse resistance to voltage device.The source electrode electricity of described junction field effect transistor JFET connects the anode of described first diode D1, and is connected to the collector electrode of described first triode Q1 by described first diode D1 electricity; The grid electricity of described junction field effect transistor JFET connects the anode of described second diode D2, and is connected to the base stage of described first triode Q1 by described second diode D2 electricity.If switching power source chip VCC output voltage is higher, need the VCC electric current preventing VCC leads ends to pour in down a chimney into DRAIN leads ends, otherwise power supply can be not enough, causes chip repeatedly to be restarted.Diode D1 and D2 is as forward conduction, and reverse resistance to voltage device, makes VCC leads ends can work in higher voltage.In the utility model, Darlington transistor and diode D1 can be used for preventing electric current from pouring in down a chimney, and are used as reverse resistance to voltage device simultaneously.If VCC leads ends output voltage is lower, can not D1 and D2 be set.D1 and D2 can realize with actual diode, but is not limited to actual diode, such as, can realize with the triode of base-collector junction short circuit.
The switch power supply system that the utility model provides can realize starting fast powering to chip power simultaneously, and solve the existing startup of AC/DC Switching Power Supply and the shortcoming of power supply circuits, power supply capacity is strong, and toggle speed is fast; And when output voltage excursion is very large, also can be self-powered.In the switch power supply system that the utility model provides, described supply module is applicable to being integrated in inside switching power source chip, is beneficial to miniaturization and the simplification of switch power supply system; Compare with power supply circuits with the existing startup of the Switching Power Supply of AC/DC shown in Fig. 1, eliminate external component: resistor R1, resistor R2 and diode D1; Therefore whole system is more succinct, toggle speed is faster, and stand-by power consumption is lower, powers more flexible.
Below in conjunction with accompanying drawing 2-3, the operation principle of switch power supply system described in the utility model is described.Switch power supply system described in the utility model works in two kinds of mode of operations: charge mode (as shown in Figure 4 pattern one), stopping charge mode (as shown in Figure 4 pattern two).During normal work, pattern one and pattern two alternately occur, waveform as shown in Figure 4.
Charge mode (pattern one): the DRAIN leads ends voltage of the switching power source chip 32 that this pattern is corresponding is high pressure (higher than chip power voltage VCC), and chip power voltage VCC is lower than reference voltage Vref; In the present embodiment, time initial, VCC voltage is identical with chip ground (IC GND) voltage.Electric current flows to VCC leads ends by JFET, D1 and Q2 from DRAIN leads ends, charges, VCC leads ends VCC voltage is raised gradually to the electric capacity C2 of VCC pin outside.Q1 base current flows through resistor R, causes the source voltage of JFET slightly higher than grid.Now the grid voltage of JFET is higher than VCC leads ends VCC voltage, and the startup of AC/DC switching power source chip is exactly correspond to this kind of pattern; Because JFET current capacity is very strong, big current charges to electric capacity C2, and VCC voltage can raise the starting resistor threshold value arriving and establish in switching power source chip 32 fast, completes chip enable.
Stop charge mode (pattern two): the supply voltage VCC overvoltage that this pattern is corresponding, higher than reference voltage Vref, the base-emitter of Q1 and Q2 knot and diode D2 oppositely withstand voltage.It is high level control M1 conducting that hysteresis loop comparator CP1 exports, and the grid of JFET is moved to ground by M1, and JFET source voltage rises to the pinch-off voltage close to JFET.The Darlington transistor that Q1 and Q2 is formed works in cut-off state, therefore does not have electric current to flow to VCC leads ends from JFET; Due to switching power source chip 32 power consumption, VCC voltage declines gradually, just starts again to enter charge mode until reply charge threshold voltage (Vref-Vhys).Under normal circumstances, VCC voltage can fluctuate between reference voltage Vref and charge threshold voltage (Vref-Vhys).
With reference to figure 5, each voltage waveform view during switch power supply system work described in the utility model.Switch power supply system described in the utility model, in above-mentioned two kinds of mode of operations, all will prevent electric current from pouring in down a chimney into DRAIN leads ends from VCC leads ends.In real system application, such as, in the application of Fig. 2, when the pipe conducting of switching power source chip internal power, DRAIN voltage close to chip ground (IC GND) voltage, lower than VCC operating voltage, as shown in Figure 5.This situation needs to prevent VCC leads ends electric current from pouring in down a chimney into DRAIN leads ends, otherwise power supply can be not enough, causes switching power source chip 32 repeatedly to be restarted.In the utility model, Darlington transistor and diode D1 are just being used to prevent electric current from pouring in down a chimney, and are used as reverse resistance to voltage device simultaneously.
The above is only preferred implementation of the present utility model; it should be pointed out that for those skilled in the art, under the prerequisite not departing from the utility model principle; can also make some improvements and modifications, these improvements and modifications also should be considered as protection range of the present utility model.
Claims (9)
1. a supply module, is built in switching power source chip, it is characterized in that, comprising: a junction field effect transistor, one first triode, a switching tube and a hysteresis loop comparator;
The drain electrode electricity of described junction field effect transistor is connected to the DRAIN pin of switching power source chip, the source electrode electricity of described junction field effect transistor connects one end of a resistor, electricity connects the collector electrode of described first triode simultaneously, the grid electricity of described junction field effect transistor connects the other end of described resistor, and electricity connects the base stage of described first triode and the drain electrode of described switching tube simultaneously;
The emitter electricity of described first triode is connected to the VCC pin of described switching power source chip;
The positive input terminal electricity of described hysteresis loop comparator connects the VCC pin of described switching power source chip, the negative input end electricity of described hysteresis loop comparator connects a reference voltage, the output electricity of described hysteresis loop comparator is connected to the grid of described switching tube, to control conducting and the cut-off of described switching tube.
2. supply module according to claim 1, is characterized in that, described supply module comprises further: one second triode; The collector electrode electricity of described second triode connects the collector electrode of described first triode, the base stage electricity of described second triode connects the emitter of described first triode, and the emitter electricity of described second triode is connected to the VCC pin of described switching power source chip.
3. supply module according to claim 1 and 2, is characterized in that, described supply module comprises further: one first diode and one second diode, using as forward conduction, reverse resistance to voltage device; The source electrode electricity of described junction field effect transistor connects the anode of described first diode, and is connected to the collector electrode of described first triode by described first diode electricity; The grid electricity of described junction field effect transistor connects the anode of described second diode, and is connected to the base stage of described first triode by described second diode electricity.
4. a switching power source chip, comprise DRAIN pin and VCC pin, described DRAIN pin is used for electricity connection bus Vbus and holds, and described VCC pin is used for electricity and connects an external charging unit, it is characterized in that, comprise supply module according to claim 1 further;
The drain electrode electricity of the described junction field effect transistor in described supply module is connected to described DRAIN pin, the emitter electricity of described first triode in described supply module is connected to described VCC pin, and the positive input terminal electricity of the described hysteresis loop comparator in described supply module connects described VCC pin.
5. switching power source chip according to claim 4, is characterized in that, described supply module comprises further: one second triode; The collector electrode electricity of described second triode connects the collector electrode of described first triode, the base stage electricity of described second triode connects the emitter of described first triode, and the emitter electricity of described second triode is connected to the VCC pin of described switching power source chip.
6. the switching power source chip according to claim 4 or 5, is characterized in that, described supply module comprises further: one first diode and one second diode, using as forward conduction, reverse resistance to voltage device; The source electrode electricity of described junction field effect transistor connects the anode of described first diode, and is connected to the collector electrode of described first triode by described first diode electricity; The grid electricity of described junction field effect transistor connects the anode of described second diode, and is connected to the base stage of described first triode by described second diode electricity.
7. a switch power supply system, comprise a rectifier bridge, a filter unit and a switching power source chip, two input electricity of described rectifier bridge connect an AC power, described filter unit is attempted by between two outputs of described rectifier bridge, it is characterized in that, described switching power source chip comprises supply module according to claim 1;
The drain electrode electricity of the described junction field effect transistor in described supply module is connected to the DRAIN pin of described switching power source chip, described DRAIN pin electricity connection bus Vbus holds, and holds electricity to connect an output of described filter unit and described rectifier bridge by described bus Vbus;
The emitter electricity of described first triode in described supply module is connected to the VCC pin of described switching power source chip, the positive input terminal electricity of the described hysteresis loop comparator in described supply module connects described VCC pin, described VCC pin electricity connects a charhing unit, and by described charhing unit ground connection.
8. switch power supply system according to claim 7, is characterized in that, described supply module comprises further: one second triode; The collector electrode electricity of described second triode connects the collector electrode of described first triode, the base stage electricity of described second triode connects the emitter of described first triode, and the emitter electricity of described second triode is connected to the VCC pin of described switching power source chip.
9. the switch power supply system according to claim 7 or 8, is characterized in that, described supply module comprises further: one first diode and one second diode, using as forward conduction, reverse resistance to voltage device; The source electrode electricity of described junction field effect transistor connects the anode of described first diode, and is connected to the collector electrode of described first triode by described first diode electricity; The grid electricity of described junction field effect transistor connects the anode of described second diode, and is connected to the base stage of described first triode by described second diode electricity.
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| CN201420408221.8U CN204030994U (en) | 2014-07-23 | 2014-07-23 | Supply module, switching power source chip and switch power supply system |
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| CN201420408221.8U CN204030994U (en) | 2014-07-23 | 2014-07-23 | Supply module, switching power source chip and switch power supply system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105246207A (en) * | 2015-10-30 | 2016-01-13 | 上海晶丰明源半导体有限公司 | Starting circuit of chip, LED driver, LED drive circuit, and starting method of chip |
| CN109787482A (en) * | 2018-04-04 | 2019-05-21 | 深圳市必易微电子有限公司 | Control chip and control method, constant pressure and flow device and isolation flyback PWM system |
-
2014
- 2014-07-23 CN CN201420408221.8U patent/CN204030994U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105246207A (en) * | 2015-10-30 | 2016-01-13 | 上海晶丰明源半导体有限公司 | Starting circuit of chip, LED driver, LED drive circuit, and starting method of chip |
| CN105246207B (en) * | 2015-10-30 | 2018-03-20 | 上海晶丰明源半导体股份有限公司 | The start-up circuit of chip, LED driver, the startup method of LED drive circuit and chip |
| CN109787482A (en) * | 2018-04-04 | 2019-05-21 | 深圳市必易微电子有限公司 | Control chip and control method, constant pressure and flow device and isolation flyback PWM system |
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| CP03 | Change of name, title or address | ||
| CP03 | Change of name, title or address |
Address after: 5 room 504-511, room 2, Lane 666, Zhang Heng Road, Pudong New Area, China (Shanghai) free trade zone, Shanghai, China () Patentee after: Shanghai semiconducto Limited by Share Ltd Address before: Bi Sheng Lu Pudong New Area Zhangjiang hi tech park Shanghai 201204 Lane 299 No. 10 3 floor Patentee before: Shanghai Bright Power Semiconductor Co.,Ltd. |