CN202738189U - LED (Light Emitting Diode) driver and DC/DC (Direct Current to Direct Current) boost converter - Google Patents
LED (Light Emitting Diode) driver and DC/DC (Direct Current to Direct Current) boost converter Download PDFInfo
- Publication number
- CN202738189U CN202738189U CN 201220317949 CN201220317949U CN202738189U CN 202738189 U CN202738189 U CN 202738189U CN 201220317949 CN201220317949 CN 201220317949 CN 201220317949 U CN201220317949 U CN 201220317949U CN 202738189 U CN202738189 U CN 202738189U
- Authority
- CN
- China
- Prior art keywords
- output
- driver element
- supply voltage
- power transistors
- voltage
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn - After Issue
Links
Images
Landscapes
- Dc-Dc Converters (AREA)
Abstract
The utility model provides an LED (Light Emitting Diode) driver and a DC/DC (Direct Current to Direct Current) boost converter. The LED driver comprises a power supply input terminal, an enable terminal, a feedback terminal, an output power transistor, an output power transistor drive unit and an LED drive unit, wherein the output power transistor drive unit comprises a power supply voltage output drive unit and a charge pump boost output drive unit, the power supply voltage output drive unit is used for providing a drive signal based on power supply voltage for the output power transistor when the power supply voltage is higher than or equal to a preset reference voltage value, the charge pump boost output drive unit is used for providing a boosted drive signal for the output power transistor when the power supply voltage is lower than the preset reference voltage, and the LED drive unit is used for sending a drive signal to the output power transistor drive unit according to the power supply voltage, an enable signal and a feedback signal. The LED driver and the DC/DC boost converter have the advantages that the problem that the work efficiency of an output transistor may be reduced due to the drop of the power supply voltage in related arts is solved, and the normal work can be still realized when the input voltage is lower.
Description
Technical field
The utility model relates to electric field, in particular to a kind of led driver and DC/DC boost converter.
Background technology
Led driver or DC/DC boost converter have a wide range of applications in portable electric appts, such as mobile phone, MP3/MP4, GPS etc.Portable electric appts adopts powered battery usually, in actual applications, battery power supply system is because its kind and combination are more, can produce different output voltages, can provide 0.9V voltage, two joint AA dry cell series connection can provide 1.8V, lithium battery that 4.2V voltage etc. can be provided such as single-unit AA dry cell, so integrated circuit (IC) chip need wide as far as possible operating voltage range to satisfy different battery varieties and the application of combination; On the other hand, its supply power voltage can descend to some extent after battery uses a period of time, can be down to 3.6V from 4.2V such as lithium battery voltage, single-unit AA dry cell voltage can be down to 0.8V etc. from 0.9V, this also requires integrated circuit (IC) chip that alap minimum operating voltage is arranged, and still can work when battery power supply system voltage is lower than rated output voltage.
Existing led driver or DC/DC step-up converter circuit are as shown in Figure 1; wherein major part is that LED driver element or DC/DC boost conversion unit, output power transistors and driver element thereof form; wherein; LED driver element or DC/DC boost conversion unit comprise main functional circuit, as: enable circuits, reference voltage and reference current generating circuit, feedback circuit, error amplifier, pulsewidth circuit for regulating and controlling, current-limiting circuit, hot cut-off protection circuit and other circuit etc.
The peripheral component of DC/DC boost converter or led driver mainly comprises input supply voltage Vin, inputs and remove lotus root capacitor C in, inductance L, Schottky diode D, divider resistance R1, R2, output capacitance Cout etc.
As shown in Figure 1, output voltage V out is by divider resistance R1, R2 feeds back in led driver or the DC/DC boost converter, output voltage feedback signal is through comparison and the amplification of DC/DC step-up converter circuit unit or led driver circuit unit, and produce an output power transistors drive control signal with other clock signal etc. is common, whether the conducting of controlling the power output pipe by the output power transistors driver element and then realizes that output voltage stabilization is on set point.
Above-mentioned led driver or DC/DC boost converter have a minimum operational voltage value usually based on the reason of manufacturing process and circuit structure, when input supply voltage is crossed when low, circuit reduces owing to low supply voltage causes excessive its operating efficiency that makes of power output pipe conducting resistance, even cisco unity malfunction.In the situation that technique and circuit structure are determined, this minimum operating voltage will be difficult to reduce again.Take nmos pass transistor as example, the conducting resistance Ron=1/ of nmos pass transistor ((μ nCoxW/L) * (Vgs-V)), wherein Vgs is generally equal to or less than power source voltage Vcc, the lower then conducting resistance of supply voltage is higher as can be known from formula, relative consumption was also high in the power consumption of this transistor (electric current constant situation under) when the conducting resistance of output power transistors was large, its operating efficiency also decreases, this be we do not wish to see.When supply voltage continues to drop to a certain minimum voltage, conducting resistance will increase to transistor can't be worked, and this minimum voltage value also becomes the main restricting factor of the minimum input voltage range of whole integrated circuit (IC) chip.
The output power transistors operating efficiency that may cause when supply voltage reduces for led driver in the correlation technique or DC/DC boost converter reduces or the problem of cisco unity malfunction, not yet proposes at present effective solution.
The utility model content
The utility model provides a kind of led driver and DC/DC boost converter, to solve output power transistors operating efficiency reduction that led driver in the correlation technique or DC/DC boost converter may cause or the problem of cisco unity malfunction when supply voltage reduces.
According to one side of the present utility model, a kind of led driver is provided, comprising: power input; Enable Pin; Feedback end; Output power transistors; The output power transistors driver element, be connected between LED driver element and the output power transistors, comprise supply voltage output driver element and the charge pump output driver element that boosts, wherein, supply voltage output driver element is used for providing output power transistors take supply voltage as basis to drive signal to output power transistors at the voltage of power input during more than or equal to default reference voltage level, and the charge pump output driver element that boosts is used for providing output power transistors boost after to drive signal to output power transistors at the voltage of power input during less than default reference voltage level; And LED driver element, be connected with power input, Enable Pin, feedback end and output power transistors driver element, send drive control signal for the enable signal of the supply voltage of inputting according to power input and/or Enable Pin input and/or the feedback signal of feedback end input to the output power transistors driver element.
Further, this driver also comprises: reference voltage generating circuit is used for providing default reference voltage level; And voltage comparator, first input end is connected with power input, and the second input is connected with the output of reference voltage generating circuit, for the size of the supply voltage that compares power input with the reference voltage level of presetting.
Further, this driver also comprises: numerical control switch, input is connected with the LED driver element, output is connected in supply voltage output driver element or the charge pump output driver element that boosts, control end links to each other with the output of voltage comparator, wherein, when the voltage of power input during more than or equal to default reference voltage level, numerical control switch is with the LED driver element and supply voltage output driver element is conducted so that supply voltage is exported driver element to the output power transistors output drive signal, when the voltage of power input during less than default reference voltage level, numerical control switch is conducted LED driver element and the charge pump output driver element that boosts, and the output driver element provides the driving signal to output power transistors so that charge pump boosts.
According to another aspect of the present utility model, a kind of DC/DC boost converter is provided, comprising: power input; Enable Pin; Feedback end; Output power transistors; The output power transistors driver element, be connected between DC/DC boost conversion unit and the output power transistors, comprise supply voltage output driver element and the charge pump output driver element that boosts, wherein, supply voltage output driver element is used for providing output power transistors take supply voltage as basis to drive signal to output power transistors at the voltage of power input during more than or equal to default reference voltage level, and the charge pump output driver element that boosts is used for providing output power transistors boost after to drive signal to output power transistors at the voltage of power input during less than default reference voltage level; And DC/DC boost conversion unit, be connected with power input, Enable Pin, feedback end and output power transistors driver element, send drive control signal for the enable signal of the supply voltage of inputting according to power input and/or Enable Pin input and/or the feedback signal of feedback end input to the output power transistors driver element.
Further, this transducer also comprises: reference voltage generating circuit is used for providing default reference voltage level; And voltage comparator, first input end is connected with power input, and the second input is connected with the output of reference voltage generating circuit, for the size of the supply voltage that compares power input with the reference voltage level of presetting.
Further, this transducer also comprises: numerical control switch, input is connected with DC/DC boost conversion unit, output is connected in supply voltage output driver element or the charge pump output driver element that boosts, control end links to each other with the output of voltage comparator, wherein, when the voltage of power input during more than or equal to default reference voltage level, numerical control switch is with DC/DC boost conversion unit and supply voltage output driver element is conducted so that supply voltage is exported driver element to the output power transistors output drive signal, when the voltage of power input during less than default reference voltage level, numerical control switch is conducted DC/DC boost conversion unit and the charge pump output driver element that boosts, and the output driver element provides the driving signal to output power transistors so that charge pump boosts.
In the utility model, increase can realize the charge pump of the booster tension output driver element that boosts, when supply voltage is low, improve the final output drive signal voltage of driver element by the charge pump output driver element that boosts, thereby effectively reduce the power transistor conduction resistance value, improved simultaneously the minimum input voltage range of chip, solved that output power transistors operating efficiency that led driver in the correlation technique or DC/DC boost converter may cause reduces or the problem of cisco unity malfunction when supply voltage reduces, be implemented in the effect that input voltage still can the normal operation of assurance system when low.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present utility model, consists of the application's a part, and illustrative examples of the present utility model and explanation thereof are used for explaining the utility model, do not consist of improper restriction of the present utility model.In the accompanying drawings:
Fig. 1 is a kind of preferred circuit structure diagram according to the led driver of correlation technique or DC/DC boost converter;
Fig. 2 is a kind of preferred structural representation according to the utility model embodiment led driver;
Fig. 3 is the another kind of preferred structural representation according to the utility model embodiment led driver;
Fig. 4 is another the preferred structural representation according to the utility model embodiment led driver;
Fig. 5 is a kind of preferred circuit structure diagram according to the utility model embodiment led driver and DC/DC boost converter; And
Fig. 6 is a kind of preferred structural representation according to the utility model embodiment DC/DC boost converter.
Embodiment
Hereinafter also describe in conjunction with the embodiments the utility model in detail with reference to accompanying drawing.Need to prove that in the situation of not conflicting, embodiment and the feature among the embodiment among the application can make up mutually.
Embodiment 1
This preferred embodiment provides a kind of led driver, and Fig. 2 illustrates a kind of preferred structural representation of led driver, and this led driver comprises: power input 102; Enable Pin 104; Feedback end 106; Output power transistors 108; Output power transistors driver element 110, be connected between LED driver element 112 and the output power transistors 108, comprise supply voltage output driver element 1102 and the charge pump output driver element 1104 that boosts, wherein, supply voltage output driver element 1102 is used at the voltage of power input 102 during more than or equal to default reference voltage level, provide the output power transistors take supply voltage as the basis to drive signal to output power transistors 108, the charge pump output driver element 1104 that boosts is used at the voltage of power input 102 during less than default reference voltage level, and the output power transistors after providing 108 to boost to output power transistors drives signal; And LED driver element 112, are connected with the output power transistors driver element with power input 102, Enable Pin 104, feedback end 106 and are connected, be used for sending drive control signal according to the supply voltage of power input 102 inputs and/or the enable signal of Enable Pin 104 inputs and/or the feedback signal of feedback end 106 inputs to output power transistors driver element 110.Wherein, predetermined reference voltage level is exported the reference voltage that charge pump starts in the driver element 1104 for the charge pump that arranges boosts, and this voltage can arrange different values according to the different operating environment of led driver.Specifically, when the voltage of power input 102 during more than or equal to reference voltage level, namely, the value of supply voltage satisfies the condition (or driver output power transistor 108 operating efficiencies are higher) of driver output power transistor 108 conductings, and this moment, led driver was exported driver element 1102 normal outputting drive voltages with driver output power transistor 108 by supply voltage; When the voltage of power input 102 during more than or equal to reference voltage level, namely, the value of supply voltage does not satisfy the condition (or driver output power transistor 108 operating efficiencies are lower) of driver output power transistor 108 conductings, then by charge pump boost output driver element 1104 boost, driving voltage after output is boosted guarantees output power transistors 108 normal operations.
In the utility model, increase can realize the charge pump of the booster tension output driver element that boosts, when supply voltage is low, improve the final output drive signal voltage of driver element by the charge pump output driver element that boosts, thereby effectively reduce the power transistor conduction resistance value, improved simultaneously the minimum input voltage range of chip, solved that led driver may cause in the correlation technique output power transistors operating efficiency reduces or the problem of cisco unity malfunction when supply voltage reduces, be implemented in the effect that input voltage still can the normal operation of assurance system when low.
Preferably, in the utility model, the enhanced charge pump charge pump of output in the driver element that boost only boosts to the boost driving signal of the afterbody in the output driver element of charge pump, and needn't other circuit be boosted, to reduce to greatest extent unnecessary energy consumption and issuable interference.
Of the present utility model one preferred embodiment in, also above-mentioned led driver is optimized, specifically, as shown in Figure 3, above-mentioned led driver also comprises: reference voltage generating circuit 302 is used for providing default reference voltage level; And voltage comparator 304, the first input end of voltage comparator 304 is connected with power input, the second input is connected with the output of reference voltage generating circuit, is used for the size of supply voltage and the predetermined reference voltage level that reference voltage generating circuit is exported of comparison power input.
Above-mentioned preferred embodiment in, a kind of concrete judgment mode that starts charge pump is provided, use voltage comparator that the predetermined reference voltage that supply voltage and reference voltage generating circuit provide is compared, realize driving to output power transistors to realize selecting suitable drive voltage circuit.
Of the present utility model one preferred embodiment in, also above-mentioned led driver has been carried out further optimization, particularly, as shown in Figure 4, above-mentioned led driver also comprises: numerical control switch 402, the input of this numerical control switch 402 is connected with LED driver element 112, output is connected in supply voltage output driver element 1102 or the charge pump output driver element 1104 that boosts, control end links to each other with the output of voltage comparator 304, wherein, when the voltage of power input 102 during more than or equal to default reference voltage level, numerical control switch 402 is with LED driver element 112 and supply voltage output driver element 1102 is conducted so that supply voltage is exported driver element 1102 to output power transistors 108 output drive signals, when the voltage of power input 102 during less than default reference voltage level, numerical control switch 402 is conducted LED driver element 112 and the charge pump output driver element 1104 that boosts, and output driver element 1104 provides the driving signal to output power transistors 108 so that charge pump boosts.Preferably, this numerical control switch can be transistor switch, single-pole double-throw switch (SPDT), also can select other switching device that can realize above-mentioned functions or circuit, such as channel selection circuit, switching tube etc.Above-mentioned preferred embodiment in, realized the boost selection of output driver element of supply voltage output driver element or charge pump by the switching tube that increases.
Of the present utility model one preferred embodiment in, the physical circuit schematic diagram that also provides a kind of led driver to use, as shown in Figure 5, this circuit comprises led driver and peripheral circuit thereof, wherein, this led driver mainly comprises: power input (VCC), voltage output end (SW), Enable Pin (EN), feedback end (FB), led driver inside comprises: reference voltage generating circuit, voltage comparator, LED driver element or DC/DC boost conversion unit, output power transistors and output power transistors driver element form, wherein, the output power transistors driver element is boosted by charge pump and exports driver element and supply voltage output driver element; Peripheral component mainly comprises input supply voltage Vin, inputs and remove lotus root capacitor C in, inductance L, Schottky diode D, divider resistance R1, R2, output capacitance Cout etc.
Wherein, the LED driver element comprises main functional circuit in the circuit of said structure, as: enable circuits, reference voltage and reference current generating circuit, feedback circuit, error amplifier, pulsewidth circuit for regulating and controlling, current-limiting circuit, hot cut-off protection circuit and other circuit etc.
Specifically, the first input end of voltage comparator is connected with power input, the second input is connected with reference voltage generating circuit, be used for comparing the voltage VCC of power input and the size that the predefined charge pump that is provided by reference voltage generating circuit starts reference voltage Vref, as VCC during less than Vref, start the charge pump output driver element that boosts, use charge pump to boost the driving signal voltage of output driver element after boosting as the grid voltage Vg of driver output power transistor, thereby guarantee that output power transistors is still can be with higher efficient normal operation than under the low supply voltage.As VCC during more than or equal to Vref, the charge pump output driver element that boosts does not use, in normal mode with the driving signal of the supply voltage VCC grid voltage Vg as the driver output power tube.
Embodiment 2
This preferred embodiment provides a kind of DC/DC boost converter, and Fig. 6 illustrates a kind of preferred structural representation of DC/DC boost converter, and this DC/DC boost converter comprises: power input 102; Enable Pin 104; Feedback end 106; Output power transistors 108; Output power transistors driver element 110, be connected between DC/DC boost conversion unit 602 and the output power transistors 108, comprise supply voltage output driver element 1102 and the charge pump output driver element 1104 that boosts, wherein, supply voltage output driver element 1102 is used at the voltage of power input 102 during more than or equal to default reference voltage level, provide the output power transistors take supply voltage as the basis to drive signal to output power transistors 108, the charge pump output driver element 1104 that boosts is used at the voltage of power input 102 during less than default reference voltage level, and the output power transistors after providing 108 to boost to output power transistors drives signal; And DC/DC boost conversion unit 602, are connected with the output power transistors driver element with power input 102, Enable Pin 104, feedback end 106 and are connected, be used for sending drive control signal according to the supply voltage of power input 102 inputs and/or the enable signal of Enable Pin 104 inputs and/or the feedback signal of feedback end 106 inputs to output power transistors driver element 110.Wherein, predetermined reference voltage level is exported the reference voltage that charge pump starts in the driver element 1104 for the charge pump that arranges boosts, and this voltage can arrange different values according to the different operating environment of DC/DC boost converter.Specifically, when the voltage of power input 102 during more than or equal to reference voltage level, namely, the value of supply voltage satisfies the condition (or driver output power transistor 108 operating efficiencies are higher) of driver output power transistor 108 conductings, and this moment, the DC/DC boost converter was exported driver element 1102 normal outputting drive voltages with driver output power transistor 108 by supply voltage; When the voltage of power input 102 during more than or equal to reference voltage level, namely, the value of supply voltage does not satisfy the condition (or driver output power transistor 108 operating efficiencies are lower) of driver output power transistor 108 conductings, then by charge pump boost output driver element 1104 boost, driving voltage after output is boosted guarantees output power transistors 108 normal operations.
In the utility model, increase can realize the charge pump of the booster tension output driver element that boosts, when supply voltage is low, improve the final output drive signal voltage of driver element by the charge pump output driver element that boosts, thereby effectively reduce the power transistor conduction resistance value, improved simultaneously the minimum input voltage range of chip, solved that the DC/DC boost converter may cause in the correlation technique output power transistors operating efficiency reduces or the problem of cisco unity malfunction when supply voltage reduces, be implemented in the effect that input voltage still can the normal operation of assurance system when low.
Preferably, in the utility model, the enhanced charge pump charge pump of output in the driver element that boost only boosts to the boost driving signal of the afterbody in the output driver element of charge pump, and needn't other circuit be boosted, to reduce to greatest extent unnecessary energy consumption and issuable interference.
Of the present utility model one preferred embodiment in, also above-mentioned DC/DC boost converter is optimized, specifically, as shown in Figure 6, above-mentioned DC/DC boost converter also comprises: reference voltage generating circuit 302 is used for providing default reference voltage level; And voltage comparator 304, the first input end of voltage comparator 304 is connected with power input, the second input is connected with the output of reference voltage generating circuit, is used for the size of supply voltage and the predetermined reference voltage level that reference voltage generating circuit is exported of comparison power input.
Above-mentioned preferred embodiment in, a kind of concrete judgment mode that starts charge pump is provided, use voltage comparator that the predetermined reference voltage that supply voltage and reference voltage generating circuit provide is compared, realize driving to output power transistors to realize selecting suitable drive voltage circuit.
Of the present utility model one preferred embodiment in, also above-mentioned DC/DC boost converter has been carried out further optimization, particularly, as shown in Figure 6, above-mentioned DC/DC boost converter also comprises: numerical control switch 402, the input of this numerical control switch 402 is connected with DC/DC boost conversion unit 602, output is connected in supply voltage output driver element 1102 or the charge pump output driver element 1104 that boosts, control end links to each other with the output of voltage comparator 304, wherein, when the voltage of power input 102 during more than or equal to default reference voltage level, numerical control switch 402 is with DC/DC boost conversion unit 602 and supply voltage output driver element 1102 is conducted so that supply voltage is exported driver element 1102 to output power transistors 108 output drive signals, when the voltage of power input 102 during less than default reference voltage level, numerical control switch 402 is conducted DC/DC boost conversion unit 602 and the charge pump output driver element 1104 that boosts, and output driver element 1104 provides the driving signal to output power transistors 108 so that charge pump boosts.Preferably, this numerical control switch can be transistor switch, single-pole double-throw switch (SPDT), also can select other switching device that can realize above-mentioned functions or circuit, such as channel selection circuit, switching tube etc.Above-mentioned preferred embodiment in, realized the boost selection of output driver element of supply voltage output driver element or charge pump by the switching tube that increases.
Of the present utility model one preferred embodiment in, the physical circuit schematic diagram that also provides a kind of DC/DC boost converter to use, as shown in Figure 5, this circuit comprises DC/DC boost converter and peripheral circuit thereof, wherein, this DC/DC boost converter mainly comprises: power input (VCC), voltage output end (SW), Enable Pin (EN), feedback end (FB), this DC/DC boost converter inside comprises: reference voltage generating circuit, voltage comparator, LED driver element or DC/DC boost conversion unit, output power transistors and output power transistors driver element form, wherein, the output power transistors driver element is boosted by charge pump and exports driver element and supply voltage output driver element; Peripheral component mainly comprises input supply voltage Vin, inputs and remove lotus root capacitor C in, inductance L, Schottky diode D, divider resistance R1, R2, output capacitance Cout etc.
Wherein, DC/DC boost conversion unit comprises main functional circuit in the circuit of said structure, as: enable circuits, reference voltage and reference current generating circuit, feedback circuit, error amplifier, pulsewidth circuit for regulating and controlling, current-limiting circuit, hot cut-off protection circuit and other circuit etc.
Specifically, the first input end of voltage comparator is connected with power input, the second input is connected with reference voltage generating circuit, be used for comparing the voltage VCC of power input and the size that the predefined charge pump that is provided by reference voltage generating circuit starts reference voltage Vref, as VCC during less than Vref, start the charge pump output driver element that boosts, use charge pump to boost the driving signal voltage of output driver element after boosting as the grid voltage Vg of driver output power transistor, thereby guarantee that output power transistors is still can be with higher efficient normal operation than under the low supply voltage.As VCC during more than or equal to Vref, the charge pump output driver element that boosts does not use, in normal mode with the driving signal of the supply voltage VCC grid voltage Vg as the driver output power tube.
From above description, can find out, the utility model increase can realize the charge pump of the booster tension output driver element that boosts, when supply voltage is low, improve output power transistors and drive signal voltage by the charge pump output driver element that boosts, thereby effectively reduce the power transistor conduction resistance value, improved simultaneously the minimum input voltage range of chip, solved that output power transistors operating efficiency that led driver in the correlation technique or DC/DC boost converter may cause reduces or the problem of cisco unity malfunction when supply voltage reduces, be implemented in the effect that input voltage still can the normal operation of assurance system when low.
The above is preferred embodiment of the present utility model only, is not limited to the utility model, and for a person skilled in the art, the utility model can have various modifications and variations.All within spirit of the present utility model and principle, any modification of doing, be equal to replacement, improvement etc., all should be included within the protection range of the present utility model.
Claims (6)
1. a led driver is characterized in that, comprising:
Power input;
Enable Pin;
Feedback end;
Output power transistors;
The output power transistors driver element, be connected between LED driver element and the described output power transistors, comprise supply voltage output driver element and the charge pump output driver element that boosts, wherein, described supply voltage output driver element is used for providing output power transistors take supply voltage as basis to drive signal to described output power transistors at the voltage of described power input during more than or equal to default reference voltage level, and the described charge pump output driver element that boosts is used for providing output power transistors boost after to drive signal to described output power transistors at the voltage of described power input during less than default reference voltage level; And
Described LED driver element, be connected with described power input, described Enable Pin, described feedback end and the output power transistors driver element of being connected, send drive control signal for the enable signal of the supply voltage of inputting according to described power input and/or the input of described Enable Pin and/or the feedback signal of described feedback end input to described output power transistors driver element.
2. driver according to claim 1 is characterized in that, also comprises:
Reference voltage generating circuit is used for providing described default reference voltage level; And
Voltage comparator, first input end is connected with described power input, and the second input is connected with the output of described reference voltage generating circuit, is used for the size of supply voltage and the described default reference voltage level of more described power input.
3. driver according to claim 2 is characterized in that, also comprises:
Numerical control switch, input is connected with described LED driver element, output is connected in described supply voltage output driver element or the described charge pump output driver element that boosts, control end links to each other with the output of described voltage comparator, wherein, when the voltage of described power input during more than or equal to described default reference voltage level, described numerical control switch is with described LED driver element and described supply voltage output driver element is conducted so that described supply voltage is exported driver element to described output power transistors output drive signal, when the voltage of described power input during less than described default reference voltage level, described numerical control switch is conducted described LED driver element and the described charge pump output driver element that boosts, and the output driver element provides the driving signal to described output power transistors so that described charge pump boosts.
4. a DC/DC boost converter is characterized in that, comprising:
Power input;
Enable Pin;
Feedback end;
Output power transistors;
The output power transistors driver element, be connected between DC/DC boost conversion unit and the described output power transistors, comprise supply voltage output driver element and the charge pump output driver element that boosts, wherein, described supply voltage output driver element is used for providing output power transistors take supply voltage as basis to drive signal to described output power transistors at the voltage of described power input during more than or equal to default reference voltage level, and the described charge pump output driver element that boosts is used for providing output power transistors boost after to drive signal to described output power transistors at the voltage of described power input during less than default reference voltage level; And
Described DC/DC boost conversion unit, be connected with described power input, described Enable Pin, described feedback end and the output power transistors driver element of being connected, send drive control signal for the enable signal of the supply voltage of inputting according to described power input and/or the input of described Enable Pin and/or the feedback signal of described feedback end input to described output power transistors driver element.
5. transducer according to claim 4 is characterized in that, also comprises:
Reference voltage generating circuit is used for providing described default reference voltage level; And
Voltage comparator, first input end is connected with described power input, and the second input is connected with the output of described reference voltage generating circuit, is used for the size of supply voltage and the described default reference voltage level of more described power input.
6. transducer according to claim 5 is characterized in that, also comprises:
Numerical control switch, input is connected with described DC/DC boost conversion unit, output is connected in described supply voltage output driver element or the described charge pump output driver element that boosts, control end links to each other with the output of described voltage comparator, wherein, when the voltage of described power input during more than or equal to described default reference voltage level, described numerical control switch is with described DC/DC boost conversion unit and described supply voltage output driver element is conducted so that described supply voltage is exported driver element to described output power transistors output drive signal, when the voltage of described power input during less than described default reference voltage level, described numerical control switch is conducted described DC/DC boost conversion unit and the described charge pump output driver element that boosts, and the output driver element provides the driving signal to described output power transistors so that described charge pump boosts.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220317949 CN202738189U (en) | 2012-06-29 | 2012-06-29 | LED (Light Emitting Diode) driver and DC/DC (Direct Current to Direct Current) boost converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220317949 CN202738189U (en) | 2012-06-29 | 2012-06-29 | LED (Light Emitting Diode) driver and DC/DC (Direct Current to Direct Current) boost converter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202738189U true CN202738189U (en) | 2013-02-13 |
Family
ID=47663835
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220317949 Withdrawn - After Issue CN202738189U (en) | 2012-06-29 | 2012-06-29 | LED (Light Emitting Diode) driver and DC/DC (Direct Current to Direct Current) boost converter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202738189U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102739044A (en) * | 2012-06-29 | 2012-10-17 | 圣邦微电子（北京）股份有限公司 | DC/DC (direct current) boost converter and LED (light emitting diode) driver |
-
2012
- 2012-06-29 CN CN 201220317949 patent/CN202738189U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102739044A (en) * | 2012-06-29 | 2012-10-17 | 圣邦微电子（北京）股份有限公司 | DC/DC (direct current) boost converter and LED (light emitting diode) driver |
| CN102739044B (en) * | 2012-06-29 | 2015-10-14 | 圣邦微电子（北京）股份有限公司 | DC/DC boost converter and LED driver |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102739044B (en) | DC/DC boost converter and LED driver | |
| US9391467B2 (en) | Step-up battery charging management system and control method thereof | |
| CN101106326B (en) | Dc-dc converter | |
| CN203967969U (en) | A kind of ultralow pressure start-up circuit of synchronous boost DC-DC transducer | |
| CN101202505B (en) | Control circuit for switching regulator,method, electric source and electrical device | |
| CN103475223A (en) | Step-down converter | |
| CN104079157A (en) | Ultra-low voltage starting circuit of synchronous boosting DC-DC converter | |
| CN101228684A (en) | Power supply device and electric device using the same | |
| CN104038040A (en) | Soft turn-off control module, reference signal generation unit, power converter and related control method | |
| CN101404448B (en) | DC-DC converter | |
| CN104661399A (en) | LED constant-current drive circuit based on DC/DC voltage increase-voltage reduction | |
| CN105186859A (en) | Switching converter and method for discharging output terminal thereof | |
| CN101471603B (en) | DC-DC decompression converter and ripple improving circuit | |
| CN110071630A (en) | A kind of conversion circuit and implementation method of seamless switching decompression and straight-through operating mode | |
| CN100392715C (en) | Parallel connection LED drive circuit with adaptive mode switching | |
| CN101527508A (en) | Voltage raising and reducing two-way voltage conversion circuit | |
| TW201414127A (en) | Configurable power supply system | |
| CN109617413A (en) | Boost chip and its mode switching circuit | |
| CN101373930B (en) | DC voltage converting circuit | |
| TW200931778A (en) | Asynchronous boost converter | |
| CN202737741U (en) | DC-DC booster circuit | |
| CN202738189U (en) | LED (Light Emitting Diode) driver and DC/DC (Direct Current to Direct Current) boost converter | |
| CN107086772B (en) | Boost circuit | |
| CN110048607A (en) | A kind of conversion circuit and implementation method of seamless switching boosting and straight-through operating mode | |
| WO2022242037A1 (en) | Power supply circuit, power supply system and smart door lock |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20130213 Effective date of abandoning: 20151014 |
|
| C25 | Abandonment of patent right or utility model to avoid double patenting |