CN202798447U - Power supply control device and switch power supply including same - Google Patents
Power supply control device and switch power supply including same Download PDFInfo
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- CN202798447U CN202798447U CN 201220528170 CN201220528170U CN202798447U CN 202798447 U CN202798447 U CN 202798447U CN 201220528170 CN201220528170 CN 201220528170 CN 201220528170 U CN201220528170 U CN 201220528170U CN 202798447 U CN202798447 U CN 202798447U
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Abstract
The utility model discloses a power supply control device and a switch power supply including the same. The power supply control device include a start unit, a control unit, an amplifier unit, a timer unit having the timing on-off function, a power supply terminal, a reverse input terminal, and an output driving terminal. When a third signal input by the amplifier unit is higher than a first reference voltage, and a fourth signal output by the amplifier unit controls a fifth signal output by the timer unit to be a pulse signal. A sixth signal is triggered within the active level time of the pulse signal, and a first signal input on the power supply terminal is controlled within the triggering time of the sixth signal. The voltage of the first signal is maintained above the switching-off voltage of the power supply control device when the power supply control device is in the zero load state, so the power supply control device is maintained in the working state and is not switched off, and the switch power supply can work stably in the zero load state.
Description
Technical field
The utility model relates to the switch power technology field, particularly relates to a kind of power control and comprises the Switching Power Supply of this power control.
Background technology
Switching Power Supply is a kind of device that an AC-input voltage is converted to a direct current output voltage, and it is little to have a volume, and therefore the advantage that efficient height and electric current are large is widely used in the occasions such as charger for mobile phone and notebook adapter.
In all types of Switching Power Supplies, because the operating voltage of inverse-excitation type switch power-supply, so inverse-excitation type switch power-supply is the most general so mainly is illustrated with inverse-excitation type switch power-supply in the utility model more near the voltage of daily use.Fig. 1 is the structure chart of inverse-excitation type switch power-supply in the prior art.Inverse-excitation type switch power-supply of the prior art comprises conversion equipment 110 and power control 120, wherein conversion equipment 110 comprises a voltage transformation unit 111 and a feedback unit 112, and described voltage transformation unit 111 comprises the first resistance R 1, the first capacitor C 1, diode D2, transformer T1, output rectifying tube D1, the second capacitor C 2, switching tube S1; Described feedback unit 112 comprises the second resistance R 2, the 3rd resistance R 3, the 4th resistance R 4, the first amplifier AMP1, photoelectrical coupler U4, the 5th resistance R 5 and the 6th resistance R 6; Described power control 120 comprises start unit 121, control unit 122, amplifier unit 123, power supply side VCC, reverse input end INV and output drive end GD.
Fig. 2 is the waveform schematic diagram of inverse-excitation type switch power-supply under Light Condition in the prior art.As shown in Figure 2, when to inverse-excitation type switch power-supply incoming transport input voltage VIN, described inverse-excitation type switch power-supply is started working, and the first signal V1 that voltage transformation unit 111 outputs to the power supply side VCC of described power control 120 begins to rise.When first signal V1 was higher than the cut-in voltage VCCON that equals described power control 120, described power control 120 was started working, and the secondary signal V2 of described start unit 121 outputs is high level, described control unit 122 normal operations.And described inverse-excitation type switch power-supply when starting working VD VOUT be zero, be lower than the second reference voltage VR2 that the first amplifier AMP1 sets in the described feedback unit 112, then described feedback unit 112 outputs to the first reference voltage VR1 that the 3rd signal V3 of the reverse input end INV of described power control 120 also just is lower than, the 4th signal V4 of described amplifier unit 123 outputs is high level, the 6th signal V6 of described control unit 122 outputs also is high level, switching tube S1 opens, first signal V1 rises, so first signal V1 maintains more than the shutoff voltage VCCOFF of described power control 120, described power control 120 normal operations.
And described inverse-excitation type switch power-supply is when unloaded operation, output does not need energy, when VD VOUT can surpass the second reference voltage VR2 that the first amplifier AMP1 sets in the described feedback unit 112, and through behind the rising response time THIGH of described feedback unit 112, the 3rd signal V3 will be higher than the first reference voltage VR1, then the 4th signal V4 of described amplifier unit 123 outputs becomes low level, the 6th signal V6 of described control unit 122 outputs also is low level, switching tube S1 turn-offs, VD VOUT begins to descend, and first signal V1 also begins to descend simultaneously.
Because 112 of described feedback units consume a small amount of energy, so it is very slow that VD VOUT descends, just can drop to the second reference voltage VR2 that the first amplifier AMP1 sets in the described feedback unit 112 through long TFALL fall time, and the decline response time TLOW that also has afterwards described feedback unit 112, so the 3rd signal V3 in a long time (TFALL adds TLOW) is higher than the first reference voltage VR1, then switching tube S1 during this period of time turn-offs always, and VD VOUT and first signal V1 descend always.And described power control 120 consumption are larger, so first signal V1 suppression ratio is very fast.
When first signal V1 drops to the shutoff voltage VCCOFF of described power control 120, the secondary signal V2 of described start unit 121 outputs becomes low level, described control unit 122 is turned off, does not work, and described inverse-excitation type switch power-supply also is turned off, does not work.And this moment AC-input voltage VIN by the power supply side VCC power supply to described power control 120 of the first resistance R 1 and the first capacitor C 1, first signal V1 begins to rise.
When first signal V1 rose to the cut-in voltage VCCON of described power control 120, the secondary signal V2 of described start unit 121 outputs was high level, and described power control 120 restarts work, and described inverse-excitation type switch power-supply also reopens.But wait until that always the decline response time TLOW that TFALL fall time that VD VOUT drops to the second reference voltage VR2 that the first amplifier AMP1 in the described feedback unit 112 sets adds the above feedback unit 112 finishes, the 3rd signal V3 just can be lower than the first reference voltage VR1 of described amplifier unit 123, the 4th signal V4 of described amplifier unit 123 outputs becomes high level, this moment, the 5th signal V5 of described timer units 124 outputs was high level, the 6th signal V6 of described control unit 122 outputs also is high level, switch S 1 is opened, first signal V1 continues to rise, and VD VOUT also begins to rise.Through behind the rise time TRISE, VD VOUT can surpass the second reference voltage VR2 that the first amplifier AMP1 sets in the described feedback unit 112 again, after then passing through the rising response time THIGH of described feedback unit 112, the 3rd signal V3 will be higher than the first reference voltage VR1, the 4th signal V4 of described amplifier unit 123 outputs is low level, the 6th signal V6 of described control unit 122 outputs also is low level, switching tube S1 turn-offs, VD VOUT begins to descend, first signal V1 also begins to descend simultaneously, and repeats said process.
In said process, when first signal V1 drops to the shutoff voltage VCCOFF of described power control 120, described power control 120 turn-offs, does not work, described inverse-excitation type switch power-supply also turn-offs, does not work, and when first signal V1 rises to the cut-in voltage VCCOFF of described power control 120, described power control 120 restarts work, and described inverse-excitation type switch power-supply also restarts.Described like this power control 120 and described inverse-excitation type switch power-supply can constantly turn-off and restart job insecurity.
Have at present several different methods to solve described inverse-excitation type switch power-supply job insecurity problem under Light Condition: the first is by reducing the power consumption of power control, make the Power supply voltage power down of power control slack-off, can not make Power supply voltage be reduced to the shutoff voltage of power control, power control just can not be turned off, not need to restart like this, but the power consumption of power control can not be fallen too lowly, otherwise described inverse-excitation type switch power-supply just can't start; The second is the Power supply voltage that improves power control, thereby prolong the Power supply voltage drop to the shutoff voltage time before of power control, can not make Power supply voltage be reduced to the shutoff voltage of power control, power control just can not be turned off, not need to restart like this, but can cause like this startup of described inverse-excitation type switch power-supply slack-off; The third is by adding dummy load in VD, the energy of output filter capacitor is consumed, so that exporting electric 32 drops, direct current accelerates, reduce the fall time of VD, thereby so that the Power supply voltage of power control can not be reduced to the shutoff voltage of power control, power control just can not be turned off, not need to restart like this, but this can cause the decrease in efficiency of described inverse-excitation type switch power-supply.
Because above several solutions defectiveness all, and defects do not exist only in inverse-excitation type switch power-supply, and also there is same problem in the Switching Power Supply of other topological structures under Light Condition.Therefore, how a kind of power control is provided and comprises the Switching Power Supply of this power control, Switching Power Supply can stably be worked under Light Condition, become the problem that those skilled in the art need to solve.
The utility model content
The purpose of this utility model is, a kind of power control is provided and comprises the Switching Power Supply of this power control, and Switching Power Supply can stably be worked under Light Condition.
For solving the problems of the technologies described above, the utility model provides a kind of power control, comprise: a start unit, a control unit, an amplifier unit, have timer units, power supply side, reverse input end and the output drive end of timed switching function;
Described start unit has the cut-in voltage of the described power control of setting and the shutoff voltage of described power control, the supply power voltage that described start unit is inputted described power control by described power supply side is first signal, and described start unit produces secondary signal and offers described control unit;
The feedback signal that one end of described amplifier unit is inputted described power control by described reverse input end is the 3rd signal, and the other end of described amplifier unit is inputted the first reference voltage, and described amplifier unit is exported the 4th signal;
Described timer units receives the 4th signal of described amplifier unit output, and produces the 5th signal;
Described control unit receives described secondary signal and described the 5th signal, and after producing the 6th signal, by described output drive end output.
Further, described timer units comprises an oscillating unit and a counting unit, and described oscillating unit produces an oscillator signal, and described counting unit receives described oscillator signal and described the 4th signal, and produces described the 5th signal.
Further, described oscillating unit is oscillator, and be 20us～100us the cycle of oscillation of described oscillator, and duty ratio is 30%～70%.
Further, described counting unit is up counter or subtract counter.
Further, described control unit has the pulse-width modulation function.
Further, the utility model also provides a kind of Switching Power Supply, comprising: a conversion equipment and a power control;
Conversion equipment comprises a voltage transformation unit and a feedback unit, and described voltage transformation unit receives the output of the output drive end of AC-input voltage and described power control, and produces first signal and VD; Described feedback unit receives VD, and produces the 3rd signal;
Power control comprises: a start unit, a control unit, an amplifier unit, have timer units, power supply side, reverse input end and the output drive end of timed switching function;
Described start unit has the cut-in voltage of the described power control of setting and the shutoff voltage of described power control, the supply power voltage that described start unit is inputted described power control by described power supply side is first signal, and described start unit produces secondary signal and offers described control unit;
The feedback signal that one end of described amplifier unit is inputted described power control by described reverse input end is the 3rd signal, and the other end of described amplifier unit is inputted the first reference voltage, and described amplifier unit is exported the 4th signal;
Described timer units receives the 4th signal of described amplifier unit output, and produces the 5th signal;
Described control unit receives described secondary signal and described the 5th signal, and after producing the 6th signal, by described output drive end output.
Further, described timer units comprises an oscillating unit and a counting unit, and described oscillating unit produces an oscillator signal, and described counting unit receives described oscillator signal and described the 4th signal, and produces described the 5th signal.
Further, described oscillating unit is oscillator, and be 20us～100us the cycle of oscillation of described oscillator, and duty ratio is 30%～70%.
Further, described counting unit is up counter or subtract counter.
Further, described control unit has the pulse-width modulation function.
Compared with prior art, the power control that provides of the utility model and the Switching Power Supply that comprises this power control have the following advantages:
1, the power control that the utility model provides, this power control comprises the timer units with timed switching function, when described the 3rd signal is higher than described the first reference voltage, the 5th signal of the described timer units output of the 4th signal controlling of described amplifier unit output is pulse signal, at described the 6th signal of the significant level time internal trigger of described pulse signal, and during described the 6th signal triggers, control the first signal of described power supply side input, so that the voltage of described first signal maintains more than the shutoff voltage of described power control when described power control is Light Condition, do not turn-off thereby make described power control remain on operating state.Avoided like this shutoff of described power control and restarted, so that described Switching Power Supply can stably be worked under Light Condition.
2, the power control that provides of the utility model, described timer units comprises an oscillating unit and a counting unit, described oscillating unit produces an oscillator signal, described counting unit receives described oscillator signal and described the 4th signal, and producing described the 5th signal, this control method is simple, effective.
Description of drawings
Fig. 1 is the structure chart of inverse-excitation type switch power-supply in the prior art;
Fig. 2 is the waveform schematic diagram of inverse-excitation type switch power-supply under Light Condition in the prior art;
Fig. 3 is the structure diagram of inverse-excitation type switch power-supply among the utility model one embodiment;
Fig. 4 is the schematic diagram of the timer units of inverse-excitation type switch power-supply among the utility model one embodiment;
Fig. 5 is the structure chart of inverse-excitation type switch power-supply among the utility model one embodiment;
Fig. 6 is the flow chart of the application process of power control among the utility model one embodiment;
Fig. 7 is the waveform schematic diagram of inverse-excitation type switch power-supply under Light Condition among the utility model one embodiment;
Fig. 8 is the structure chart of boost mode Switching Power Supply among another embodiment of the utility model.
Embodiment
Below in conjunction with schematic diagram power control of the present utility model and the Switching Power Supply that comprises this power control are described in more detail, wherein represented preferred embodiment of the present utility model, should be appreciated that those skilled in the art can revise the utility model described here, and still realize advantageous effects of the present utility model.Therefore, following description is appreciated that extensively knowing for those skilled in the art, and not as to restriction of the present utility model.
For clear, whole features of practical embodiments are not described.In the following description, be not described in detail known function and structure, the confusion because they can make the utility model owing to unnecessary details.Will be understood that in the exploitation of any practical embodiments, must make a large amount of implementation details to realize developer's specific objective, for example according to relevant system or relevant commercial restriction, change into another embodiment by an embodiment.In addition, will be understood that this development may be complicated and time-consuming, but only be routine work to those skilled in the art.
In the following passage, with way of example the utility model is described more specifically with reference to accompanying drawing.According to the following describes and claims, advantage of the present utility model and feature will be clearer.It should be noted that accompanying drawing all adopts very the form of simplifying and all uses non-accurately ratio, only in order to convenient, the purpose of aid illustration the utility model embodiment lucidly.
Core concept of the present utility model is, a kind of power control is provided, this power control comprises a start unit, and a control unit, an amplifier unit, have timer units, power supply side, reverse input end and the output drive end of timed switching function.
Further, in conjunction with above-mentioned power control, the utility model also provides a kind of Switching Power Supply, comprises a conversion equipment and described power control.
Below take inverse-excitation type switch power-supply as example, specify core concept of the present utility model, please refer to Fig. 3, it is the structure diagram of inverse-excitation type switch power-supply among the utility model one embodiment, in Fig. 3, identical reference number represents to be equal to label among Fig. 1.
Inverse-excitation type switch power-supply of the present utility model comprises conversion equipment 110 and power control 120.
Described start unit 121 receives first signal V1 by described power supply side VCC, and produces secondary signal V2, with unlatching and the shutoff of controlling described power control 120.The start unit 121 of described power control 120 has cut-in voltage VCCON and the shutoff voltage VCCOFF of power control.In the described power control 120 of Fig. 3, when first signal V1 is higher than the cut-in voltage VCCON that equals described power control 120, secondary signal V2 is high level, as long as first signal V1 is not less than the shutoff voltage VCCOFF of described power control 120, then secondary signal V2 is high level just always afterwards; When first signal V1 was lower than the shutoff voltage VCCOFF of described power control 120, secondary signal V2 was low level; After first signal V1 rises to the cut-in voltage VCCON of described power control 120 by the shutoff voltage VCCOFF of described power control 120, secondary signal V2 is high level by low transition, and the utility model is intended to control the shutoff voltage VCCOFF that first signal V1 is not less than described power control 120.
Described amplifier unit 123 receives the 3rd signal V3 by the reverse input end INV of described power control 120, described amplifier unit 123 also receives the first reference voltage VR1 simultaneously, and described amplifier unit 123 produces the 4th signal V4 after relatively the size of the 3rd signal V3 and the first reference voltage VR1 is also amplified.When the 3rd signal V3 was higher than the first reference voltage VR1, the 4th signal V4 was low level; When the 3rd signal V3 was lower than the first reference voltage VR1, the 4th signal V4 was high level.
Described timer units 124 receives the 4th signal V4, and produces the 5th signal V5.The 5th signal V5 that the 4th signal V4 of described amplifier unit 123 outputs controls described timer units 124 outputs is pulse signal, at described the 6th signal V6 of the significant level time internal trigger of described pulse signal.In the present embodiment, when described timer units 124 was high level at the 4th signal V4, controlling the 5th signal V5 was high level; When the 4th signal V4 was low level, controlling the 5th signal V5 was the cycle square wave.Better, described timer units 124 comprises an oscillating unit 501 and a counting unit 502, described oscillating unit 501 produces an oscillator signal V7, described counting unit 502 receives oscillator signal V7 and the 4th signal V4, and according to the 4th signal V4 oscillator signal V7 is counted and produces the 5th signal V5, as shown in Figure 4.Better, when the 4th signal V4 is low level, the 5th signal V5 is the cycle square wave that high-low level forms, the 5th signal V5 produces the 6th signal of described control unit 122 outputs is opened switching tube S1, thereby first signal V1 is risen, and then so that the first signal V1 that described power supply side VCC receives maintain more than the shutoff voltage VCCOFF of described power control 120 during for Light Condition at described power control 120, secondary signal V2 is high level always, then described power control 120 can stably be worked always, can not turn-off and restart.
Described oscillating unit 501 is oscillator, be 20us～100us the cycle of oscillation of described oscillator, preferred 30us, 50us, 80us, duty ratio is 30%～70%, preferred 40%, 50%, 60%, described counting unit 502 is up counter or subtract counter, so that oscillator signal V7 is counted.In the present embodiment, described timer units 124 is not limited to an oscillating unit 501 and a counting unit 502, as being trigger, as long as can produce the unit of the 5th signal V5 that meets the demands, also within thought range of the present utility model.
The 5th signal V5 is not limited to the cycle square wave, as being triangular wave or half-wave isopulse signal, as long as first signal V1 that described power supply side VCC receives is maintained more than the shutoff voltage VCCOFF of described power control 120 during for Light Condition, also within thought range of the present utility model at described power control 120.
Described control unit 122 receives secondary signal V2 and the 5th signal V5, and produces the 6th signal V6.Whether secondary signal V2 is used for controlling described control unit 122 and works.When secondary signal V2 is high level, described control unit 122 normal operations, then the 5th signal V5 controls the 6th signal V6; When secondary signal V2 was low level, described control unit 122 was not worked, and then the 5th signal V5 does not control the 6th signal V6, and the 6th signal V6 is low level.The 6th signal V6 outputs to described conversion equipment 110 by the output drive end GD of described power control 120.Better, described control unit 122 is one to have the circuit of pulse-width modulation function, and pulse-width modulation can effectively utilize the energy of power supply, so that the efficient of circuit is high.
Fig. 5 is the structure chart of inverse-excitation type switch power-supply among the utility model one embodiment, inverse-excitation type switch power-supply in the present embodiment comprises conversion equipment 110 and power control 120, wherein conversion equipment 110 comprises a voltage transformation unit 111 and a feedback unit 112, described voltage transformation unit 111 receives the output of the output drive end GD of AC-input voltage VIN and described power control 120, and produces first signal V1 and VD VOUT; Described feedback unit 112 receives VD VOUT, and produces the 3rd signal V3; Wherein, first signal V1 is as the supply power voltage of described power control 120, and the 3rd signal V3 is as the feedback signal of described power control 120.
Described voltage transformation unit 111 comprises the first resistance R 1, the first capacitor C 1, diode D2, transformer T1, output rectifying tube D1, the second capacitor C 2, switching tube S1.One end of a termination the first resistance R 1 of alternating current input power supplying VIN also links to each other with the first pin 1 of transformer T1, one end and the ground connection of another termination the first capacitor C 1 of alternating current input power supplying VIN, the other end of another termination the first capacitor C 1 of the first resistance R 1 also links to each other with the power supply side VCC of described power control 120, the crus secunda 2 of transformer T1 connects first utmost point of switching tube S1, the tripod 3 of transformer T1 connects the anode of output rectifying tube D1, the 4th pin 4 ground connection of transformer T1, the negative electrode of output rectifying tube D1 connects an end of the second capacitor C 2, the other end ground connection of the second capacitor C 2, two termination dc output power VOUT of the second capacitor C 2, second utmost point of switching tube S1 meets the output drive end GD of described power control 120, the 3rd utmost point ground connection of switching tube S1, the 5th pin 5 of transformer T1 connects the anode of diode D2, the negative electrode of diode D2 meets the power supply side VCC of described power control 120, the 6th pin 6 ground connection of transformer T1, be former limit winding L 1 between the first pin 1 of transformer T1 and the crus secunda 2, be secondary winding L 2 between the tripod 3 of transformer T1 and the 4th pin 4, be auxiliary winding L 3 between the 5th pin 5 of transformer T1 and the 6th pin 6, the first pin 1 of transformer T1 is the Same Name of Ends of former limit winding L 1, the 4th pin 4 of transformer T1 is the Same Name of Ends of secondary winding L 2, and the 6th pin 6 of transformer T1 is the Same Name of Ends of auxiliary winding L 3.
In the present embodiment, the 6th signal V6 that control unit 122 produces sends second utmost point of switching tube S1, opening or turn-offing with control switch pipe S1 to by exporting drive end GD.When the 6th signal V6 was high level, switching tube S1 opened; When the 6th signal V6 was low level, switching tube S1 turn-offed.When switching tube S1 opened, VD VOUT rose, and first signal V1 also rises; When switching tube S1 turn-offed, VD VOUT descended, and first signal V1 also descends.
Described feedback unit 112 comprises the second resistance R 2, the 3rd resistance R 3, the 4th resistance R 4, the first amplifier AMP1, photoelectrical coupler U4, the 5th resistance R 5 and the 6th resistance R 6.One end of described the second resistance R 2 links to each other with described VD VOUT, the other end of described the second resistance R 2 links to each other with the first input end of described the first amplifier AMP1, the first input end of described the first amplifier AMP1 is by described the 4th resistance R 4 ground connection, the second input termination the second reference voltage VR2 of described the first amplifier AMP1, one end of described the 3rd resistance R 3 links to each other with described VD VOUT, the first pin 1 of the described photoelectrical coupler U4 of another termination of described the 3rd resistance R 3, the crus secunda 2 of the described photoelectrical coupler U4 of output termination of described the first amplifier AMP1, the tripod 3 of described photoelectrical coupler U4 meets the power supply side VCC of described power control 120, the 4th pin 4 of described photoelectrical coupler U4 is by described the 5th resistance R 5 ground connection, and meets the reverse input end INV of described power control by described the 6th resistance R 6.
In the present embodiment, described feedback unit 112 is that VD VOUT is converted to the 3rd signal V3, outputs to the reverse input end INV of described power control 120.When described VD VOUT was higher than the second reference voltage VR2, described the 3rd signal V3 was higher than the first reference voltage VR1; When described VD VOUT was lower than the second reference voltage VR2, described the 3rd signal V3 was lower than the first reference voltage VR1.For the loop stability of inverse-excitation type switch power-supply, VD VOUT has certain response time when being converted to the 3rd signal V3.
In the present embodiment, described conversion equipment 110 is not limited to said structure, the second capacitor C 2 of voltage transformation unit 111 also can one the 3rd capacitor C 3 in parallel as described, or the first pin 1 of the photoelectrical coupler U4 of described feedback unit 112 can also pass through one the 4th capacitor C, 4 ground connection, want again to realize function of the present utility model, also within thought range of the present utility model.
Specify the application process of power control in the present embodiment below in conjunction with Fig. 6 and Fig. 7.Wherein, Fig. 6 is the flow chart of the application process of power control among the utility model one embodiment; Fig. 7 is the waveform schematic diagram of inverse-excitation type switch power-supply under Light Condition among the utility model one embodiment.
At first, carry out step S11, when the 3rd signal was lower than the first reference voltage, it was high level that described timer units is controlled the 5th signal.
When to inverse-excitation type switch power-supply incoming transport input voltage VIN, described inverse-excitation type switch power-supply is started working.AC-input voltage VIN is by the first resistance R 1 and the first capacitor C 1 power supply side VCC output first signal V1 to described power control 120, and first signal V1 begins to rise.When first signal V1 was higher than the cut-in voltage VCCON that equals described power control 120, described power control 120 was started working, and the secondary signal V2 of described start unit 121 outputs is high level, described control unit 122 normal operations.And described inverse-excitation type switch power-supply when starting working described VD VOUT be zero, be lower than the second reference voltage VR2 that the first amplifier AMP1 sets in the described feedback unit 112, then described feedback unit 112 the 3rd signal V3 that outputs to the reverse input end INV of described power control 120 also just is lower than the first reference voltage VR1, the 4th signal V4 of described amplifier unit 123 outputs is high level, this moment, the 5th signal V5 of described timer units 124 outputs was high level, the 6th signal V6 of described control unit 122 outputs also is high level, then switching tube S1 opens, alternating current input power supplying VIN transfers to the second capacitor C 2 by the former limit of transformer T1 winding L 1 and the secondary winding L 2 of described voltage transformation unit 111 with energy, then VD VOUT begins to rise, and through rise time TRISE, reach the second reference voltage VR2 that the first amplifier AMP1 sets in the described feedback unit 112, simultaneously, because switching tube S1 opens, the different name terminal voltage of auxiliary winding L 3 also is lower than Same Name of Ends voltage, diode D2 is anti-inclined to one side, alternating current input power supplying VIN powers to the power supply side VCC continuation of described power control 120 by the first resistance R 1 and the first capacitor C 1, first signal V1 continues to rise, first signal V1 maintains more than the shutoff voltage VCCOFF of described power control 120, described power control 120 normal operations.
Then, carry out step S12, when the 3rd signal was higher than the first reference voltage, it was pulse signal that described timer units is controlled the 5th signal.
When described inverse-excitation type switch power-supply during in unloaded operation, because output does not need energy, then VD VOUT can surpass the second reference voltage VR2 that the first amplifier AMP1 sets in the described feedback unit 112, and through behind the rising response time THIGH of described feedback unit 112, the 3rd signal V3 will be higher than the first reference voltage VR1, then the 4th signal V4 of described amplifier unit 123 outputs is low level, described timer units 124 controls the 5th signal V5 is that low-level pulse width is TOFF, the high level pulsewidth is the cycle square wave of TON, described control unit 122 controls the 6th signal V6 is TOFF for low-level pulse width also, the high level pulsewidth is the cycle square wave of TON, and then described power control 120 carries out the timing switch process by output drive end GD to switching tube S1.
In the present embodiment, described timer units 124 comprises an oscillating unit 501 and a counting unit 502, described oscillating unit 501 produces an oscillator signal V7, described counting unit 502 receives oscillator signal V7 and the 4th signal V4, count the cycle of oscillation to oscillator signal V7, in the time of N cycle of oscillation, the 5th signal V5 of described counting unit 502 outputs is low level always at counting, and the time of this section N cycle of oscillation is counts turn-off time TOFF.
In the 5th signal V5 is low level counting turn-off time TOFF, the 6th signal V6 of described control unit 122 outputs also is low level, switching tube S1 turn-offs, the electric current of the magnetizing inductance of transformer T1 is so that auxiliary winding L 3 voltage reversal assist winding L 3 to the power supply side VCC power supply of described power control 120.But do not have energy supplement because switching tube S1 closes the transformer T1 that has no progeny, so along with the energy of the second capacitor C 2 is progressively consumed by described feedback unit 112, VD VOUT begins to descend; Simultaneously, along with energy in the auxiliary winding L 3 is progressively consumed by described power control 120, first signal V1 also begins to descend.Because the second capacitor C 2 is larger, and the energy of the second capacitor C 2 is only had a small amount of consumption by described feedback unit 112, so it is very slow that VD VOUT descends, just can drop to the second reference voltage VR2 that the first amplifier AMP1 sets in the described feedback unit 112 through long TFALL fall time, and the decline response time TLOW that also has afterwards described feedback unit 112, so the 3rd signal V3 in a long time (TFALL adds TLOW) is higher than the first reference voltage VR1, the 4th signal V4 of described amplifier unit 123 outputs during this period of time is low level, and then the 5th signal V5 of described timer units 124 outputs during this period of time is the cycle square wave.And energy is less in the auxiliary winding L 3, and larger by described power control 120 consumption, so first signal V1 suppression ratio is very fast.
After the counting time end of N cycle of oscillation, first signal V1 does not also drop to the shutoff voltage VCCOFF of described power control 120, this moment, described counting unit 502 was counted the time of M cycle of oscillation again, within the time of counting M cycle of oscillation, the 5th signal V5 of described counting unit 502 outputs be high level always, and the time of this section M cycle of oscillation is counts opening time TON.
In the 5th signal V5 is the counting opening time TON of high level, the 6th signal V6 of described control unit 122 outputs also is high level, then switching tube S1 reopens, to transformer T1 makeup energy, VD VOUT begins to rise AC-input voltage VIN by former limit winding L 1 and switching tube S1; Simultaneously, the different name terminal voltage of auxiliary winding L 3 also is lower than Same Name of Ends voltage, and diode D2 is anti-inclined to one side, and alternating current input power supplying VIN is by the power supply side VCC power supply to described power control 120 of the first resistance R 1 and the first capacitor C 1, and first signal V1 begins to rise.
The 5th signal V5 of timer units 124 outputs described above is low level counting turn-off time TOFF, with the 5th signal V5 be the counting opening time TON of high level, consist of one-period, but it is unfixing for what specifically to count opening time TON and counting turn-off time TOFF, actual will be according to the TFALL and the decline response time TLOW of described feedback unit 112 fall time of VD VOUT, and the shutoff voltage VCCOFF of described power control 120 determines, guarantees that namely the shutoff voltage VCCOFF that is not less than described power control 120 at first signal V1 gets final product.
Then, in the next cycle of the 5th signal V5 square wave that described timer units 124 is exported, repeat said process.Described like this timer units 124 is periodically opened switching tube S1 or turn-off, so that first signal V1 maintains certain magnitude of voltage, and can not drop to the shutoff voltage VCCOFF of described power control 120, the secondary signal V2 that is described start unit 121 outputs is high level always, described power control 120 is in the state of normal operation and timing switch always, and this state is continued until that the 3rd signal V3 finishes when being lower than the first reference voltage VR1.Described like this power control 120 just can not be turned off, not need to restart, so that described inverse-excitation type switch power-supply can stably be worked under Light Condition.
When the decline response time TLOW that TFALL fall time that drops to the second reference voltage VR2 of described feedback unit 112 as VD VOUT adds the above feedback unit 112 finishes, the 3rd signal V3 is lower than the second reference voltage VR2, the 4th signal V4 of described amplifier unit 123 outputs is high level, then the 5th signal V5 of described timer units 124 outputs is high level, the 6th signal V6 of described control unit 122 also is high level, switching tube S1 is opened, VD VOUT begins to rise, through behind the rise time TRISE, reach even can surpass again the second reference voltage VR2 of the first amplifier AMP1 setting in the described feedback unit 112, after then passing through the rising response time THIGH of described feedback unit 112, the 3rd signal V3 will be higher than the first reference voltage VR1, the 4th signal V4 of described amplifier unit 123 is low level, it is the cycle square wave that described timer units 124 is controlled again the 5th signal V5, and then described power control 120 repeats above-mentioned timing switch process.
Therefore, in step S11 and step S12, first signal V1 maintains more than the shutoff voltage VCCOFF of described power control 120 always, secondary signal V2 is high level always, so when step S11 and the work of step S12 alternate cycles, described energy supply control module 120 can stably be worked always.
The inverse-excitation type switch power-supply that the utility model provides can be used for LED and drives and other application scenarios.
Have the power control 120 of timed switching function in the utility model except being used for inverse-excitation type switch power-supply, can also be used for the Switching Power Supply of other topological structures, such as the Switching Power Supply of boost mode, as shown in Figure 8.In Fig. 8, identical reference number represents to be equal to label among Fig. 5, and the Switching Power Supply of boost mode comprises conversion equipment 110 and power control 120, and wherein conversion equipment 110 comprises that one has voltage transformation unit 211 and a feedback unit 112 of boost function.But power control 120 of the present utility model is not limited to the Switching Power Supply of inverse-excitation type switch power-supply and boost mode, as long as being arranged, power factor adjusts function or long Switching Power Supply of loop response time, can use described energy supply control module 120, to reach the beneficial effect of steady operation.
In sum, the utility model provides a kind of power control compared with prior art, the utlity model has following advantage:
1, the power control that the utility model provides, this power control comprises the timer units with timed switching function, when described the 3rd signal is higher than described the first reference voltage, the 5th signal of the described timer units output of the 4th signal controlling of described amplifier unit output is pulse signal, at described the 6th signal of the significant level time internal trigger of described pulse signal, and during described the 6th signal triggers, control the first signal of described power supply side input, so that the voltage of described first signal maintains more than the shutoff voltage of described power control when described power control is Light Condition, do not turn-off thereby make described power control remain on operating state.Avoided like this shutoff of described power control and restarted, so that described Switching Power Supply can stably be worked under Light Condition.
2, the power control that provides of the utility model, described timer units comprises an oscillating unit and a counting unit, described oscillating unit produces an oscillator signal, described counting unit receives described oscillator signal and described the 4th signal, and producing described the 5th signal, this control method is simple, effective.
Obviously, those skilled in the art can carry out various changes and modification to the utility model and not break away from spirit and scope of the present utility model.Like this, if of the present utility model these are revised and modification belongs within the scope of the utility model claim and equivalent technologies thereof, then the utility model also is intended to comprise these changes and modification interior.
Claims (10)
1. power control comprises: a start unit, a control unit, an amplifier unit, have timer units, power supply side, reverse input end and the output drive end of timed switching function;
Described start unit has the cut-in voltage of the described power control of setting and the shutoff voltage of described power control, the supply power voltage that described start unit is inputted described power control by described power supply side is first signal, and described start unit produces secondary signal and offers described control unit;
The feedback signal that one end of described amplifier unit is inputted described power control by described reverse input end is the 3rd signal, and the other end of described amplifier unit is inputted the first reference voltage, and described amplifier unit is exported the 4th signal;
Described timer units receives the 4th signal of described amplifier unit output, and produces the 5th signal;
Described control unit receives described secondary signal and described the 5th signal, and after producing the 6th signal, by described output drive end output.
2. power control as claimed in claim 1, it is characterized in that described timer units comprises an oscillating unit and a counting unit, described oscillating unit produces an oscillator signal, described counting unit receives described oscillator signal and described the 4th signal, and produces described the 5th signal.
3. power control as claimed in claim 2 is characterized in that, described oscillating unit is oscillator, and be 20us～100us the cycle of oscillation of described oscillator, and duty ratio is 30%～70%.
4. power control as claimed in claim 2 is characterized in that, described counting unit is up counter or subtract counter.
5. such as the described power control of any one among the claim 1-4, it is characterized in that described control unit has the pulse-width modulation function.
6. a Switching Power Supply comprises: a conversion equipment and a power control;
Conversion equipment comprises a voltage transformation unit and a feedback unit, and described voltage transformation unit receives the output of the output drive end of AC-input voltage and described power control, and produces first signal and VD; Described feedback unit receives VD, and produces the 3rd signal;
Power control comprises: a start unit, a control unit, an amplifier unit, have timer units, power supply side, reverse input end and the output drive end of timed switching function;
Described start unit has the cut-in voltage of the described power control of setting and the shutoff voltage of described power control, the supply power voltage that described start unit is inputted described power control by described power supply side is first signal, and described start unit produces secondary signal and offers described control unit;
The feedback signal that one end of described amplifier unit is inputted described power control by described reverse input end is the 3rd signal, and the other end of described amplifier unit is inputted the first reference voltage, and described amplifier unit is exported the 4th signal;
Described timer units receives the 4th signal of described amplifier unit output, and produces the 5th signal;
Described control unit receives described secondary signal and described the 5th signal, and after producing the 6th signal, by described output drive end output.
7. Switching Power Supply as claimed in claim 6, it is characterized in that described timer units comprises an oscillating unit and a counting unit, described oscillating unit produces an oscillator signal, described counting unit receives described oscillator signal and described the 4th signal, and produces described the 5th signal.
8. Switching Power Supply as claimed in claim 7 is characterized in that, described oscillating unit is oscillator, and be 20us～100us the cycle of oscillation of described oscillator, and duty ratio is 30%～70%.
9. Switching Power Supply as claimed in claim 7 is characterized in that, described counting unit is up counter or subtract counter.
10. such as the described Switching Power Supply of any one among the claim 6-9, it is characterized in that described control unit has the pulse-width modulation function.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220528170 CN202798447U (en) | 2012-10-15 | 2012-10-15 | Power supply control device and switch power supply including same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220528170 CN202798447U (en) | 2012-10-15 | 2012-10-15 | Power supply control device and switch power supply including same |
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| Publication Number | Publication Date |
|---|---|
| CN202798447U true CN202798447U (en) | 2013-03-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201220528170 Expired - Lifetime CN202798447U (en) | 2012-10-15 | 2012-10-15 | Power supply control device and switch power supply including same |
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| CN (1) | CN202798447U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112236942A (en) * | 2018-07-18 | 2021-01-15 | 深圳市汇顶科技股份有限公司 | Method and apparatus for digital quartz temperature and drift compensation of sleep timers for NB-IoT devices |
-
2012
- 2012-10-15 CN CN 201220528170 patent/CN202798447U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112236942A (en) * | 2018-07-18 | 2021-01-15 | 深圳市汇顶科技股份有限公司 | Method and apparatus for digital quartz temperature and drift compensation of sleep timers for NB-IoT devices |
| CN112236942B (en) * | 2018-07-18 | 2023-12-05 | 深圳市汇顶科技股份有限公司 | Method and apparatus for digital quartz temperature and drift compensation for sleep timers of NB-IoT devices |
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