CN101976946B - Circuit and method for transforming negative voltage between direct currents - Google Patents
Circuit and method for transforming negative voltage between direct currents Download PDFInfo
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- CN101976946B CN101976946B CN2010105299100A CN201010529910A CN101976946B CN 101976946 B CN101976946 B CN 101976946B CN 2010105299100 A CN2010105299100 A CN 2010105299100A CN 201010529910 A CN201010529910 A CN 201010529910A CN 101976946 B CN101976946 B CN 101976946B
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Abstract
The invention provides a circuit for transforming negative voltage between direct currents. The circuit comprises a direct current power supply, a power supply controller, an inductor, a first diode, a first capacitor, a load, a soft-start circuit and a voltage adjustment circuit, wherein one end of the load leads out a negative voltage output end, while the other end is a ground terminal; a positive electrode of the direct current power supply is connected with a reference ground, and a negative electrode is connected with the power supply controller; the power supply controller is connected with the negative voltage output end and the first diode; the inductor is connected with the first diode, the first capacitor, the voltage adjustment circuit and the negative voltage output end; the first diode is connected with the voltage adjustment circuit, the first capacitor and the ground terminal of the load; the first capacitor and the load are connected in parallel; the soft-start circuit is connected with the power supply controller, the negative electrode of the direct current power supply and the reference ground; and the voltage adjustment circuit is connected with the reference ground, the direct current power supply, the power supply controller, the negative voltage output end and the ground terminal of the load. The invention also provides a method for transforming the negative voltage between the direct currents. The circuit and the method have strong loading capacity and high efficiency.
Description
Technical field
The invention belongs to the translation circuit technical field, negative voltage translation circuit and method between particularly a kind of direct current (being DC-DC negative voltage translation circuit and method).
Background technology
Along with the high speed development of electronic technology, increasing electronic system need be used negative supply ability operate as normal, like operational amplifier, and modulator-demodulator, computer power supply etc.Meanwhile, in order to satisfy the developing direction of modern electro source technology, system also further improves for the requirement of negative supply, particularly aspect these two of the carrying load ability of negative supply and efficient.
Negative voltage translation circuit (being DC-DC negative voltage translation circuit) has following three kinds between direct current commonly used:
1, linear stabilized power supply
As shown in Figure 1, this negative voltage translation circuit comprises DC power supply 1, filter capacitor 2, filter capacitor 3, load 4 and negative voltage three terminal regulator 5, and the voltage magnitude of DC power supply 1 is higher than the amplitude of the negative voltage of actual output 46.Utilize negative voltage three terminal regulator 5,, can obtain the negative voltage of required output 46 as 7905 etc.This technology circuit is simple, but efficient is low, and power consumption is big, generally only is used for adopting the occasion of Switching Power Supply, as is used for disturbing responsive circuit.
2, charge pump
As shown in Figure 2; This negative voltage translation circuit comprises DC power supply 7, analog switch 8, analog switch 9, analog switch 11, analog switch 12, storage capacitor 10, storage capacitor 13, load 14, square-wave oscillator 6 and inverter 15, and the rectangular wave drive signal of square-wave oscillator 6 outputs is directly controlled opening and turn-offing of analog switch 8, analog switch 9.Simultaneously, this drive signal is also directly controlled analog switch 11 through inverter 15, the opening and turn-offing of analog switch 12.When square-wave oscillator 6 output high level, analog switch 8, analog switch 9 conductings, analog switch 11, analog switch 12 turn-off, and DC power supply 7 will charge to storage capacitor 10.When square-wave oscillator 6 output high level, analog switch 8, analog switch 9 turn-off, analog switch 11, analog switch 12 conductings, and storage capacitor 10 will charge and to load 14 power supplies to storage capacitor 13.Because the high potential ground connection of storage capacitor 13 just can obtain the negative voltage of output 47 this moment.This scheme biggest advantage is to adopt the electric capacity storage power, and outward element is few, can make the volume of power supply accomplish very little.But its output characteristic is poor, and carrying load ability is poor.
3, DC-DC voltage transformation (being voltage transformation between direct current)
As shown in Figure 3, this DC-DC voltage conversion circuit comprises DC power supply 16, switching tube 17, diode 18, inductance 19, electric capacity 20 and load 21, and its basic functional principle is: when switching tube 17 conductings, and inductance 19 storage power, 20 pairs of loads of electric capacity, 21 power supplies.When switching tube 17 turn-offed, inductance 19 was through 20 chargings of 18 pairs of electric capacity of diode, and the unidirectional on state characteristic of diode 18 makes that the output voltage relative reference ground of output 48 is negative.The shortcoming of sort circuit is in inductive energy storage, to charge to electric capacity, thus carrying load ability a little less than.
Summary of the invention
Primary and foremost purpose of the present invention is to overcome the shortcoming of above-mentioned prior art with not enough, provides a kind of simple and reasonable for structure, can effectively reduce the ripple of output voltage, increases negative voltage translation circuit between the direct current of its carrying load ability and efficient.
Another object of the present invention is to provide negative voltage transform method between the direct current of realizing by foregoing circuit.
For reaching above-mentioned purpose, the present invention adopts following technical scheme:
Negative voltage translation circuit between direct current; Comprise DC power supply, power-supply controller of electric, inductance, first diode, first electric capacity, load, soft starting circuit and voltage-regulating circuit; Said power-supply controller of electric comprises pliotron collector electrode output pin, reference ground pin, feedback input pin, soft start input pin and power pins; One end of said load is drawn the negative voltage output, and the other end is for connecting the earth terminal with reference to ground; The positive pole of said DC power supply connects with reference to ground, and its negative pole is connected with the reference ground pin of power-supply controller of electric; The power pins of said power-supply controller of electric is connected with the negative voltage output, and the pliotron collector electrode output pin of said power-supply controller of electric is connected with the anode of first diode; One end of said inductance is connected with the anode of first diode, and its other end is connected with an end and the negative voltage output of an end of first electric capacity, voltage-regulating circuit, said load respectively; The negative electrode of said first diode is connected with the other end of voltage-regulating circuit, first electric capacity and the earth terminal of load respectively; The two ends of first electric capacity are connected with the two ends of load respectively; Said soft starting circuit is connected with soft start input pin, the negative pole of DC power supply, the reference ground of power-supply controller of electric respectively; Said voltage-regulating circuit is connected with earth terminal with reference to the negative pole of ground, DC power supply, feedback input pin, negative voltage output, load respectively.
Said soft starting circuit comprises second electric capacity and the 6th resistance; The two ends of said second electric capacity are connected with the negative pole of DC power supply, the soft start input pin of power-supply controller of electric respectively; One end of said the 6th resistance connects with reference to ground, and the other end is connected with the soft start input pin of power-supply controller of electric.
Said voltage-regulating circuit comprises the 5th resistance, the 4th resistance, triode, three end parallel connection type voltage stabilizing didoes, first resistance and second resistance; The collector electrode of the negative pole of said DC power supply, the 5th resistance, the 4th resistance, triode connects successively, and the feedback input pin of said power-supply controller of electric is connected on the interface of the 5th resistance and the 4th resistance; The emitter of said triode is connected with reference ground, and its base stage is connected with the negative electrode of three end parallel connection type voltage stabilizing didoes, and the anode of said three end parallel connection type voltage stabilizing didoes is connected with an end of negative voltage output, inductance respectively; The reference utmost point of said three end parallel connection type voltage stabilizing didoes is connected with an end of second resistance, and the other end of second resistance is connected with the negative electrode of first diode, the earth terminal of load respectively; The two ends of said first resistance are connected with the reference utmost point, the anode of three end parallel connection type voltage stabilizing didoes respectively.
Said voltage-regulating circuit also comprises the 3rd resistance, and an end of said the 3rd resistance is connected with the base stage of triode, and the other end is connected with emitter, the reference ground of triode respectively.
Said first diode is a Schottky diode.
Said triode is the PNP triode.
By negative voltage transform method between the direct current of foregoing circuit, comprise the steps:
(1) soft start: before applying DC power supply, the voltage in the soft starting circuit on second electric capacity is zero, apply DC power supply after, the voltage on second electric capacity is that the voltage on the soft start input pin of power-supply controller of electric increases by zero gradually; When the voltage on second electric capacity is that voltage on the soft start input pin of power-supply controller of electric is during greater than the starting resistor of power-supply controller of electric inside; Then accomplished soft start-up process, the time of its soft start is confirmed by the size of the 6th resistance in the soft starting circuit and second electric capacity;
The charging of (2) first electric capacity: after the negative voltage translation circuit is accomplished soft start between said direct current; When the inner pliotron conducting of power-supply controller of electric; Form low impedance path between the pliotron collector electrode output pin of power-supply controller of electric and the reference ground pin, DC power supply is given inductance and the charging of first electric capacity; When the inner pliotron of power-supply controller of electric turn-offed, the electric current in the inductance changed by continuing through first diode to first electric capacity charging pliotron conducting once more that energy stored release finishes or power-supply controller of electric is inner in inductance; Realize that first electric capacity all obtains charging in inductance storage power and the process that releases energy, to have reduced the ripple of output voltage, increase the carrying load ability and the efficient of negative voltage translation circuit between said direct current;
(3) voltage adjustment:
(3-1) adjustment of boosting: after the negative voltage translation circuit is accomplished soft start between said direct current; In the voltage-regulating circuit; When the voltage magnitude of negative voltage output descends; Correspondingly be loaded into the reference utmost point of three end parallel connection type voltage stabilizing didoes through first resistance and second electric resistance partial pressure and the voltage between the anode also descends, if the reference utmost point and the voltage between the anode that are loaded into three end parallel connection type voltage stabilizing didoes through first resistance and second electric resistance partial pressure is less than the inner reference voltage of three end parallel connection type voltage stabilizing didoes, then the input current of the negative electrode of three end parallel connection type voltage stabilizing didoes descends; The electric current of transistor collector descends simultaneously; The voltage that is loaded into the feedback input pin of power-supply controller of electric through the 4th resistance and the 5th resistance also descends, and power-supply controller of electric correspondingly increases the ON time of internal power triode, to reduce its turn-off time; Thereby increase charging current and charging interval, improve the voltage of negative voltage output first electric capacity;
(3-2) step-down adjustment: after the negative voltage translation circuit is accomplished soft start between said direct current; In the voltage-regulating circuit; When the voltage magnitude of negative voltage output rises; Correspondingly be loaded into the reference utmost point of three end parallel connection type voltage stabilizing didoes through first resistance and second electric resistance partial pressure and the voltage between the anode also rises, if the reference utmost point and the voltage between the anode that are loaded into three end parallel connection type voltage stabilizing didoes through first resistance and second electric resistance partial pressure is greater than the inner reference voltage of three end parallel connection type voltage stabilizing didoes, then the input current of the negative electrode of three end parallel connection type voltage stabilizing didoes rises; The electric current of the collector electrode of triode rises simultaneously; The voltage that is loaded into the feedback input pin of power-supply controller of electric through the 4th resistance and the 5th resistance also rises, and power-supply controller of electric correspondingly reduces the ON time of internal power triode, to increase its turn-off time; Thereby reduce charging current and charging interval, reduce the voltage of negative voltage output first electric capacity.
In the said step (3), voltage-regulating circuit is when boosting adjustment or step-down adjustment, and the 3rd resistance is realized the leakage current bypass to three end parallel connection type voltage stabilizing didoes, prevents that the leakage current of three end parallel connection type voltage stabilizing didoes from producing adverse influence to feedback loop.
Compared with prior art, the present invention has following advantage and beneficial effect:
(1) negative voltage translation circuit between direct current according to the invention; Compare with negative voltage translation circuit between existing direct current; Can in inductive energy storage, charge, during the break-make of power-supply controller of electric internal power triode, all can export energy, thereby reduce the ripple of output voltage through inductance to electric capacity; Increase its carrying load ability and efficient, have stronger carrying load ability.
(2) the present invention is provided with voltage-regulating circuit, can be through the ON time of voltage-regulating circuit adjustment power-supply controller of electric internal power triode, thus the voltage of adjustment negative voltage output has efficient height, advantage such as flexible.
Description of drawings
Fig. 1 is first kind of structural representation of prior art circuits.
Fig. 2 is second kind of structural representation of prior art circuits.
Fig. 3 is the third structural representation of prior art circuits.
Fig. 4 is the structural representation of circuit of the present invention.
Embodiment
Below in conjunction with embodiment and accompanying drawing the present invention is described in further detail, but execution mode of the present invention is not limited thereto.
Embodiment
As shown in Figure 4; The negative voltage translation circuit comprises DC power supply 36, power-supply controller of electric 39, inductance 31, first diode 30, first electric capacity 29, load 28, soft starting circuit and voltage-regulating circuit between this direct current; Said power-supply controller of electric 39 comprises pliotron collector electrode output pin 40, reference ground pin 41, feedback input pin 42, soft start input pin 43 and power pins 44; One end of said load 28 is drawn negative voltage output 45, and the other end is for connecting the earth terminal with reference to ground; The positive pole of said DC power supply 36 connects with reference to ground, and its negative pole is connected with the reference ground pin 41 of power-supply controller of electric 39; The power pins 44 of said power-supply controller of electric 39 is connected with negative voltage output 45, and the pliotron collector electrode output pin 40 of said power-supply controller of electric 39 is connected with the anode of first diode 30; One end of said inductance 31 is connected with the anode of first diode 30, and its other end is connected with an end and the negative voltage output 45 of an end of first electric capacity 29, voltage-regulating circuit, said load 28 respectively; The negative electrode of said first diode 30 is connected with the other end of voltage-regulating circuit, first electric capacity 29 and the earth terminal of load 28 respectively; The two ends of first electric capacity 29 are connected with the two ends of load 28 respectively; Said soft starting circuit is connected with soft start input pin 43, the negative pole of DC power supply 36, the reference ground of power-supply controller of electric 39 respectively; Said voltage-regulating circuit is connected with earth terminal with reference to the negative pole of ground, DC power supply 36, feedback input pin 42, negative voltage output 45, load 28 respectively.
Said soft starting circuit comprises second electric capacity 37 and the 6th resistance 38; The two ends of said second electric capacity 37 are connected with the negative pole of DC power supply 36, the soft start input pin 43 of power-supply controller of electric 39 respectively; One end of said the 6th resistance 38 connects with reference to ground, and the other end is connected with the soft start input pin 43 of power-supply controller of electric 39.
Said voltage-regulating circuit comprises the 5th resistance 35, the 4th resistance 34, triode 33, three end parallel connection type voltage stabilizing didoes 22, first resistance 27 and second resistance 26; The collector electrode of the negative pole of said DC power supply 36, the 5th resistance 35, the 4th resistance 34, triode 33 connects successively, and the feedback input pin 42 of said power-supply controller of electric 39 is connected on the interface of the 5th resistance 35 and the 4th resistance 34; The emitter of said triode 33 is connected with reference ground, and its base stage is connected with the negative electrode 23 of three end parallel connection type voltage stabilizing didoes 22, and the anode 25 of said three end parallel connection type voltage stabilizing didoes 22 is connected with an end of negative voltage output 45, inductance 31 respectively; The reference utmost point 24 of said three end parallel connection type voltage stabilizing didoes 22 is connected with an end of second resistance 26, and the other end of second resistance 26 is connected with the negative electrode of first diode 30, the earth terminal of load 28 respectively; The two ends of said first resistance 27 are connected with the reference utmost point 24 of three end parallel connection type voltage stabilizing didoes 22, the anode 25 of three end parallel connection type voltage stabilizing didoes 22 respectively.
Said voltage-regulating circuit also comprises the 3rd resistance 32, and an end of said the 3rd resistance 32 is connected with the base stage of triode 33, and the other end is connected with emitter, the reference ground of triode 33 respectively.
Said first diode 30 is a Schottky diode.
Said triode 33 is the PNP triode.
By negative voltage transform method between the direct current of foregoing circuit, comprise the steps:
(1) soft start: before applying DC power supply 36, the voltage in the soft starting circuit on second electric capacity 37 is zero, apply DC power supply 36 after, the voltage on second electric capacity 37 is that the voltage on the soft start input pin 43 of power-supply controller of electric 39 increases by zero gradually; When the voltage on second electric capacity 37 is that voltage on the soft start input pin 43 of power-supply controller of electric 39 is during greater than the inner starting resistor of power-supply controller of electric 39; Then accomplished soft start-up process, the time of its soft start is confirmed by the 6th resistance 38 in the soft starting circuit and the size of second electric capacity 37;
The charging of (2) first electric capacity 29: after the negative voltage translation circuit is accomplished soft start between said direct current; When the inner pliotron conducting of power-supply controller of electric 39; Form low impedance path between the pliotron collector electrode output pin 40 of power-supply controller of electric 39 and the reference ground pin 41, DC power supply 36 is given inductance 31 and 29 chargings of first electric capacity; When the inner pliotrons of power-supply controller of electric 39 turn-offed, the electric current in the inductance 31 changed by the pliotron conducting once more that continues to discharge for first electric capacity, 29 chargings energy stored in inductance 31 through first diode 30 and finish or power-supply controller of electric 39 is inner; Realize that first electric capacity 29 all obtains charging in inductance 31 storage power and the process that releases energy, to have reduced the ripple of output voltage, increase the carrying load ability and the efficient of negative voltage translation circuit between said direct current;
(3) voltage adjustment:
(3-1) adjustment of boosting: after the negative voltage translation circuit is accomplished soft start between said direct current; In the voltage-regulating circuit; When the voltage magnitude of negative voltage output 45 descends; Correspondingly be loaded into the reference utmost point 24 of three end parallel connection type voltage stabilizing didoes 22 and the voltage between the anode 25 also descends through first resistance 27 and second resistance, 26 dividing potential drops; If the reference utmost point 24 and the reference voltage of the voltage between the anode 25 that are loaded into three end parallel connection type voltage stabilizing didoes 22 through first resistance 27 and second resistance, 26 dividing potential drops less than three end parallel connection type voltage stabilizing didoes, 22 inside; Then the input current of the negative electrode 23 of three end parallel connection type voltage stabilizing didoes 22 descends, and the electric current of triode 33 collector electrodes descends simultaneously, and the voltage that is loaded into the feedback input pin 42 of power-supply controller of electric 39 through the 4th resistance 34 and the 5th resistance 35 also descends; Power-supply controller of electric 39 correspondingly increases the ON time of internal power triode; Reducing its turn-off time, thereby increase charging current and the charging interval, improve the voltage of negative voltage output 45 first electric capacity 29;
(3-2) step-down adjustment: after the negative voltage translation circuit is accomplished soft start between said direct current; In the voltage-regulating circuit; When the voltage magnitude of negative voltage output 45 rises; Correspondingly be loaded into the reference utmost point 24 of three end parallel connection type voltage stabilizing didoes 22 and the voltage between the anode 25 also rises through first resistance 27 and second resistance, 26 dividing potential drops; If the reference utmost point 24 and the reference voltage of the voltage between the anode 25 that are loaded into three end parallel connection type voltage stabilizing didoes 22 through first resistance 27 and second resistance, 26 dividing potential drops greater than three end parallel connection type voltage stabilizing didoes, 22 inside; Then the input current of the negative electrode 23 of three end parallel connection type voltage stabilizing didoes 22 rises, and the electric current of the collector electrode of triode 33 rises simultaneously, and the voltage that is loaded into the feedback input pin 42 of power-supply controller of electric 39 through the 4th resistance 34 and the 5th resistance 35 also rises; Power-supply controller of electric 39 correspondingly reduces the ON time of internal power triode; Increasing its turn-off time, thereby reduce charging current and charging interval, reduce the voltage of negative voltage output 45 first electric capacity 29.
In the said step (3); Voltage-regulating circuit is when boosting adjustment or step-down adjustment; The leakage current bypass that the 3rd resistance 32 is realized three end parallel connection type voltage stabilizing didoes 22 prevents that the leakage current of three end parallel connection type voltage stabilizing didoes 22 from producing adverse influence to feedback loop.
The foregoing description is a preferred implementation of the present invention; But execution mode of the present invention is not restricted to the described embodiments; Other any do not deviate from change, the modification done under spirit of the present invention and the principle, substitutes, combination, simplify; All should be the substitute mode of equivalence, be included within protection scope of the present invention.
Claims (7)
1. negative voltage translation circuit between direct current; It is characterized in that: comprise DC power supply, power-supply controller of electric, inductance, first diode, first electric capacity, load, soft starting circuit and voltage-regulating circuit; Said power-supply controller of electric comprises pliotron collector electrode output pin, reference ground pin, feedback input pin, soft start input pin and power pins; One end of said load is drawn the negative voltage output, and the other end is for connecting the earth terminal with reference to ground; The positive pole of said DC power supply connects with reference to ground, and its negative pole is connected with the reference ground pin of power-supply controller of electric; The power pins of said power-supply controller of electric is connected with the negative voltage output, and the pliotron collector electrode output pin of said power-supply controller of electric is connected with the anode of first diode; One end of said inductance is connected with the anode of first diode, and its other end is connected with an end and the negative voltage output of an end of first electric capacity, voltage-regulating circuit, said load respectively; The negative electrode of said first diode is connected with the other end of voltage-regulating circuit, first electric capacity and the earth terminal of load respectively; The two ends of first electric capacity are connected with the two ends of load respectively; Said soft starting circuit is connected with soft start input pin, the negative pole of DC power supply, the reference ground of power-supply controller of electric respectively; Said voltage-regulating circuit is connected with earth terminal with reference to the negative pole of ground, DC power supply, feedback input pin, negative voltage output, load respectively.
2. negative voltage translation circuit between direct current according to claim 1; It is characterized in that: said soft starting circuit comprises second electric capacity and the 6th resistance; The two ends of said second electric capacity are connected with the negative pole of DC power supply, the soft start input pin of power-supply controller of electric respectively; One end of said the 6th resistance connects with reference to ground, and the other end is connected with the soft start input pin of power-supply controller of electric.
3. negative voltage translation circuit between direct current according to claim 1; It is characterized in that: said voltage-regulating circuit comprises the 5th resistance, the 4th resistance, triode, three end parallel connection type voltage stabilizing didoes, first resistance and second resistance; The collector electrode of the negative pole of said DC power supply, the 5th resistance, the 4th resistance, triode connects successively, and the feedback input pin of said power-supply controller of electric is connected on the interface of the 5th resistance and the 4th resistance; The emitter of said triode is connected with reference ground, and its base stage is connected with the negative electrode of three end parallel connection type voltage stabilizing didoes, and the anode of said three end parallel connection type voltage stabilizing didoes is connected with an end of negative voltage output, inductance respectively; The reference utmost point of said three end parallel connection type voltage stabilizing didoes is connected with an end of second resistance, and the other end of second resistance is connected with the negative electrode of first diode, the earth terminal of load respectively; The two ends of said first resistance are connected with the reference utmost point, the anode of three end parallel connection type voltage stabilizing didoes respectively.
4. negative voltage translation circuit between direct current according to claim 3; It is characterized in that: said voltage-regulating circuit also comprises the 3rd resistance; One end of said the 3rd resistance is connected with the base stage of triode, and the other end is connected with emitter, the reference ground of triode respectively.
5. according to negative voltage translation circuit between each described direct current of claim 1～4, it is characterized in that: said first diode is a Schottky diode.
6. by negative voltage transform method between the direct current of each said circuit realization of claim 1～5, it is characterized in that, comprise the steps:
(1) soft start: before applying DC power supply, the voltage in the soft starting circuit on second electric capacity is zero, apply DC power supply after, the voltage on second electric capacity is that the voltage on the soft start input pin of power-supply controller of electric increases by zero gradually; When the voltage on second electric capacity is that voltage on the soft start input pin of power-supply controller of electric is during greater than the starting resistor of power-supply controller of electric inside; Then accomplished soft start-up process, the time of its soft start is confirmed by the size of the 6th resistance in the soft starting circuit and second electric capacity;
The charging of (2) first electric capacity: after the negative voltage translation circuit is accomplished soft start between said direct current; When the inner pliotron conducting of power-supply controller of electric; Form low impedance path between the pliotron collector electrode output pin of power-supply controller of electric and the reference ground pin, DC power supply is given inductance and the charging of first electric capacity; When the inner pliotron of power-supply controller of electric turn-offed, the electric current in the inductance changed by continuing through first diode to first electric capacity charging pliotron conducting once more that energy stored release finishes or power-supply controller of electric is inner in inductance; Realize that first electric capacity all obtains charging in inductance storage power and the process that releases energy;
(3) voltage adjustment:
(3-1) adjustment of boosting: after the negative voltage translation circuit is accomplished soft start between said direct current; In the voltage-regulating circuit; When the voltage magnitude of negative voltage output descends; Correspondingly be loaded into the reference utmost point of three end parallel connection type voltage stabilizing didoes and the voltage between the anode also descends through first resistance and second electric resistance partial pressure; If the reference utmost point and the voltage between the anode that are loaded into three end parallel connection type voltage stabilizing didoes through first resistance and second electric resistance partial pressure are less than the inner reference voltage of three end parallel connection type voltage stabilizing didoes; Then the input current of the negative electrode of three end parallel connection type voltage stabilizing didoes descends, and the electric current of transistor collector descends simultaneously, and the voltage that is loaded into the feedback input pin of power-supply controller of electric through the 4th resistance and the 5th resistance also descends; Power-supply controller of electric correspondingly increases the ON time of internal power triode, to reduce its turn-off time;
(3-2) step-down adjustment: after the negative voltage translation circuit is accomplished soft start between said direct current; In the voltage-regulating circuit; When the voltage magnitude of negative voltage output rises; Correspondingly be loaded into the reference utmost point of three end parallel connection type voltage stabilizing didoes and the voltage between the anode also rises through first resistance and second electric resistance partial pressure; If the reference utmost point and the voltage between the anode that are loaded into three end parallel connection type voltage stabilizing didoes through first resistance and second electric resistance partial pressure are greater than the inner reference voltage of three end parallel connection type voltage stabilizing didoes; Then the input current of the negative electrode of three end parallel connection type voltage stabilizing didoes rises, and the electric current of the collector electrode of triode rises simultaneously, and the voltage that is loaded into the feedback input pin of power-supply controller of electric through the 4th resistance and the 5th resistance also rises; Power-supply controller of electric correspondingly reduces the ON time of internal power triode, to increase its turn-off time.
7. according to negative voltage transform method between the direct current of the said circuit of claim 6; It is characterized in that: in the said step (3); Voltage-regulating circuit is when boosting adjustment or step-down adjustment, and the 3rd resistance is realized the leakage current bypass to three end parallel connection type voltage stabilizing didoes.
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| CN104135150B (en) * | 2013-05-03 | 2017-11-21 | 深圳市海洋王照明工程有限公司 | A kind of power circuit |
| CN104375544B (en) * | 2014-08-01 | 2018-03-09 | 重庆工商职业学院 | Millimeter wave amplifier sequential dc source |
| CN107658863B (en) * | 2017-10-09 | 2024-03-08 | 珠海格力电器股份有限公司 | Circuit for inhibiting impact of direct-current capacitive load switching on direct-current micro-grid |
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| Title |
|---|
| JP特开平11-18416A 1999.01.22 |
| JP特开平11-98822A 1999.04.09 |
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| Publication number | Publication date |
|---|---|
| CN101976946A (en) | 2011-02-16 |
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