CN101478231A - Voltage stabilizing circuit having time keeping function - Google Patents

Voltage stabilizing circuit having time keeping function Download PDF

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Publication number
CN101478231A
CN101478231A CNA2008102419480A CN200810241948A CN101478231A CN 101478231 A CN101478231 A CN 101478231A CN A2008102419480 A CNA2008102419480 A CN A2008102419480A CN 200810241948 A CN200810241948 A CN 200810241948A CN 101478231 A CN101478231 A CN 101478231A
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China
Prior art keywords
retention time
terminal
input
charge
voltage stabilizing
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Granted
Application number
CNA2008102419480A
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Chinese (zh)
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CN101478231B (en
Inventor
朱春辉
黄晶晶
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Vertiv Tech Co Ltd
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Emerson Network Power Co Ltd
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Priority to CN2008102419480A priority Critical patent/CN101478231B/en
Publication of CN101478231A publication Critical patent/CN101478231A/en
Application granted granted Critical
Publication of CN101478231B publication Critical patent/CN101478231B/en
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Abstract

A voltage regulator circuit with the function of holding time comprises a three-terminal integrated voltage regulator, an input filter capacitor and a commutation diode. A holding time circuit connected in parallel is provided between input or output terminal of the three-terminal integrated voltage regulator and the common. The holding time circuit is a two-terminal network which is formed by connecting in series with a charge-discharge capacitor for holding time after parallel connection of a charging resistor and a discharge diode. One terminal of the two-terminal network is the cathode of the discharge diode which is connected with the input or output terminal of the three-terminal integrated voltage regulator. The anode of the discharge diode is connected with the anode of the charge-discharge capacitor for holding time. The other terminal is the cathode of the charge-discharge capacitor for holding time is connected with the common. The conventional filter capacitor of the voltage regulator circuit is separated from the charge-discharge capacitor for holding time by the voltage regulator circuit. The charge-discharge capacitor for holding time is the capacitance with optional capacity to ensure the output voltage of the voltage regulator circuit satisfies the holding time required. Then the problem that power module is difficult to be started due to selection of the holding time capacitance with larger capacity can be effectively avoided.

Description

A kind of voltage stabilizing circuit with retention time function
Technical field
The present invention relates to voltage stabilizing circuit, especially relate to a kind of voltage stabilizing circuit with retention time function.
Background technology
The three ends as shown in Figure 1 fixedly back level voltage stabilizing circuit of integrated regulator are used very extensive in power supply, for making its output voltage that certain retention time be arranged, require the capacity of filter capacitor C1 enough big, and large bulk capacitance is equivalent to short circuit when power initiation, filter capacitor C1 capacity is big more, and rectifier diode D1 is high more and the time is long more to the current peak of its charging.This charging current is understood the electric current that produces high peaks after converting former limit by transformer, makes the peak current protection be designed to a difficult problem.Want the peaking protection sensitive on the one hand, but can cause when starting that filter capacitor C1 charging current is excessive and trigger the misoperation of peak current protective circuit, cause power module not start smoothly, generally show as " having the hiccups ", will suitably improve at this situation peak value protection action threshold value; The peak current that operate as normal was produced after power module started on the other hand is lower again, and the action threshold value of peak current protective circuit can not design too high, in case power module is exported when overcurrent takes place, the peak value protection should be able to be with the duty ratio restriction firmly.In a word; both required the capacity of filter capacitor C1 enough big; to obtain the long output voltage retention time; require again to guarantee that power module can start smoothly; the action threshold value of peak current protective circuit just must be designed to high value; this situation will appear in this moment: be short-circuited or during overcurrent, power module can not be realized reliable and effective protection at the output loading end, this moment, the electric current by rectifier diode D1 will be very big.Just make the output voltage of three terminal integrated voltage stabilizer have the function of longer retention time,, the problem that power module starts difficulty will occur if on the control circuit of former limit, do not take special start-up circuit design by the mode that strengthens the filter capacitor capacity.
Summary of the invention
Technical problem to be solved by this invention is to remedy above-mentioned the deficiencies in the prior art, proposes a kind of voltage stabilizing circuit with retention time function.
Technical problem of the present invention is solved by the following technical solutions:
This voltage stabilizing circuit with retention time function, comprise three terminal integrated voltage stabilizer and be connected in its input in parallel and public ground between input filter capacitor, be connected in parallel between its output and the public ground output filter capacitor, and being connected in series in rectifier diode between voltage stabilizing circuit input and the three terminal integrated voltage stabilizer input, the electric current that flows through described rectifier diode charges to described input filter capacitor.
This characteristics with voltage stabilizing circuit of retention time function are:
Between described three terminal integrated voltage stabilizer input or output and public ground, be provided with the retention time circuit that is connected in parallel.
The two-terminal network that is connected in series and forms with charge and discharge capacitance with the retention time again after described retention time circuit is connected in parallel by charging resistor and discharge diode, one end of described two-terminal network is that the negative electrode of described discharge diode is connected with described three terminal integrated voltage stabilizer input or output, the anode of described discharge diode is connected with the positive pole of described retention time with charge and discharge capacitance, the other end of described two-terminal network be the described retention time with the negative pole of charge and discharge capacitance be connected publicly.
When described rectifier diode has output voltage, be no more than under the condition of setting range in the restriction charging current by described charging resistor the charge and discharge capacitance that the retention time is provided is finished charging.At described rectifier diode output voltage is zero when inputing or outputing the filter capacitor magnitude of voltage, and the energy of described charge and discharge capacitance is discharged into three terminal integrated voltage stabilizer or load by described discharge diode, guarantees that circuit output voltage is stable within the specific limits; And when described rectifier diode had normal output voltage, described discharge diode cut off the current path of rectifier diode and charge and discharge capacitance, by charging resistor charge and discharge capacitance was charged.
The described retention time is a random capacity electric capacity with charge and discharge capacitance, and its capacity was associated with the retention time of requirement.And the described filter capacitor capacity that inputs or outputs is less relatively, thereby the output voltage that makes voltage stabilizing circuit has the retention time that meets the demands, the capacity that needn't require to input or output filter capacitor again is very big, described rectifier diode can not produce too high peak current after the charging current that comprises filter capacitor and charge and discharge capacitance is converted former limit by transformer, thereby effectively avoids occurring the problem that power module starts difficulty.
Technical problem of the present invention adopts following further technical scheme to be solved:
The described retention time decides according to loading condition, is the hundreds of Millisecond.
Described three terminal integrated voltage stabilizer is fixedly integrated regulator, three end adjustable voltage-regulating ic devices or switch three terminal integrated voltage stabilizers of linear three ends.
Preferably, described three ends fixedly integrated regulator be fixedly integrated regulators of L7812 molded lines three ends.
Preferably, described switch three terminal integrated voltage stabilizer is a L5973 type switch integrated regulator.
The beneficial effect that the present invention is compared with the prior art is:
Voltage stabilizing circuit with retention time function of the present invention, on the conventional basis of separating with charge and discharge capacitance of voltage stabilizing circuit with filter capacitor and retention time, retention time can be selected random capacity electric capacity for use with charge and discharge capacitance, with the retention time that the output voltage that guarantees voltage stabilizing circuit meets the demands, effectively avoid simultaneously power module occurring because the startup difficult problem that the higher capacity filter capacitor is brought.
Description of drawings
Fig. 1 is the circuit diagram of existing voltage stabilizing circuit;
Fig. 2 is the circuit diagram of the specific embodiment of the invention one;
Fig. 3 is the circuit diagram of the specific embodiment of the invention two.
Embodiment
Below in conjunction with embodiment and contrast accompanying drawing the invention will be further described.
Embodiment one
A kind of three-terminal voltage-stabilizing circuit as shown in Figure 2 with retention time function, comprise L7812 molded lines three ends fixedly integrated regulator U1 and be connected in its input IN in parallel and public ground between input filter capacitor C1, be connected in parallel between its output OUT and the public ground output filter capacitor C3, and being connected in series in the fixedly rectifier diode D1 between the integrated regulator of voltage stabilizing circuit input INPUT and L7812 molded lines three ends, the electric current that flows through rectifier diode D1 charges to input filter capacitor C1.
Fixedly be provided with the retention time circuit that is connected in parallel between integrated regulator U1 input IN and the public ground GND at L7812 molded lines three ends, the two-terminal network that the random capacity charge and discharge capacitance C2 that uses with the retention time again after the retention time circuit is connected in parallel by charging resistor R1 and discharge diode D2 is connected in series and forms, one end of two-terminal network be discharge diode D2 negative electrode and L7812 molded lines three ends fixedly integrated regulator U1 input IN be connected, the anode of discharge diode D2 is connected with the positive pole of retention time with random capacity charge and discharge capacitance C2, and the other end of two-terminal network is to use the negative pole of random capacity charge and discharge capacitance C2 to be connected with public ground GND the retention time.
At rectifier diode D1 output voltage is zero to charge and discharge capacitance C2 voltage setting value, when being input filter capacitor C1 magnitude of voltage, charge and discharge capacitance C2 in filter capacitor C1 and the retention time circuit respectively backward the level three terminal integrated voltage stabilizer energy is provided, wherein filter capacitor C1 directly backward the level three terminal integrated voltage stabilizer energy is provided, charge and discharge capacitance C2 by discharge diode D2 backward a level three terminal integrated voltage stabilizer energy is provided, guarantee that circuit output voltage is stable within the specific limits; And when rectifier diode D1 had normal output voltage, discharge diode cut off the current path of rectifier diode D1 and random capacity charge and discharge capacitance C2.
This embodiment can have at the output voltage of voltage stabilizing circuit under the retention time condition that meets the demands, and effectively avoids occurring the problem that power module starts difficulty.Retention time decides according to loading condition, is the hundreds of Millisecond.
Embodiment two
Another kind as shown in Figure 3 has the three-terminal voltage-stabilizing circuit of retention time function, it also comprise L7812 molded lines three ends fixedly integrated regulator U1 and be connected in its input IN in parallel and public ground between input filter capacitor C1, be connected in parallel between its output OUT and the public ground output filter capacitor C3, and being connected in series in the fixedly rectifier diode D1 between the integrated regulator of voltage stabilizing circuit input INPUT and L7812 molded lines three ends, the electric current that flows through rectifier diode D1 charges to input filter capacitor C1.
Be with the difference of embodiment one: the retention time circuit that the random capacity charge and discharge capacitance C2 that uses with the retention time again after being connected in parallel by charging resistor R1 and discharge diode D2 is connected in series and forms is to be connected in L7812 molded lines three ends in parallel fixedly between integrated regulator U1 output OUT and the public ground GND.
This embodiment two has and embodiment one essentially identical beneficial effect, can have at the output voltage of voltage stabilizing circuit under the retention time condition that meets the demands, and effectively avoids occurring the problem that power module starts difficulty.Retention time decides according to loading condition, is the hundreds of Millisecond.
Above content be in conjunction with concrete preferred implementation to further describing that the present invention did, can not assert that concrete enforcement of the present invention is confined to these explanations.For the general technical staff of the technical field of the invention; make some alternative or obvious modification that are equal to without departing from the inventive concept of the premise; and performance or purposes are identical, then should be considered as belonging to the protection range that the present invention is determined by claims of being submitted to.

Claims (10)

1. voltage stabilizing circuit with retention time function, comprise three terminal integrated voltage stabilizer and be connected in its input in parallel and public ground between input filter capacitor, be connected in parallel between its output and the public ground output filter capacitor, and be connected in series in rectifier diode between voltage stabilizing circuit input and the three terminal integrated voltage stabilizer input, the electric current that flows through described rectifier diode charges to described input filter capacitor, it is characterized in that:
Between described three terminal integrated voltage stabilizer input and public ground, be provided with the retention time circuit that is connected in parallel.
2 voltage stabilizing circuits with retention time function as claimed in claim 1 is characterized in that:
The two-terminal network that is connected in series and forms with charge and discharge capacitance with the retention time again after described retention time circuit is connected in parallel by charging resistor and discharge diode, one end of described two-terminal network is that the negative electrode of described discharge diode is connected with described three terminal integrated voltage stabilizer input, the anode of described discharge diode is connected with the positive pole of described retention time with charge and discharge capacitance, the other end of described two-terminal network be the described retention time with the negative pole of charge and discharge capacitance be connected publicly.
3. the voltage stabilizing circuit with retention time function as claimed in claim 1 or 2 is characterized in that:
Described three terminal integrated voltage stabilizer is fixedly integrated regulator, three end adjustable voltage-regulating ic devices or switch three terminal integrated voltage stabilizers of linear three ends.
4. the voltage stabilizing circuit with retention time function as claimed in claim 3 is characterized in that:
Described three ends fixedly integrated regulator are fixedly integrated regulators of L7812 molded lines three ends.
5 voltage stabilizing circuits with retention time function as claimed in claim 3 is characterized in that:
Described switch three terminal integrated voltage stabilizer is a L5973 type switch integrated regulator.
6. voltage stabilizing circuit with retention time function, comprise three terminal integrated voltage stabilizer and be connected in its input in parallel and public ground between input filter capacitor, be connected in parallel between its output and the public ground output filter capacitor, and be connected in series in rectifier diode between voltage stabilizing circuit input and the three terminal integrated voltage stabilizer input, the electric current that flows through described rectifier diode charges to described input filter capacitor, it is characterized in that:
Between described three terminal integrated voltage stabilizer output and public ground, be provided with the retention time circuit that is connected in parallel.
7 voltage stabilizing circuits with retention time function as claimed in claim 6 is characterized in that:
The two-terminal network that is connected in series and forms with charge and discharge capacitance with the retention time again after described retention time circuit is connected in parallel by charging resistor and discharge diode, one end of described two-terminal network is that the negative electrode of described discharge diode is connected with described three terminal integrated voltage stabilizer output, the anode of described discharge diode is connected with the positive pole of described retention time with charge and discharge capacitance, the other end of described two-terminal network be the described retention time with the negative pole of charge and discharge capacitance be connected publicly.
8. as claim 6 or 7 described voltage stabilizing circuits, it is characterized in that with retention time function:
Described three terminal integrated voltage stabilizer is fixedly integrated regulator, three end adjustable voltage-regulating ic devices or switch three terminal integrated voltage stabilizers of linear three ends.
9. the voltage stabilizing circuit with retention time function as claimed in claim 8 is characterized in that:
Described three ends fixedly integrated regulator are fixedly integrated regulators of L7812 molded lines three ends.
10 voltage stabilizing circuits with retention time function as claimed in claim 8 is characterized in that:
Described switch three terminal integrated voltage stabilizer is a L5973 type switch integrated regulator.
CN2008102419480A 2008-12-29 2008-12-29 Voltage stabilizing circuit having time keeping function Active CN101478231B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2008102419480A CN101478231B (en) 2008-12-29 2008-12-29 Voltage stabilizing circuit having time keeping function

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Application Number Priority Date Filing Date Title
CN2008102419480A CN101478231B (en) 2008-12-29 2008-12-29 Voltage stabilizing circuit having time keeping function

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CN101478231A true CN101478231A (en) 2009-07-08
CN101478231B CN101478231B (en) 2011-11-30

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102104335A (en) * 2011-01-07 2011-06-22 深圳市九洲电器有限公司 Three-terminal voltage regulator for power supply
CN103560664A (en) * 2013-09-11 2014-02-05 昆山新金福精密电子有限公司 Voltage-stabilizing power supply
CN106230251A (en) * 2016-07-26 2016-12-14 株洲中车时代电气股份有限公司 A kind of EMC performance boost device of DC source

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102104335A (en) * 2011-01-07 2011-06-22 深圳市九洲电器有限公司 Three-terminal voltage regulator for power supply
CN103560664A (en) * 2013-09-11 2014-02-05 昆山新金福精密电子有限公司 Voltage-stabilizing power supply
CN106230251A (en) * 2016-07-26 2016-12-14 株洲中车时代电气股份有限公司 A kind of EMC performance boost device of DC source

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Publication number Publication date
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Address after: 518057 Nanshan District science and Technology Industrial Park, Guangdong, Shenzhen Branch Road, No.

Patentee after: Vitamin Technology Co., Ltd.

Address before: 518057 Nanshan District science and Technology Industrial Park, Guangdong, Shenzhen Branch Road, No.

Patentee before: Aimosheng Network Energy Source Co., Ltd.