CN111026224B - Auxiliary circuit - Google Patents
Auxiliary circuit Download PDFInfo
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- CN111026224B CN111026224B CN201911317113.3A CN201911317113A CN111026224B CN 111026224 B CN111026224 B CN 111026224B CN 201911317113 A CN201911317113 A CN 201911317113A CN 111026224 B CN111026224 B CN 111026224B
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
- G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
- G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices
- G05F1/565—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices sensing a condition of the system or its load in addition to means responsive to deviations in the output of the system, e.g. current, voltage, power factor
- G05F1/569—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices sensing a condition of the system or its load in addition to means responsive to deviations in the output of the system, e.g. current, voltage, power factor for protection
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
- G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
- G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices
- G05F1/577—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices for plural loads
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Automation & Control Theory (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses an auxiliary circuit, which is applied to a switching power supply comprising a controllable precise voltage-stabilizing source U1 and is characterized in that: the circuit comprises resistors R3-R7, capacitors C1 and C2, a diode D1, a zener diode Z1 and a PNP triode Q1; the anode of a diode D1 is connected with the hot end of the secondary winding of the transformer of the power supply module, the cathode of a diode D1 is simultaneously connected with one ends of a capacitor C1, a resistor R3 and a resistor R5, the other end of the resistor R3 is connected with the cathode of a voltage stabilizing diode Z1, the anode of a voltage stabilizing diode Z1 is simultaneously connected with one ends of a capacitor C2, a resistor R4 and a resistor R6, the other ends of the capacitor C1, the resistor R5, the capacitor C2 and the resistor R4 are all connected with the output negative Vo of the power supply module, the other end of the resistor R6 is connected with the base of a triode Q1, the collector of the triode Q1 is connected with one end of the output negative Vo-emitter of. The auxiliary circuit can realize the function of awakening the power module, so that the control chip cannot fall into a dormant state due to output over-feedback.
Description
Technical Field
The present invention relates to power modules, and more particularly to output assist control of power modules.
Background
The birth of the power supply module reflects the continuous progress of the development of the power supply industry in recent years, the power supply module is a new direction of the development of integrated circuits, has wide application prospect, and the research on the multi-module parallel connection and power supply module output voltage regulation technology is increasingly increased along with the development of the power supply industry.
Fig. 1 is a circuit diagram of a power output loop control circuit. The device comprises a transformer T1, a resistor R1, a resistor R2, a resistor R8, a resistor R9, a capacitor EC1, a capacitor EC2, a diode D2, a filter inductor L1, a controllable precision voltage-stabilizing source U1 and an optical coupler OP 1; the anode of a diode D2 is connected with the hot end of a secondary winding of a transformer T1, the cathode of a diode D2 is simultaneously connected with the anode of a capacitor EC1, one end of a filter inductor L1 and one end of a resistor R8, the cathode of the capacitor EC1 is simultaneously connected with the cold end of a secondary winding of a transformer T1 and the negative Vo output of a power module, the other end of an inductor L1 is simultaneously connected with the anode of a capacitor EC2, one end of a resistor R1 and the positive Vo output of the power module, the cathode of the capacitor EC2 is connected with the negative Vo output of the power module, the other end of a resistor R8 is simultaneously connected with the pin 1 of an optical coupler OP1 and one end of a resistor R9, the pin 2 of the optical coupler OP1 and the other end of the resistor R9 are connected with the cathode of a controllable precise voltage stabilizing source U1 of the power module, the base of the controllable precise voltage stabilizing source U1 of.
Note: "transformer secondary winding cold end" refers to the end of the transformer secondary winding connected to the negative Vo-of the power module output, i.e. 10 in fig. 1; "transformer secondary hot terminal" refers to the terminal of the transformer secondary not connected to the power module output negative Vo-, i.e., terminal 12 in fig. 1.
The controllable precise voltage regulator U1 in the power module of fig. 1 plays a role in controlling output voltage and regulating a loop in the power module, and if the controllable precise voltage regulator U1 has over feedback, the following problems can be caused:
(1) the output of the multiple modules is connected in parallel, and the power supply chip stops outputting the driving signal after the feedback of the individual module.
The two power modules of the first module and the second module are supposed to be used in parallel, namely, the phase line end of the first module is connected with the phase line end of the second module to form the phase line end L of the power parallel system, the zero line end of the first module is connected with the zero line end of the second module to form the zero line end N of the power parallel system, the output positive of the first module is connected with the output positive of the second module to form the output positive Vo + of the power parallel system, and the output negative of the first module is connected with the output negative of the second module to form the output negative Vo-of the power parallel system. Although the circuit parameters of the first module and the second module are completely the same, due to the difference of components, the difference of the output voltages of the first module and the second module causes that when the multiple modules are connected in parallel and output is in no-load, a controllable precise voltage-stabilizing source U1(TL431) in the module with lower output voltage is in a saturated conduction state, the power chip is in a dormant state due to over-feedback, and when the output is switched to be in heavy-load, the dormant module cannot respond in time, so that the whole parallel system can carry out over-power protection.
(2) The output voltage of the single module is adjusted from high to low, the module is fed back too much, and the power supply chip stops outputting the driving signal.
Assuming that R2 is a sliding rheostat, the power module can achieve the function of adjusting the output voltage, when the module outputs no load, the voltage is adjusted at this time, the resistance value of the sliding rheostat is adjusted from small to large, that is, in the process of adjusting the output voltage from high to low, a controllable precise voltage regulator U1(TL431) is in a saturated conduction state instantaneously, the power chip is in a sleep state due to over-feedback, and the output power failure phenomenon occurs.
Therefore, there is a need for improvements in the prior art.
Disclosure of Invention
In view of this, the technical problem to be solved by the present invention is to provide an auxiliary control method for a switching power supply, which realizes that a module is in a wake-up state when outputting no load.
The inventive concept of the present application results from:
(1) when multiple modules are connected in parallel for use, in order to ensure that each module is in an awakening state during no-load, an auxiliary circuit needs to be designed to control the level of the base of the TL431 so that the TL431 is not in saturated conduction.
(2) When the module outputs no load, in order to ensure that the output voltage is adjusted from high to low, the output does not generate over feedback to cause the power chip to be in a dormant state, an auxiliary circuit is required to be designed to control the level of the base electrode of the TL431, so that the TL431 is not in saturated conduction.
In order to solve the technical problems, the technical scheme provided by the invention is as follows:
an auxiliary circuit is applied to a switching power supply comprising a controllable precise voltage-stabilizing source U1, wherein the controllable precise voltage-stabilizing source U1 is used for controlling the output voltage and regulating a loop of the switching power supply, and is characterized in that: the auxiliary circuit comprises a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a capacitor C1, a capacitor C2, a diode D1, a zener diode Z1 and a PNP triode Q1; the anode of a diode D1 is connected with the hot end of a secondary winding of a transformer of the power supply module, the cathode of a diode D1 is simultaneously connected with one end of a capacitor C1, one end of a resistor R3 and one end of a resistor R5, the other end of a capacitor C1 and the other end of a resistor R5 are connected with the negative Vo output of the power supply module, the other end of a resistor R3 is connected with the cathode of a zener diode Z1, the anode of the zener diode Z1 is simultaneously connected with one end of a capacitor C2, one end of a resistor R4 and one end of a resistor R6, the other end of the capacitor C2 and the other end of a resistor R4 are connected with the negative Vo output of the power supply module, the other end of the resistor R6 is connected with the base of a triode Q1, the collector of the triode Q1 is connected with the.
As an equivalent alternative to the above technical solution, another technical solution provided by the present invention is as follows:
an auxiliary circuit is applied to a switching power supply comprising a controllable precise voltage-stabilizing source U1, wherein the controllable precise voltage-stabilizing source U1 is used for controlling the output voltage and regulating a loop of the switching power supply, and is characterized in that: the auxiliary circuit comprises a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a capacitor C1, a capacitor C2, a diode D1, a voltage stabilizing diode Z1 and a PMOS tube Q1; the anode of a diode D1 is connected with the hot end of a secondary winding of a transformer of the power supply module, the cathode of a diode D1 is simultaneously connected with one end of a capacitor C1, one end of a resistor R3 and one end of a resistor R5, the other end of a capacitor C1 and the other end of a resistor R5 are connected with the negative Vo output of the power supply module, the other end of a resistor R3 is connected with the cathode of a voltage stabilizing diode Z1, the anode of a voltage stabilizing diode Z1 is simultaneously connected with one end of a capacitor C2, one end of a resistor R4 and one end of a resistor R6, the other end of the capacitor C2 and the other end of a resistor R4 are connected with the negative Vo output of the power supply module, the other end of the resistor R6 is connected with the grid of a PMOS tube Q1, the drain of the PMOS tube Q1 is connected with.
The working principle of the invention will be analyzed in detail by combining with specific embodiments, which are not described herein, and compared with the prior art, the invention has the following beneficial effects:
1. the circuit of the scheme can well realize that the parallel system is in a wake-up state during no-load or single-module no-load voltage regulation;
2. the device has low cost, easy design and high reliability.
Drawings
FIG. 1 is a circuit diagram of a power output loop control circuit;
FIG. 2 is a diagram of an output auxiliary circuit according to an embodiment of the present invention.
Detailed Description
In order to make the invention more clearly understood, the invention is further described in detail below with reference to the attached drawings and examples. The specific embodiments described herein are merely illustrative of the invention and do not delimit the invention.
Fig. 2 shows an auxiliary circuit diagram according to an embodiment of the present invention, which includes a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a capacitor C1, a capacitor C2, a diode D1, a zener diode Z1, and a PNP transistor Q1; the anode of a diode D1 is connected with the hot end of a secondary winding of a transformer of the power supply module, the cathode of a diode D1 is simultaneously connected with one end of a capacitor C1, one end of a resistor R3 and one end of a resistor R5, the other end of a capacitor C1 and the other end of a resistor R5 are connected with the negative Vo output of the power supply module, the other end of a resistor R3 is connected with the cathode of a zener diode Z1, the anode of the zener diode Z1 is simultaneously connected with one end of a capacitor C2, one end of a resistor R4 and one end of a resistor R6, the other end of the capacitor C2 and the other end of a resistor R4 are connected with the negative Vo output of the power supply module, the other end of the resistor R6 is connected with the base of a triode Q1, the collector of the triode Q1 is connected with the.
The working principle analysis of the embodiment when applied to the parallel module is as follows:
because each parallel module is internally provided with the part of the circuit, when the same modules are used in parallel, the output voltage has slight deviation because the parameters of the modules have slight deviation. Supposing that when the output is respectively provided with no load, the output voltage of the first module is 0.2V higher than that of the second module, when the output is used in parallel, the first module charges towards the second module, the voltage EC2 of the output capacitor of the second module can be instantly increased, the voltage of the B point (base electrode) of the controllable precise voltage-stabilizing source U1(TL431) can be increased through the voltage division principle of the resistors R1 and R2, the cathode of the controllable precise voltage-stabilizing source U1 is in saturated conduction, the FB pin of the power module chip is pulled down, and the power chip does not output a driving signal. At this time, a high level signal does not exist at the point A of the secondary winding of the module, the capacitor C1 cannot be charged through the diode D1, the voltage at two ends of the capacitor C1 can be reduced, the voltage division principle of the voltage-stabilizing diode Z1, the resistor R3 and the resistor R4 can be known, the voltage at the point C can be reduced at this time, because the triode Q1 adopts a PNP triode, according to the working principle of the PNP transistor, the CE electrode of the triode Q1 is conducted at this time, the resistor R7 is connected in parallel between the base electrode and the anode of the controllable precision voltage-stabilizing source U1, the base electrode voltage of the controllable precision voltage-stabilizing source U1 can be reduced, the controllable precision voltage-stabilizing source U1 is prevented from entering a saturated conduction state, the FB pin voltage of the chip of the module is raised. The circuit works continuously in the loop regulation process of the module and is in dynamic balance, so that the module is always in an awakening state, and the over-power protection of the parallel system is prevented from being triggered in the process that the parallel system is unloaded and is fully loaded.
If the power module output is designed with a voltage regulating function, the function of the embodiment is realized by regulating the slide rheostat. The working principle analysis at this time is as follows:
assuming that a product with an output voltage range of 24-32V is designed, when the product is unloaded and the output voltage is 32V, the output voltage of the product needs to be adjusted to 24V, namely, the resistance value of the sliding rheostat needs to be adjusted to be increased. At the moment of increasing the resistance value, according to the voltage division principle of the resistor R1 and the resistor R2, the voltage of the B point (base) of the controllable precise voltage regulator U1(TL431) is increased, so that the cathode of the controllable precise voltage regulator U1 is saturated and turned on, the FB pin voltage of the power module chip is pulled down, because the FB pin voltage is low in no-load output, the module is in a skip cycle mode, and the FB pin voltage is further pulled down, and the power chip does not output a driving signal. At this time, a high level signal does not exist at the point A of the secondary winding of the module, the capacitor C1 cannot be charged through the diode D1, the voltage at two ends of the capacitor C1 can be reduced, the voltage division principle of the voltage-stabilizing diode Z1, the resistor R3 and the resistor R4 shows that the voltage at the point C of the capacitor can be reduced, because the triode Q1 adopts a PNP triode, according to the working principle of the PNP transistor, the CE electrode of the triode Q1 is conducted at this time, the resistor R7 is connected between the base electrode and the anode of the controllable precise voltage-stabilizing source U1 in parallel, the base electrode voltage of the controllable precise voltage-stabilizing source U1 can be reduced, the controllable precise voltage-stabilizing source U1 is prevented from entering a saturated conduction state, the FB pin voltage of the chip of the module is raised again, and. The circuit continuously adjusts in the module output voltage adjusting process, so that the module is always in an awakening state.
When the power module adopting the circuit of the embodiment is used as a backup power supply for supplying power to a back-end system, the main power supply and the backup power supply are used in parallel. The working principle analysis at this time is as follows:
if the output voltage of the main power supply is higher than that of the backup power supply, the backup power supply can be charged by the main power supply and is in a dormant state, when the main power supply stops supplying power, the backup power supply cannot respond in time, so that the whole power supply system stops supplying power, and the back-end system does not output power. When the output end of the backup power supply is added with the circuit, the backup power supply is charged, and the voltage of the B point (base) of the controllable precise voltage-stabilizing source U1(TL431) is increased through the voltage division principle of the resistor R1 and the resistor R2, so that the cathode of the controllable precise voltage-stabilizing source U1 is in saturated conduction, the voltage of the FB pin of the power module chip is pulled down, and the power chip does not output a driving signal. At this time, a high level signal does not exist at the point A of the secondary winding of the module, the capacitor C1 cannot be charged through the diode D1, the voltage at two ends of the capacitor C1 can be reduced, the voltage division principle of the voltage-stabilizing diode Z1, the resistor R3 and the resistor R4 can be known, the voltage at the point C can be reduced at this time, because the triode Q1 adopts a PNP triode, according to the working principle of the PNP transistor, the CE electrode of the triode Q1 is conducted at this time, the resistor R7 is connected in parallel between the base electrode and the anode of the controllable precision voltage-stabilizing source U1, the base electrode voltage of the controllable precision voltage-stabilizing source U1 can be reduced, the controllable precision voltage-stabilizing source U1 is prevented from entering a saturated conduction state, the FB pin voltage of the chip of the module is raised. The circuit continuously works in the loop regulation process of the module and is in dynamic balance, so that the module is always in an awakening state, and the backup power supply can quickly respond to maintain power supply for a back-end system after the main power supply circuit stops supplying power.
In the three application occasions, the resistor R5 is used for adjusting the response speed of the circuit, the capacitor C2 is a filter capacitor, and the resistor R6 plays a role in limiting current.
It should be noted that, the transistor Q1 in the above embodiment may be implemented by a PNP transistor as well as a PMOS transistor, and the working principle is the same, which is not described herein again.
The embodiment of the invention is not limited to the parallel connection of two modules, and the parallel connection of a plurality of modules can be realized. According to the present invention, it is understood that the circuit implementation of the present invention may be modified, replaced or changed in various forms without departing from the basic technical idea of the present invention.
Claims (2)
1. An auxiliary circuit is applied to a switching power supply comprising a controllable precise voltage-stabilizing source U1, wherein the controllable precise voltage-stabilizing source U1 is used for controlling the output voltage and regulating a loop of the switching power supply, and is characterized in that: the auxiliary circuit comprises a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a capacitor C1, a capacitor C2, a diode D1, a zener diode Z1 and a PNP triode Q1; the anode of a diode D1 is connected with the hot end of a secondary winding of a transformer of the power supply module, the cathode of a diode D1 is simultaneously connected with one end of a capacitor C1, one end of a resistor R3 and one end of a resistor R5, the other end of a capacitor C1 and the other end of a resistor R5 are connected with the negative Vo output of the power supply module, the other end of a resistor R3 is connected with the cathode of a zener diode Z1, the anode of the zener diode Z1 is simultaneously connected with one end of a capacitor C2, one end of a resistor R4 and one end of a resistor R6, the other end of the capacitor C2 and the other end of a resistor R4 are connected with the negative Vo output of the power supply module, the other end of the resistor R6 is connected with the base of a triode Q1, the collector of the triode Q1 is connected with the.
2. An auxiliary circuit is applied to a switching power supply comprising a controllable precise voltage-stabilizing source U1, wherein the controllable precise voltage-stabilizing source U1 is used for controlling the output voltage and regulating a loop of the switching power supply, and is characterized in that: the auxiliary circuit comprises a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a capacitor C1, a capacitor C2, a diode D1, a voltage stabilizing diode Z1 and a PMOS tube Q1; the anode of a diode D1 is connected with the hot end of a secondary winding of a transformer of the power supply module, the cathode of a diode D1 is simultaneously connected with one end of a capacitor C1, one end of a resistor R3 and one end of a resistor R5, the other end of a capacitor C1 and the other end of a resistor R5 are connected with the negative Vo output of the power supply module, the other end of a resistor R3 is connected with the cathode of a voltage stabilizing diode Z1, the anode of a voltage stabilizing diode Z1 is simultaneously connected with one end of a capacitor C2, one end of a resistor R4 and one end of a resistor R6, the other end of the capacitor C2 and the other end of a resistor R4 are connected with the negative Vo output of the power supply module, the other end of the resistor R6 is connected with the grid of a PMOS tube Q1, the drain of the PMOS tube Q1 is connected with.
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| CN201911317113.3A CN111026224B (en) | 2019-12-19 | 2019-12-19 | Auxiliary circuit |
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| CN201911317113.3A CN111026224B (en) | 2019-12-19 | 2019-12-19 | Auxiliary circuit |
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| CN111026224A CN111026224A (en) | 2020-04-17 |
| CN111026224B true CN111026224B (en) | 2021-07-13 |
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| CN117460123B (en) * | 2023-12-26 | 2024-03-15 | 深圳莱福德科技股份有限公司 | Method for preventing no-load runaway of LED driving power supply |
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| TW201035711A (en) * | 2009-03-20 | 2010-10-01 | Well Shin Technology Co Ltd | Assistant circuit of power |
| CN103631298B (en) * | 2012-08-28 | 2015-12-16 | 三星半导体(中国)研究开发有限公司 | Linear stable |
| JP5739850B2 (en) * | 2012-09-03 | 2015-06-24 | コーセル株式会社 | Switching power supply |
| CN103036436B (en) * | 2012-11-29 | 2015-07-01 | 无锡市金赛德电子有限公司 | Switching power supply parallel control circuit and method of switching power supply parallel control |
| CN103179764B (en) * | 2013-04-12 | 2016-07-06 | 广州怡泰照明电子科技有限公司 | A kind of LED with self-adaptive driving circuit and self-adaptive driving circuit |
| US20160056724A1 (en) * | 2014-08-21 | 2016-02-25 | Texas Instruments Incorporated | Switching Power Supplies And Methods Of Operating Switching Power Supplies |
| CN204271916U (en) * | 2014-12-11 | 2015-04-15 | 安徽瑞德智能科技有限公司 | A kind of auxiliary power supply circuit of Switching Power Supply |
| CN206442289U (en) * | 2016-12-27 | 2017-08-25 | 深圳市思坎普科技有限公司 | A kind of Switching Power Supply low-power consumption fast start circuit |
| CN107046323A (en) * | 2017-04-18 | 2017-08-15 | 深圳市菲菱科思通信技术股份有限公司 | A kind of power-down protection circuit |
| US10492140B2 (en) * | 2017-05-23 | 2019-11-26 | Verily Life Sciences Llc | Auxiliary path for low-power device wakeup |
| CN207443188U (en) * | 2017-09-04 | 2018-06-01 | 惠阳帝宇工业有限公司 | A kind of emergency light circuit for automatically cutting off charging |
| CN207542990U (en) * | 2017-10-31 | 2018-06-26 | 长沙广义变流技术有限公司 | A kind of soft starting circuit based on TL431 closed-loop controls |
| CN208046210U (en) * | 2018-04-09 | 2018-11-02 | 广州金升阳科技有限公司 | A kind of protection circuit against input over-voltage and the Switching Power Supply comprising the circuit |
| CN209283086U (en) * | 2018-11-30 | 2019-08-20 | 浙江大学台州研究院 | A kind of Switching Power Supply start-up circuit and Switching Power Supply |
| CN209593090U (en) * | 2019-03-21 | 2019-11-05 | 厦门正艾科技有限公司 | A kind of power-down retaining circuit |
| CN110417259A (en) * | 2019-07-19 | 2019-11-05 | 广州金升阳科技有限公司 | A kind of self-switching type voltage regulator |
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