CN203788153U - Over-power compensation circuit of flyback power supply - Google Patents
Over-power compensation circuit of flyback power supply Download PDFInfo
- Publication number
- CN203788153U CN203788153U CN201420153135.7U CN201420153135U CN203788153U CN 203788153 U CN203788153 U CN 203788153U CN 201420153135 U CN201420153135 U CN 201420153135U CN 203788153 U CN203788153 U CN 203788153U
- Authority
- CN
- China
- Prior art keywords
- power supply
- power
- resistance
- winding
- electrolytic capacitor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 238000004804 winding Methods 0.000 claims abstract description 42
- 239000003990 capacitor Substances 0.000 claims abstract description 25
- 238000001514 detection method Methods 0.000 abstract description 5
- 230000007423 decrease Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
Landscapes
- Dc-Dc Converters (AREA)
Abstract
The utility model discloses an over-power compensation circuit of a flyback power supply. The over-power compensation circuit comprises a primary side current detection resistor, a power compensation resistor, a rectifier diode, a filter electrolytic capacitor, a pulse width modulation controller and an auxiliary power supply winding. The over-power protection detection end of the pulse width modulation controller is respectively connected with the primary side current detection resistor and the power compensation resistor. The power supply input end of the pulse width modulation controller is respectively connected with the same name end of the auxiliary power supply winding and the positive pole of the filter electrolytic capacitor. A first port of the power compensation resistor is connected with the over-power protection detection end of the modulation controller. The second port is respectively connected with the non same name end of the auxiliary power supply winding and the negative pole of the rectifier diode. The positive pole of the rectifier diode is connected with the negative pole of the filter electrolytic capacitor. The negative pole of the filter electrolytic capacitor is connected with the signal ground. According to the technical scheme of the utility model, the problem of imbalance output power in a wide input voltage range can be solved; and the power loss and the production cost can be reduced.
Description
Technical field
The utility model relates to electronic circuit technology field, relates in particular to a kind of Overpower compensating circuit of flyback power supply.
Background technology
In field of power supplies, for flyback power supply, in wide input voltage range, the input voltage after rectification there will be the situation of high voltage or low-voltage, at this moment can cause the unbalanced situation of power output.Prior art adopts power supply chip built-in high-low power compensating circuit, or bus after AC rectification arranges a power back-off resistance and be linked into the overpower protection test side of power supply chip, realizes the compensation of power output.
But power back-off resistance is connected on high direct voltage bus, and in the time of high input voltage, loss is larger, day by day pursuing high efficiency, in the situation of low standby, and be not suitable for using.And power back-off resistance is withstand voltage higher, needs many Chip-Rs series connection to use and could meet voltage stress requirement.
Summary of the invention
In order to solve above technical problem, the utility model provides a kind of Overpower compensating circuit of flyback power supply, can not only solve in wide input voltage range, and power output imbalance problem, and can reduce power loss and production cost.
The utility model embodiment provides a kind of Overpower compensating circuit of flyback power supply, comprising: primary current detects resistance, power back-off resistance, rectifier diode, electrolytic capacitor filter, PDM keyer and auxiliary power supply winding; Wherein, resistance is detected with primary current respectively in the overpower protection test side of PDM keyer, power back-off resistance is connected, and the power input of PDM keyer is connected with the Same Name of Ends of described auxiliary power supply winding, the positive pole of electrolytic capacitor filter respectively; The overpower protection test side of modulation controller connects, and the second port is connected with the non-same polarity of described auxiliary power supply winding, the positive pole of rectifier diode respectively; The negative pole of described rectification diode is connected with the negative pole of described electrolytic capacitor filter; The negative pole of described electrolytic capacitor filter is connected with signal ground.
Further, described Overpower compensating circuit also comprises: former limit switching tube, described former limit switching tube detects resistance with primary current and is connected.
Further, described Overpower compensating circuit also comprises: former limit winding and input electrochemical capacitor, and the Same Name of Ends of described former limit winding is connected with former limit switching tube, and the non-same polarity of described former limit winding is connected with input electrochemical capacitor.
Further, described Overpower compensating circuit also comprises: semifixed resistor, described semifixed resistor is connected between the power input of described PDM keyer and the Same Name of Ends of described auxiliary power supply winding.
Therefore; the Overpower compensating circuit that the utility model embodiment provides; in the time of flyback power work, primary current detects the input voltage of the former limit of resistance detection winding, and primary current detects resistance and power back-off resistance is linked into respectively on the overpower protection test side of PDM keyer.The positive pole of rectification diode is connected with power back-off resistance, and the negative pole of rectifier diode is connected with the negative pole of electrolytic capacitor filter.On overpower protection test side due to PDM keyer, be provided with corresponding fiducial value, if higher than this fiducial value, PDM keyer can be closed automatically, thereby realizes protection.In the time that input voltage is high voltage; the voltage of auxiliary power supply winding also increases thereupon; the pressure drop that primary current detects resistance diminishes; at this moment,, due to the Opposite direction connection of rectification diode, the pressure drop of power back-off resistance is increased; the voltage of this overpower protection test side detects the pressure drop of resistance by primary current and the pressure drop of power back-off resistance determines jointly; by the voltage compensation of two resistance, thereby stablize the voltage of overpower protection test side, realize power back-off and stable power output.In the time that input voltage is low-voltage; the voltage decreases of radiation type electric supply winding; the pressure drop that primary current detects resistance increases; at this moment; the Opposite direction connection of rectifier diode diminishes the pressure drop of power back-off resistance; thereby stablize the voltage of overpower protection test side, realized power back-off and stable power output.
Visible, than in prior art in flyback power supply chip built-in power compensating circuit and power back-off resistance is linked into the technical scheme of bus, adopt technical solutions of the utility model can solve the unbalanced problem of power output, and energy power consumption is lower, the resistance of power back-off resistance is adjustable, can use the power back-off resistance of smaller amounts, thereby reduce costs.
Brief description of the drawings
Fig. 1 is the syndeton schematic diagram of the power compensating circuit of a kind of flyback power supply of providing of the utility model.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the utility model embodiment is clearly and completely described.
Referring to Fig. 1, it is the syndeton schematic diagram of the power compensating circuit of a kind of flyback power supply of providing of the utility model.This power compensating circuit mainly comprises: primary current detects resistance R 3, power back-off resistance R 2, rectifier diode D1, electrolytic capacitor filter EC2, PDM keyer UB101 and auxiliary power supply winding N2.
Wherein, the overpower protection test side CS of PDM keyer UB101 detects resistance R 3 with primary current respectively, power back-off resistance R 2 is connected, and the power input VCC of PDM keyer UB101 is connected with the Same Name of Ends of auxiliary power supply winding N2, the positive pole of electrolytic capacitor filter EC2 respectively.The first port of power back-off resistance R 2 is connected with the overpower protection test side CS of PDM keyer UB101, and the second port is connected with the non-same polarity of auxiliary power supply winding N2, the negative pole of rectifier diode D1 respectively.The positive pole of rectification diode D1 is connected with the negative pole of electrolytic capacitor filter EC2.The negative pole of electrolytic capacitor filter EC2 is connected with signal ground.
In the present embodiment, Overpower compensating circuit also comprises former limit switching tube Q1, and this former limit switching tube Q1 detects resistance R 3 with primary current respectively, former limit winding N1 is connected.
In the present embodiment, Overpower compensating circuit also comprises former limit winding N1 and N6 and input electrochemical capacitor EC1.The Same Name of Ends of former limit winding N1 and N6 is connected with former limit switching tube, and its non-same polarity is connected with input electrochemical capacitor EC1.Former limit winding N1 and N6 are magnet winding, can be, but not limited to adopt other winding to replace.
In the present embodiment, Overpower compensating circuit also comprises: semifixed resistor R1, this semifixed resistor R1 is connected between the power input VCC of PDM keyer UB101 and the Same Name of Ends of auxiliary power supply winding N2, the voltage of adjustable VCC end.
In the present embodiment, this structural representation also comprises: output winding N3, output rectifier diode D2 and output electrochemical capacitor EC3.This components and parts composition output circuit, with a flyback power supply of power compensating circuit composition of the present utility model, its concrete connection can be adjusted according to actual conditions.This output circuit can be, but not limited to adopt other circuit to replace.
In the present embodiment, in the time that former limit switching tube Q1 opens, voltage on transformer is upper just lower negative (being that on winding, this white circle place is negative), and direct voltage on bus is added on former limit winding N1 and N6, former limit winding N1 and N6 stored energy, and voltage on auxiliary power supply winding N2 is also upper just lower negative (be on winding this circled for negative), the cut-off of rectifier diode D1 reverse bias, reverse voltage and busbar voltage on diode are proportional, can calculate the voltage on auxiliary power supply winding N2: V_N2=V_EC1* (N1+N6)/N2 by following formula, the wherein N1 in formula, the wire circle of respectively corresponding its winding of N2 and N6.This voltage will be followed bus direct voltage; and access the overpower protection test side (CS) of PDM keyer by power back-off resistance R 2; V_N2 is by the resitstance voltage divider dividing potential drop of R2 and R3 composition; and superpose with the current signal on former limit; send into the comparator in control chip, to realize power back-off.
Specific implementation principle is as follows, in the time that input voltage is high voltage, the voltage of auxiliary power supply winding N2 also increases thereupon, the pressure drop V_R3 that primary current detects resistance R 3 diminishes, at this moment, due to the Opposite direction connection of rectification diode D1, the pressure drop V_R2 of power back-off resistance R 2 is increased, the voltage of this overpower protection test side CS detects the pressure drop of resistance R 3 by primary current and the pressure drop of power back-off resistance R 2 determines jointly, by the voltage compensation of resistance R 2 and R3, the voltage of finally sending into CS end is V_CS=V_R2+V_R3, thereby stablize the voltage of overpower protection test side CS, realize power back-off and stable power output.In the time that input voltage is low-voltage; the voltage decreases of radiation type electric supply winding N2; the pressure drop V_R3 that primary current detects resistance R 3 increases; at this moment; the Opposite direction connection of rectifier diode D1 diminishes the pressure drop V_R2 of power back-off resistance R 2; the voltage of finally sending into CS end is V_CS=V_R2+V_R3, thereby has stablized the voltage of overpower protection test side CS, realizes power back-off and stable power output.
In the present embodiment, can be with the voltage ratio of adjusting primary current and detect resistance R 3 and power back-off resistance R 2, the power-balance when realizing high low-voltage.
In the present embodiment, rectifier diode D1 is connected between the non-same polarity of auxiliary power supply winding N2 and the negative pole of electrolytic capacitor filter EC2 (being ground, former limit).Only have this connection, the reverse voltage of auxiliary power supply winding N2 proportional to DC bus-bar voltage is taken out, access the overpower protection test side CS of PDM keyer UB101 by power back-off resistance R 2, realize the power back-off of high-low pressure input.
Visible, than in prior art in flyback power supply chip built-in power compensating circuit and power back-off resistance is linked into the technical scheme of bus, adopt technical solutions of the utility model can solve the unbalanced problem of power output, and energy power consumption is lower, the resistance of power back-off resistance is adjustable, can use the power back-off resistance of smaller amounts, thereby reduce costs.
The above is preferred implementation of the present utility model; it should be pointed out that for those skilled in the art, do not departing under the prerequisite of the utility model principle; can also make some improvements and modifications, these improvements and modifications are also considered as protection range of the present utility model.
Claims (4)
1. an Overpower compensating circuit for flyback power supply, is characterized in that, comprising: primary current detects resistance, power back-off resistance, rectifier diode, electrolytic capacitor filter, PDM keyer and auxiliary power supply winding;
Wherein, resistance is detected with primary current respectively in the overpower protection test side of PDM keyer, power back-off resistance is connected, and the power input of PDM keyer is connected with the Same Name of Ends of described auxiliary power supply winding, the positive pole of electrolytic capacitor filter respectively;
The first port of described power back-off resistance is connected with the overpower protection test side of described PDM keyer, and the second port is connected with the non-same polarity of described auxiliary power supply winding, the negative pole of rectifier diode respectively;
The positive pole of described rectification diode is connected with the negative pole of described electrolytic capacitor filter;
The negative pole of described electrolytic capacitor filter is connected with signal ground.
2. Overpower compensating circuit according to claim 1, is characterized in that, also comprises: former limit switching tube, described former limit switching tube detects resistance with primary current and is connected.
3. Overpower compensating circuit according to claim 2, is characterized in that, also comprises: former limit winding and input electrochemical capacitor, and the Same Name of Ends of described former limit winding is connected with former limit switching tube, and the non-same polarity of described former limit winding is connected with input electrochemical capacitor.
4. according to the arbitrary described Overpower compensating circuit of claims 1 to 3, it is characterized in that, also comprise: semifixed resistor, described semifixed resistor is connected between the power input of described PDM keyer and the Same Name of Ends of described auxiliary power supply winding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420153135.7U CN203788153U (en) | 2014-03-31 | 2014-03-31 | Over-power compensation circuit of flyback power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420153135.7U CN203788153U (en) | 2014-03-31 | 2014-03-31 | Over-power compensation circuit of flyback power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203788153U true CN203788153U (en) | 2014-08-20 |
Family
ID=51324304
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420153135.7U Expired - Lifetime CN203788153U (en) | 2014-03-31 | 2014-03-31 | Over-power compensation circuit of flyback power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203788153U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104795983A (en) * | 2015-05-13 | 2015-07-22 | 成都启臣微电子有限公司 | Over-power compensation circuit for wide voltage power supply, control system and power supply |
| CN106230045A (en) * | 2016-07-28 | 2016-12-14 | 北京空间飞行器总体设计部 | A kind of based on the two-way active equalization circuit synchronizing flyback DC/DC changer |
| WO2019113784A1 (en) * | 2017-12-12 | 2019-06-20 | Astec International Limited | Resonant converters power supplies and control methods for reducing unbalanced currents in resonant converter power supplies |
| CN110379677A (en) * | 2018-04-12 | 2019-10-25 | 深圳南云微电子有限公司 | A kind of auxiliary power supply circuit and the contactor using the circuit |
-
2014
- 2014-03-31 CN CN201420153135.7U patent/CN203788153U/en not_active Expired - Lifetime
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104795983A (en) * | 2015-05-13 | 2015-07-22 | 成都启臣微电子有限公司 | Over-power compensation circuit for wide voltage power supply, control system and power supply |
| CN104795983B (en) * | 2015-05-13 | 2017-08-25 | 成都启臣微电子股份有限公司 | Overpower compensating circuit, control system and power supply for Width funtion power supply |
| CN106230045A (en) * | 2016-07-28 | 2016-12-14 | 北京空间飞行器总体设计部 | A kind of based on the two-way active equalization circuit synchronizing flyback DC/DC changer |
| WO2019113784A1 (en) * | 2017-12-12 | 2019-06-20 | Astec International Limited | Resonant converters power supplies and control methods for reducing unbalanced currents in resonant converter power supplies |
| CN110168895A (en) * | 2017-12-12 | 2019-08-23 | 雅达电子国际有限公司 | Resonant converter power supplies and control method for reducing the out-of-balance current in resonant converter power supplies |
| US10886855B2 (en) | 2017-12-12 | 2021-01-05 | Astec International Limited | Resonant converters power supplies and control methods for reducing unbalanced currents in resonant converter power supplies |
| CN110168895B (en) * | 2017-12-12 | 2024-04-05 | 雅达电子国际有限公司 | Resonant converter power supply and method for reducing unbalanced current therein |
| CN110379677A (en) * | 2018-04-12 | 2019-10-25 | 深圳南云微电子有限公司 | A kind of auxiliary power supply circuit and the contactor using the circuit |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101783595B (en) | Overpower compensating method and device for wide voltage-input flyback power supply | |
| CN203562832U (en) | A power supply for seamlessly switching multiple power supply modules | |
| CN203026904U (en) | Over-current protection circuit and PFC (power factor correction) control circuit with same | |
| CN103475086A (en) | Power source capable of achieving seamless switching of multiple power supply modules | |
| CN203788153U (en) | Over-power compensation circuit of flyback power supply | |
| CN104184111B (en) | Overvoltage protection circuit for high-voltage transmission line ground wire power getting | |
| CN205319941U (en) | Double - circuit voltage conversion control chip , double - circuit voltage conversion ware and electronic electric energy meter | |
| CN201608638U (en) | Fly-back power supply overpower compensation device inputted by wide voltage | |
| CN204761752U (en) | Low -voltage building site LED light drive power supply | |
| CN206673569U (en) | The output protection circuit of Switching Power Supply | |
| CN102781147B (en) | LED (Light-emitting diode) power supply circuit with high power factor | |
| CN202043053U (en) | Switching power supply with under-voltage protection function | |
| CN203660879U (en) | Constant current/constant voltage converter based on PWM modulation | |
| CN202841608U (en) | LED power supply circuit possessing high power factor | |
| CN202395667U (en) | Switch power supply circuit with small voltage output ripple | |
| CN202503439U (en) | Capacitance-resistance voltage reduction circuit of low power supply | |
| CN204316323U (en) | A kind of SS (soft start) control circuit | |
| CN204013258U (en) | Double-sided screen is optimized power supply and double-sided screen system | |
| CN102983736A (en) | AC-DC switch power source having power factor correcting function | |
| CN203014706U (en) | Power supply device with high efficiency alternating current and direct current same port input for cameras | |
| CN202135070U (en) | Dual-voltage capacitance-resistance voltage-reduction energy saving circuit | |
| CN104617790A (en) | Isolating voltage stabilizing circuit and control method thereof | |
| CN204649939U (en) | A kind of power supply electronic load | |
| CN203607825U (en) | Protection circuit, power board and television | |
| CN204349801U (en) | Switching power circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140820 |