CN204089583U - A kind of low-power high-voltage Switching Power Supply start-up circuit - Google Patents
A kind of low-power high-voltage Switching Power Supply start-up circuit Download PDFInfo
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- CN204089583U CN204089583U CN201420639620.5U CN201420639620U CN204089583U CN 204089583 U CN204089583 U CN 204089583U CN 201420639620 U CN201420639620 U CN 201420639620U CN 204089583 U CN204089583 U CN 204089583U
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Abstract
A kind of low-power high-voltage Switching Power Supply start-up circuit, bootstrap startup circuit comprises partial pressure filter circuit and the 3rd start-up capacitance of series connection, partial pressure filter circuit comprises the first filter capacitor, second filter capacitor, first starts grading resistor, second starts grading resistor, one end of first filter capacitor is connected with the first DC output end of single phase bridge type rectifier circu, the other end of the first filter capacitor is connected with one end of the second filter capacitor, the other end of the second filter capacitor is connected to ground, first starts the two ends that grading resistor is connected in parallel on the first filter capacitor, second one end starting grading resistor is connected with the mid point of the first filter capacitor and the second filter capacitor, second starts the other end of grading resistor is connected with the power end of PWM chip.By starting resistance and grading resistor two-way Bing Wei mono-tunnel, decrease resistance quantity, simplify circuit, reduce the power of resistance consumption, reduce energy consumption.
Description
Technical field
The utility model belongs to switch power technology field, relates to a kind of low-power high-voltage Switching Power Supply start-up circuit.
Background technology
As shown in Figure 1, after powering on, electric capacity C2's circuit theory diagrams of existing Switching Power Supply start-up circuit first embodiment is charged by starting resistance R1, and reach the enabling gate of PWM chip B in limited time, PWM chip B works.Electric capacity C2 provides circuit and switching tube institute energy requirement, until main circuit working stability, now auxiliary winding Ns is by rectifier diode D2 energy supply.When the feature of this start-up circuit is input voltage height, on starting resistance R1, power loss is large.
The circuit theory diagrams of existing Switching Power Supply start-up circuit second embodiment as shown in Figure 2, normal need of work auxiliary switching power supply of a lot of instrument and equipment, for each system function module in its inside provides galvanic current, when power supply is the three-phase three-wire system not having center line, require that Switching Power Supply works under 380Vac initial conditions, voltage now after rectifying and wave-filtering will reach 530Vdc, and the highest withstand voltage 450V of electrochemical capacitor, can only adopt and two electrochemical capacitor series connection are used and obtains high withstand voltage, as C1, C2 electric capacity in Fig. 2.But because the leakage current (leak resistance) of each capacitor exists difference, breakdown accident can be produced when unbalanced-voltage-division is serious when causing series connection, realize the balance of voltage, as R1, R2 resistance in Fig. 2 therefore must to during capacitor series connection each capacitor grading resistor in parallel.But due to the value using grading resistor must consider the leakage current of electric capacity, so generally select voltage sharing resistance value with the standard of leakage current under worst case, cause resistance consumption power larger.
Summary of the invention
The utility model, in order to overcome the defect of prior art, devises a kind of low-power high-voltage Switching Power Supply start-up circuit, by starting resistance and grading resistor two-way Bing Wei mono-tunnel, decrease resistance quantity, simplify circuit, reduce the power of resistance consumption, reduce energy consumption.
The concrete technical scheme that the utility model adopts is: a kind of low-power high-voltage Switching Power Supply start-up circuit, comprise single phase bridge type rectifier circu, bootstrap startup circuit, PWM chip, auxiliary winding, first ac input end of single phase bridge type rectifier circu is connected with the first live wire end of three-phase electricity, second ac input end of single phase bridge type rectifier circu is connected with the second live wire end of three-phase electricity, first DC output end of single phase bridge type rectifier circu is connected with bootstrap startup circuit, second DC output end of single phase bridge type rectifier circu is connected to ground, bootstrap startup circuit comprises partial pressure filter circuit and the 3rd start-up capacitance of series connection, one end of 3rd start-up capacitance is connected with the power end of PWM chip, the other end of the 3rd start-up capacitance is connected to ground, be connected with the power end of PWM chip after one end series rectifier diode of auxiliary winding, the other end of auxiliary winding is connected to ground, the positive pole of rectifier diode and auxiliary winding switching, the negative pole of rectifier diode is connected with the power end of PWM chip, key is: described partial pressure filter circuit comprises the first filter capacitor, second filter capacitor, first starts grading resistor, second starts grading resistor, one end of first filter capacitor is connected with the first DC output end of single phase bridge type rectifier circu, the other end of the first filter capacitor is connected with one end of the second filter capacitor, the other end of the second filter capacitor is connected to ground, first starts the two ends that grading resistor is connected in parallel on the first filter capacitor, second one end starting grading resistor is connected with the mid point of the first filter capacitor and the second filter capacitor, second starts the other end of grading resistor is connected with the power end of PWM chip.
Described first starts grading resistor is formed by connecting by the first resistance, the second resistance, the 3rd resistance, the 4th resistant series.
The resistance of the first described resistance, the second resistance, the 3rd resistance, the 4th resistance is respectively 200K Ω, 200K Ω, 200K Ω, 120K Ω.
Described second starts grading resistor is formed by connecting by the 5th resistance, the 6th resistance, the 7th resistance, the 8th resistant series.
The resistance of the 5th described resistance, the 6th resistance, the 7th resistance, the 8th resistance is respectively 200K Ω, 200K Ω, 200K Ω, 80K Ω.
The first described filter capacitor and the capacity of the second filter capacitor are all 82 μ F, and withstand voltage is all 400V, and the capacity of the 3rd start-up capacitance is 22 μ F, and withstand voltage is 50V.
The model of described PWM chip is OB2263.
The beneficial effects of the utility model are: by starting resistance and grading resistor two-way Bing Wei mono-tunnel, decrease resistance quantity, simplify circuit, first startup grading resistor is in parallel with the first filter capacitor, second equivalent internal resistance started when grading resistor works with PWM chip is in parallel with the second filter capacitor after connecting, the voltage on the first filter capacitor and the second filter capacitor can be made impartial by selecting the first suitable resistance starting grading resistor and the second startup grading resistor, and be satisfied with the 3rd start-up capacitance charging after powering on and reach the time requirement of the startup thresholding of PWM chip, reduce the power of resistance consumption, reduce energy consumption.
Accompanying drawing explanation
Fig. 1 is the circuit theory diagrams of existing Switching Power Supply start-up circuit first embodiment.
Fig. 2 is the circuit theory diagrams of existing Switching Power Supply start-up circuit second embodiment.
The circuit theory diagrams of Fig. 3 the utility model breaker in middle power starting circuit.
The circuit diagram of Fig. 4 the utility model breaker in middle power starting circuit when embody rule.
In Fig. 1, D1 represents single phase bridge type rectifier circu, and C1, C2 represent electric capacity, and R1 represents starting resistance, and the auxiliary winding of Ns representative, D2 represents rectifier diode, and B represents PWM chip, and Vcc represents power end.
In Fig. 2, L1 represents the first live wire end, and L2 represents the second live wire end, and D1 represents single phase bridge type rectifier circu, C1, C2, C3 represent electric capacity, and RA, RB represent grading resistor, and RC represents starting resistance, the auxiliary winding of Ns representative, D2 represents rectifier diode, and B represents PWM chip, and Vcc represents power end.
Fig. 3, in Fig. 4, L1 represents the first live wire end, L2 represents the second live wire end, D1 represents single phase bridge type rectifier circu, C1 represents the first filter capacitor, C2 represents the second filter capacitor, C3 represents the 3rd start-up capacitance, RA represents the first startup grading resistor, RB second starts grading resistor, R1 represents the first resistance, R2 represents the second resistance, R3 represents the 3rd resistance, R4 represents the 4th resistance, R5 represents the 5th resistance, R6 represents the 6th resistance, R7 represents the 7th resistance, R8 represents the 8th resistance, the auxiliary winding of Ns representative, D2 represents rectifier diode, B represents PWM chip, Vcc represents power end.
Embodiment
A kind of low-power high-voltage Switching Power Supply start-up circuit, comprise single phase bridge type rectifier circu D1, bootstrap startup circuit, PWM chip B, auxiliary winding Ns, first ac input end of single phase bridge type rectifier circu D1 is connected with the first live wire end L1 of three-phase electricity, second ac input end of single phase bridge type rectifier circu D1 is connected with the second live wire end L2 of three-phase electricity, first DC output end of single phase bridge type rectifier circu D1 is connected with bootstrap startup circuit, second DC output end of single phase bridge type rectifier circu D1 is connected to ground, bootstrap startup circuit comprises partial pressure filter circuit and the 3rd start-up capacitance C3 of series connection, one end of 3rd start-up capacitance C3 is connected with the power end Vcc of PWM chip B, the other end of the 3rd start-up capacitance C3 is connected to ground, be connected with the power end Vcc of PWM chip B after one end series rectifier diode D2 of auxiliary winding Ns, the other end of auxiliary winding Ns is connected to ground, the positive pole of rectifier diode D2 is connected with auxiliary winding Ns, the negative pole of rectifier diode D2 is connected with the power end Vcc of PWM chip B, key is: described partial pressure filter circuit comprises the first filter capacitor C1, second filter capacitor C2, first starts grading resistor RA, second starts grading resistor RB, one end of first filter capacitor C1 is connected with first DC output end of single phase bridge type rectifier circu D1, the other end of the first filter capacitor C1 is connected with one end of the second filter capacitor C2, the other end of the second filter capacitor C2 is connected to ground, first starts the two ends that grading resistor RA is connected in parallel on the first filter capacitor C1, second one end starting grading resistor RB is connected with the mid point of the first filter capacitor C1 and the second filter capacitor C2, second other end starting grading resistor RB is connected with the power end Vcc of PWM chip B.Grading resistor in Fig. 2 and starting resistance are separate two-way resistance, and by two-way Bing Wei mono-tunnel in the utility model, decrease the quantity of resistance, simplify circuit, reduce the power of resistance consumption, reduce energy consumption.
First start grading resistor RA be by resistance be the first resistance R1 of 200K Ω, the resistance second resistance R2 that is 200K Ω, resistance the 3rd resistance R3 that is 200K Ω, resistance be that the 4th resistance R4 of 120K Ω is connected in series, second start grading resistor RB be by resistance be the 5th resistance R5 of 200K Ω, resistance the 6th resistance R6 that is 200K Ω, resistance the 7th resistance R7 that is 200K Ω, resistance be that the 8th resistance R8 of 80K Ω is connected in series.
In actual applications in order to meet the requirement of withstand voltage of resistance, grading resistor and starting resistance are all in series with multiple small-power resistance.Maximumly input 495Vac during the design of this power starting circuit, after rectification be
it is doubly 700V direct voltage, use the resistance (this kind of resistance maximum working voltage 200V) of 1206 encapsulation of six equal resistances, light in the first filter capacitor C1 and the second filter capacitor C2 and respectively use three up and down, i.e. top the first resistance R1, the second resistance R2, the 3rd resistance R3, below with the 5th resistance R5, the 6th resistance R6, the 7th resistance R7.But because resistance lower end does not have ground connection, but connect with the equivalent internal resistance of PWM chip B, so the mid-point voltage of the first filter capacitor C1 and the second filter capacitor C2 can be higher, the resistance respectively increasing by one 1206 encapsulation in practical application is up and down respectively the 4th resistance R4, the 8th resistance R8, and adjust the resistance of the 4th resistance R4, the 8th resistance R8, the resistance of the 4th resistance R4 that top is increased is large, the resistance of the 8th resistance R8 of following increase is little, and then makes the mid-point voltage of the first filter capacitor C1 and the second filter capacitor C2 equal the half of commutating voltage.That is, the 4th resistance R4, the 8th resistance R8 increased for adjusting the mid-point voltage of the first filter capacitor C1 and the second filter capacitor C2 more.After powering on, these eight resistant series charge to the 3rd start-up capacitance C3, make the voltage on the first filter capacitor C1 and the second filter capacitor C2 impartial, and are satisfied with the time requirement that the 3rd start-up capacitance C3 charging reaches the startup thresholding of PWM chip.
The capacity of the first filter capacitor C1 and the second filter capacitor C2 is all 82 μ F, and withstand voltage is all 400V, and the capacity of the 3rd start-up capacitance C3 is 22 μ F, and withstand voltage is 50V.First filter capacitor C1 is relevant with power with the selection of the second filter capacitor C2 capacity, and power is larger, and desired volume is larger, generally designs according to 2 ~ 3uF/W; First filter capacitor C1 and the withstand voltage of the second filter capacitor C2 are related to input power maximum, and 380Vac is rated value, maximumly in design input 495Vac, after rectification are
be doubly 700V direct voltage, so the withstand voltage sum of the first filter capacitor C1 and the second filter capacitor C2 must be greater than 700V.The selection of the 3rd start-up capacitance C3 capacity will meet two conditions: after the first powers on, after voltage on 3rd start-up capacitance C3 reaches the startup thresholding of PWM chip B, chip enable until main circuit working stability (auxiliary winding Ns is by rectifier diode D2 energy supply) during this period of time, the 3rd start-up capacitance electric charge that C3 deposits should enough be powered; It two is large filtering after the 3rd start-up capacitance C3 bears rectifier diode D2 rectification, and capacity also should meet the demands.
Model is selected to be the PWM chip B of OB2263, because PWM chip B has following characteristic: 1. stand-by power consumption is low: whole system not only can be allowed under the state of zero load to reach the up-to-date proposed standard of International Energy Agency easily by special low-power consumption discontinuous operation Model Design, and system can be allowed when comparatively underload (< 1/5load) to have the performance of super low consumption equally; 2. noise-free operation: use the power supply of OB2263 design when unloaded, underloading and fully loaded all can not produce audio-frequency noise, all can undisturbedly work under making any operating state of system; The starting current of 3. lower starting current: OB2263 is low to moderate 3 μ A, effectively can reduce the loss of system start-up circuit, shortens the start-up time of system; The operating current of 4. lower operating current: OB2263 is about 1.4mA, effectively can reduce the loss of system, improves the efficiency of system.
The utility model is in the specific implementation: the voltage recording power end Vcc when PWM chip B normally works is 14V, voltage after rectifying and wave-filtering is 532V, filter capacitor mid-point voltage is 266V, within the withstand voltage scope of electric capacity, this by the mode on starting resistance and grading resistor two-way Bing Wei mono-tunnel, reduce the power of resistance consumption, decrease resistance quantity, simplify circuit, reduce energy consumption.
Claims (7)
1. a low-power high-voltage Switching Power Supply start-up circuit, comprise single phase bridge type rectifier circu (D1), bootstrap startup circuit, PWM chip (B), auxiliary winding (Ns), first ac input end of single phase bridge type rectifier circu (D1) is connected with the first live wire end (L1) of three-phase electricity, second ac input end of single phase bridge type rectifier circu (D1) is connected with the second live wire end (L2) of three-phase electricity, first DC output end of single phase bridge type rectifier circu (D1) is connected with bootstrap startup circuit, second DC output end of single phase bridge type rectifier circu (D1) is connected to ground, bootstrap startup circuit comprises partial pressure filter circuit and the 3rd start-up capacitance (C3) of series connection, one end of 3rd start-up capacitance (C3) is connected with the power end (Vcc) of PWM chip (B), the other end of the 3rd start-up capacitance (C3) is connected to ground, one end series rectifier diode (D2) of auxiliary winding (Ns) is connected with the power end (Vcc) of PWM chip (B) afterwards, the other end of auxiliary winding (Ns) is connected to ground, the positive pole of rectifier diode (D2) is connected with auxiliary winding (Ns), the negative pole of rectifier diode (D2) is connected with the power end (Vcc) of PWM chip (B), it is characterized in that: described partial pressure filter circuit comprises the first filter capacitor (C1), second filter capacitor (C2), first starts grading resistor (RA), second starts grading resistor (RB), one end of first filter capacitor (C1) is connected with the first DC output end of single phase bridge type rectifier circu (D1), the other end of the first filter capacitor (C1) is connected with one end of the second filter capacitor (C2), the other end of the second filter capacitor (C2) is connected to ground, first starts the two ends that grading resistor (RA) is connected in parallel on the first filter capacitor (C1), second one end starting grading resistor (RB) is connected with the mid point of the first filter capacitor (C1) and the second filter capacitor (C2), second other end starting grading resistor (RB) is connected with the power end (Vcc) of PWM chip (B).
2. a kind of low-power high-voltage Switching Power Supply start-up circuit according to claim 1, is characterized in that: described first starts grading resistor (RA) is connected in series by the first resistance (R1), the second resistance (R2), the 3rd resistance (R3), the 4th resistance (R4).
3. a kind of low-power high-voltage Switching Power Supply start-up circuit according to claim 2, is characterized in that: the resistance of described the first resistance (R1), the second resistance (R2), the 3rd resistance (R3), the 4th resistance (R4) is respectively 200K Ω, 200K Ω, 200K Ω, 120K Ω.
4. a kind of low-power high-voltage Switching Power Supply start-up circuit according to claim 1, is characterized in that: described second starts grading resistor (RB) is connected in series by the 5th resistance (R5), the 6th resistance (R6), the 7th resistance (R7), the 8th resistance (R8).
5. a kind of low-power high-voltage Switching Power Supply start-up circuit according to claim 4, is characterized in that: the resistance of the 5th described resistance (R5), the 6th resistance (R6), the 7th resistance (R7), the 8th resistance (R8) is respectively 200K Ω, 200K Ω, 200K Ω, 80K Ω.
6. a kind of low-power high-voltage Switching Power Supply start-up circuit according to claim 1, it is characterized in that: described the first filter capacitor (C1) and the capacity of the second filter capacitor (C2) are all 82 μ F, withstand voltage is all 400V, the capacity of the 3rd start-up capacitance (C3) is 22 μ F, and withstand voltage is 50V.
7. a kind of low-power high-voltage Switching Power Supply start-up circuit according to claim 1, is characterized in that: the model of described PWM chip (B) is OB2263.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420639620.5U CN204089583U (en) | 2014-10-30 | 2014-10-30 | A kind of low-power high-voltage Switching Power Supply start-up circuit |
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| CN201420639620.5U CN204089583U (en) | 2014-10-30 | 2014-10-30 | A kind of low-power high-voltage Switching Power Supply start-up circuit |
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| CN204089583U true CN204089583U (en) | 2015-01-07 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106998149A (en) * | 2017-05-23 | 2017-08-01 | 湖南晟和电子技术有限公司 | Power circuit, method of supplying power to and its measuring instrument being made |
| CN113644818A (en) * | 2021-08-12 | 2021-11-12 | 深圳信息职业技术学院 | High-voltage starting circuit |
| CN113922655A (en) * | 2021-10-18 | 2022-01-11 | 无锡市欧瑞杰电子科技有限公司 | PWM chip starts and loses electric warning circuit and switching power supply |
-
2014
- 2014-10-30 CN CN201420639620.5U patent/CN204089583U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106998149A (en) * | 2017-05-23 | 2017-08-01 | 湖南晟和电子技术有限公司 | Power circuit, method of supplying power to and its measuring instrument being made |
| CN113644818A (en) * | 2021-08-12 | 2021-11-12 | 深圳信息职业技术学院 | High-voltage starting circuit |
| CN113922655A (en) * | 2021-10-18 | 2022-01-11 | 无锡市欧瑞杰电子科技有限公司 | PWM chip starts and loses electric warning circuit and switching power supply |
| CN113922655B (en) * | 2021-10-18 | 2024-02-20 | 无锡市欧瑞杰电子科技有限公司 | PWM chip starting and power-off alarm circuit and switching power supply |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150107 Termination date: 20171030 |
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| CF01 | Termination of patent right due to non-payment of annual fee |