CN203537230U - Capacitor series-connected equalizing circuit - Google Patents
Capacitor series-connected equalizing circuit Download PDFInfo
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- CN203537230U CN203537230U CN201320708426.3U CN201320708426U CN203537230U CN 203537230 U CN203537230 U CN 203537230U CN 201320708426 U CN201320708426 U CN 201320708426U CN 203537230 U CN203537230 U CN 203537230U
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Abstract
The utility model relates to a capacitor series-connected equalizing circuit. The structure of the utility model is that an equalizing circuit is in parallel connection with the two ends of each capacitor, a constant current source and equalizing resistors are in parallel connection with the two ends of each capacitor except a grounding capacitor, and equalizing resistors are in parallel connected with the two ends of the grounding capacitor. The capacitor series-connected equalizing circuit of the utility model overcomes the past defects in an occasion having a wide range of input voltage that if a power supply works on the low-voltage and no-load conditions, the voltages of the capacitors are lower, the discharging currents are smaller, the effects of the equalizing resistors are weakened, and the loads at the two ends of each series-connected capacitor are unbalanced; if an input voltage fluctuates, the voltage division proportion of the series-connected capacitors also changes to generate a power supply fault, etc. The capacitor series-connected equalizing circuit of the utility model enables the power supply to work under a high-voltage and wide-range input, has the simple and reliable equalizing circuits, enables the current values of the constant current sources to be equal to the starting power supply of a driving chip, enables the discharging currents of the capacitors not to change when the input voltage changes, and realizes the balanced voltage division of the series-connected capacitors on the different input and no-load conditions with the combined action of the constant current sources and the equalizing resistors.
Description
Technical field
The utility model relates to a kind of direct-current switch power supply of high pressure wide region input, particularly a kind of capacitances in series equalizer circuit.
Background technology
Before the present utility model, in the Switching Power Supply of high input voltage, in order to facilitate topology design, power device type selecting and design of transformer, generally take capacitances in series dividing potential drop to reduce components and parts stress, the different dividing potential drops that cause of the leakage current of each series capacitance are uneven when preventing zero load simultaneously, common practices is grading resistor in parallel at electric capacity two ends, grading resistor is much smaller than the insulation resistance of electric capacity, make the electric current flowing through on grading resistor much larger than leakage current, the discharging current that is electric capacity is the electric current flowing through on grading resistor substantially, choose same resistance, the discharging current of electric capacity just can keep basically identical, the voltage that each series capacitance is got is basically identical.But, in the occasion of wide-range input voltage, if power work under low pressure no-load condition, capacitance voltage is lower, discharging current is less, the effect of grading resistor will be weakened.In addition, generally, this electric capacity of ground connection is required to be and drives chip that startup power supply is provided, aggravated the situation of the electric capacity two ends laod unbalance of each series connection under no-load condition, and now, if input voltage fluctuation, the dividing potential drop ratio of series capacitance also can change, and makes wherein one or many electric capacity both end voltage surpass its withstand voltage and produce power failure.
Summary of the invention
The utility model is analysed object and is just to overcome above-mentioned defect, develops a kind of capacitances in series equalizer circuit.
The technical solution of the utility model is:
A capacitances in series equalizer circuit, each electric capacity two ends equalizer circuit in parallel, its technical characteristics is the constant-current source in parallel of other electric capacity two ends except ground capacity and grading resistor, ground capacity two ends grading resistor in parallel.
Described constant-current source is comprised of triode, voltage-stabiliser tube and resistance.
Described at electric capacity two ends parallel connection grading resistor, wherein, the grading resistor of ground capacity is connected between the both positive and negative polarity of electric capacity, and the grading resistor of other electric capacity is connected between capacitance cathode and the base stage of constant-current source triode.
The beneficial effects of the utility model have been effectively to realize the balance of capacitances in series dividing potential drop, make power supply be able to the occasion work in the input of high voltage wide region, equalizer circuit is simple and reliable, and constant-current source current value is suitable with driving chip enable power supply, guaranteed that, when input voltage changes, the discharging current of electric capacity is constant; Simultaneously at electric capacity two ends, retain grading resistor, both can facilitate the debugging of capacitance partial pressure balance, can reduce again the impact that the slight variation of startup power supply under standby and normal operation that drive chip causes capacitance partial pressure.Constant-current source and grading resistor acting in conjunction, realized the balance of series capacitance dividing potential drop under difference input, no-load condition.
Other concrete advantages of the present utility model and effect will go on to say below.
Accompanying drawing explanation
Fig. 1---the utility model high-voltage direct current switch power-supply system block diagram.
Fig. 2---the electric capacity schematic diagram in Fig. 1.
Wherein,
Fig. 1 comprises: EMI circuit A, capacitance partial pressure circuit B (comprising equalizer circuit), conversion switch C, feedback circuit D, drive circuit E.
Fig. 2 is the capacitance partial pressure circuit in Fig. 1, comprises bleeder circuit B1, bleeder circuit B2, bleeder circuit B3, and each bleeder circuit comprises electric capacity and equalizer circuit, and equalizer circuit b1, equalizer circuit b2, equalizer circuit b3, drive chip U1.
Embodiment
Technical thought of the present utility model is:
The prime of Switching Power Supply is designed to three road circuit series connection, higher input voltage is divided into three parts, thereby reduced the components and parts stress on each road, basically identical for guaranteeing the voltage of getting on every road, each the electric capacity two ends parallel connection in three road circuit equalizer circuit.
The explanation of concrete structure principle below.
As shown in Figure 1:
Input voltage is through EMI circuit A filtering Hou Bei tri-road capacitance partial pressure circuit B dividing potential drops, be bleeder circuit B1, bleeder circuit B2, bleeder circuit B3, the corresponding Switching Power Supply power supply in the small voltage Wei San road of getting, after three-way switch power supply transformation in again secondary and output together.
As shown in Figure 2:
In No. three bleeder circuits, each electric capacity two ends is in parallel equalizer circuit, i.e. equalizer circuit b1, equalizer circuit b2, equalizer circuit b3, wherein equalizer circuit b1 and equalizer circuit b2 are comprised of grading resistor and constant-current source, and equalizer circuit b3 only has grading resistor.Described constant-current source is comprised of triode, voltage-stabiliser tube and resistance.
The utility model application process is described as follows:
Relatively the electric capacity of No. three bleeder circuits with load can find, the electric capacity of bleeder circuit B3 (being the electric capacity of one end ground connection) is except driving the Switching Power Supply of rear class, also need for driving chip U1 that startup power supply is provided, and the startup power supply of U1 is the constant-current source of a 1.15mA, if equalizer circuit b1, equalizer circuit b2 only adopts grading resistor all to press, even if can guarantee under specified input condition that No. three bleeder circuits divide pressure balanced, but when input voltage changes, the load on three tunnels is with different (the equalizer circuit b1 of change in voltage, equalizer circuit b2 is pure resistance, the electric capacity of bleeder circuit B3 drives the constant-current source of 1.15mA), so can not guarantee three tunnels, divide pressure balanced.
For addressing the above problem, the startup power supply of equalizer circuit b1, equalizer circuit b2 analog-driven chip U1, a 1.15mA constant-current source in parallel.In equalizer circuit b1, constant-current source is comprised of triode Q1, voltage-stabiliser tube D1 and resistance R 11～R12, and D1 is the base voltage U of Q1
bbe stabilized in 9.1V, Q1 Base-Emitter two ends pressure drop U
befor 0.7V, the electric current that therefore flows through triode Q1 collector electrode is I
c=(U
b-U
be)/(R11+R12)=(9.1-0.7)/(3.6+3.6)=1.17mA, the driving power of chip U1 is suitable with driving.Equalizer circuit b2 and equalizer circuit b1 adopt same scheme, guarantee that the load of three road electric capacity is consistent.Now, when input voltage changes, electric capacity is by constant-current source or drive the discharging current of chip can not change.
Simultaneously at electric capacity two ends, retain grading resistor, both can facilitate the debugging of capacitance partial pressure balance, can reduce again the impact that the slight variation of startup power supply under standby and normal operation that drive chip causes capacitance partial pressure.Wherein, in equalizer circuit b3, grading resistor is connected between electric capacity both positive and negative polarity, in equalizer circuit b1, equalizer circuit b2, grading resistor has been connected between capacitance cathode and the base stage of constant-current source triode, the existing all pressures of the grading resistor effect of equalizer circuit b1, equalizer circuit b2, for triode provides base current, make it be operated in amplification region again, and provide power supply for voltage-stabiliser tube.
Constant-current source and grading resistor acting in conjunction, guarantee that the load of three road electric capacity is consistent, realized all pressures of series capacitance under difference input, no-load condition, makes power supply be able to the occasion work in the input of high pressure wide region.
Driving chip U1 model is LD7560.
Claims (3)
1. a capacitances in series equalizer circuit, each electric capacity two ends equalizer circuit in parallel, is characterized in that other electric capacity two ends constant-current source in parallel and grading resistors except ground capacity, ground capacity two ends grading resistor in parallel.
2. a kind of capacitances in series equalizer circuit according to claim 1, is characterized in that described constant-current source is comprised of triode, voltage-stabiliser tube and resistance.
3. a kind of capacitances in series equalizer circuit according to claim 1, it is characterized in that the grading resistor in parallel at electric capacity two ends, wherein, the grading resistor of ground capacity is connected between the both positive and negative polarity of electric capacity, and the grading resistor of other electric capacity is connected between capacitance cathode and the base stage of constant-current source triode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320708426.3U CN203537230U (en) | 2013-11-08 | 2013-11-08 | Capacitor series-connected equalizing circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320708426.3U CN203537230U (en) | 2013-11-08 | 2013-11-08 | Capacitor series-connected equalizing circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203537230U true CN203537230U (en) | 2014-04-09 |
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ID=50423401
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320708426.3U Expired - Fee Related CN203537230U (en) | 2013-11-08 | 2013-11-08 | Capacitor series-connected equalizing circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203537230U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107453607A (en) * | 2017-07-28 | 2017-12-08 | 浙江大学 | A kind of submarine observation network constant-current supply system based on linear power balancer |
| CN107707111A (en) * | 2017-11-24 | 2018-02-16 | 威创集团股份有限公司 | A kind of capacitor voltage equalizing circuit and circuit |
| CN110912389A (en) * | 2019-12-11 | 2020-03-24 | 阳光电源股份有限公司 | Voltage-sharing discharge circuit with multiple capacitor series branches and control method thereof |
-
2013
- 2013-11-08 CN CN201320708426.3U patent/CN203537230U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107453607A (en) * | 2017-07-28 | 2017-12-08 | 浙江大学 | A kind of submarine observation network constant-current supply system based on linear power balancer |
| CN107707111A (en) * | 2017-11-24 | 2018-02-16 | 威创集团股份有限公司 | A kind of capacitor voltage equalizing circuit and circuit |
| CN110912389A (en) * | 2019-12-11 | 2020-03-24 | 阳光电源股份有限公司 | Voltage-sharing discharge circuit with multiple capacitor series branches and control method thereof |
| CN110912389B (en) * | 2019-12-11 | 2021-02-12 | 阳光电源股份有限公司 | Voltage-sharing discharge circuit with multiple capacitor series branches and control method thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140409 Termination date: 20161108 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |