CN205304630U - Series resonance step -down converting circuit - Google Patents
Series resonance step -down converting circuit Download PDFInfo
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- CN205304630U CN205304630U CN201620064746.3U CN201620064746U CN205304630U CN 205304630 U CN205304630 U CN 205304630U CN 201620064746 U CN201620064746 U CN 201620064746U CN 205304630 U CN205304630 U CN 205304630U
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Abstract
The utility model discloses a series resonance step -down converting circuit, the circuit includes: two inputs that are used for connecting the high -voltage pulse source, a low pressure direct current output anode, a low pressure direct current output negative terminal, low pressure direct current output negative terminal is connected with one of them input, wherein, the inductance L1 that puts in series between two inputs, first electric capacity C1 and first diode D1, wherein, first diode D1's positive pole and direct current output negative terminal are connected, inductance L1, one end and an input of first electric capacity C1's current circuit are connected, inductance L1, first electric capacity C1's current circuit's the other end and first diode D1's negative pole are connected, first diode D1's negative pole and second diode D2's positive pole are connected, second diode D2's negative pole and low pressure direct current output anode and second electric capacity C2's one end are connected, second electric capacity C2's the other end and low pressure direct current output negative terminal are connected.
Description
Technical field
The utility model relates to circuit field, in particular to a kind of series resonance decompression converting circuit.
Background technology
Supply convertor realize except basic power conversion functional circuit elements except having, the circuit element of other controlling functions may be realized in addition, the operating voltage scope of these pilot circuit elements is restricted, when service voltage is low, pilot circuit element can not open work, during service voltage height, it is possible to exceed the most high working voltage of element and damage. Ways of addressing this issue generally has these several:
The first is the auxiliary electric power supply increasing an independent isolation in supply convertor, it is provided that stable voltage gives above-mentioned pilot circuit power elements so that supply convertor more complicated, and element increases, cost increase, occurs the possibility of fault to improve.
2nd kind as shown in Figure 6, secondary side at the transformer T of supply convertor sets up low pressure auxiliary power supply winding Nf, the voltage providing stable after rectifying and wave-filtering and series voltage stabilizing 10 is powered to above-mentioned pilot circuit 9, the transformer technique for coiling in supply convertor so also can be made complicated, increase the electromagnetic interference of supply convertor, element increases, cost increase; When supply convertor output voltage becomes low because of constant current or overload, auxiliary power supply voltage also becomes low, and pilot circuit 9 can not work; Series voltage stabilizing 10 can bring loss, and when especially auxiliary power supply winding Nf both end voltage is higher, loss is bigger, and supply convertor idling consumption is increased, and load efficiency reduces, and makes power supply be difficult to meet the efficiency standard of more and more high request.
The third is as shown in Figure 7, the output voltage of supply convertor provides stabilized voltage to power to above-mentioned pilot circuit 9 after series voltage stabilizing 10, there is output voltage equally and become low control circuit 9 by inoperable problem in this kind of method, also make circuit complicated, cost increase, supply convertor idling consumption is increased, and load efficiency reduces.
4th kind as shown in Figure 8, the voltage providing stable after resistance-capacitance depressurization current rectifying and wave filtering circuit step-down after series voltage stabilizing 10 by the pulsed voltage at the rectifying tube two ends of supply convertor secondary side is powered to above-mentioned pilot circuit 9, this circuit can solve supply convertor and become the low inoperable problem of control circuit 9 at output voltage, but circuit is more complicated also, cost height, supply convertor idling consumption is increased, and load efficiency reduces.
Practical novel content
In view of this, the technical problems to be solved in the utility model is to provide a kind of series resonance decompression converting circuit. The pulsed voltage that the wide region at the rectifying tube two ends of the supply convertor secondary side of PFM master mode changes can be converted to the smaller low pressure of variation range and power to other pilot circuit in supply convertor by this series resonance decompression converting circuit, transformer technique can not bring impact, without the serial regulating circuit increasing loss, circuit is simple, cost is low, and loss is low.
For solving the problems of the technologies described above, a kind of technical scheme that the utility model provides is:
A kind of series resonance decompression converting circuit, described circuit comprises: two for connecting the input terminus of high-voltage pulsed source, a low dc voltage output plus terminal, low dc voltage exports negative terminal, low dc voltage exports negative terminal and one of them input terminus connects, and described circuit also comprises:
Series connection access inductance L 1, first electric capacity C1 and the first diode D1 between two input terminuss;
Wherein, the anode of the first diode D1 exports negative terminal with direct current and is connected, one end and an input terminus of the series circuit of inductance L 1, first electric capacity C1 connect, the other end of the series circuit of inductance L 1, first electric capacity C1 and the negative electrode of the first diode D1 connect, the negative electrode of the first diode D1 and the anode of the 2nd diode D2 connect, one end of the negative electrode of the 2nd diode D2 and low dc voltage output plus terminal and the 2nd electric capacity C2 connects, and the other end of the 2nd electric capacity C2 and low dc voltage export negative terminal and connect.
Wherein in an embodiment, described low dc voltage output plus terminal and low dc voltage export a resistance R1 in parallel between negative terminal.
Wherein in an embodiment, described first diode D1 is Zener diode.
Wherein in an embodiment, described circuit also comprises:
Rectifying bridge unit, an ac input end of described rectifying bridge unit is connected with in described input terminus, and another ac input end of described rectifying bridge unit is connected with described inductance L 1 and the first electric capacity C1 and the 2nd electric capacity C2.
Wherein in an embodiment, between described first diode D1 and the 2nd diode D2, also it is in series with a pilot circuit.
Wherein in an embodiment, described pilot circuit can be MCU or Programmable logical controller circuit or micro-chip.
Useful effect:
The utility model provides a kind of series resonance decompression converting circuit, when input terminus input voltage height, when frequency is higher than the pulsed voltage of inductance and the series resonance frequency of the first electric capacity, circuit equivalent impedance comparison is big, equivalent load two ends obtain a proper low voltage, when input terminus input voltage is lower, frequency a little more than or during close to the pulsed voltage of inductance and the series resonance frequency of the first electric capacity, now the equivalent impedance of circuit is smaller, then equivalent load still can obtain a proper voltage, the voltage at equivalent load two ends is made to maintain in a suitable scope, make equivalent load energy reliability service, because of series resistor non-between input and output, lossless, play step-down, the effect of loss also can not be increased while voltage stabilizing.
The utility model provides a kind of series resonance decompression converting circuit, can obtain from the secondary side rectifying tube two ends of supply convertor and compare high pulsed voltage, even if when the output voltage of supply convertor is down to very low, still higher pulsed voltage input series resonance decompression converting circuit can be obtained, series resonance decompression converting circuit still can export the voltage of other pilot circuits work in a proper supply convertor, solves supply convertor output voltage and becomes the low inoperable problem of control circuit.
The utility model provides a kind of series resonance decompression converting circuit, it is that the secondary side rectifying tube two ends from supply convertor obtain and compare high pulsed voltage, without the need to increasing the winding of auxiliary power supply at the secondary side of supply convertor, simplify transformer technique, also with regard to the loss problem eliminating the electromagnetic interference problem that brings of winding because increasing auxiliary power supply and the serial regulating circuit that increases for stable auxiliary power supply voltage brings.
Accompanying drawing explanation
Fig. 1 is a kind of schematic circuit implementing mode of series resonance decompression converting circuit of the present utility model;
Fig. 2 is the schematic circuit that another kind of series resonance decompression converting circuit of the present utility model implements mode;
Fig. 3 is a kind of embody rule schematic circuit of the series resonance decompression converting circuit in the utility model;
Fig. 4 is series resonance decompression converting circuit another kind of embody rule schematic circuit in the utility model;
Fig. 5 is the third embody rule schematic circuit of the series resonance decompression converting circuit in the utility model;
Fig. 6 is the schematic circuit of a kind of low-voltage power supply mode of series resonance decompression converting circuit of prior art;
Fig. 7 is the schematic circuit of series resonance decompression converting circuit another kind of low-voltage power supply mode of prior art;
Fig. 8 is the schematic circuit of the third low-voltage power supply mode of series resonance decompression converting circuit of prior art.
Embodiment
The utility model is explained in further detail below in conjunction with accompanying drawing and embodiment for the ease of it is understood by those skilled in the art that.
A kind of series resonance decompression converting circuit, described circuit comprises: two for connecting the input terminus of high-voltage pulsed source, a low dc voltage output plus terminal, low dc voltage exports negative terminal, low dc voltage exports negative terminal and one of them input terminus connects, and described circuit also comprises:
Series connection access inductance L 1, first electric capacity C1 and the first diode D1 between two input terminuss;
Wherein, the anode of the first diode D1 exports negative terminal with direct current and is connected, one end and an input terminus of the series circuit of inductance L 1, first electric capacity C1 connect, the other end of the series circuit of inductance L 1, first electric capacity C1 and the negative electrode of the first diode D1 connect, the negative electrode of the first diode D1 and the anode of the 2nd diode D2 connect, one end of the negative electrode of the 2nd diode D2 and low dc voltage output plus terminal and the 2nd electric capacity C2 connects, and the other end of the 2nd electric capacity C2 and low dc voltage export negative terminal and connect.
Wherein in an embodiment, described low dc voltage output plus terminal and low dc voltage export a resistance R1 in parallel between negative terminal.
Wherein in an embodiment, described first diode D1 is Zener diode.
Wherein in an embodiment, described circuit also comprises:
Rectifying bridge unit, an ac input end of described rectifying bridge unit is connected with in described input terminus, and another ac input end of described rectifying bridge unit is connected with described inductance L 1 and the first electric capacity C1 and the 2nd electric capacity C2.
Wherein in an embodiment, between described first diode D1 and the 2nd diode D2, also it is in series with a pilot circuit.
Wherein in an embodiment, described pilot circuit can be MCU or Programmable logical controller circuit or micro-chip.
As shown in Figure 1, a kind of series resonance decompression converting circuit, comprise two for connecting the input terminus 1 and 2 of high-voltage pulsed source, a low dc voltage output plus terminal 3, a low dc voltage exports negative terminal 4, output negative terminal 4 and input terminus 2 connect, series connection access inductance L 1 between input terminus 1 and 2, electric capacity C1 and diode D2, the anode of diode D2 exports negative terminal 4 with direct current and is connected, inductance L 1, one end of the series circuit of electric capacity C1 and another input terminus 1 connect, inductance L 1, the anode of the other end of the series circuit of electric capacity C1 and the negative electrode of diode D2 and diode D1 connects, the negative electrode of diode D1 and one end of direct current output plus terminal 3 and electric capacity C2 connect, the other end of electric capacity C2 and direct current export negative terminal 4 and connect.Direct current output plus terminal 3 and direct current export can a resistance R1 in parallel between negative terminal 4.
It is another kind of series resonance decompression converting circuit shown in Fig. 2, comprises two for connecting the input terminus 1 and 2 of high-voltage pulsed source, a low pressureDirect current output plus terminal 3A low dc voltage exports negative terminal 4, diode D4, D5, D6, D7, electric capacity C4, C5 and inductance L 2, diode D4, D5, D6, D7 form rectification bridge, an ac input end of rectification bridge and input terminus 2 connect, one end of the series circuit of another ac input end and inductance L 2, electric capacity C4 connects, the other end and the input terminus 1 of the series circuit of inductance L 2, electric capacity C4 connect, the output plus terminal of rectification bridge and direct current output plus terminal 3 and electric capacity C5 one end connect, and the output negative terminal of rectification bridge and direct current export negative terminal 4 and the electric capacity C5 the other end connects.
A kind of series resonance decompression converting circuit shown in Fig. 1 is applicable to being applied to Fig. 3, in the secondary side winding NS institute junction circuit of the supply transformer T shown in Fig. 4 and Fig. 5, tandem electric inductance L1 in series resonance decompression converting circuit, one end of this input terminus 1 of electric capacity C1 series resonance circuit and the secondary side winding Ns of rectification diode D3 negative electrode and supply transformer T connects, another input terminus 2 of series resonance decompression converting circuit is connected to rectification diode D3 anode, the secondary side winding NS the other end of supply transformer T is connected to power supply and exports VO+ end, rectification diode D3 anode is connected to and exports VO-end. circuit shown in Fig. 4 is that the rectification diode D3 field effect transistor Q1 with synchronous rectification substitutes, and the drain electrode of Q1 is connected to and exports VO-end, and the source electrode of Q1 is connected to the input terminus 1 of series resonance decompression converting circuit. circuit shown in Fig. 5 changes into the negative electrode of rectification diode D3 in circuit shown in Fig. 4 being connected to power supply output VO+ end, and the anode of D3 changes the one end of the secondary side winding NS being connected to transformer T into.
In a kind of series resonance decompression converting circuit application circuit shown in Fig. 3, because the Power convert device of high energy efficiency generally adopts the variable frequency control of switch turn-off time regulating primary side, when Power convert device input ac voltage is lower, the switch ON time of primary side is long, when input ac voltage is higher, ON time is shorter, during the elementary end trip switch conducting of power supply, rectification diode D3 is not conducting, and the secondary side winding NS two ends induced voltage of supply transformer T is then input to series resonance decompression converting circuit. when Power convert device input ac voltage is minimum, inductance L 1 is set, the time of the series resonance cycle half of electric capacity C1 is slightly larger than switch ON time, now, series resonant tank is weak perception, induction reactance is smaller, series resonance decompression converting circuit exports volts DS and reduces fewer, and when Power convert device input ac voltage is higher, because switch ON time becomes short, series resonant tank is in strong perception, induction reactance becomes big, then series resonance decompression converting circuit exports volts DS reduction often, make the direct current output voltage of series resonance decompression converting circuit less with changing during input ac voltage wide variation, tend towards stability in the voltage range of other pilot circuit normal operation of an applicable Power convert device low-pressure secondary side.
A kind of series resonance decompression converting circuit shown in Fig. 2 is applicable to being applied to pulse that input ac voltage is positive and negative symmetry or the dutycycle circuit close to 50% pulse, can also being applied in sinusoidal ac circuit, the time width of the pulse of input ac voltage or time semi-period of sinusoidal ac are less than the time of inductance L 2, electric capacity C4 series circuit resonance cycle half.
Being more than wherein specific implementation of the present utility model, it describes comparatively concrete and detailed, but therefore can not be interpreted as the restriction to the utility model patent scope. , it is also possible to make some distortion and improvement, it should be appreciated that for the person of ordinary skill of the art, without departing from the concept of the premise utility these apparent replacement forms all belong to protection domain of the present utility model.
Claims (6)
1. a series resonance decompression converting circuit, described circuit comprises: two for connecting the input terminus of high-voltage pulsed source, a low dc voltage output plus terminal, a low dc voltage exports negative terminal, low dc voltage exports negative terminal and one of them input terminus connects, it is characterised in that, described circuit also comprises:
Series connection access inductance L 1, first electric capacity C1 and the first diode D1 between two input terminuss;
Wherein, the anode of the first diode D1 exports negative terminal with direct current and is connected, one end and an input terminus of the series circuit of inductance L 1, first electric capacity C1 connect, the other end of the series circuit of inductance L 1, first electric capacity C1 and the negative electrode of the first diode D1 connect, the negative electrode of the first diode D1 and the anode of the 2nd diode D2 connect, one end of the negative electrode of the 2nd diode D2 and low dc voltage output plus terminal and the 2nd electric capacity C2 connects, and the other end of the 2nd electric capacity C2 and low dc voltage export negative terminal and connect.
2. a kind of series resonance decompression converting circuit according to claim 1, it is characterised in that, described low dc voltage output plus terminal and low dc voltage export in parallel between negative terminal or a resistance R1 not in parallel.
3. a kind of series resonance decompression converting circuit according to claim 1, it is characterised in that, described first diode D1 can be Zener diode.
4. a kind of series resonance decompression converting circuit according to claim 1, it is characterised in that, described circuit also comprises:
Rectifying bridge unit, an ac input end of described rectifying bridge unit is connected with in described input terminus, and another ac input end of described rectifying bridge unit is connected with described inductance L 1 and the first electric capacity C1 and the 2nd electric capacity C2.
5. a kind of series resonance decompression converting circuit according to claim 1, it is characterised in that, described low dc voltage output plus terminal and low dc voltage export and are parallel with a pilot circuit between negative terminal.
6. a kind of series resonance decompression converting circuit according to claim 5, it is characterised in that, described pilot circuit can be digital circuit or mimic channel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620064746.3U CN205304630U (en) | 2016-01-25 | 2016-01-25 | Series resonance step -down converting circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620064746.3U CN205304630U (en) | 2016-01-25 | 2016-01-25 | Series resonance step -down converting circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205304630U true CN205304630U (en) | 2016-06-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620064746.3U Active CN205304630U (en) | 2016-01-25 | 2016-01-25 | Series resonance step -down converting circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205304630U (en) |
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2016
- 2016-01-25 CN CN201620064746.3U patent/CN205304630U/en active Active
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