CN201204546Y - Direct-current input voltage processing circuit - Google Patents
Direct-current input voltage processing circuit Download PDFInfo
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- CN201204546Y CN201204546Y CNU200820111312XU CN200820111312U CN201204546Y CN 201204546 Y CN201204546 Y CN 201204546Y CN U200820111312X U CNU200820111312X U CN U200820111312XU CN 200820111312 U CN200820111312 U CN 200820111312U CN 201204546 Y CN201204546 Y CN 201204546Y
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Abstract
The utility model discloses a DC input voltage processing circuit comprising a DC device, a comparator and a relay switch, wherein, the input end of the DC device is connected with the input power supply and the output end thereof is partially connected with the main circuit to carry out DC conversion to the input voltage, the input end of the comparator is connected with the input power supply and the output end thereof is connected with the input end of the relay switch to output corresponding control signals according to the intensity of the input voltage, the input end of the relay switch is connected with the output end of the comparator, and the two output ends of the relay switch are connected with the two ends of the DC device in parallel to select whether to pass by the DC device according to the control signals. The DC input voltage processing circuit of each embodiment of the utility model is low in cost, simple and practical, and can use relatively low cost to solve the problem that the voltage input range of the system power supply is not suitable for the main circuit input range.
Description
Technical field
The utility model relates to electronic applications, and is concrete, relates to a kind of DC input voitage treatment circuit.
Background technology
In electron trade; especially in direct current system; the situation that the input range that runs into system power supply input voltage range and conventional main circuit and need through regular meeting is not inconsistent; for example: in the 48V solar energy system; the voltage range of solar battery group is 36Vdc～85Vdc; and the input range that common main circuit needs is 36Vdc～75Vdc, and therefore, the system power supply input voltage range is greater than the input range of main circuit.At present, the resolution system input voltage range does not meet the input range that main circuit needs, general solution is that the requirement that special circuit that the main circuit input voltage requires satisfies system's input is satisfied in design, as: adopt special wide input voltage range (as: DC-to-DC (the being DC-DC) module of 36Vdc～100Vdc).
Inventor of the present utility model finds that the cost of DC-to-DC module of this special wide input voltage range is higher in realizing process of the present utility model.
The utility model content
The purpose of this utility model is the defect of high cost at wide input voltage processing mode in the prior art, proposes a kind of DC input voitage treatment circuit, to reduce cost.
For achieving the above object, according to an aspect of the present utility model, provide a kind of DC input voitage treatment circuit.
DC input voitage treatment circuit according to the utility model embodiment comprises: DC equipment, and its input links to each other with the input power supply, and output partly links to each other with main circuit, and input voltage is carried out direct current transformation; Comparator, its input links to each other with the input power supply, and output links to each other with the input of relay switch, exports control signal corresponding according to the size of input voltage; Relay switch, its input links to each other with the output of comparator, and two output is in parallel with the DC equipment two ends, selects whether bypass DC equipment according to control signal.
Wherein, relay switch can comprise: control section, coupling unit and by-pass switch, and the input of control section links to each other with the output of comparator, coupling unit Coupling Control part and by-pass switch, by-pass switch is in parallel with the DC equipment two ends; Control section is by the action of coupling unit control by-pass switch.
DC equipment can be reduced to the voltage that is fit to the main circuit part with the voltage of input power supply input.
When the voltage that DC equipment will be imported power supply input was reduced to the voltage that is fit to the main circuit part, comparator was at input voltage during less than default relatively control voltage, the output action signal; During greater than default relatively control voltage, stop the output action signal at input voltage.
When the voltage that DC equipment will be imported power supply input is reduced to the voltage that is fit to the main circuit part, relay switch when receiving the actuating signal that comparator sends, the close selection signal of by-pass switch of output; Relay switch is exported the selection signal of bypass switch opens when not receiving the actuating signal that comparator sends.
DC equipment can be the 12V/5W voltage-stabiliser tube, and relay switch can be the 48V relay, and comparator can be the LM339 comparator.
DC equipment can also be upgraded to the voltage that is fit to the main circuit part with the voltage of input power supply input.
When the voltage that DC equipment will be imported power supply input was upgraded to the voltage that is fit to the main circuit part, comparator was at input voltage during greater than default relatively control voltage, the output action signal; During less than default relatively control voltage, stop the output action signal at input voltage, relay switch when receiving the actuating signal that comparator sends, the close selection signal of by-pass switch of output; Relay switch is exported the selection signal of bypass switch opens when not receiving the actuating signal that comparator sends.
In the technique scheme, comparator can also comprise: return difference design subelement, comprise being connected the resistance and the diode of series connection with the positive input and the output of comparator, and be used to prevent that comparator from overturning repeatedly relatively controlling voltage.
DC equipment can be power voltage-stabiliser tube or power resistor.
The DC input voitage treatment circuit of each embodiment of the utility model has adopted general device, so cost is low, simple and practical, can use lower cost resolution system supply voltage input range to be not suitable for the problem of main circuit input range.
Other features and advantages of the utility model will be set forth in the following description, and, partly from specification, become apparent, perhaps understand by implementing the utility model.The purpose of this utility model and other advantages can realize and obtain by specifically noted structure in the specification of being write, claims and accompanying drawing.
Description of drawings
Accompanying drawing is used to provide further understanding of the present utility model, and constitutes the part of specification, is used from explanation the utility model with embodiment one of the present utility model, does not constitute restriction of the present utility model.In the accompanying drawings:
Fig. 1 shows the DC input voitage treatment circuit schematic diagram according to the utility model embodiment;
Fig. 2 shows according to control logic schematic flow sheet in the DC input voitage treatment circuit of the utility model embodiment;
Fig. 3 shows according to another control logic schematic flow sheet in the DC input voitage treatment circuit of the utility model embodiment
Fig. 4 shows that another is used for the DC input voitage treatment circuit schematic diagram of step-down Processing Example according to the utility model;
Fig. 5 shows according to control logic schematic flow sheet in Fig. 4 embodiment DC input voitage treatment circuit.
Embodiment
Below in conjunction with accompanying drawing preferred embodiment of the present utility model is described, should be appreciated that preferred embodiment described herein only is used for description and interpretation the utility model, and be not used in qualification the utility model.
Fig. 1 shows the DC input voitage treatment circuit schematic diagram according to the utility model embodiment.As shown in Figure 1, present embodiment comprises:
DC equipment 12, its input links to each other with input power supply (being designated as V1), and output partly links to each other with main circuit, and input voltage is carried out conversion, and the output direct voltage is V2 after the conversion;
Here adopted comparator and relay switch to limit the scope of input voltage, so can adopt the DC equipment of little input voltage range to carry out the direct voltage conversion.Therefore, this input voltage treatment circuit has adopted general device, so cost is low, simple and practical, can use lower cost resolution system supply voltage input range to be not suitable for the problem of main circuit input range.
Preferably, relay switch 16 comprises control section 162, coupling unit 164 and by-pass switch 166, and wherein, the input of control section 162 links to each other with the output of comparator 14, coupling unit 164 Coupling Control parts 162 and by-pass switch 166, by-pass switch 166 is in parallel with DC equipment 12 two ends; Control section 162 is by the action of coupling unit 164 control by-pass switches 166.This embodiment has adopted relay switch commonly used, has reduced cost.
Preferably, DC equipment 12 is used for the voltage of input power supply V1 input is reduced to the voltage that is fit to the main circuit part, and promptly V2 is for being fit to the voltage of main circuit part.Suppose the main circuit part, promptly the needed voltage range of V2 is [Vb1, Vb2], and the maximum voltage of V1 input is V1max〉Vb2, be provided with one at comparator 14 in advance and relatively control voltage Vc, wherein, Vc is less than the maximum Vb2 of the required voltage of main circuit part.Fig. 2 shows according to control logic schematic flow sheet in the DC input voitage treatment circuit of the utility model embodiment, may further comprise the steps:
Step 202: judging input voltage V1 whether less than default relatively control voltage Vc, is execution in step 204 then, otherwise execution in step 212;
Step 204: comparator output action signal;
Step 206: relay switch is when receiving the actuating signal that comparator sends, and the control section of relay switch begins action, the closing of contact of by-pass switch;
Step 208: the closing of contact of by-pass switch, DC equipment are by bypass, and output voltage V 2=V1＜Vb2 continues execution in step 202;
Step 212: input voltage V1 is greater than default relatively control voltage Vc, and comparator is failure to actuate, and stops the output action signal;
Step 214: the relay switch control section is failure to actuate, and the by-pass switch contact disconnects;
Step 216: DC equipment inserts major loop, and the pressure drop at DC equipment two ends is designated as Va, and then output voltage V 2=V1-Va selects suitable Va, makes V2=V1-Va＜Vb2.
The preferred embodiment has realized importing the voltage of power supply V1 input and has reduced to the voltage that is fit to the main circuit part.
Preferably, DC equipment 12 also can be used for the voltage of input power supply V1 input is upgraded to the voltage that is fit to the main circuit part among Fig. 1 embodiment.Suppose the main circuit part, promptly the needed voltage range of V2 is [Vb1, Vb2], and the minimum voltage of V1 input is V1min＜Vb1, is provided with one at comparator 14 in advance and relatively controls voltage Vc, and wherein, Vc is greater than the minimum value Vb1 of the required voltage of main circuit part.Fig. 3 shows according to another control logic schematic flow sheet in the DC input voitage treatment circuit of the utility model embodiment, may further comprise the steps:
Step 302: judging input voltage V1 whether greater than default relatively control voltage Vc, is execution in step 304 then, otherwise execution in step 312;
Step 304: comparator output action signal;
Step 306: relay switch is when receiving the actuating signal that comparator sends, and the control section of relay switch begins action, the closing of contact of by-pass switch;
Step 308: the closing of contact of by-pass switch, DC equipment be by bypass, output voltage V 2=V1〉Vc〉Vb1, continue execution in step 302;
Step 312: input voltage V1 is less than default relatively control voltage Vc, and comparator is failure to actuate, and stops the output action signal;
Step 314: the relay switch control section is failure to actuate, and the by-pass switch contact disconnects;
Step 316: DC equipment inserts major loop, and the pressure drop at DC equipment two ends is designated as Va, and then output voltage V 2=V1+Va selects suitable Va, makes V2=V1+Va〉Vb1.
This embodiment has realized importing the boost in voltage of power supply V1 input for being fit to the voltage of main circuit part.
Above embodiment utilizes the access of simple comparator 14 circuit control DC equipment 12, finally reach input voltage V1 is become the input voltage (being V2) that is fit to main circuit, satisfy the scope that main circuit allows, thereby avoided adopting the DC-to-DC module of wide input voltage range, reduced cost.
Fig. 4 is for another is used for the DC input voitage treatment circuit schematic diagram of the embodiment of step-down processing according to the utility model.
Wherein V1 is the input power supply of system, and V2 is the input power supply of main circuit part; If Vc is the relatively control voltage control point of comparator circuit voltage, Vb1～Vb2 is the input range of main circuit part, and Va is the step-down value of DC equipment; Final circuit will be realized Vb1＜V2＜Vb2; These several numerical value satisfy relation of plane: V1max down〉Vb2, Vc＜Vb2, V1max-Va＜Vb2.
The calculating of each device can be carried out as follows in the present embodiment:
Build the framework of input voltage treatment circuit as shown in Figure 1;
Obtain the maximum power that main circuit partly needs, thereby calculate the maximum current in the major loop;
Maximum current and maximum voltage drop according to major loop are determined DC equipment required voltage and power, and DC equipment belongs to power step-down part in the present embodiment, specifically can realize with power voltage-stabiliser tube or power resistor;
Determine the relatively control voltage operating point of comparator part according to the input range of main circuit part.
The input voltage range of supposing direct current system is that V1 is: 36Vdc～85Vdc; The input voltage range that main circuit needs is that V2 is: 36Vdc～75Vdc, maximum power is 10W.
The concrete calculating operation of selecting comprises:
Calculate the control voltage of each point, wherein V1 exceeds 10V than V2 maximum, so DC equipment adopts 12V voltage-stabiliser tube D2 step-down just can meet the demands.The maximum power of main circuit is 10W, because power P=UI, voltage is big more, and electric current is more little, for keeping certain surplus, (at this moment, in the time of V2=70-12=58), calculate the maximum current of major loop according to input voltage V1=70, this moment, electric current was 10W/ (70V-12V)=0.172A, this moment the loss P=0.172A*12V=2.06W on the D2, so adopt the voltage-stabiliser tube power of 5W to meet the demands, promptly DC equipment adopts the voltage-stabiliser tube of 5W/12V; Relay switch partly selects the 48V relay to meet the demands, and it will be understood by those skilled in the art that the 48V relay is the art technology term, is not that the voltage of expression relay is 48V, and the 48V relay represents that voltage range is 36Vdc～75Vdc;
Wherein V1+, V1-are system's input voltage, and voltage range is 36Vdc～85Vdc, and V2+, V2-are the input of main circuit part, can not be greater than 75Vdc;
Calculate the voltage at each control point, U1 is general LM339 comparator, the input range of LM339 comparator power supply is 2Vdc～36Vdc, adopt D1 (24V voltage-stabiliser tube) control VCC to give the power supply of LM339 comparator among Fig. 4, obtain the reference voltage V REF=12V of comparator simultaneously by R6, R7 electric resistance partial pressure for 24V voltage; By resistance R 8, R9 electric resistance partial pressure principle, when V1=70V, Vi=12V; What relay K 1 was selected for use is the 48V relay; DC equipment adopts voltage-stabiliser tube D2 (12V/5W voltage-stabiliser tube).
After the each several part device is selected to finish, can carry out step-down and handle.
In addition, in order to prevent that comparator from the overturn point perseveration, having adopted the return difference design among Fig. 4, utilize return difference design at positive input and the output series connection R10 and the D2 realization 2V of comparator, promptly be low resistance state when V1 overturns less than 70V, only could overturn again greater than 72V is high-impedance state.
Fig. 5 shows according to control logic schematic flow sheet in Fig. 4 embodiment DC input voitage treatment circuit, and the logic control flow process comprises:
Step 502: judging input voltage V1 whether less than 72V (relatively control voltage and be made as 70V, but consider the return difference circuit design, added the return difference pressure drop of 2V, prevent to move back and forth at the comparative voltage control point), is execution in step 504 then, otherwise execution in step 512;
Step 504: during input V1＜72V, Vi＜VREF=12V is so comparator U1 is output as low resistance state;
Step 506: relay switch is relay K 1 closure, and voltage-stabiliser tube D2 short circuit is by bypass;
Execution in step 502 is continued in step 508: output voltage V 2=V1＜70;
Step 512: input voltage V1〉72V, then Vi〉VREF=12V, comparator output high-impedance state;
Step 514: relay switch, promptly relay K 1 disconnects voltage-stabiliser tube D2 effect;
Step 516: voltage-stabiliser tube D2 is connected in series in the current supply circuit of module, V2=V1-12V then, if V1 reaches maximum voltage 85Vdc, then V2=85V-12V=73V satisfies the requirement of 36Vdc～75Vdc.
Among Fig. 4 and Fig. 5 embodiment, though the scope of V1 is 36Vdc～85Vdc, allowed band greater than main circuit, but can realize the scope of V2 is controlled at the scope that main circuit allows by above-mentioned voltage treatment circuit, be 36Vdc～73Vdc, can satisfy the requirement of main circuit DC-DC module 36Vdc～75Vdc.
Fig. 4 and Fig. 5 embodiment have carried out concrete in detail at step-down, process of boosting and input voltage treatment circuit and step-down treatment circuit are similar.Boost relatively control the voltage setting in the input processing circuit and control logic different with the step-down treatment circuit, no longer be illustrated.
Adopt the circuit of the foregoing description, can be simply, the low-cost requirement that solves input voltage range, the input of assurance main circuit goes for the system of various voltage ranges in allowed limits, has certain versatility.
In actual applications, above-mentioned utility model input voltage treatment circuit should be noted that several problems:
One, comparator circuit part
Comparator circuit partly is a logic control link of the present utility model, and the overturn point of its power supply and comparator is all reasonable in design, and the input of control main circuit in allowed limits;
Two, relay switch part
The selection of relay switch part relay is wanted rationally, select different voltage ranges at different inputs, as when the step-down, can use the normally opened contact of relay, DC equipment in the time of can guaranteeing to power on for the first time like this (as: voltage-stabiliser tube) device is connected in the loop, and the input voltage of main circuit can not overrun;
Three, DC equipment part
The selection that is connected on the DC equipment in the current supply circuit must be prudent, consider buck or boost scope and input current maximum, and prominent situation can use power voltage-stabiliser tube or power resistor to realize.
In sum, each embodiment of the utility model can adopt the access of simple comparator circuit control DC equipment, finally reach the input voltage of control main circuit, satisfy the scope that the main circuit input is allowing, solve the problem that input voltage is not suitable for main circuit part voltage range simply, cheaply, the input of assurance main circuit has been avoided the solution of the expensive input range module of conventional use in allowed limits, has improved competitiveness of product.
The above is a preferred embodiment of the present utility model only, is not limited to the utility model, and for a person skilled in the art, the utility model can have various changes and variation.All within spirit of the present utility model and principle, any modification of being done, be equal to replacement, improvement etc., all should be included within the protection range of the present utility model.
Claims (5)
1. a DC input voitage treatment circuit is characterized in that, comprising:
DC equipment, its input links to each other with the input power supply, and output partly links to each other with main circuit, and input voltage is carried out direct current transformation;
Comparator, its input links to each other with described input power supply, and output links to each other with the input of described relay switch, exports control signal corresponding according to the size of input voltage;
Relay switch, its input links to each other with the output of described comparator, and two output is in parallel with described DC equipment two ends, whether selects the described DC equipment of bypass according to described control signal.
2. DC input voitage treatment circuit according to claim 1 is characterized in that: described relay switch comprises: control section, coupling unit and by-pass switch,
Wherein, the input of described control section links to each other with the output of described comparator, described coupling unit be coupled described control section and described by-pass switch, and described by-pass switch is in parallel with described DC equipment two ends; Described control section is controlled the action of described by-pass switch by described coupling unit.
3. DC input voitage treatment circuit according to claim 1 is characterized in that, described comparator also comprises:
Return difference designs subelement, comprises the resistance and the diode of series connection, is connected with the positive input and the output of comparator, prevents that comparator from overturning repeatedly at the described voltage of relatively controlling.
4. according to any circuit that described DC input voitage is handled among the claim 1-3, it is characterized in that described DC equipment is power voltage-stabiliser tube or power resistor.
5. according to any described DC input voitage treatment circuit among the claim 1-3, it is characterized in that described DC equipment is the 12V/5W voltage-stabiliser tube, described relay switch is the 48V relay, and described comparator is the LM339 comparator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU200820111312XU CN201204546Y (en) | 2008-04-15 | 2008-04-15 | Direct-current input voltage processing circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU200820111312XU CN201204546Y (en) | 2008-04-15 | 2008-04-15 | Direct-current input voltage processing circuit |
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| Publication Number | Publication Date |
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| CN201204546Y true CN201204546Y (en) | 2009-03-04 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNU200820111312XU Expired - Lifetime CN201204546Y (en) | 2008-04-15 | 2008-04-15 | Direct-current input voltage processing circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102655377A (en) * | 2012-04-25 | 2012-09-05 | 华为技术有限公司 | Voltage regulating circuit |
-
2008
- 2008-04-15 CN CNU200820111312XU patent/CN201204546Y/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102655377A (en) * | 2012-04-25 | 2012-09-05 | 华为技术有限公司 | Voltage regulating circuit |
| CN102655377B (en) * | 2012-04-25 | 2015-05-27 | 华为技术有限公司 | Voltage regulating circuit |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20090304 |
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| CX01 | Expiry of patent term |