CN2664278Y - DC/DC power supply module having under-voltage and current-limiting protection - Google Patents
DC/DC power supply module having under-voltage and current-limiting protection Download PDFInfo
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- CN2664278Y CN2664278Y CN 200320109418 CN200320109418U CN2664278Y CN 2664278 Y CN2664278 Y CN 2664278Y CN 200320109418 CN200320109418 CN 200320109418 CN 200320109418 U CN200320109418 U CN 200320109418U CN 2664278 Y CN2664278 Y CN 2664278Y
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Abstract
The utility mode relates to a DC/DC power supply module having under-voltage and current-limiting protection, which is characterized in that the utility comprises a surge inhibit circuit, an input filter circuit, a reverse connecting protective circuit, a switch main circuit, an output rectification circuit, an output filter circuit, a low-voltage protection circuit, a drive control circuit, an overcurrent detection circuit and a sampling feedback circuit, wherein the surge inhibit circuit, the input filter circuit, the reverse connecting protective circuit, the switch main circuit, the output rectification circuit, and the output filter circuit are connected in order; the input end of the low-voltage protection circuit is connected with the input filter circuit, the output end is connected with the drive control circuit; the input end of the drive control circuit is also connected with the overcurrent detection circuit and the sampling feedback circuit, the output end is connected with the switch main circuit; the input end of the sampling feedback circuit is connected with the output filter circuit. The utility model is of a simple structure and low cost. The utility model has the advantages of overcurrent protection, under-voltage protection and high conversion efficiency.
Description
Technical field
The utility model relates to a kind of power supply change-over device, and the voltage transitions that relates in particular to circuit board level in a kind of system that is suitable for centrally connected power supply has under-voltage and DC/DC power module current-limiting protection.
Background technology
The supply power mode of circuit board generally can be divided into two kinds in various communications and industrial control system, and the one, have the stabilized voltage power supply of various voltages according to the requirement of circuit board configuration; The 2nd, concentrating provides single power supply such as single 24VDC, and required various voltages then dispose the DC/DC power module and obtain on each circuit board, so the DC/DC power module is used widely in communication and industrial control system.And be applied to the DC/DC power module of these systems at present, because to performance and reliability requirement height, and to possess various defencive functions, and adopt integrated circuit mostly, the line construction complexity, product cost is higher.
Summary of the invention
For solving complex circuit; the problem that product cost is higher, the utility model proposes one simple in structure, have the DC/DC power module of the under-voltage and current-limiting protection of having of necessary defencive function again; this power module all adopts discrete device; two-sided paster is installed, and adopts the copper shell, special-purpose casting glue embedding; properties of product are good; disturb little, the reliability height, cost is low.Be very suitable for circuit board level power source conversion in communication and the industrial control system.
The technical measures that the utility model is taked are: have under-voltage and DC/DC power module current-limiting protection, be characterized in, comprise: surge restraint circuit, input filter circuit, reverse-connection protection circuit, switch main circuit, output rectification circuit, output filter circuit, under-voltage protection circuit, Drive and Control Circuit, overcurrent sensing circuit and sampling feedback circuit; Described surge restraint circuit is used for reducing the start surge current, and its output is connected with the input of input filter circuit; Described input filter circuit is used to reduce input voltage ripple and high-frequency harmonic, and its output is connected with the input of reverse-connection protection circuit with the under-voltage protection circuit respectively; Described reverse-connection protection circuit is used to prevent to import reversal connection and causes power module to damage, and its output is connected with the input of switch main circuit; Described under-voltage protection circuit is used for power module is carried out under-voltage protection, and its output is connected with the input of Drive and Control Circuit; Described switch main circuit is used for the direct current of input is converted to the alternating current of high frequency, and its output is connected with the input of output rectification circuit and overcurrent sensing circuit respectively; Described overcurrent sensing circuit is used to prevent that output current is excessive and damage employed electrical equipment, and its output is connected with the input of Drive and Control Circuit; The output of described Drive and Control Circuit is connected with the control end of switch main circuit; The output of described output rectification circuit is connected with the input of output filter circuit; Described output filter circuit output supply voltage outputs to this voltage the input of sampling feedback circuit simultaneously to electrical appliance; Described sampling feedback circuit is used for output voltage is compared and the error amplification, and its output is connected with the input of Drive and Control Circuit.
Above-mentioned have under-voltage and DC/DC power module current-limiting protection, and wherein, described surge restraint circuit is made of the big resistance resistance that the input at circuit is connected in series.
Above-mentioned have under-voltage and DC/DC power module current-limiting protection, and wherein, described reverse-connection protection circuit is made of a diode that is connected in parallel on circuit input end.
Above-mentioned have under-voltage and DC/DC power module current-limiting protection, and wherein, described switch main circuit mainly is made of main transformer TR1A and the switching tube Q4 that is serially connected in this primary.
Above-mentioned have under-voltage and DC/DC power module current-limiting protection; wherein, described under-voltage protection circuit mainly by resistance R 2, R3, triode Q1, the constant current tube D11 that is connected in parallel on voltage-stabiliser tube D2 between this transistor base and the collector electrode, is connected in parallel on the voltage-stabiliser tube D3 between this transistor collector and the emitter and is serially connected in this this transistor collector constitutes.
Above-mentioned have under-voltage and DC/DC power module current-limiting protection, and wherein, described Drive and Control Circuit mainly is made of the importation U1B of switch transformer auxiliary winding TR1B, constant current tube DI2, triode Q2, Q3 and photocoupler.
Above-mentioned have under-voltage and DC/DC power module current-limiting protection, and wherein, described overcurrent sensing circuit mainly is made of the voltage-stabiliser tube D5 between base stage that is connected in parallel on triode Q2 and the attached winding TR1B of switch transformer.
Above-mentioned have under-voltage and DC/DC power module current-limiting protection, and wherein, described sampling feedback circuit mainly is made of the output U1A and the voltage-stabiliser tube U2 able to programme of photocoupler.
Because the utility model has adopted above technical scheme, so effect is tangible:
1, line construction is simple, the conversion efficiency height;
2, on switch transformer, be provided with one and pay winding, both realized that the self-excitation of switching tube drove, realized the output overcurrent protection again;
3, be provided with the under voltage protection circuit, cross on-off switching tube when low at supply voltage, the protection power module is not damaged;
4, adopt more succinct line construction, relatively low product cost has solved the cost performance problem of small-power DC/DC power module well.
Description of drawings
Below in conjunction with drawings and Examples the utility model is further described.
Fig. 1 is an electric theory diagram of the present utility model.
Fig. 2 is the circuit theory diagrams of the utility model one embodiment.
Embodiment
See also Fig. 1.The utlity model has under-voltage and DC/DC power module current-limiting protection, comprising: surge restraint circuit 1, input filter circuit 2, reverse-connection protection circuit 3, under-voltage protection circuit 4, switch main circuit 5, Drive and Control Circuit 6, overcurrent sensing circuit 7, output rectification circuit 8, filter circuit 9 and sampling feedback circuit 10.Surge restraint circuit 1 is used for reducing the start surge current, and its output is connected with the input of input filter circuit; Input filter circuit 2 is used to reduce input voltage ripple and high-frequency harmonic, and its output is connected with the input of reverse-connection protection circuit 3 with under-voltage protection circuit 4 respectively; Reverse-connection protection circuit 3 is used to prevent to import reversal connection and causes power module to damage, and its output is connected with the input of switch main circuit 5; Under-voltage protection circuit 4 is used for power module is carried out under-voltage protection, and its output is connected with the input of Drive and Control Circuit 6; Switch main circuit 5 is used for the direct current of input is converted to the alternating current of high frequency, and its output is connected with the input of output rectification circuit 8 with overcurrent sensing circuit 7 respectively; Overcurrent sensing circuit 7 is used to prevent that output current is excessive and damage employed electrical equipment, and its output is connected with the input of Drive and Control Circuit 6; The output of Drive and Control Circuit 6 is connected with the control end of switch main circuit 5; The output of output rectification circuit 8 is connected with the input of output filter circuit 9; Output filter circuit 9 output supply voltages output to this voltage the input of sampling feedback circuit 10 simultaneously to electrical appliance; Sampling feedback circuit 10 is used for output voltage is compared and the error amplification, and its output is connected with the input of Drive and Control Circuit 6.
See also Fig. 2, this is the circuit theory diagrams of the utility model one embodiment.
Each physical circuit that the utlity model has the DC/DC power module of under-voltage and current-limiting protection is made of circuit in the frame of broken lines among the figure, wherein:
Surge restraint circuit 1 is made of the thermistor R0 that the input at circuit is connected in series, and can reduce the surge current of starting shooting.
Inductance L 1, resistance R 1, capacitor C 1, C2, C3, C4 form input filter circuit 2, and wherein, capacitor C 1, C2, C3, C4 are input filter capacitor.
Reverse-connection protection circuit 3 is made of a diode D1 who is connected in parallel on circuit input end, prevents to import reversal connection and causes power module to damage.
Under-voltage protection circuit 4 mainly by resistance R 2, R3, triode Q1, the constant current tube D11 that is connected in parallel on voltage-stabiliser tube D2 between this transistor base and the collector electrode, is connected in parallel on the voltage-stabiliser tube D3 between this transistor collector and the emitter and is serially connected in this this transistor collector constitutes.
TR1 is a switch transformer, and its main winding TR1A and the switching tube Q4 that is serially connected in this primary constitute switch main circuit 5.
Drive and Control Circuit 6 mainly is made of the importation U1B of capacitor C 6, C7, C8, C9, diode D6, D7, resistance R 2, R7, R8, R9, R10, switch transformer auxiliary winding TR1B, constant current tube DI2, triode Q2, Q3 resistance R 6, voltage stabilizing didoe D5 and photocoupler.Drive circuit as switching tube Q4 in the switch main circuit.Constant current tube DI2, resistance R 11 are formed the start-up circuit of Drive and Control Circuit in the circuit.
Diode D8, D9, D10 are that rectifier diode constitutes output rectification circuit 8.
In the output filter circuit 9: L2, L3, L4 are filter inductance; Capacitor C 14, C15, C16, C17, C18, C19, C20, C21 are output filter capacitor; Resistance R 13 is the dead load of output filter circuit; L5 is an output inductor.
The output U1A of voltage-stabiliser tube U2 able to programme, photocoupler, resistance R 14, R15, R16, R17, R18, R19 and capacitor C 22 are formed voltage sampling feedback and voltage stabilizing circuit 10.
Among the figure: P24 is the input voltage positive pole, and G24 is the input voltage negative pole; P12 is the output voltage positive pole, and G12 is the output voltage negative pole.
The course of work of the present utility model is: both positive and negative polarity P24, G24 two ends at input voltage add the 24V direct voltage; starting resistor is provided for switching tube Q4 by start-up circuit diode DI2, resistance R 11; make switching tube Q4 conducting; transformer TR1 energy storage; on the transformer auxiliary winding TR1B of circuit overcurrent protection, induce simultaneously 3 just, 4 negative voltages, by capacitor C 6, resistance R 7, diode D6, optical transistor U1B to capacitor C 7 chargings.When voltage was more than or equal to 0.7V on the capacitor C 7, triode Q2 and Q3 conducting with switching tube Q4 grounded-grid, turn-offed Q4.On transformer TR1, produce 8 positive 7 negative, 5 positive 6 negative voltages this moment, by diode D8, D9, D10 rectification, become level and smooth 5V direct voltage through capacitor C 14-capacitor C 21, inductance L 5 filtering, form the output voltage sampling by resistance R 17, R18, forming voltage reference and error amplifying circuit by voltage-stabiliser tube U2 able to programme, capacitor C 22, resistance R 14, R15, R16 compares with error and amplifies, feed back to the control circuit of input side by U1, change the Q4 ON time, guarantee output voltage stabilization.
The utility model is formed circuit overcurrent protection by resistance R 6, diode D5; its effect is: transformer auxiliary winding TR1B goes up the induced voltage increase when output current increases; when induced voltage increases to above diode D5 voltage stabilizing value; TR1B produces a current branch by resistance R 6, diode D5; to capacitor C 7 chargings; make triode Q2, Q3 conducting in advance, switching tube Q4 turn-offs, and output voltage is reduced.
The utility model is formed the under-voltage protection circuit by resistance R 2, R3, diode D2, D3, triode Q1, constant current tube DI1, its effect is: when input voltage is crossed when low, triode Q1 conducting, make constant current tube DI1 directly give capacitor C 7 chargings, capacitor C 7 voltages keep 0.7V always, triode Q2, Q3 conducting, switching tube Q4 turn-offs, and power module is in the under-voltage protection state; When input voltage rose to normal value, triode Q1 turn-offed, and power module recovers operate as normal.
The utility model line construction is simple, and product cost is low.Have output overcurrent protection, under voltage protection and the high advantage of conversion efficiency.
Claims (8)
1, the DC/DC power module that has under-voltage and current-limiting protection, it is characterized in that, comprising: surge restraint circuit, input filter circuit, reverse-connection protection circuit, switch main circuit, output rectification circuit, output filter circuit, under-voltage protection circuit, Drive and Control Circuit, overcurrent sensing circuit and sampling feedback circuit;
Described surge restraint circuit is used for reducing the start surge current, and its output is connected with the input of input filter circuit;
Described input filter circuit is used to reduce input voltage ripple and high-frequency harmonic, and its output is connected with the input of reverse-connection protection circuit with the under-voltage protection circuit respectively;
Described reverse-connection protection circuit is used to prevent to import reversal connection and causes power module to damage, and its output is connected with the input of switch main circuit;
Described under-voltage protection circuit is used for power module is carried out under-voltage protection, and its output is connected with the input of Drive and Control Circuit;
Described switch main circuit is used for the direct current of input is converted to the alternating current of high frequency, and its output is connected with the input of output rectification circuit and overcurrent sensing circuit respectively;
Described overcurrent sensing circuit is used to prevent that output current is excessive and damage employed electrical equipment, and its output is connected with the input of Drive and Control Circuit;
The output of described Drive and Control Circuit is connected with the control end of switch main circuit;
The output of described output rectification circuit is connected with the input of output filter circuit;
Described output filter circuit output supply voltage outputs to this voltage the input of sampling feedback circuit simultaneously to electrical appliance;
Described sampling feedback circuit is used for output voltage is compared and the error amplification, and its output is connected with the input of Drive and Control Circuit.
2, the DC/DC power module with under-voltage and current-limiting protection according to claim 1 is characterized in that, described surge restraint circuit is made of the thermistor that the input at circuit is connected in series.
3, the DC/DC power module with under-voltage and current-limiting protection according to claim 1 is characterized in that, described reverse-connection protection circuit is made of a diode that is connected in parallel on circuit input end.
4, the DC/DC power module with under-voltage and current-limiting protection according to claim 1 is characterized in that, described switch main circuit mainly is made of main transformer TR1A and the switching tube Q4 that is serially connected in this primary.
5, the DC/DC power module with under-voltage and current-limiting protection according to claim 1; it is characterized in that, described under-voltage protection circuit mainly by resistance R 2, R3, triode Q1, the constant current tube D11 that is connected in parallel on voltage-stabiliser tube D2 between this transistor base and the collector electrode, is connected in parallel on the voltage-stabiliser tube D3 between this transistor collector and the emitter and is serially connected in this this transistor collector constitutes.
6, the DC/DC power module with under-voltage and current-limiting protection according to claim 1; it is characterized in that described Drive and Control Circuit mainly is made of the importation U1B of switch transformer auxiliary winding TR1B, constant current tube DI2, triode Q2, Q3 and photocoupler.
7, the DC/DC power module with under-voltage and current-limiting protection according to claim 1 is characterized in that, described overcurrent sensing circuit mainly is made of the voltage-stabiliser tube D5 between base stage that is connected in parallel on triode Q2 and the attached winding TR1B of switch transformer.
8, the DC/DC power module with under-voltage and current-limiting protection according to claim 1 is characterized in that, described sampling feedback circuit mainly is made of the output U1A and the voltage-stabiliser tube U2 able to programme of photocoupler.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200320109418 CN2664278Y (en) | 2003-10-31 | 2003-10-31 | DC/DC power supply module having under-voltage and current-limiting protection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200320109418 CN2664278Y (en) | 2003-10-31 | 2003-10-31 | DC/DC power supply module having under-voltage and current-limiting protection |
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| Publication Number | Publication Date |
|---|---|
| CN2664278Y true CN2664278Y (en) | 2004-12-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200320109418 Expired - Lifetime CN2664278Y (en) | 2003-10-31 | 2003-10-31 | DC/DC power supply module having under-voltage and current-limiting protection |
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| CN (1) | CN2664278Y (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100409529C (en) * | 2005-01-11 | 2008-08-06 | 富晶半导体股份有限公司 | Over low voltage protection device for coil drive device |
| CN102497096A (en) * | 2011-11-25 | 2012-06-13 | 成都天奥电子股份有限公司 | DC/DC converter for preprocessing direct-voltage under-voltage surges |
| CN102623962A (en) * | 2011-01-30 | 2012-08-01 | 深圳市航嘉驰源电气股份有限公司 | Adaptive lightning-protection surge-protection control circuit |
| CN103108470A (en) * | 2013-02-06 | 2013-05-15 | 深圳市芯飞凌半导体有限公司 | Dynamic linear control light emitting diode (LED) driver circuit |
| CN103916011A (en) * | 2012-12-31 | 2014-07-09 | 乐金显示有限公司 | Power Supplying Apparatus And Display Apparatus Including The Same |
| CN106300235A (en) * | 2016-10-09 | 2017-01-04 | 中国电子科技集团公司第三十六研究所 | A kind of power-supply system |
| CN106410740A (en) * | 2016-06-23 | 2017-02-15 | 北京全路通信信号研究设计院集团有限公司 | Power port protection circuit |
| CN106445059A (en) * | 2016-09-05 | 2017-02-22 | 深圳市炜烨丰电子科技有限公司 | Hard disk protection circuit for voltage leap of alternating-current power network |
| CN104283472B (en) * | 2013-07-03 | 2017-06-20 | 环旭电子股份有限公司 | Voltage regulator and its excessively low voltage protection circuit |
| CN108347172A (en) * | 2018-03-07 | 2018-07-31 | 山东超越数控电子股份有限公司 | A kind of isolation DC-DC power module meeting GJB181 standards |
-
2003
- 2003-10-31 CN CN 200320109418 patent/CN2664278Y/en not_active Expired - Lifetime
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100409529C (en) * | 2005-01-11 | 2008-08-06 | 富晶半导体股份有限公司 | Over low voltage protection device for coil drive device |
| CN102623962B (en) * | 2011-01-30 | 2015-03-25 | 深圳市航嘉驰源电气股份有限公司 | Adaptive lightning-protection surge-protection control circuit |
| CN102623962A (en) * | 2011-01-30 | 2012-08-01 | 深圳市航嘉驰源电气股份有限公司 | Adaptive lightning-protection surge-protection control circuit |
| CN102497096A (en) * | 2011-11-25 | 2012-06-13 | 成都天奥电子股份有限公司 | DC/DC converter for preprocessing direct-voltage under-voltage surges |
| CN103916011A (en) * | 2012-12-31 | 2014-07-09 | 乐金显示有限公司 | Power Supplying Apparatus And Display Apparatus Including The Same |
| CN103108470B (en) * | 2013-02-06 | 2015-06-03 | 深圳市芯飞凌半导体有限公司 | Dynamic linear control light emitting diode (LED) driver circuit |
| CN103108470A (en) * | 2013-02-06 | 2013-05-15 | 深圳市芯飞凌半导体有限公司 | Dynamic linear control light emitting diode (LED) driver circuit |
| CN104283472B (en) * | 2013-07-03 | 2017-06-20 | 环旭电子股份有限公司 | Voltage regulator and its excessively low voltage protection circuit |
| CN106410740A (en) * | 2016-06-23 | 2017-02-15 | 北京全路通信信号研究设计院集团有限公司 | Power port protection circuit |
| CN106445059A (en) * | 2016-09-05 | 2017-02-22 | 深圳市炜烨丰电子科技有限公司 | Hard disk protection circuit for voltage leap of alternating-current power network |
| CN106445059B (en) * | 2016-09-05 | 2023-09-08 | 深圳市炜烨丰电子科技有限公司 | Hard disk protection circuit for sudden change of alternating current power grid voltage |
| CN106300235A (en) * | 2016-10-09 | 2017-01-04 | 中国电子科技集团公司第三十六研究所 | A kind of power-supply system |
| CN106300235B (en) * | 2016-10-09 | 2018-09-28 | 中国电子科技集团公司第三十六研究所 | A kind of power-supply system |
| CN108347172A (en) * | 2018-03-07 | 2018-07-31 | 山东超越数控电子股份有限公司 | A kind of isolation DC-DC power module meeting GJB181 standards |
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| C14 | Grant of patent or utility model | ||
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Expiration termination date: 20131031 Granted publication date: 20041215 |