CN101170262B - DC power switching device - Google Patents
DC power switching device Download PDFInfo
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- CN101170262B CN101170262B CN2006101498306A CN200610149830A CN101170262B CN 101170262 B CN101170262 B CN 101170262B CN 2006101498306 A CN2006101498306 A CN 2006101498306A CN 200610149830 A CN200610149830 A CN 200610149830A CN 101170262 B CN101170262 B CN 101170262B
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- voltage
- relay
- switching device
- detection unit
- power source
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- 238000001514 detection method Methods 0.000 claims description 36
- 230000005669 field effect Effects 0.000 claims description 5
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- 230000001052 transient effect Effects 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000002950 deficient Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 230000008520 organization Effects 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- KJBWWVTTZNVMKW-LPYMAVHISA-N 1-(dipyridin-2-ylmethylideneamino)-3-[(E)-(2-hydroxyphenyl)methylideneamino]thiourea Chemical compound Oc1ccccc1\C=N\N\C([S-])=[NH+]/N=C(c1ccccn1)c1ccccn1 KJBWWVTTZNVMKW-LPYMAVHISA-N 0.000 description 1
- ZCJJIQHVZCFSGZ-UHFFFAOYSA-N 2,8-bis(diphenylphosphoryl)dibenzothiophene Chemical compound C=1C=CC=CC=1P(C=1C=C2C3=CC(=CC=C3SC2=CC=1)P(=O)(C=1C=CC=CC=1)C=1C=CC=CC=1)(=O)C1=CC=CC=C1 ZCJJIQHVZCFSGZ-UHFFFAOYSA-N 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
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- 229910044991 metal oxide Inorganic materials 0.000 description 1
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- 238000000034 method Methods 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
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Abstract
The invention is a DC power source switching device, which is arranged between a primary power source and a secondary power source and a load end, so as to determine whether the primary power source or the secondary power source supplies current to the load end. The device comprises: a relay, which acts as a switching switch for the primary and secondary power sources; a first diode, which instantaneously supplies current to the load end with the secondary power source when the relay is switched; a second diode, which supplies the instantaneous voltage back to the relay to avoid a relay switch from being blown; a control circuit, which is composed of a voltage test unit to detect the status of the primary power source, moreover, the relay switch to control and switch the position of a relay knife. The circuit structure of the inventive switching device for the DC power sources can guarantee providing power sources with a separate power source, therefore, having extremely high stability in the actual circuit operation.
Description
Technical field
The present invention relates to a kind of DC power switching device, relate in particular to a kind of like this DC power switching device: its change into employing with relay (Relay) as main conducting path, temporary transient afterflow path when diode switches major and minor power supply as relay, after treating that the relay switching is finished, diode promptly is idle state, so just, in the time of can avoiding prior art directly to be conducting path with the diode, its loss of voltage and unsure state are guaranteed for the circuit framework of power to load is provided by single power supply.
Background technology
Continue the importance of supply about the power supply of electronic product, it is very important making it can continue to operate, for example computer server may be administered all production line flow process controls of factory, if produce shutdown because of sudden reason loses electric power, stopping of production line may make company suffer high monetary loss, for taking precautions against this situation, important electronic product is except the supply of general main power source, the necessity that auxiliary power must be set is arranged, see also shown in Figure 1, be general existing two-supply circuit Organization Chart, its main power source (Master) is connected in series diode (D1 separately with auxiliary power (Slave) output, D2) after, be connected to load end again, adjust the output voltage of main power source to such an extent that exceed 0.5V than auxiliary power, when the magnitude of voltage of main power source through D1, be higher than the magnitude of voltage of secondary voltage through D2, promptly provide current to load end by main power source this moment; Otherwise,, then provide current to load end by auxiliary power if main power source, is lower than the magnitude of voltage of secondary voltage through D2 through the magnitude of voltage of D1.
Above-mentioned circuit framework easily causes the loss of input voltage, no matter be to provide current to load by main power source or negative supply, all can lose the forward voltage values (Forward Voltage) of the diode of flowing through, if during with the long-term delivered current of diode, the problem of diode heating often causes the wild effect of circuit on the other hand.In addition, the voltage of main power source and auxiliary power is very approaching, causes the major and minor power supply phenomenon of offered load electric current simultaneously, so just loses the purpose that major and minor power supply is set simultaneously, the above-mentioned defective that is prior art two-supply circuit framework.
Summary of the invention
Based on the defective that solves the above prior art, the invention provides a kind of DC power switching device, main purpose of the present invention is DC power switching device changed and adopts with relay as its main conducting path, diode switches main as relay, temporary transient afterflow path during auxiliary power, after treating that the relay switching is finished, diode promptly is idle state, so just, in the time of can avoiding prior art directly to be conducting path with the diode, its loss of voltage and unsure state, thus the circuit framework of DC power switching device can be guaranteed for providing power to load by single power supply.
For achieving the above object, the invention provides a kind of DC power switching device, it is arranged between major and minor power supply and the load end, changeable major and minor power supply, thus determine which power supply supply of current to load end, it includes:
Relay is in order to as major and minor power change-over switch;
Control circuit, it includes voltage detection unit, in order to the state of detection main power source, and also comprises the relay switch of controlling transfer relay plug-in strip position;
First diode, when switching as relay, by the instantaneous supply of current of auxiliary power to load end; And
Second diode is led back relay with instantaneous voltage, can avoid relay switch is burnt.
Preferably, this relay kind can be one of them of hilted broadsword single head, hilted broadsword double end, double-pole single head, double-pole double end.
Preferably, this relay switch is one of them of bipolar transistor and mos field effect transistor.
Preferably, this bipolar transistor kind be PNP and NPN one of them.
Preferably, this MOS field answer the effect transistor kind be P raceway groove and N raceway groove one of them.
In embodiments of the present invention, this voltage detection unit also includes four kinds of operate conditions: (1) main power source direct voltage output＞threshold voltage; (2) the minimum input voltage of threshold voltage 〉=main power source direct voltage output 〉=voltage detection unit; (3) the minimum input voltage of voltage detection unit＞main power source direct voltage output; (4) auxiliary power direct voltage output＞main power source direct voltage output.
In embodiments of the present invention, this voltage detection unit is made of the voltage detecting integrated circuit.
In embodiments of the present invention, the changeable many groups of this DC power switching device major and minor power supply in parallel.
Preferably, this voltage detection unit for low effectively output (Active Low Output) type and high effectively output (Active High Output) type one of them.
The circuit framework of DC power switching device of the present invention can guarantee when side circuit operates, to have high stability for providing power to load by single power supply.
For further the present invention being had more deep explanation, the present invention is described by the following drawings, figure number explanation and embodiment.
Description of drawings
Fig. 1 is the two-supply circuit Organization Chart of general prior art;
Fig. 2 is the circuit framework schematic diagram of DC power switching device of the present invention;
Fig. 3 is that the control circuit first of DC power switching device is implemented illustration;
Fig. 4 is that the control circuit second of DC power switching device is implemented illustration;
Fig. 5 utilizes the control multi-group power circuit first of DC power switching device to implement illustration;
Fig. 6 utilizes the control multi-group power circuit second of DC power switching device to implement illustration.
Wherein, description of reference numerals is as follows:
D1～first diode
D2～second diode
D3～the 3rd diode
D4～the 4th diode
D5～the 5th diode
R1, R2～build-out resistor
11,21～AC power
12,22～main power source
13,23～auxiliary power
14,24～load end
The output of 231～auxiliary power direct voltage
The output of 232～main power source direct voltage
25～relay
251～suction magnetic coil
26～control circuit
26a～first control circuit
261～voltage detection unit
262～the first transistor
26b～second control circuit
263～voltage detection unit
264～transistor seconds
31,51～the first main power source direct voltages output
32,52～the first auxiliary power direct voltages output
33,53～the second main power source direct voltages output
34,54～the second auxiliary power direct voltages output
35,55～the 3rd main power source direct voltages output
36,56～the 3rd auxiliary power direct voltages output
37,57～the 4th main power source direct voltages output
38,58～the fourth officer power supply direct voltages output
39,59～load end
40,60～relay
401,601～suction magnetic coil
41～first control circuit
411～voltage detection unit
412～the first transistor
61～second control circuit
611～voltage detection unit
612～transistor seconds
Embodiment
Existing conjunction with figs. illustrates detailed structure of the present invention and annexation thereof, in order to understanding.
See also shown in Figure 2, it is the circuit framework schematic diagram of DC power switching device of the present invention, it includes: AC power 21, main power source 22, auxiliary power 23, load end 24, relay 25, two diodes (the first diode D1 and the second diode D2), control circuit 26, please consult (be Fig. 2 and part be shown) shown in Figure 3 simultaneously with frame of broken lines, wherein control circuit 26a also includes voltage detection unit 261 and the first transistor 262, wherein voltage detection unit 261 is made of the voltage detecting integrated circuit, whether not this voltage detection unit 261 can detect main power source action, can control transfer relay 25 plug-in strip positions by the first transistor 262 and inhale magnetic coil 251, its applicable transistor kind includes: mos field effect transistor (P raceway groove/N raceway groove) and bipolar transistor (PNP/NPN) are all applicable, and corresponding different crystal pipe kind, its voltage detection unit is also inequality, include: low effective output type and high effectively output type, and build-out resistor (present embodiment is the voltage detection unit of low effective output type, and R2=100R1) also inequality.When AC power starts, judge via this control circuit 26 whether main power source 22 voltages are higher than the predeterminated voltage value, in the time of if yes, the position of its relay 25 switches remains on the position of N.C, and provides voltage to load end 24 by main power source 22; If in the time of not, the position of these relay 25 switches switches to the position of N.O, and provide voltage to load end 24 by auxiliary power 23, when coming as DC power supply switching and current conduction path with this framework, its relay 25 can bear anti-stream than conventional diode height, and can not produce the problem of the loss and the heating of forward voltage as diode, therefore stability is splendid.
Above-mentioned relay 25 is mainly as major and minor power supply (22,23) diverter switch and current conduction path, and kind can be one of them of hilted broadsword single head (SPST), hilted broadsword double end (SPDT), double-pole single head (DPST), double-pole double end (DPDT); When the first diode D1 switches as relay 25, by auxiliary power 23 instantaneous supply of current to load end 24; And relay 25 produces high pulse voltage in the instantaneous meeting of switching, and the second diode D2 can lead back instantaneous voltage relay 25, can avoid making the first transistor 262 to burn.
Please consult Fig. 3 again, the present invention adopts the voltage detection unit of low effective output type, and its transistor kind be P-channel metal-oxide-semiconductor field-effect transistor and positive-negative-positive bipolar transistor one of them, it has following four kinds of states:
1) main power source direct voltage output (Master Vdc OUT) 232＞threshold voltage (ThresholdVoltage):
Voltage detection unit (Voltage Detection Unit) 261 is output as open circuit (Open), so node Va magnitude of voltage is 0.99* main power source direct voltage output 232, the voltage across poles that will deduct the first transistor 262 greater than auxiliary power direct voltage output (Slave Vdc OUT) 231 (is P Channel:V
SGPNP:V
EB).By above-mentioned interdependent node voltage ratio, so the first transistor 262 not conductings, relay 25 maintains the N.C position, by the main power source supply of current to load end.
2) the minimum input voltage of threshold voltage 〉=main power source direct voltage output 232 〉=voltage detection unit 261:
Voltage detection unit 261 is output as ground connection (Ground), thus node Va magnitude of voltage near 0V, when the first transistor 262 conductings, relay 25 switches to the N.O position, again by the auxiliary power supply of current to load end 24.
When relay 25 switches to the N.O position by N.C, several milliseconds (ms) are arranged approximately, and extremely tens of milliseconds time is in the sky window phase (Unconnected), this moment, auxiliary power continued to provide voltage to load end 24 via diode D1, the phenomenon that therefore can not cause power supply to interrupt for load end 24, but after relay 25 switches to the N.O position, the negative electrode of diode D1 (Cathode) voltage will be greater than anode voltage (Anode) voltage, so diode D1 forms not on-state.
3) the minimum input voltage of voltage detection unit＞main power source direct voltage output:
Main power voltage is if be lower than the minimum input voltage of voltage detecting product unit, and this moment, the output state of voltage detection unit may be open circuit or ground connection one of them (nondeterministic statement).
During open circuit: node Va magnitude of voltage is a 0.99* main power source direct voltage output valve, will be less than auxiliary power direct voltage output, relay 25 switches to the N.O position, again by the auxiliary power supply of current to load end 24.
During ground connection: node Va magnitude of voltage is 0, so the first transistor 262 conductings still are to load end 24 by the auxiliary power supply of current.
4) auxiliary power direct voltage output 232＞main power source direct voltage output 231:
After this circuit framework detects primary source failure, force voltage detection unit 261 action, and relay 25 switches to the N.O position by N.C, main power source still provides current to load end 24 by main power source if do not lose function.
The present invention can be applicable to exchange the output monitoring of conversion direct current, the monitoring that direct voltage inputs or outputs is monitored, organized more to the output of direct current conversion direct current.
See also shown in Figure 4, for the control circuit second of DC power switching device is implemented illustration, the transistor seconds 264 that is control circuit 26b with the difference of Fig. 3 for n channel metal oxide semiconductor field effect transistor and bipolar npn transistor one of them, and adopt the high effectively voltage detection unit 263 of output type, its impedance for matching also slightly variant (only having only R1), by the displacement of simple assemblies, also can reach identical function (control transfer relay plug-in strip position).
See also shown in Figure 5, for the control multi-group power circuit first that utilizes DC power switching device is implemented illustration, it is the instance graph of the major and minor power supply of the many groups of Fig. 4 DC power switching device control, (present embodiment is four groups to the major and minor power supply of wherein many groups, figure number 31～38) and a plurality of diode (D1～D5) is parallel to same relay 40 and load end 39, inhale the characteristic that magnetic coil 401 may command are switched many group switches by relay 40, so may command should many group major and minor power supplys (31～38).
See also shown in Figure 6, for the control multi-group power circuit second that utilizes DC power switching device is implemented illustration, it is the instance graph of the major and minor power supply of the many groups of Fig. 3 DC power switching device control, (present embodiment is four groups to the major and minor power supply of wherein many groups, Reference numeral 51～58) and a plurality of diode (D1～D5) is parallel to same relay 60 and load end 59, switch the characteristics of organizing switches by suction magnetic coil 601 may command of relay 60, so may command should many group major and minor power supplys (51～58) more.
Announcement by above-mentioned Fig. 2 to Fig. 6, can understand main purpose of the present invention be with DC power switching device change into employing with relay as its main conducting path, temporary transient afterflow path when diode switches major and minor power supply as relay, after treating that the relay switching is finished, diode promptly is idle state, so just, in the time of can avoiding prior art directly to be conducting path with the diode, have the loss of voltage and unsure state, so the circuit framework of this DC power switching device can be guaranteed for providing power to load by single power supply.When side circuit operates, has high stability.
In sum, architectural feature of the present invention and each embodiment disclose all in detail, and can fully demonstrate the present invention marked improvement are arranged all on purpose and technique effect.
Yet the above only is preferred embodiment of the present invention, can not be in order to limit scope of the present invention, and promptly all equivalences that drops in the claim scope of the present invention change and revise, and should still belong in protection scope of the present invention.
Claims (9)
1. a DC power switching device is arranged between major and minor power supply and the load end, can switch major and minor power supply, and to determine which power supply supply of current to load end, it includes:
Relay is in order to as major and minor power change-over switch;
Control circuit, it includes voltage detection unit, in order to the state of detection main power source, and also comprises the relay switch of controlling transfer relay plug-in strip position;
First diode is connected between described auxiliary power and the described load end, when relay switches, by the instantaneous supply of current of auxiliary power to load end; And
Second diode oppositely is connected between described auxiliary power and the described control circuit, and the instantaneous voltage that produces when relay is switched is led back relay, burns in order to avoid relay switch.
2. DC power switching device as claimed in claim 1, wherein this relay kind be hilted broadsword single head, hilted broadsword double end, double-pole single head and double-pole double end one of them.
3. DC power switching device as claimed in claim 1, wherein this relay switch be bipolar transistor and mos field effect transistor one of them.
4. DC power switching device as claimed in claim 3, wherein this bipolar transistor kind be PNP and NPN one of them.
5. DC power switching device as claimed in claim 3, wherein this MOS field answer the effect transistor kind be P raceway groove and N raceway groove one of them.
6. DC power switching device as claimed in claim 1, wherein this voltage detection unit also includes four kinds of operate conditions:
(1) when main power source direct voltage output＞threshold voltage, this voltage detection unit is output as open circuit, and described main power source supply of current is to described load end;
(2) when the minimum input voltage of threshold voltage 〉=main power source direct voltage output 〉=voltage detection unit, this voltage detection unit is output as ground connection, and described auxiliary power supply of current is to described load end;
(3) when the minimum input voltage＞main power source direct voltage of voltage detection unit was exported, this voltage detection unit was output as open circuit or ground connection, and described auxiliary power supply of current is to described load end;
(4) when auxiliary power direct voltage output＞main power source direct voltage is exported, force this voltage detection unit action.
7. DC power switching device as claimed in claim 1, wherein this voltage detection unit is made of the voltage detecting integrated circuit.
8. DC power switching device as claimed in claim 1, wherein this DC power switching device can switch many groups major and minor power supply in parallel.
9. DC power switching device as claimed in claim 1, wherein this voltage detection unit for low effective output type and high effectively output type one of them.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2006101498306A CN101170262B (en) | 2006-10-25 | 2006-10-25 | DC power switching device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2006101498306A CN101170262B (en) | 2006-10-25 | 2006-10-25 | DC power switching device |
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| Publication Number | Publication Date |
|---|---|
| CN101170262A CN101170262A (en) | 2008-04-30 |
| CN101170262B true CN101170262B (en) | 2010-06-09 |
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| CN2006101498306A Expired - Fee Related CN101170262B (en) | 2006-10-25 | 2006-10-25 | DC power switching device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8553376B2 (en) * | 2010-12-11 | 2013-10-08 | The Boeing Company | Synchronous rectified PWM regulator with auto fault clearing |
| CN102136755B (en) * | 2011-01-25 | 2013-10-30 | 中国北车集团大连机车车辆有限公司 | Double-unit hot backup direct-current power supply device and railway locomotive |
| CN103095099B (en) * | 2011-10-31 | 2016-02-03 | 英飞特电子（杭州）股份有限公司 | A kind of load driving circuits |
| CN104426237A (en) * | 2013-09-09 | 2015-03-18 | 海洋王（东莞）照明科技有限公司 | Emergency circuit and lamp |
| CN109546739B (en) * | 2017-09-21 | 2022-03-22 | 航天科工惯性技术有限公司 | Dual-power switching system and gyro inclinometer device while drilling with same |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5335263A (en) * | 1991-07-18 | 1994-08-02 | Matsushita Electric Industrial Co., Ltd. | Power supply switching circuit for a compact portable telephone set |
| US5739594A (en) * | 1996-02-07 | 1998-04-14 | Zenith Controls, Inc. | Controller for automatic transfer switches |
| US5894413A (en) * | 1997-01-28 | 1999-04-13 | Sony Corporation | Redundant power supply switchover circuit |
| US6330176B1 (en) * | 2000-11-15 | 2001-12-11 | Powerware Corporation | Multi-input power transfer and uninterruptible power supply apparatus and methods of operation thereof |
| CN2591841Y (en) * | 2002-12-16 | 2003-12-10 | 江苏省电力公司镇江供电公司 | Intelligent double-electric power supply changover apparatus |
-
2006
- 2006-10-25 CN CN2006101498306A patent/CN101170262B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5335263A (en) * | 1991-07-18 | 1994-08-02 | Matsushita Electric Industrial Co., Ltd. | Power supply switching circuit for a compact portable telephone set |
| US5739594A (en) * | 1996-02-07 | 1998-04-14 | Zenith Controls, Inc. | Controller for automatic transfer switches |
| US5894413A (en) * | 1997-01-28 | 1999-04-13 | Sony Corporation | Redundant power supply switchover circuit |
| US6330176B1 (en) * | 2000-11-15 | 2001-12-11 | Powerware Corporation | Multi-input power transfer and uninterruptible power supply apparatus and methods of operation thereof |
| CN2591841Y (en) * | 2002-12-16 | 2003-12-10 | 江苏省电力公司镇江供电公司 | Intelligent double-electric power supply changover apparatus |
Non-Patent Citations (4)
| Title |
|---|
| JP特开2005-192372A 2005.07.14 |
| JP特开2005-20965A 2005.01.20 |
| JP特开2006-204061A 2006.08.03 |
| JP特开平10-336912A 1998.12.18 |
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