CN206099298U - Power supply monitoring circuit - Google Patents
Power supply monitoring circuit Download PDFInfo
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- CN206099298U CN206099298U CN201621137402.7U CN201621137402U CN206099298U CN 206099298 U CN206099298 U CN 206099298U CN 201621137402 U CN201621137402 U CN 201621137402U CN 206099298 U CN206099298 U CN 206099298U
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- 238000012544 monitoring process Methods 0.000 title abstract description 6
- 238000001514 detection method Methods 0.000 claims abstract description 15
- 238000005070 sampling Methods 0.000 claims abstract description 13
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- 238000004804 winding Methods 0.000 claims description 23
- 230000005611 electricity Effects 0.000 claims description 10
- 239000003990 capacitor Substances 0.000 claims description 5
- 238000006243 chemical reaction Methods 0.000 claims description 5
- 239000004020 conductor Substances 0.000 claims description 4
- 238000001914 filtration Methods 0.000 claims description 4
- 238000005259 measurement Methods 0.000 claims description 4
- 230000007935 neutral effect Effects 0.000 claims description 4
- 230000001568 sexual effect Effects 0.000 abstract 1
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Abstract
The utility model relates to a power supply monitoring circuit, including mains power supply unit, system voltage translation unit, protection voltage sampling unit, fault detection unit, protection pedestal generator, warning output unit, power supply output unit, wherein system voltage translation unit includes three transformers that all possess a translation unit 1 and the 2nd translation unit 1. The utility model relates to a suitability is strong, powerful, and the price is lower, and the less three -phase power supply monitoring circuit of volume can realize three phase current's function such as open -phase protection, overvoltage protection, undervoltage protection, voltage unbalance protection. Have characteristics such as easy and simple to handle, small in size, reliability height, the operate time of protection who lacks looks is lighter than 0.1 second, and the tachypragia is reliable, the sexual valence relative altitude, and application scope is wide.
Description
Technical field
The utility model is related to Power Supply Monitoring protection field, and in particular to a kind of power supply supervisory circuit.
Background technology
Threephase load such as threephase motor occasionally lacks in operation a certain phase, and motor continues to operation, and such three get along
In non-equilibrium state, motor will burn out because overheated；Three phase frequency changing power input power phase shortage or power supply mistake in operation
It is under-voltage, power source bus will be caused to reduce or raise, IGBT constant power devices excessively stream is generated heat or excessive pressure damages, and system power supply heating is damaged
The anomaly such as bad.Therefore threephase load is required for possessing the functions such as default-phase protection function, input overvoltage/undervoltage protection.In the same manner, it is single
Phase load or single-phase variable-frequency power sources, dc source there is also the detection protection demand of input overvoltage/undervoltage.
As shown in figure 8, at present existing open-phase protection circuit is mainly A, B, C three-phase by this 9 electricity of R101～R109
Resistance, forms one group of balancing circuitry, and is compared with N line voltages, carries out halfwave rectifier by diode D23, it is ensured that optocoupler U17
Input voltage for just；When be input into it is normal when, the balance of voltage, optocoupler U17 is failure to actuate, pin U17-3 be low level, comparator
U13B is output as low level, does not report to the police；When input phase failure, unbalanced power supply, optocoupler U17 actions, pin U17-3 is high electricity
Flat, comparator U13B is output as high level, output alarm signal；Due to using switching devices such as optocouplers, realizing that phase shortage is protected
Shield, severe three-phase unbalance protection, it is impossible to realize that overvoltage/undervoltage is protected.
At present, simple open-phase protection circuit can realize phase shortage or unbalance protection, but cannot realize overvoltage/undervoltage
Protection, and when being applied to variable-frequency power sources inside, need external dc power supply to power, it is impossible to the detection protection in realization before electricity,
Easily cause protection it is inconsistent, there are problems that the voltage scope of application is less；And improved open-phase protection plate is due to principle or work
The problem of skill, reliability is relatively low；Also have using the method for detection waveform on market, but there is interference, overvoltage/undervoltage cannot be realized
The shortcomings of protection, and price is universal higher.
The content of the invention
For the problems referred to above, the utility model provides a kind of collection open-phase protection, overvoltage/undervoltage protection, sound and light alarm display function
Protection circuit is monitored in integrated power supply.
To solve the above problems, the technical scheme that the utility model is taken is：A kind of power supply supervisory circuit, including system confession
Electric unit, system voltage converting unit, protection voltage sampling unit, fault detection unit, protection pedestal generator, warning
Output unit, power supply output unit, wherein system voltage converting unit are provided with the first secondary windings and including three
The transformer of secondary stage winding, three the first secondary windings are that system power supply winding is in parallel for system confession after rectifier bridge respectively
Electric unit is powered, and three second subprime windings are that sampled measurements winding distinguishes the monitored letter of output Jing after protection voltage sampling unit
Number, monitored signal is input into jointly with the overvoltage protection a reference value, under-voltage protection a reference value of protecting pedestal generator to produce
Fault detection unit, fault detection unit produces protection signal, protection signal input alarm output unit and power supply output
Unit.When any phase phase shortage or overvoltage/undervoltage, three the first secondary windings co-production after rectifier bridge respectively can be ensured
Raw conversion voltage maintains protection system normal work in operating voltage range.
Described SPU includes a Switching Power Supply, and its input is input into three the first secondary windings and passes through respectively
The conversion voltage of Parallel opertation after rectifier bridge, its output end output supply voltage.The utility model opening using wide input range
Close class power supply apparatus and replace linear voltage-stabilizing circuit.
Described protection voltage sampling unit includes the identical sample circuit of three-phase, and specially second subprime winding passes through rectification
It is last filtered by the virtual value that voltage commutation is half waveform and then the double T rejector circuits output sampled voltages of Jing after bridge
Monitored signal is exported after capacitor filtering.
Described protection pedestal generator includes the quasi- power supply chip of one or three end groups, and the quasi- power supply chip of three end groups was produced
Pressure protection a reference value and under-voltage protection a reference value.The reference voltage value of the quasi- power supply chip of three end groups is 2.5V, and precision 1% can be with
Meet the demand of protection circuit；According to actual overvoltage, the demand of under-voltage protection value, connected by the quasi- power supply chip of adjustment and three end groups
The resistance for connecing realizes the regulation of protection reference value, enhances the flexibility of circuit design.
Described fault detection unit includes three mutually identical comparing units, and specially each comparing unit includes two groups of ratios
Compared with device；Monitored signal is input into respectively the high level input of the low-level input of first group of comparator and second group of comparator
End, first group of comparator high level input is input into the quasi- power supply chip of three end groups and produces overvoltage protection a reference value, described
First group of comparator low-level input is input into the quasi- power supply chip of three end groups and produces under-voltage protection a reference value；Six groups of comparators it is defeated
Go out Jing with gate circuit and filter after drive triode, the colelctor electrode output protection signal of triode.
Described alarm output unit includes buzzer alarm circuit and indicator lamp warning circuit.
Described power supply output unit is specially：Protection signal is input into transistor base, and transistor collector is connected to
Relay coil, relay is used for whether control wherein phase voltage output to constitute loop with neutral conductor line.
The utility model is a kind of strong applicability, and powerful, price is relatively low, the three phase mains monitoring electricity of small volume
Road, can realize the functions such as open-phase protection, overvoltage protection, under-voltage protection, the Voltage unbalance protection of three phase mains.With operation
The features such as simplicity, compact, high reliability, the operating time of protection of phase shortage is less than 0.1 second, and action is quick, reliable, cost performance
Height, it is applied widely.
Description of the drawings
Fig. 1 is SPU circuit diagram；
Fig. 2 is system voltage converting unit and protection voltage sampling unit circuit diagram；
Fig. 3 is fault detection unit circuit diagram；
Fig. 4 is protection benchmark voltage generator circuit figure；
Fig. 5 is buzzer alarm circuit figure；
Fig. 6 is indicator lamp warning circuit figure；
Fig. 7 is power supply output unit circuit diagram；
Fig. 8 is existing open-phase protection circuit figure.
Specific embodiment
A kind of power supply supervisory circuit, including SPU, system voltage converting unit, protection voltage sampling unit,
Fault detection unit, protection pedestal generator, alarm output unit, power supply output unit, wherein as shown in Fig. 2
System voltage converting unit includes three transformer T1, T2, T3 for being provided with the first secondary windings and second subprime winding, three
First secondary windings is that respectively the Parallel opertation after rectifier bridge B1, B3, B5 changes voltage ZL+ into system confession to system power supply winding
Electric unit is powered, and three second subprime windings are that sampled measurements winding distinguishes the monitored letter of output Jing after protection voltage sampling unit
Number UINA, UINB, UINC, the overvoltage protection base that signal UINA, UINB, the UINC that be monitored is produced with protection pedestal generator
Quasi- value, the common input fault detector unit of under-voltage protection a reference value, fault detection unit produces protection signal BH, protection signal BH
Input alarm output unit and power supply output unit.Described protection voltage sampling unit includes the identical sampling electricity of three-phase
Road, by taking A-B phases as an example, it is the waveforms of 100Hz half that 7V voltages first pass around rectifier bridge B2 rectifications, and Jing electric capacity C19 is filtered, and rear class is
Double T rejector circuits of R21, R22, R24, R25, C16, C18, C21, C22 composition, are output as the effective of sampled measurements voltage
Value, after electric capacity C20 filtering, the monitored signal UINA of output smoothing.B-C phases, A-C phase operation principles are identical with A-B, defeated
Go out smooth monitored signal UINB, UINC.
As shown in figure 1, described SPU includes Switching Power Supply U1, its Gnd end, on/off ends are grounded, its
Input is input into the conversion voltage ZL+ of Parallel opertation simultaneously two parallel connections of Jing by rectifier bridge after respectively of three the first secondary windings
Electric capacity C2 and electric capacity C3 is grounded, its Fback ends Jing electric capacity C4 ground connection, the simultaneously Jing inductance L1 outputs of its output end Jing diode D3 ground connection
12V supply voltages, electric capacity C4, electric capacity C5 ground connection inductance L1 Jing in parallel.
As shown in figure 4, described protection benchmark voltage generator body is：The 12V of SPU output powers electricity
Resistance R11, resistance R12, resistance R13 ground connection that pressure is concatenated, the ANODE ends ground connection of the quasi- power supply chip S2 of three end groups, REF terminations
To resistance R16, resistance that between resistance R12, resistance R13, CATHODE ends are connected between resistance R11, resistance R12 and are concatenated
R17 is grounded.The XX ends of the quasi- power supply chip S2 of wherein three end groups take overvoltage protection a reference value 8.4V, between resistance R16, resistance R17
Take under-voltage protection a reference value 5.6V.It is electric by adjusting R12, R13, R16, R17 according to actual overvoltage, the demand of under-voltage protection value
The regulation of protection reference value is realized in resistance, enhances the flexibility of circuit design.
As shown in figure 3, described fault detection unit includes three mutually identical comparing unit IC1, IC2, IC3, specially
Each comparing unit is respectively comprising two groups of comparators：IC1A、IC1B、IC2A、IC2B、IC3A、IC3B；With the signal that is monitored
As a example by UINA, monitored signal UINA is input into respectively the height electricity of the low-level input of first group of comparator and second group of comparator
Flat input, first group of comparator high level input is input into the quasi- power supply chip S2 of three end groups and produces overvoltage protection a reference value
8.4V, first group of described comparator low-level input is input into the quasi- power supply chip S2 of three end groups and produces under-voltage protection a reference value
5.6V；The output end of six groups of comparators is connected to light emitting diode and via diode D4, diode D5, diode D6, two poles
What pipe D7, diode D8, diode D9, resistance R19 were constituted simultaneously drives with gate circuit Jing after resistance R20 filter capacitors C17 filtering
The colelctor electrode output protection signal BH of triode N4, triode N4.
When input voltage UA-B, UB-C, UA-C are in the range of normal working voltage, at UINA, UINB, UINC amplitude
Between 5.6V～8.4V, comparator output is high level；When the phase in input voltage UA-B, UB-C, UA-C, two-phase or
When three-phase voltage is higher than rated voltage 20%, be monitored signal UINA, UINB, UINC are raised, and during more than 8.4V, can be caused and be compared
First group of comparator action of unit IC1, IC2, IC3, low-level input voltage is higher than high level input terminal voltage, and output is believed
Number upset becomes low level output, so as to be output as low level with gate circuit, if the time is shorter or only level interference, and low electricity
The filter circuit that ordinary mail number can be constituted by resistance R20, filter capacitor C17 absorbs, so as to avoid causing misoperation, if sent out really
Life is over-pressed, then the base level step-down of triode N4, the colelctor electrode carry-out bit high level of triode N4, so as to drive the report of rear class
Alert circuit；Meanwhile, when first group of comparator output terminal is low level, the conducting of LED 1, LED3, LED5 is lighted, and is sent out
Go out over-pressed Warning Mark.
When the phase in input voltage UA-B, UB-C, UA-C, two-phase or three-phase voltage are less than rated voltage 20%, quilt
Monitoring signal UINA, UINB, UINC are reduced, and during less than 5.6V, can cause second group of comparator of comparing unit IC1, IC2, IC3
Action, low-level input voltage be higher than high level input terminal voltage, output signal upset become low level output, so as to door
Circuit output is low level, if the time is shorter or only level is disturbed, low level signal can be by resistance R20, filter capacitor C17
The filter circuit of composition absorbs, and so as to avoid causing misoperation, if there is overvoltage really, the base level of triode N4 becomes
It is low, the colelctor electrode carry-out bit high level of triode N4, so as to drive the warning circuit of rear class；Meanwhile, second group of comparator output
Hold for low level when, LED 2, LED4, LED6 conducting light, send under-voltage Warning Mark.
When input power phase shortage or imbalance, voltage will occur power down or voltage in input voltage UA-B, UB-C, UA-C
Skew, so as to trigger fault alarm.
Described alarm output unit includes buzzer alarm circuit and indicator lamp warning circuit.Described power supply is defeated
Go out unit to be specially：Protection signal is input into transistor base, and transistor collector is connected to relay coil, and relay is used to control
A wherein phase voltage exports whether constitute loop with neutral conductor line.
When input power source abnormality, circuit will send sound and light alarm signal, and power supply output disconnects, as shown in figure 5, protecting
The high level of shield signal BH drives triode N1, triode N1 conductings, buzzer LS1 to send alarm sound through resistance R4；Such as
Shown in Fig. 6, the high level of protection signal BH signal drives triode N2, triode N2 conductings, red alarm to refer to through resistance R6
Show that lamp is lighted, send warning light；As shown in fig. 7, the high level of protection signal BH cannot drive triode N3, so as to relay
JD1 is failure to actuate, and B phases are pressed and are cut off and cannot export, system power supply power-off；Simultaneously LED 7 refers to as the actuating of relay
Show lamp, also extinguish therewith；
When power input is normal, load end is arrived in normal circuit operation, power supply output, as shown in figure 5, protection signal
BH is low level, and triode N1, triode N2 are turned off, buzzer LS1 stop alarm sound；Red alarm indicator lamp extinguishes；Protect
The low level of shield signal BH drives triode N3, triode N3 conductings, so as to relay JD1 actions, B phase voltages by resistance R7
Output constitutes loop with neutral conductor N lines, system power supply power supply is provided for alternating current and direct current power-supply device, while light emitting diode
LED7 is also lighted therewith as actuating of relay indicator lamp, is maintained easily and is overhauled.
Claims (6)
1. a kind of power supply supervisory circuit, it is characterised in that：Including SPU, system voltage converting unit, protection voltage
Sampling unit, fault detection unit, protection pedestal generator, alarm output unit, power supply output unit, wherein being
System voltage conversion unit includes three transformers for being provided with the first secondary windings and second subprime winding, three first levels around
Group for system power supply winding, respectively for SPU power after rectifier bridge by parallel connection, and three second subprime windings are sampling
Measurement winding difference monitored signal of output Jing after protection voltage sampling unit, be monitored signal and protection pedestal generator
The common input fault detector unit of the overvoltage protection a reference value of generation, under-voltage protection a reference value, fault detection unit produces protection
Signal, protection signal input alarm output unit and power supply output unit.
2. power supply supervisory circuit according to claim 1, it is characterised in that：Described SPU includes a switch
Power supply, its input be input into three first secondary windings respectively after rectifier bridge Parallel opertation conversion voltage, its output end
Output supply voltage.
3. power supply supervisory circuit according to claim 1 and 2, it is characterised in that：Described protection voltage sampling unit bag
The identical sample circuit of three-phase is included, voltage commutation is that half waveform and then Jing are double after rectifier bridge by specially second subprime winding
T rejector circuits export the virtual value of sampled voltage, the monitored signal of output after last filtered capacitor filtering.
4. power supply supervisory circuit according to claim 3, it is characterised in that：Described protection pedestal generator includes
The quasi- power supply chip of one or three end groups, the quasi- power supply chip of three end groups produces overvoltage protection a reference value and under-voltage protection a reference value.
5. power supply supervisory circuit according to claim 4, it is characterised in that：Described fault detection unit includes three phases
Identical comparing unit, specially each comparing unit include two groups of comparators；Monitored signal is input into respectively first group of comparator
Low-level input and second group of comparator high level input, first group of comparator high level input input three
The quasi- power supply chip of end group produces overvoltage protection a reference value, and first group of described comparator low-level input is input into the quasi- electricity of three end groups
Source chip produces under-voltage protection a reference value；The output of six groups of comparators Jing with gate circuit and filter after drive triode, triode
Colelctor electrode output protection signal.
6. power supply supervisory circuit according to claim 5, it is characterised in that：Described power supply output unit is concrete
For：Protection signal is input into transistor base, and transistor collector is connected to relay coil, and relay is used for the mutually electricity of control wherein one
Whether pressure output constitutes loop with neutral conductor line.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621137402.7U CN206099298U (en) | 2016-10-19 | 2016-10-19 | Power supply monitoring circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621137402.7U CN206099298U (en) | 2016-10-19 | 2016-10-19 | Power supply monitoring circuit |
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| Publication Number | Publication Date |
|---|---|
| CN206099298U true CN206099298U (en) | 2017-04-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621137402.7U Active CN206099298U (en) | 2016-10-19 | 2016-10-19 | Power supply monitoring circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111965422A (en) * | 2020-07-22 | 2020-11-20 | 一巨自动化装备（上海）有限公司 | Frequency monitoring circuit |
| CN113488961A (en) * | 2021-08-03 | 2021-10-08 | 广东友电新能源科技有限公司 | Over-voltage and under-voltage protection circuit and over-voltage and under-voltage protection device |
-
2016
- 2016-10-19 CN CN201621137402.7U patent/CN206099298U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111965422A (en) * | 2020-07-22 | 2020-11-20 | 一巨自动化装备（上海）有限公司 | Frequency monitoring circuit |
| CN113488961A (en) * | 2021-08-03 | 2021-10-08 | 广东友电新能源科技有限公司 | Over-voltage and under-voltage protection circuit and over-voltage and under-voltage protection device |
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Effective date of registration: 20231025 Address after: Room 302, No. 1069, Gangxing 3rd Road, Export Processing Zone, High-tech Zone, Jinan, Shandong Province, 250000 Patentee after: Shandong Ainuo Intelligent Instrument Co.,Ltd. Address before: No. 1069, Gangxing Third Road, export processing zone, hi tech Zone, Jinan City, Shandong Province Patentee before: SHANDONG AINUO INSTRUMENT Co.,Ltd. |