CN208314063U - A kind of Switching Power Supply wide scope input undervoltage detection circuit - Google Patents
A kind of Switching Power Supply wide scope input undervoltage detection circuit Download PDFInfo
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- CN208314063U CN208314063U CN201820875375.6U CN201820875375U CN208314063U CN 208314063 U CN208314063 U CN 208314063U CN 201820875375 U CN201820875375 U CN 201820875375U CN 208314063 U CN208314063 U CN 208314063U
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Abstract
The utility model discloses a kind of Switching Power Supply wide scope input undervoltage detection circuits, it is related to exchanging power detection circuit, it solves when carry out under-voltage detection every time, need to carry the problem of two kinds of input undervoltage detection circuits detect the alternating current of different voltages, its key points of the technical solution are that: the photovoltaic conversion device including being coupled to alternating current and output voltage inverted signal, the switching device for being coupled to photovoltaic conversion device and being switched over according to alternating current voltage size, photovoltaic conversion device is coupled to receive voltage inverted signal and export the comparison unit of comparison signal, comparison unit is coupled to receive comparison signal and export the control device of control signal, control device is coupled to receive control signal and realize the instruction device of instruction in response to control signal, a kind of Switching Power Supply wide scope input undervoltage of the utility model is examined Slowdown monitoring circuit is detected by under-voltage condition of the switching device to input AC electricity, improves the detectability of input undervoltage detection circuit.
Description
Technical field
The utility model relates to exchange power detection circuit, in particular to a kind of Switching Power Supply wide scope input undervoltage detection electricity
Road.
Background technique
If over-voltage occurs in off-line type alternating current, the work that will affect load even reduces the service life of load；If
When occurring under-voltage, the output voltage and output power of off-line type alternating current are influenced, influences the work of load.
A big chunk Off-line SMPS is suitable for global voltage range alternating current (120Vac, 240Vac) at present
Work, but the detection circuit of input undervoltage does the detection of input undervoltage just for 120Vac or 240Vac, therefore detection every time
When, it needs to carry two kinds of voltage check devices and the alternating current of different voltages is detected, there is room for improvement.
Utility model content
The purpose of the utility model is to provide a kind of Switching Power Supply wide scope input undervoltage detection circuits, pass through switching device
The under-voltage condition of input AC electricity is detected, the detectability of input undervoltage detection circuit is improved.
The above-mentioned technical purpose of the utility model has the technical scheme that
A kind of Switching Power Supply wide scope input undervoltage detection circuit, it is characterized in that: including being coupled to alternating current and exporting electricity
The photovoltaic conversion device for pressing inverted signal, the switching for being coupled to photovoltaic conversion device and being switched over according to alternating current voltage size
Device is coupled to photovoltaic conversion device to receive voltage inverted signal and export the comparison unit of comparison signal, for comparing
Device provides the standard apparatus of reference signal, is coupled to comparison unit to receive comparison signal and export the control dress of control signal
It sets, be coupled to control device to receive control signal and realize the instruction device of instruction in response to control signal；
Voltage inverted signal is less than reference signal, and instruction device is indicated；Otherwise instruction device does not work.
Using the above scheme, by the setting of photovoltaic conversion device, the voltage of alternating current is converted into voltage inverted signal,
The setting of switching device simultaneously carries out the switching of detection gear according to the difference of alternating current voltage, improves input undervoltage detection
The detectability of circuit；
The setting of standard apparatus and comparison unit, once voltage inverted signal is less than reference signal, instruction device is referred to
Show, it is practical so that people check.
By the setting of fairing, alternating current is rectified, to be converted to direct current, while not according to voltage
Together, the switching of detection gear, under-voltage detection device and the setting for dividing detection device are carried out by bleeder mechanism and switching device,
Under-voltage and partial pressure state is detected, and is controlled by under-voltage control device with pressure control device is crossed, finally by
Instruction device is indicated, practical so that people check.
Preferably, the photovoltaic conversion device includes being coupled to the alternating current of different model and exporting corresponding rectification letter
Number rectification circuit, be coupled to rectification circuit for filtering filter circuit, be coupled to rectification circuit to receive rectified signal simultaneously
The bleeder circuit of output voltage inverted signal.
Using the above scheme, by the setting of rectification circuit, alternating current is rectified, to be converted to direct current；Point
The voltage of direct current is converted voltage inverted signal by the setting of volt circuit, convenient for voltage inverted signal and reference signal into
Row compares.
Preferably, the comparison unit includes being coupled to photovoltaic conversion device to receive voltage inverted signal and export ratio
Compared with signal hysteresis comparator circuit, be coupled to the feed circuit of hysteresis comparator circuit.
Using the above scheme, hysteresis comparator circuit realizes voltage inverted signal compared with reference signal；Feed circuit
Setting, so that the voltage inverted signal that comparison circuit is inputted is insensitive near reference signal, so as to avoid input terminal electricity
The problem of pressing inverted signal, slightly the rustle of leaves in the wind that output end just overturns " oscillation " phenomenon, avoids false triggering.
Preferably, alternating current wide scope input undervoltage detection circuit further includes being coupled to hysteresis comparator circuit and for protecting
Protect the clamp device of hysteresis comparator circuit.
Using the above scheme, clamp device make comparator N1 normal phase input end and inverting input terminal voltage clamping in
0.7V is hereinafter, play the role of protecting hysteresis comparator circuit.
Preferably, the standard apparatus include provide reference signal for volt circuit, be coupled to reinforce for volt circuit it is steady
The auxiliary circuit of pressure.
Using the above scheme, reference signal is provided for comparison unit for volt circuit, voltage regulator circuit is for stablizing for volt circuit
Output voltage, auxiliary circuit are mainly used for eliminating low-frequency voltage fluctuation, reinforce voltage regulation result.
Preferably, the control device includes being coupled to comparison unit to receive comparison signal and export trigger signal
Trigger circuit is coupled to trigger circuit to receive trigger signal and export the control circuit of control signal.
Using the above scheme, it when trigger circuit receives the comparison signal of high level, will be connected at once, speed is connected
Fastly, while cooperating the setting of control circuit, instruction device will be directly controlled, it is high-efficient, practical.
Preferably, the control device further includes being coupled to control circuit and for protecting the first of control circuit to protect
Circuit.
Using the above scheme, control circuit namely electromagnetic relay can generate the reversed electronic of very big voltage when power is off
Gesture, the first protection circuit is protected as afterflow to be used, and is absorbed the self induction voltage of electromagnetic relay coil, is protected electromagnetic relay,
It is practical.
Preferably, the instruction device includes being coupled to control device to receive control signal and in response to controlling signal
To realize the indicating circuit for indicating and being made of single light emitting diode, be coupled to indicating circuit and for protecting indicating circuit
Second protection circuit.
It using the above scheme, is lamplight pointing by the indicating circuit of light emitting diode formed, lamplight pointing is compared to sound
Sound instruction avoids the problem that noise；
Since the electric current that light emitting diode is allowed to flow through is smaller, the second protection circuit is depressured, and then avoids flowing through
The electric current of light emitting diode excessive the problem of burning light emitting diode.
In conclusion the utility model has the following beneficial effects:
1, by the setting of photovoltaic conversion device, the voltage of alternating current is converted into voltage inverted signal, while switching dress
The setting set carries out the switching of detection gear according to the difference of alternating current voltage, improves the detection of input undervoltage detection circuit
Ability；
2, the setting of standard apparatus and comparison unit, once voltage inverted signal is greater than reference signal, instruction device is carried out
Instruction, it is practical so that people check.
Detailed description of the invention
Fig. 1 is the circuit diagram one in the present embodiment；
Fig. 2 is the circuit diagram two in the present embodiment.
In figure；1, photovoltaic conversion device；11, rectification circuit；12, filter circuit；13, bleeder circuit；2, switching device；3,
Comparison unit；31, hysteresis comparator circuit；32, feed circuit；4, standard apparatus；41, for volt circuit；42, auxiliary circuit；5, it controls
Device processed；51, trigger circuit；52, control circuit；53, the first protection circuit；6, instruction device；61, indicating circuit；62, second
Protect circuit；7, clamp device.
Specific embodiment
The utility model is described in further detail below in conjunction with attached drawing 1-2.
As shown in Figure 1 and Figure 2, a kind of Switching Power Supply wide scope input undervoltage detection circuit disclosed in the present embodiment, including electricity
Press reforming unit 1, switching device 2, comparison unit 3, standard apparatus 4, control device 5, instruction device 6, clamp device 7.
As shown in Figure 1, photovoltaic conversion device 1 includes rectification circuit 11, filter circuit 12, bleeder circuit 13.Rectification circuit
11 include diode D1, diode D2；Filter circuit 12 is capacitor C1；Bleeder circuit 13 includes resistance R1, resistance R2, resistance
R3, resistance R4, resistance R5.Switching device 2 is switch S1, and switch S1 is button switch.
As shown in Figure 1, the anode of diode D1 is connect with zero curve N, the anode of diode D2 is connect with firewire L, diode
The cathode of D1 is connect with one end of the cathode of diode D2, resistance R1, and the other end of resistance R1 is connect with one end of resistance R2, electricity
The other end of resistance R2 is connect with one end of one end of resistance R3, resistance R5 respectively, the other end of resistance R3 and one end of switch S1
Connection, the other end of switch S1 connect with one end of resistance R4, the other end of resistance R4 respectively with one end of resistance R5, capacitor C1
One end connection.The other end of capacitor C1 is connect with one end of one end of resistance R5, one end of resistance R3, resistance R2 respectively.
As shown in Figure 1, standard apparatus 4 includes for volt circuit 41, auxiliary circuit 42.For volt circuit 41 including resistance R6 and simultaneously
Join integrated regulator Z1, and parallel voltage-stabilizing integrated circuit Z1 provides the reference voltage of 2.5V；Auxiliary circuit is capacitor C2.Compare
Device 3 includes hysteresis comparator circuit 31, feed circuit 32, and hysteresis comparator circuit 31 is operational amplifier N1, and operational amplifier
N1 model LM358, feed circuit 32 are resistance R9.Clamp device 7 includes diode D3, diode D4.
As shown in Figure 1, resistance R6 connects with parallel voltage-stabilizing integrated circuit Z1, one end of resistance R6 is connect with power supply VCC, electricity
The other end of resistance R6 is connect with the cathode of parallel voltage-stabilizing integrated circuit Z1, and the anode of parallel voltage-stabilizing integrated circuit Z1 is with capacitor C2's
One end connection, the other end of capacitor C2 are connect with one end of one end of resistance R6, resistance R7 respectively, the other end and fortune of resistance R7
Calculate the in-phase end connection of amplifier N1；One end of resistance R8 respectively with one end of capacitor C1, one end of resistance R5, resistance R3 one
One end connection at end, resistance R2, the other end of resistance R8 are connect with the reverse side of operational amplifier N1；Diode D3 and diode
D4 is in parallel, and the anode of diode D3 is connect with operational amplifier N1 in-phase end, and the cathode of diode D3 is with operational amplifier N1's
Reverse side connection；One end of resistance R9 is connect with the reverse side of operational amplifier N1, the other end and operational amplifier of resistance R9
The in-phase end of N1 connects, and the ground terminal of operational amplifier N1 is connect with ground GND, the power connection end and power supply VCC of operational amplifier N1
Connection.
When 120Vac is inputted, S1 is opened, and alternating current is rectified by diode D1, D2, resistance R1, resistance R2, resistance R3, electricity
It hinders R5 and constitutes series connection bleeder circuit 13, DC low-voltage, final output voltage inverted signal are converted by ac high-voltage, if voltage turns
Change signal and be less than the reference signal that 2.5V is provided, operational amplifier N1 exports high level, otherwise operational amplifier N1 exports low electricity
It is flat.
When 240Vac is inputted, S1 closure, alternating current is rectified by diode D1, D2, resistance R1, resistance R2, resistance R3, electricity
It hinders R4//resistance R5 and constitutes bleeder circuit 13 in parallel, convert DC low-voltage for ac high-voltage, final output voltage inverted signal,
If voltage inverted signal is less than the reference signal that 2.5V is provided, operational amplifier N1 exports high level, operational amplifier N1 on the contrary
Export low level.
As shown in Fig. 2, control device 5 includes that control circuit 52, first protects circuit 53, trigger circuit 51.Trigger circuit
51 include triode Q1 and resistance R10, and triode Q1 is the triode and model PMBT2222A of NPN type, trigger circuit 51
For relay KA1, the first protection circuit 53 is diode D5.
As shown in Figure 1 and Figure 2, the output end of operational amplifier N1 is connect with one end of resistance R10, the other end of resistance R10
It is connect with the base stage of triode Q1, the emitter of triode Q1 is connect with ground GND.One end of relay KA1 respectively with triode
The anode connection of the collector, diode D1 of Q1, the other end of relay KA1 connect with the cathode of power supply VCC, diode D1 respectively
It connects.
As shown in Fig. 2, instruction device 6 includes that indicating circuit 61, second protects circuit 62, indicating circuit 61 is light-emitting diodes
Pipe LED, the second protection circuit 62 is resistance R11.One end of the normally opened contact KA1-1 of one end and relay of resistance R11 connects,
The other end of resistance R11 and the anode of Light-emitting diode LED connect, and the cathode of Light-emitting diode LED is connect with GND, relay
The other end of normally opened contact KA1-1 connect with power supply VCC.
When the signal of operational amplifier N1 output high level, triode Q1 conducting, relay KA1 obtains electric, light-emitting diodes
Pipe LED operation；When operational amplifier N1 exports low level signal, triode Q1 is not turned on, while relay KA1 must not
Electricity, Light-emitting diode LED do not work.
The course of work:
1, when 120Vac is inputted, S1 is opened, if Light-emitting diode LED works, then it represents that it is under-voltage, on the contrary the circuit is not
Under-voltage condition；
2, when 240Vac is inputted, S1 is closed, if Light-emitting diode LED works, then it represents that it is under-voltage, on the contrary the circuit is not
Under-voltage condition.
This specific embodiment is only the explanation to the utility model, is not limitations of the present invention, ability
Field technique personnel can according to need the modification that not creative contribution is made to the present embodiment after reading this specification, but
As long as all by the protection of Patent Law in the scope of the claims of the utility model.
Claims (8)
1. a kind of Switching Power Supply wide scope input undervoltage detection circuit, it is characterized in that: including being coupled to alternating current and output voltage
The photovoltaic conversion device (1) of inverted signal is coupled to photovoltaic conversion device (1) and is switched over according to alternating current voltage size
Switching device (2) is coupled to photovoltaic conversion device (1) to receive voltage inverted signal and export the comparison unit of comparison signal
(3), compare letter for providing the standard apparatus (4) of reference signal to comparison unit (3), being coupled to comparison unit (3) to receive
Number and export control signal control device (5), be coupled to control device (5) with receive control signal and in response to control signal
To realize the instruction device (6) of instruction；
Voltage inverted signal is less than reference signal, and instruction device (6) is indicated；Otherwise instruction device (6) does not work.
2. a kind of Switching Power Supply wide scope input undervoltage detection circuit according to claim 1, it is characterized in that: the voltage
Reforming unit (1) includes being coupled to the alternating current of different model and exporting the rectification circuit (11) of corresponding rectified signal, coupling
The filter circuit (12) of filtering is used in rectification circuit (11), is coupled to rectification circuit (11) to receive rectified signal and export electricity
Press the bleeder circuit (13) of inverted signal.
3. a kind of Switching Power Supply wide scope input undervoltage detection circuit according to claim 1, it is characterized in that: the comparison
Device (3) includes being coupled to photovoltaic conversion device (1) to receive voltage inverted signal and export the sluggish more electric of comparison signal
Road (31), the feed circuit (32) for being coupled to hysteresis comparator circuit (31).
4. a kind of Switching Power Supply wide scope input undervoltage detection circuit according to claim 3, it is characterized in that: alternating current is wide
Range input undervoltage detection circuit further includes being coupled to hysteresis comparator circuit (31) and for protecting hysteresis comparator circuit (31)
Clamp device (7).
5. a kind of Switching Power Supply wide scope input undervoltage detection circuit according to claim 1, it is characterized in that: the benchmark
Device (4) include provide reference signal for volt circuit (41), be coupled to for volt circuit (41) reinforce pressure stabilizing auxiliary circuit
(42).
6. a kind of Switching Power Supply wide scope input undervoltage detection circuit according to claim 1, it is characterized in that: the control
Device (5) receives comparison signal including being coupled to comparison unit (3) and exports the trigger circuit (51) of trigger signal, is coupled to
Trigger circuit (51) is to receive trigger signal and export the control circuit (52) of control signal.
7. a kind of Switching Power Supply wide scope input undervoltage detection circuit according to claim 6, it is characterized in that: the control
Device (5) further includes being coupled to control circuit (52) and for protecting the first of control circuit (52) to protect circuit (53).
8. a kind of Switching Power Supply wide scope input undervoltage detection circuit according to claim 1, it is characterized in that: the instruction
Device (6) includes being coupled to control device (5) to receive control signal and be indicated and with realizing by single in response to control signal
The indicating circuit (61) of light emitting diode composition is coupled to indicating circuit (61) and for protecting the second of indicating circuit (61) to protect
Protection circuit (62).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820875375.6U CN208314063U (en) | 2018-06-06 | 2018-06-06 | A kind of Switching Power Supply wide scope input undervoltage detection circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820875375.6U CN208314063U (en) | 2018-06-06 | 2018-06-06 | A kind of Switching Power Supply wide scope input undervoltage detection circuit |
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| CN208314063U true CN208314063U (en) | 2019-01-01 |
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| CN201820875375.6U Active CN208314063U (en) | 2018-06-06 | 2018-06-06 | A kind of Switching Power Supply wide scope input undervoltage detection circuit |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110514883A (en) * | 2019-09-18 | 2019-11-29 | 中国电子科技集团公司第五十八研究所 | A kind of high pressure wide input range current sample operational amplifier circuit |
| CN111446852A (en) * | 2020-04-22 | 2020-07-24 | 深圳华德电子有限公司 | Switching power supply and control method thereof |
| CN112312490A (en) * | 2019-08-01 | 2021-02-02 | 中国移动通信集团浙江有限公司 | Signal switching device and system |
-
2018
- 2018-06-06 CN CN201820875375.6U patent/CN208314063U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112312490A (en) * | 2019-08-01 | 2021-02-02 | 中国移动通信集团浙江有限公司 | Signal switching device and system |
| CN110514883A (en) * | 2019-09-18 | 2019-11-29 | 中国电子科技集团公司第五十八研究所 | A kind of high pressure wide input range current sample operational amplifier circuit |
| CN111446852A (en) * | 2020-04-22 | 2020-07-24 | 深圳华德电子有限公司 | Switching power supply and control method thereof |
| CN111446852B (en) * | 2020-04-22 | 2023-03-31 | 深圳华德电子有限公司 | Switching power supply and control method thereof |
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