CN208691209U - A kind of high-low pressure automatic switchover electronic switching circuit - Google Patents
A kind of high-low pressure automatic switchover electronic switching circuit Download PDFInfo
- Publication number
- CN208691209U CN208691209U CN201820785840.7U CN201820785840U CN208691209U CN 208691209 U CN208691209 U CN 208691209U CN 201820785840 U CN201820785840 U CN 201820785840U CN 208691209 U CN208691209 U CN 208691209U
- Authority
- CN
- China
- Prior art keywords
- voltage
- switching circuit
- circuit
- low pressure
- electronic switching
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Relay Circuits (AREA)
Abstract
The utility model discloses a kind of high-low pressure automatic switchover electronic switching circuit, it include: switching circuit control section is in low-voltage low current weak current part, L or N forceful electric power circuit is turned on and off by controlling actuation or the relieving of the contact of relay, including being compared by the voltage after detection AC rectification with reference voltage, when exchange input is lower than setting voltage, the starting of relay coil driving circuit, relay contact are attracted, the work of two voltage-doubling boost circuits；When exchange input is higher than setting voltage, relay coil no current flows through, and contact is unclamped, and two voltage-doubling boost circuits stop working, to reach the silicon-controlled electronic switch for realizing that reliability is significantly larger than existing scheme, a kind of reliable, inexpensive, automatic electronic switching circuit of intelligence is realized.
Description
Technical field
The utility model relates to electronic switching circuit technical fields more particularly to a kind of high-low pressure to automatically switch electronic switch
Circuit.
Background technique
All the time, Switching Power Supply industry design when encounter exchange high-low pressure (110/220VAC) input when because rectification after
Voltage magnitude difference is too big, and there are high frequency transformer difficult design, the transfer efficiency of transformer is low when low pressure inputs, and copper loss is serious
The problem of, and active power factor (PF) emphasizer circuit circuit is complicated, it is expensive；People prefer in terms of pursuing cost performance
Brought the voltage up by way of 2 voltage-doubling boosts when being inputted AC low-tension by the way of a kind of simple, low cost be allowed to
DC voltage improves transfer efficiency close to reduce transformer loss after rectification when ac high-voltage inputs.
Currently, switching electronic switching circuit about high-low pressure, in industry there are two kinds of switching modes: one is pass through object
Reason switch directly carries out high-low pressure switching；Another kind is to carry out electronics switching by the silicon-controlled circuit that seals in.Former switching side
Formula is simple, reliable, low cost, but need it is artificial carry out stirring switching manually, it is more troublesome；Latter approach passes through circuit
Detection carries out electronics automatic switchover, the disadvantage is that silicon-controlled be directly connected in forceful electric power road is easily damaged, reliability has hidden danger.
Utility model content
The utility model provides a kind of high-low pressure automatic switchover electronic switching circuit, needs artificially to solve the prior art
Manually carry out stirring switching, more troublesome, silicon-controlled be directly connected in forceful electric power road is easily damaged, and reliability has the skill of hidden danger
Art problem.
In order to solve the above technical problems, the utility model provides a kind of high-low pressure automatic switchover electronic switching circuit, comprising:
Switching circuit control section be in low-voltage low current weak current part, by control relay contact actuation or
It decontrols to turn on and off L or N forceful electric power circuit.
Wherein, the switching circuit control section is in low-voltage low current weak current part, by the touching for controlling relay
The actuation or relieving of point turn on and off L or N forceful electric power circuit, comprising:
It is compared by the voltage after detection AC rectification with reference voltage, when exchange input is lower than setting voltage,
The starting of relay coil driving circuit, relay contact are attracted, the work of two voltage-doubling boost circuits；When exchange input is higher than setting electricity
When pressure, relay coil no current flows through, and contact is unclamped, and two voltage-doubling boost circuits stop working.
Wherein, the voltage after the AC rectification by detection is compared with reference voltage, is set when exchange input is lower than
When constant voltage, relay coil driving circuit starting, relay contact is attracted, the work of two voltage-doubling boost circuits；When exchange inputs
When higher than setting voltage, relay coil no current flows through, and contact is unclamped, and two voltage-doubling boost circuits stop working, comprising:
When the switching circuit works, L line is then connected into the midpoint C3, C6, identical rectified voltage by relay contact closure
Voltage superposition on C3 forms two multiplication of voltages on the voltage of C6.
Wherein, the voltage after the AC rectification by detection is compared with reference voltage, is set when exchange input is lower than
When constant voltage, relay coil driving circuit starting, relay contact is attracted, the work of two voltage-doubling boost circuits；When exchange inputs
When higher than setting voltage, relay coil no current flows through, and contact is unclamped, and two voltage-doubling boost circuits stop working, further includes:
When ac high voltage input, the switching circuit switch Q1 cut-off, relay contact tripping, L line cannot be accessed
The midpoint C3, C6, voltage-doubling boost circuit cannot be formed, and rectified voltage is exported.
Wherein, the voltage after the AC rectification by detection is compared with reference voltage, is set when exchange input is lower than
When constant voltage, relay coil driving circuit starting, relay contact is attracted, the work of two voltage-doubling boost circuits；When exchange inputs
When higher than setting voltage, relay coil no current flows through, and contact is unclamped, and two voltage-doubling boost circuits stop working, further includes:
Drop of the electricity after BD2, D7, C4 rectifying and wave-filtering by being formed by R1, Q2, D6, ZD7, R21, R22, R15 is taken by L/N
Press voltage regulator circuit by voltage stabilization in predetermined value.
Wherein, the voltage after the AC rectification by detection is compared with reference voltage, is set when exchange input is lower than
When constant voltage, relay coil driving circuit starting, relay contact is attracted, the work of two voltage-doubling boost circuits；When exchange inputs
When higher than setting voltage, relay coil no current flows through, and contact is unclamped, and two voltage-doubling boost circuits stop working, further includes:
Input voltage is detected by the input voltage detection circuit that R21, R22, R14, R9 divider resistance are formed.
Wherein, the voltage after the AC rectification by detection is compared with reference voltage, is set when exchange input is lower than
When constant voltage, relay coil driving circuit starting, relay contact is attracted, the work of two voltage-doubling boost circuits；When exchange inputs
When higher than setting voltage, relay coil no current flows through, and contact is unclamped, and two voltage-doubling boost circuits stop working, further includes:
The base stage of triode Q12 is terminated on R9, the conducting voltage of triode corresponds to the set point of input voltage.
Wherein, the voltage after the AC rectification by detection is compared with reference voltage, is set when exchange input is lower than
When constant voltage, relay coil driving circuit starting, relay contact is attracted, the work of two voltage-doubling boost circuits；When exchange inputs
When higher than setting voltage, relay coil no current flows through, and contact is unclamped, and two voltage-doubling boost circuits stop working, further includes:
R11, C1, ZD8, C20, R6, Q1 are after circuit coil driving circuit.
Wherein, the voltage after the AC rectification by detection is compared with reference voltage, is set when exchange input is lower than
When constant voltage, relay coil driving circuit starting, relay contact is attracted, the work of two voltage-doubling boost circuits；When exchange inputs
When higher than setting voltage, relay coil no current flows through, and contact is unclamped, and two voltage-doubling boost circuits stop working, further includes:
ZD1 is drop-down zener diode, and when Q12 conducting, by ZD1 by the voltage pull-down of C1, ZD8 ends, and Q1 is also cut
Only, relay contact tripping, electronic switch disconnect, and two voltage doubling rectifying circuit stops working.
Wherein, the voltage after the AC rectification by detection is compared with reference voltage, is set when exchange input is lower than
When constant voltage, relay coil driving circuit starting, relay contact is attracted, the work of two voltage-doubling boost circuits；When exchange inputs
When higher than setting voltage, relay coil no current flows through, and contact is unclamped, and two voltage-doubling boost circuits stop working, further includes:
When AC-input voltage is lower than setting voltage, Q12 cut-off, ZD1 cut-off, ZD8 conducting, Q1 conducting, relay touching
Point is attracted, two voltage doubling rectifying circuit work.
High-low pressure provided by the utility model automatically switches electronic switching circuit, comprising: switching circuit control section be
Low-voltage low current weak current part turns on and off L or N forceful electric power electricity by controlling actuation or the relieving of the contact of relay
Road, including being compared by the voltage after detection AC rectification with reference voltage, when exchange input is lower than setting voltage, after
The starting of electric apparatus coil driving circuit, relay contact are attracted, the work of two voltage-doubling boost circuits；When exchange input is higher than setting voltage
When, relay coil no current flows through, and contact is unclamped, and two voltage-doubling boost circuits stop working, and realizes that reliability is wanted to reach
Much larger than the silicon-controlled electronic switch of existing scheme, a kind of reliable, inexpensive, automatic electronic switching circuit of intelligence is realized.
Detailed description of the invention
Fig. 1 is the circuit for the two voltage-doubling boost rectification circuits that the utility model high-low pressure automatically switches in electronic switching circuit
Schematic diagram；
Fig. 2 is the circuit diagram that the utility model high-low pressure automatically switches electronic switching circuit.
Specific embodiment
With reference to the accompanying drawings and examples, the utility model is described in further detail.It is emphasized that following
Embodiment is merely to illustrate the utility model, but is not defined to the scope of the utility model.Likewise, following embodiment is only
For the utility model section Example and not all embodiments, those of ordinary skill in the art are not making creative work
Under the premise of all other embodiment obtained, fall within the protection scope of the utility model.
The utility model provides a kind of high-low pressure automatic switchover electronic switching circuit.
Referring to Figure 1 and Fig. 2, Fig. 1 automatically switch two multiplication of voltage liters in electronic switching circuit for the utility model high-low pressure
The circuit diagram of voltage rectifier, Fig. 2 are the circuit diagram that the utility model high-low pressure automatically switches electronic switching circuit,
The utility model high-low pressure automatically switches electronic switching circuit, comprising:
Switching circuit control section be in low-voltage low current weak current part, by control relay contact actuation or
It decontrols to turn on and off L or N forceful electric power circuit.
Wherein, which is in low-voltage low current weak current part, by the contact for controlling relay
Actuation or relieving turn on and off L or N forceful electric power circuit, comprising:
It is compared by the voltage after detection AC rectification with reference voltage, when exchange input is lower than setting voltage,
The starting of relay coil driving circuit, relay contact are attracted, the work of two voltage-doubling boost circuits；When exchange input is higher than setting electricity
When pressure, relay coil no current flows through, and contact is unclamped, and two voltage-doubling boost circuits stop working.
Wherein, it should be compared by the voltage after detection AC rectification with reference voltage, when exchange input is lower than setting
When voltage, relay coil driving circuit starting, relay contact is attracted, the work of two voltage-doubling boost circuits；When exchange input is high
When setting voltage, relay coil no current flows through, and contact is unclamped, and two voltage-doubling boost circuits stop working, comprising:
When the switching circuit works, L line is then connected into the midpoint C3, C6, identical rectified voltage C3 by relay contact closure
On voltage superposition on the voltage of C6, formed two multiplication of voltages.
Wherein, it should be compared by the voltage after detection AC rectification with reference voltage, when exchange input is lower than setting
When voltage, relay coil driving circuit starting, relay contact is attracted, the work of two voltage-doubling boost circuits；When exchange input is high
When setting voltage, relay coil no current flows through, and contact is unclamped, and two voltage-doubling boost circuits stop working, further includes:
When ac high voltage input when, the switching circuit switch Q1 end, relay contact tripping, L line cannot access C3,
The midpoint C6, voltage-doubling boost circuit cannot be formed, and rectified voltage is exported.
Wherein, it should be compared by the voltage after detection AC rectification with reference voltage, when exchange input is lower than setting
When voltage, relay coil driving circuit starting, relay contact is attracted, the work of two voltage-doubling boost circuits；When exchange input is high
When setting voltage, relay coil no current flows through, and contact is unclamped, and two voltage-doubling boost circuits stop working, further includes:
Drop of the electricity after BD2, D7, C4 rectifying and wave-filtering by being formed by R1, Q2, D6, ZD7, R21, R22, R15 is taken by L/N
Press voltage regulator circuit by voltage stabilization in predetermined value.
Wherein, it should be compared by the voltage after detection AC rectification with reference voltage, when exchange input is lower than setting
When voltage, relay coil driving circuit starting, relay contact is attracted, the work of two voltage-doubling boost circuits；When exchange input is high
When setting voltage, relay coil no current flows through, and contact is unclamped, and two voltage-doubling boost circuits stop working, further includes:
Input voltage is detected by the input voltage detection circuit that R21, R22, R14, R9 divider resistance are formed.
Wherein, it should be compared by the voltage after detection AC rectification with reference voltage, when exchange input is lower than setting
When voltage, relay coil driving circuit starting, relay contact is attracted, the work of two voltage-doubling boost circuits；When exchange input is high
When setting voltage, relay coil no current flows through, and contact is unclamped, and two voltage-doubling boost circuits stop working, further includes:
The base stage of triode Q12 is terminated on R9, the conducting voltage of triode corresponds to the set point of input voltage.
Wherein, it should be compared by the voltage after detection AC rectification with reference voltage, when exchange input is lower than setting
When voltage, relay coil driving circuit starting, relay contact is attracted, the work of two voltage-doubling boost circuits；When exchange input is high
When setting voltage, relay coil no current flows through, and contact is unclamped, and two voltage-doubling boost circuits stop working, further includes:
R11, C1, ZD8, C20, R6, Q1 are after circuit coil driving circuit.
Wherein, it should be compared by the voltage after detection AC rectification with reference voltage, when exchange input is lower than setting
When voltage, relay coil driving circuit starting, relay contact is attracted, the work of two voltage-doubling boost circuits；When exchange input is high
When setting voltage, relay coil no current flows through, and contact is unclamped, and two voltage-doubling boost circuits stop working, further includes:
ZD1 is drop-down zener diode, and when Q12 conducting, by ZD1 by the voltage pull-down of C1, ZD8 ends, and Q1 is also cut
Only, relay contact tripping, electronic switch disconnect, and two voltage doubling rectifying circuit stops working.
Wherein, it should be compared by the voltage after detection AC rectification with reference voltage, when exchange input is lower than setting
When voltage, relay coil driving circuit starting, relay contact is attracted, the work of two voltage-doubling boost circuits；When exchange input is high
When setting voltage, relay coil no current flows through, and contact is unclamped, and two voltage-doubling boost circuits stop working, further includes:
When AC-input voltage is lower than setting voltage, Q12 cut-off, ZD1 cut-off, ZD8 conducting, Q1 conducting, relay touching
Point is attracted, two voltage doubling rectifying circuit work.
High-low pressure provided by the utility model automatically switches electronic switching circuit, comprising: switching circuit control section be
Low-voltage low current weak current part turns on and off L or N forceful electric power electricity by controlling actuation or the relieving of the contact of relay
Road, including being compared by the voltage after detection AC rectification with reference voltage, when exchange input is lower than setting voltage, after
The starting of electric apparatus coil driving circuit, relay contact are attracted, the work of two voltage-doubling boost circuits；When exchange input is higher than setting voltage
When, relay coil no current flows through, and contact is unclamped, and two voltage-doubling boost circuits stop working, and realizes that reliability is wanted to reach
Much larger than the silicon-controlled electronic switch of existing scheme, a kind of reliable, inexpensive, automatic electronic switching circuit of intelligence is realized.
High-low pressure provided by the utility model automatically switches electronic switching circuit, takes electricity to rectify through BD2, D7, C4 by L/N and filters
After wave by the decompression voltage regulator that is formed by R1, Q2, D6, ZD7, R21, R22, R15 by voltage stabilization in such as 24VDC or so.
High-low pressure provided by the utility model automatically switches electronic switching circuit, such as when low AC voltage input
L line is then connected into the midpoint C3, C6 by 110VAC, relay contact closure, and the voltage superposition on identical rectified voltage C3 is C6's
On voltage, that is, two multiplication of voltages, such as from about 310VDC or so are formed, close to 220VAC input rectifying voltage.
High-low pressure provided by the utility model automatically switches electronic switching circuit, such as when ac high voltage input
220VAC, the switching circuit switch Q1 cut-off, relay contact tripping, L line cannot access the midpoint C3, C6, voltage-doubling boost circuit
It cannot be formed, export rectified voltage such as from about 310VDC.
High-low pressure provided by the utility model automatically switches electronic switching circuit, can be used for the voltage-doubling boost electricity of Switching Power Supply
Lu Zhong, it can also be used to it is practical in other under-voltage or overvoltage crowbar, it is at low cost, stablize safe and reliable.
High-low pressure provided by the utility model automatically switches electronic switching circuit, and power supply therein is inputted in entire high-low pressure
Transformer inputs voltage keeps high pressure floating range little in range, and transformer is caused to be maintained in entire input voltage range
High efficiency is converted when work, energy-saving.
In several embodiments provided by the utility model, it should be understood that disclosed circuit can pass through it
Its mode is realized.For example, circuit implementation described above is only schematical, for example, circuit or component
It divides, only a kind of logical function partition, there may be another division manner in actual implementation, such as multiple circuits or first device
Part may be combined or can be integrated into another circuit system, or some features can be ignored or not executed.Another point, institute
Display or the mutual coupling, direct-coupling or communication connection discussed can be through some interfaces, circuit or component
Indirect coupling or communication connection, can be electrical property, mechanical or other forms.
Component may or may not be physically separated as illustrated by the separation member, as assembly of elements
Component or circuit may or may not be physical unit, it can it is in one place, or can also be distributed
Onto multiple circuit units.It can select some or all of circuit or component therein according to the actual needs to realize this
The purpose of embodiment scheme.
In addition, can integrate in a processing circuit in each functional circuit in each embodiment of the utility model,
It is also possible to each unit circuit or component physically exists alone, it can also be with two or more element circuits or component
It is integrated in one unit in circuit or component.Above-mentioned integrated element circuit or component can take the form of hardware reality
It is existing.
If integrated element circuit or component are realized in the form of hardware function units and as independent product pins
It sells or in use, can store in a computer readable storage medium.Based on this understanding, the skill of the utility model
Substantially all or part of the part that contributes to existing technology or the technical solution can be with soft in other words for art scheme
The form of part product embodies, which is stored in a storage medium, including some instructions are to make
It obtains a computer equipment (can be personal computer, server or the network equipment etc.) or processor (processor) is held
The all or part of the steps of each embodiment scheme of row the utility model.And storage medium above-mentioned includes: USB flash disk, moves firmly
Disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory),
The various media that can store program code such as magnetic or disk.
The foregoing is merely the section Examples of the utility model, are not intended to limit the protection scope of the utility model,
Equivalent device made by using the description of the utility model and the drawings or equivalent process transformation, are directly or indirectly transported
Used in other related technical areas, it is also included in the patent protection scope of the utility model.
Claims (10)
1. a kind of high-low pressure automatically switches electronic switching circuit characterized by comprising
Switching circuit control section is the actuation or relieving of the contact in low-voltage low current weak current part, by controlling relay
To turn on and off L or N forceful electric power circuit.
2. high-low pressure as described in claim 1 automatically switches electronic switching circuit characterized by comprising
It is compared by the voltage after detection AC rectification with reference voltage, when exchange input is lower than setting voltage, relay
The starting of device coil driver, relay contact are attracted, the work of two voltage-doubling boost circuits；When exchange input is higher than setting voltage
When, relay coil no current flows through, and contact is unclamped, and two voltage-doubling boost circuits stop working.
3. high-low pressure as claimed in claim 2 automatically switches electronic switching circuit characterized by comprising
When the switching circuit works, L line is then connected into the midpoint C3, C6 by relay contact closure, on identical rectified voltage C3
Voltage superposition on the voltage of C6, formed two multiplication of voltages.
4. high-low pressure as claimed in claim 2 automatically switches electronic switching circuit, which is characterized in that further include:
When ac high voltage input when, the switching circuit switch Q1 cut-off, relay contact tripping, L line cannot access C3,
The midpoint C6, voltage-doubling boost circuit cannot be formed, and rectified voltage is exported.
5. high-low pressure as claimed in claim 2 automatically switches electronic switching circuit, which is characterized in that further include:
Take electricity steady by the decompression formed by R1, Q2, D6, ZD7, R21, R22, R15 after BD2, D7, C4 rectifying and wave-filtering by L/N
Volt circuit is by voltage stabilization in predetermined value.
6. high-low pressure as claimed in claim 2 automatically switches electronic switching circuit, which is characterized in that further include:
Input voltage is detected by the input voltage detection circuit that R21, R22, R14, R9 divider resistance are formed.
7. high-low pressure as claimed in claim 2 automatically switches electronic switching circuit, which is characterized in that further include:
The base stage of triode Q12 is terminated on R9, the conducting voltage of triode corresponds to the set point of input voltage.
8. high-low pressure as claimed in claim 2 automatically switches electronic switching circuit, which is characterized in that further include:
R11, C1, ZD8, C20, R6, Q1 are after circuit coil driving circuit.
9. high-low pressure as claimed in claim 2 automatically switches electronic switching circuit, which is characterized in that further include:
ZD1 is drop-down zener diode, and when Q12 conducting, by ZD1 by the voltage pull-down of C1, ZD8 ends, and Q1 is also switched off, after
Appliance contact tripping, electronic switch disconnect, and two voltage doubling rectifying circuit stops working.
10. high-low pressure as claimed in claim 2 automatically switches electronic switching circuit, which is characterized in that further include:
When AC-input voltage is lower than setting voltage, Q12 cut-off, ZD1 ends, ZD8 conducting, Q1 conducting, and relay contact is inhaled
It closes, two voltage doubling rectifying circuit work.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820785840.7U CN208691209U (en) | 2018-05-24 | 2018-05-24 | A kind of high-low pressure automatic switchover electronic switching circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820785840.7U CN208691209U (en) | 2018-05-24 | 2018-05-24 | A kind of high-low pressure automatic switchover electronic switching circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208691209U true CN208691209U (en) | 2019-04-02 |
Family
ID=65877500
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820785840.7U Active CN208691209U (en) | 2018-05-24 | 2018-05-24 | A kind of high-low pressure automatic switchover electronic switching circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208691209U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108768357A (en) * | 2018-05-24 | 2018-11-06 | 深圳日辉达电源股份有限公司 | A kind of high-low pressure automatic switchover electronic switching circuit |
-
2018
- 2018-05-24 CN CN201820785840.7U patent/CN208691209U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108768357A (en) * | 2018-05-24 | 2018-11-06 | 深圳日辉达电源股份有限公司 | A kind of high-low pressure automatic switchover electronic switching circuit |
| CN108768357B (en) * | 2018-05-24 | 2024-05-14 | 深圳日辉达电源股份有限公司 | High-low voltage automatic switching electronic switch circuit |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101707828B (en) | Constant-current source driving circuit with open circuit protection and adopting LED | |
| CN102262977B (en) | Drive circuit of AC contactor | |
| CN109445336B (en) | Switch control circuit and switch control system | |
| CN102843048A (en) | Power supply for low stand-by power consumption electromagnetic heating device and electromagnetic oven | |
| CN208691209U (en) | A kind of high-low pressure automatic switchover electronic switching circuit | |
| CN101464720B (en) | Power supplier | |
| CN106329938B (en) | Switching Power Supply and its control method | |
| CN110416975A (en) | A kind of power protecting circuit and new-energy automobile | |
| CN201865951U (en) | Electric fan protection circuit of human touch stall | |
| CN108768357B (en) | High-low voltage automatic switching electronic switch circuit | |
| CN203135735U (en) | Continuous current plant | |
| CN207559873U (en) | A kind of socket circuit for exchanging control | |
| CN202696482U (en) | Power supply circuit for leakage circuit breaker | |
| CN205681285U (en) | The self-powered circuit of non-isolated booster circuit pwm chip | |
| CN209229952U (en) | Four-way valve controling circuit, air conditioner control circuit and transducer air conditioning | |
| CN209217948U (en) | A kind of DC-DC circuit and device with over-voltage protecting function | |
| CN208063038U (en) | A kind of power circuit | |
| CN203630177U (en) | Near-infrared reading device and ammeter | |
| CN202837873U (en) | Zero power standby circuit and corresponding electronic product | |
| CN207910686U (en) | Switching power supply and electronic equipment | |
| CN219420287U (en) | Multi-output undervoltage protection control circuit | |
| CN111585457A (en) | Power adapter and electronic equipment | |
| CN221448093U (en) | Electronic equipment | |
| CN205377690U (en) | Impedance voltage drop circuit | |
| CN103887991A (en) | Transformless high-voltage and low-power power supply |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |