CN108768357B - High-low voltage automatic switching electronic switch circuit - Google Patents
High-low voltage automatic switching electronic switch circuit Download PDFInfo
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- CN108768357B CN108768357B CN201810505294.1A CN201810505294A CN108768357B CN 108768357 B CN108768357 B CN 108768357B CN 201810505294 A CN201810505294 A CN 201810505294A CN 108768357 B CN108768357 B CN 108768357B
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- 238000000034 method Methods 0.000 claims description 23
- 230000000087 stabilizing effect Effects 0.000 claims description 6
- 238000001514 detection method Methods 0.000 claims description 4
- 239000003990 capacitor Substances 0.000 claims 4
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 abstract description 6
- 229910052710 silicon Inorganic materials 0.000 abstract description 6
- 239000010703 silicon Substances 0.000 abstract description 6
- 238000010586 diagram Methods 0.000 description 4
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
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- 230000006870 function Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/08—Modifications for protecting switching circuit against overcurrent or overvoltage
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
- H03K2017/515—Mechanical switches; Electronic switches controlling mechanical switches, e.g. relais
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Abstract
The invention discloses a high-low voltage automatic switching electronic switch circuit, which comprises: the control part of the switching circuit is in the low-voltage low-current weak current part, the L or N strong current circuit is switched on or off by controlling the attraction or release of the contact of the relay, the control part comprises the steps of comparing the voltage after alternating current rectification with a reference voltage by detecting, when the alternating current input is lower than the set voltage, starting the relay coil driving circuit, attracting the contact of the relay, and operating the double-voltage boosting circuit; when the alternating current input is higher than the set voltage, no current flows through the relay coil, the contacts are loosened, and the double voltage boosting circuit stops working, so that the silicon controlled electronic switch with far higher reliability than the existing scheme is realized, and the reliable, low-cost and intelligent automatic electronic switch circuit is realized.
Description
Technical Field
The invention relates to the technical field of electronic switching circuits, in particular to a high-low voltage automatic switching electronic switching circuit.
Background
In the prior art, when the switching power supply industry is designed, the voltage amplitude difference after rectification is too large when alternating current high-low voltage (110/220 VAC) is input, the problems of difficult design of a high-frequency transformer, low conversion efficiency of the transformer and serious copper loss exist when the low-voltage is input, and an active power factor correction circuit is complex in circuit and high in cost; in the aspect of pursuing cost performance, a simple and low-cost mode is more hoped to be adopted to boost the voltage by 2 times when the alternating current low-voltage is input so as to lead the voltage to be close to the rectified direct current voltage when the alternating current high-voltage is input, thereby reducing the loss of a transformer and improving the conversion efficiency.
Currently, regarding high-low voltage switching electronic switching circuits, there are two switching modes in the industry: one is to directly switch high voltage and low voltage through a physical switch; the other is to switch electronically by the series circuit of the controlled silicon. The former switching mode is simple, reliable and low in cost, but manual pulling switching is needed, which is troublesome; the latter way carries out electronic automatic switching through circuit detection, and the defect is that the silicon controlled rectifier is directly connected in series in a strong circuit and is extremely easy to damage, and the reliability has hidden danger.
Disclosure of Invention
The invention provides a high-low voltage automatic switching electronic switch circuit, which is used for solving the technical problems that the manual pulling switching is needed in the prior art, the trouble is relatively involved, the silicon controlled rectifier is directly connected in series in a strong circuit, the damage is very easy, and the reliability has hidden danger.
In order to solve the above technical problems, the present invention provides a high-low voltage automatic switching electronic switch circuit, comprising:
the switching circuit control part is used for switching on or off the L or N strong current circuit by controlling the on or off of the contact of the relay in the low-voltage low-current weak current part.
Wherein, the switch circuit control part is at low voltage low current weak current part, turns on or off L or N strong current circuit through the actuation or opening of the contact of control relay, includes:
Comparing the voltage after AC rectification with a reference voltage, and starting a relay coil driving circuit when the AC input is lower than a set voltage, wherein a relay contact is attracted, and a double-voltage boosting circuit works; when the alternating current input is higher than the set voltage, no current flows through the relay coil, the contact is loosened, and the double voltage boosting circuit stops working.
The voltage after alternating current rectification is detected to be compared with a reference voltage, when the alternating current input is lower than a set voltage, a relay coil driving circuit is started, a relay contact is attracted, and a double-voltage boosting circuit works; when the alternating current input is higher than the set voltage, no current flows through the relay coil, the contact is loosened, and the double voltage boosting circuit stops working, and the method comprises the following steps:
when the switching circuit works, the relay contacts are closed, the L line is connected to the midpoints of C3 and C6, and the voltage on the same rectified voltage C3 is superposed on the voltage of C6 to form a doubling voltage.
The voltage after alternating current rectification is detected to be compared with a reference voltage, when the alternating current input is lower than a set voltage, a relay coil driving circuit is started, a relay contact is attracted, and a double-voltage boosting circuit works; when the alternating current input is higher than the set voltage, no current flows through the relay coil, the contact is loosened, and the double voltage boosting circuit stops working, and the method further comprises the following steps:
When alternating-current high voltage is input, the switch circuit switch Q1 is cut off, the relay contact is tripped, the L line cannot be connected to the midpoints of C3 and C6, the voltage doubling step-up circuit cannot be formed, and rectified voltage is output.
The voltage after alternating current rectification is detected to be compared with a reference voltage, when the alternating current input is lower than a set voltage, a relay coil driving circuit is started, a relay contact is attracted, and a double-voltage boosting circuit works; when the alternating current input is higher than the set voltage, no current flows through the relay coil, the contact is loosened, and the double voltage boosting circuit stops working, and the method further comprises the following steps:
The L/N power supply is rectified and filtered by BD2, D7 and C4, and then the voltage is stabilized at a preset value by a voltage-reducing and stabilizing circuit formed by R1, Q2, D6, ZD7, R21, R22 and R15.
The voltage after alternating current rectification is detected to be compared with a reference voltage, when the alternating current input is lower than a set voltage, a relay coil driving circuit is started, a relay contact is attracted, and a double-voltage boosting circuit works; when the alternating current input is higher than the set voltage, no current flows through the relay coil, the contact is loosened, and the double voltage boosting circuit stops working, and the method further comprises the following steps:
An input voltage detection circuit formed by the voltage dividing resistors of R21, R22, R14, R9 detects an input voltage.
The voltage after alternating current rectification is detected to be compared with a reference voltage, when the alternating current input is lower than a set voltage, a relay coil driving circuit is started, a relay contact is attracted, and a double-voltage boosting circuit works; when the alternating current input is higher than the set voltage, no current flows through the relay coil, the contact is loosened, and the double voltage boosting circuit stops working, and the method further comprises the following steps:
the upper end of R9 is connected with the base electrode of triode Q12, and the conducting voltage of triode corresponds to the set point of input voltage.
The voltage after alternating current rectification is detected to be compared with a reference voltage, when the alternating current input is lower than a set voltage, a relay coil driving circuit is started, a relay contact is attracted, and a double-voltage boosting circuit works; when the alternating current input is higher than the set voltage, no current flows through the relay coil, the contact is loosened, and the double voltage boosting circuit stops working, and the method further comprises the following steps:
r11, C1, ZD8, C20, R6 and Q1 are relay coil driving circuits.
The voltage after alternating current rectification is detected to be compared with a reference voltage, when the alternating current input is lower than a set voltage, a relay coil driving circuit is started, a relay contact is attracted, and a double-voltage boosting circuit works; when the alternating current input is higher than the set voltage, no current flows through the relay coil, the contact is loosened, and the double voltage boosting circuit stops working, and the method further comprises the following steps:
ZD1 is a pull-down zener diode, when Q12 is conducted, the voltage of C1 is pulled down through ZD1, ZD8 is cut off, Q1 is also cut off, a relay contact is tripped, an electronic switch is disconnected, and the double voltage rectifying circuit stops working.
The voltage after alternating current rectification is detected to be compared with a reference voltage, when the alternating current input is lower than a set voltage, a relay coil driving circuit is started, a relay contact is attracted, and a double-voltage boosting circuit works; when the alternating current input is higher than the set voltage, no current flows through the relay coil, the contact is loosened, and the double voltage boosting circuit stops working, and the method further comprises the following steps:
When the alternating current input voltage is lower than the set voltage, Q12 is cut off, ZD1 is cut off, ZD8 is conducted, Q1 is conducted, the relay contacts are attracted, and the double voltage rectifying circuit works.
The invention provides a high-low voltage automatic switching electronic switch circuit, which comprises: the control part of the switching circuit is in the low-voltage low-current weak current part, the L or N strong current circuit is switched on or off by controlling the attraction or release of the contact of the relay, the control part comprises the steps of comparing the voltage after alternating current rectification with a reference voltage by detecting, when the alternating current input is lower than the set voltage, starting the relay coil driving circuit, attracting the contact of the relay, and operating the double-voltage boosting circuit; when the alternating current input is higher than the set voltage, no current flows through the relay coil, the contacts are loosened, and the double voltage boosting circuit stops working, so that the silicon controlled electronic switch with far higher reliability than the existing scheme is realized, and the reliable, low-cost and intelligent automatic electronic switch circuit is realized.
Drawings
FIG. 1 is a schematic diagram of a voltage doubling step-up rectifier circuit in an automatic high-low voltage switching electronic switch circuit according to the present invention;
fig. 2 is a schematic circuit diagram of the high-low voltage automatic switching electronic switch circuit of the present invention.
Detailed Description
The invention is described in further detail below with reference to the drawings and examples. It is specifically noted that the following examples are only for illustrating the present invention, but do not limit the scope of the present invention. Likewise, the following examples are only some, but not all, of the examples of the present invention, and all other examples, which a person of ordinary skill in the art would obtain without making any inventive effort, are within the scope of the present invention.
The invention provides a high-low voltage automatic switching electronic switch circuit.
Referring to fig. 1 and 2, fig. 1 is a circuit schematic diagram of a voltage doubling step-up rectifying circuit in a high-low voltage automatic switching electronic switching circuit according to the present invention, and fig. 2 is a circuit schematic diagram of a high-low voltage automatic switching electronic switching circuit according to the present invention, wherein the high-low voltage automatic switching electronic switching circuit according to the present invention comprises:
the switching circuit control part is used for switching on or off the L or N strong current circuit by controlling the on or off of the contact of the relay in the low-voltage low-current weak current part.
The switching circuit control part is used for switching on or off an L or N strong current circuit in a low-voltage low-current weak current part by controlling the on or off of contacts of a relay, and comprises the following components:
Comparing the voltage after AC rectification with a reference voltage, and starting a relay coil driving circuit when the AC input is lower than a set voltage, wherein a relay contact is attracted, and a double-voltage boosting circuit works; when the alternating current input is higher than the set voltage, no current flows through the relay coil, the contact is loosened, and the double voltage boosting circuit stops working.
The voltage after alternating current rectification is detected to be compared with a reference voltage, when the alternating current input is lower than a set voltage, a relay coil driving circuit is started, a relay contact is attracted, and a double-voltage boosting circuit works; when the alternating current input is higher than the set voltage, no current flows through the relay coil, the contact is loosened, and the double voltage boosting circuit stops working, and the method comprises the following steps:
when the switching circuit works, the relay contacts are closed, then the L line is connected to the midpoints of C3 and C6, and the voltage on the same rectified voltage C3 is superposed on the voltage of C6 to form a doubling voltage.
The voltage after alternating current rectification is detected to be compared with a reference voltage, when the alternating current input is lower than a set voltage, a relay coil driving circuit is started, a relay contact is attracted, and a double-voltage boosting circuit works; when the alternating current input is higher than the set voltage, no current flows through the relay coil, the contact is loosened, and the double voltage boosting circuit stops working, and the method further comprises the following steps:
When alternating-current high voltage is input, the switch circuit switch Q1 is cut off, the relay contact is tripped, the L line cannot be connected to the midpoint of C3 and C6, the voltage doubling step-up circuit cannot be formed, and rectified voltage is output.
The voltage after alternating current rectification is detected to be compared with a reference voltage, when the alternating current input is lower than a set voltage, a relay coil driving circuit is started, a relay contact is attracted, and a double-voltage boosting circuit works; when the alternating current input is higher than the set voltage, no current flows through the relay coil, the contact is loosened, and the double voltage boosting circuit stops working, and the method further comprises the following steps:
The L/N power supply is rectified and filtered by BD2, D7 and C4, and then the voltage is stabilized at a preset value by a voltage-reducing and stabilizing circuit formed by R1, Q2, D6, ZD7, R21, R22 and R15.
The voltage after alternating current rectification is detected to be compared with a reference voltage, when the alternating current input is lower than a set voltage, a relay coil driving circuit is started, a relay contact is attracted, and a double-voltage boosting circuit works; when the alternating current input is higher than the set voltage, no current flows through the relay coil, the contact is loosened, and the double voltage boosting circuit stops working, and the method further comprises the following steps:
An input voltage detection circuit formed by the voltage dividing resistors of R21, R22, R14, R9 detects an input voltage.
The voltage after alternating current rectification is detected to be compared with a reference voltage, when the alternating current input is lower than a set voltage, a relay coil driving circuit is started, a relay contact is attracted, and a double-voltage boosting circuit works; when the alternating current input is higher than the set voltage, no current flows through the relay coil, the contact is loosened, and the double voltage boosting circuit stops working, and the method further comprises the following steps:
the upper end of R9 is connected with the base electrode of triode Q12, and the conducting voltage of triode corresponds to the set point of input voltage.
The voltage after alternating current rectification is detected to be compared with a reference voltage, when the alternating current input is lower than a set voltage, a relay coil driving circuit is started, a relay contact is attracted, and a double-voltage boosting circuit works; when the alternating current input is higher than the set voltage, no current flows through the relay coil, the contact is loosened, and the double voltage boosting circuit stops working, and the method further comprises the following steps:
r11, C1, ZD8, C20, R6 and Q1 are relay coil driving circuits.
The voltage after alternating current rectification is detected to be compared with a reference voltage, when the alternating current input is lower than a set voltage, a relay coil driving circuit is started, a relay contact is attracted, and a double-voltage boosting circuit works; when the alternating current input is higher than the set voltage, no current flows through the relay coil, the contact is loosened, and the double voltage boosting circuit stops working, and the method further comprises the following steps:
ZD1 is a pull-down zener diode, when Q12 is conducted, the voltage of C1 is pulled down through ZD1, ZD8 is cut off, Q1 is also cut off, a relay contact is tripped, an electronic switch is disconnected, and the double voltage rectifying circuit stops working.
The voltage after alternating current rectification is detected to be compared with a reference voltage, when the alternating current input is lower than a set voltage, a relay coil driving circuit is started, a relay contact is attracted, and a double-voltage boosting circuit works; when the alternating current input is higher than the set voltage, no current flows through the relay coil, the contact is loosened, and the double voltage boosting circuit stops working, and the method further comprises the following steps:
When the alternating current input voltage is lower than the set voltage, Q12 is cut off, ZD1 is cut off, ZD8 is conducted, Q1 is conducted, the relay contacts are attracted, and the double voltage rectifying circuit works.
The invention provides a high-low voltage automatic switching electronic switch circuit, which comprises: the control part of the switching circuit is in the low-voltage low-current weak current part, the L or N strong current circuit is switched on or off by controlling the attraction or release of the contact of the relay, the control part comprises the steps of comparing the voltage after alternating current rectification with a reference voltage by detecting, when the alternating current input is lower than the set voltage, starting the relay coil driving circuit, attracting the contact of the relay, and operating the double-voltage boosting circuit; when the alternating current input is higher than the set voltage, no current flows through the relay coil, the contacts are loosened, and the double voltage boosting circuit stops working, so that the silicon controlled electronic switch with far higher reliability than the existing scheme is realized, and the reliable, low-cost and intelligent automatic electronic switch circuit is realized.
The high-low voltage automatic switching electronic switching circuit provided by the invention is characterized in that L/N power taking is rectified and filtered by BD2, D7 and C4, and then voltage is stabilized to be about 24VDC through a voltage-reducing and stabilizing circuit formed by R1, Q2, D6, ZD7, R21, R22 and R15.
When the alternating-current low voltage is input, for example, 110VAC, the relay contacts are closed, the L line is connected to the midpoint of C3 and C6, and the voltage on the same rectified voltage C3 is superposed on the voltage of C6, namely, the voltage is doubled, for example, about 310VDC, and is close to 220VAC input rectified voltage.
When alternating high voltage is input, such as 220VAC, the switch Q1 of the switch circuit is cut off, the relay contact is tripped, the L line cannot be connected to the midpoint of C3 and C6, the voltage doubling step-up circuit cannot be formed, and the rectified voltage is output, such as about 310VDC.
The high-low voltage automatic switching electronic switching circuit provided by the invention can be used in a voltage doubling booster circuit of a switching power supply, can also be used in other undervoltage or overvoltage protection circuits, and has the advantages of strong practicability, low cost, stability, safety and reliability.
The high-low voltage automatic switching electronic switching circuit provided by the invention has the advantages that the voltage of the input end of the transformer keeps the high-voltage floating amplitude not large in the whole high-low voltage input range, so that the transformer can be converted with high efficiency when working in the whole input voltage range, and the energy is saved and the consumption is reduced.
In the several embodiments provided in the present invention, it should be understood that the disclosed circuit may be implemented in other ways. For example, the circuit embodiments described above are merely illustrative, e.g., the division of circuits or components is merely a logical function division, and there may be additional divisions when actually implemented, e.g., multiple circuits or components may be combined or integrated into another circuit system, or some features may be omitted, or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, circuits or components, which may be in electrical, mechanical or other form.
The components described as separate components may or may not be physically separate, and components or circuits described as unit components may or may not be physical units, may be located in one place, or may be distributed over a plurality of circuit units. Some or all of the circuits or components may be selected according to actual needs to achieve the purpose of this embodiment.
In addition, each functional circuit in each embodiment of the present invention may be integrated into one processing circuit, each unit circuit or component may exist alone physically, or two or more unit circuits or components may be integrated into one unit circuit or component. The integrated unit circuits or components described above may be implemented in hardware.
The integrated unit circuits or components may be stored in a computer readable storage medium if implemented in the form of hardware functional units and sold or used as a stand alone product. Based on such understanding, the technical solution of the present invention may be embodied in essence or a part contributing to the prior art or all or part of the technical solution in the form of a software product stored in a storage medium, including several instructions to cause a computer device (which may be a personal computer, a server, or a network device, etc.) or a processor (processor) to execute all or part of the steps of the embodiments of the present invention. And the aforementioned storage medium includes: a usb disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
The foregoing description is only a partial embodiment of the present invention, and is not intended to limit the scope of the present invention, and all equivalent devices or equivalent processes using the descriptions and the drawings of the present invention or directly or indirectly applied to other related technical fields are included in the scope of the present invention.
Claims (7)
1. An electronic switching circuit for automatically switching between high and low voltages, comprising:
The switching circuit control part is used for switching on or off an L or N strong current circuit in a low-voltage low-current weak current part by controlling the on or off of contacts of the relay;
Comparing the voltage after AC rectification with a reference voltage, and starting a relay coil driving circuit when the AC input is lower than a set voltage, wherein a relay contact is attracted, and a double-voltage boosting circuit works; when the alternating current input is higher than the set voltage, no current flows through the relay coil, the electric shock is released, and the double voltage boosting circuit stops working;
wherein, high low pressure automatic switching electronic switch circuit includes: transistor Q12, pull-down zener diode ZD1; the relay coil driving circuit includes: a zener diode ZD8, a triode Q1, and a capacitor C1;
The collector of the triode Q12 is connected with the positive electrode of the pull-down zener diode ZD1, and the emitter of the triode Q12 is grounded;
The negative electrode of the zener diode ZD8 is connected with the negative electrode of the pull-down zener diode ZD1, and the positive electrode of the zener diode ZD8 is connected with the base electrode of the triode Q1;
The collector of the triode Q1 is connected with the relay coil, and the emitter of the triode Q1 is grounded;
The positive electrode of the capacitor C1 is connected between the pull-down zener diode ZD1 and the zener diode ZD8, and the negative electrode of the capacitor C1 is grounded;
The voltage after alternating current rectification is detected to be input through the base electrode of the triode Q12, the reference voltage is the conducting voltage of the triode Q12, when the alternating current input is higher than the set voltage, the voltage of the capacitor C1 is pulled down through the pull-down zener diode ZD1 when the triode Q12 is conducted, the zener diode ZD8 is cut off, the triode Q1 is also cut off, a relay contact is disconnected, an electronic switch is disconnected, and the double voltage rectification circuit stops working;
When the alternating current input voltage is lower than the set voltage, the triode Q12 is cut off, the pull-down voltage stabilizing diode ZD1 is cut off, the voltage stabilizing diode ZD8 is conducted, the triode Q1 is conducted, the relay contacts are attracted, and the double voltage rectifying circuit works.
2. The automatic switching electronic switching circuit of high and low voltage according to claim 1, wherein the voltage after rectification by detecting alternating current is compared with a reference voltage, when the alternating current input is lower than a set voltage, a relay coil driving circuit is started, a relay contact is attracted, and a double voltage boosting circuit works; when the alternating current input is higher than the set voltage, no current flows through the relay coil, the contact is loosened, and the double voltage boosting circuit stops working, and the method comprises the following steps:
when the switching circuit works, the relay contacts are closed, the L line is connected to the midpoints of C3 and C6, and the voltage on the same rectified voltage C3 is superposed on the voltage of C6 to form a doubling voltage.
3. The automatic switching electronic switching circuit of high and low voltage according to claim 1, wherein the voltage after rectification by detecting alternating current is compared with a reference voltage, when the alternating current input is lower than a set voltage, a relay coil driving circuit is started, a relay contact is attracted, and a double voltage boosting circuit works; when the alternating current input is higher than the set voltage, no current flows through the relay coil, the contact is loosened, and the double voltage boosting circuit stops working, and the method further comprises the following steps:
When alternating-current high voltage is input, the switch circuit switch Q1 is cut off, the relay contact is tripped, the L line cannot be connected to the midpoints of C3 and C6, the voltage doubling step-up circuit cannot be formed, and rectified voltage is output.
4. The automatic switching electronic switching circuit of high and low voltage according to claim 1, wherein the voltage after rectification by detecting alternating current is compared with a reference voltage, when the alternating current input is lower than a set voltage, a relay coil driving circuit is started, a relay contact is attracted, and a double voltage boosting circuit works; when the alternating current input is higher than the set voltage, no current flows through the relay coil, the contact is loosened, and the double voltage boosting circuit stops working, and the method further comprises the following steps:
The L/N power supply is rectified and filtered by BD2, D7 and C4, and then the voltage is stabilized at a preset value by a voltage-reducing and stabilizing circuit formed by R1, Q2, D6, ZD7, R21, R22 and R15.
5. The automatic switching electronic switching circuit of high and low voltage according to claim 1, wherein the voltage after rectification by detecting alternating current is compared with a reference voltage, when the alternating current input is lower than a set voltage, a relay coil driving circuit is started, a relay contact is attracted, and a double voltage boosting circuit works; when the alternating current input is higher than the set voltage, no current flows through the relay coil, the contact is loosened, and the double voltage boosting circuit stops working, and the method further comprises the following steps:
An input voltage detection circuit formed by the voltage dividing resistors of R21, R22, R14, R9 detects an input voltage.
6. The automatic switching electronic switching circuit of high and low voltage according to claim 1, wherein the voltage after rectification by detecting alternating current is compared with a reference voltage, when the alternating current input is lower than a set voltage, a relay coil driving circuit is started, a relay contact is attracted, and a double voltage boosting circuit works; when the alternating current input is higher than the set voltage, no current flows through the relay coil, the contact is loosened, and the double voltage boosting circuit stops working, and the method further comprises the following steps:
the upper end of R9 is connected with the base electrode of triode Q12, and the conducting voltage of triode corresponds to the set point of input voltage.
7. The automatic switching electronic switching circuit of high and low voltage according to claim 1, wherein the voltage after rectification by detecting alternating current is compared with a reference voltage, when the alternating current input is lower than a set voltage, a relay coil driving circuit is started, a relay contact is attracted, and a double voltage boosting circuit works; when the alternating current input is higher than the set voltage, no current flows through the relay coil, the contact is loosened, and the double voltage boosting circuit stops working, and the method further comprises the following steps:
r11, C1, ZD8, C20, R6 and Q1 are relay coil driving circuits.
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| CN201810505294.1A CN108768357B (en) | 2018-05-24 | 2018-05-24 | High-low voltage automatic switching electronic switch circuit |
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| CN201810505294.1A CN108768357B (en) | 2018-05-24 | 2018-05-24 | High-low voltage automatic switching electronic switch circuit |
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| CN207269145U (en) * | 2017-09-07 | 2018-04-24 | 杭州优迈科技有限公司 | A kind of protection circuit against input over-voltage for Switching Power Supply |
| CN208691209U (en) * | 2018-05-24 | 2019-04-02 | 深圳日辉达电源股份有限公司 | A kind of high-low pressure automatic switchover electronic switching circuit |
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2018
- 2018-05-24 CN CN201810505294.1A patent/CN108768357B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101414193A (en) * | 2007-10-16 | 2009-04-22 | 鸿富锦精密工业（深圳）有限公司 | Power supply automatic switchover circuit |
| DE102009008432A1 (en) * | 2009-02-11 | 2010-08-12 | Robert Bosch Gmbh | Low voltage supply device for e.g. gas thermal controller, has transformer comprising primary winding such that transformer is adapted for performance requirement of electrical devices |
| CN201623677U (en) * | 2010-02-09 | 2010-11-03 | 中山大洋电机制造有限公司 | Control circuit of single-phase alternating-current motor for clothes dryers |
| CN201922151U (en) * | 2010-09-10 | 2011-08-10 | 吴敏 | Automatic regulation controller of power supply of alternating current electric welding machine |
| CN207269145U (en) * | 2017-09-07 | 2018-04-24 | 杭州优迈科技有限公司 | A kind of protection circuit against input over-voltage for Switching Power Supply |
| CN208691209U (en) * | 2018-05-24 | 2019-04-02 | 深圳日辉达电源股份有限公司 | A kind of high-low pressure automatic switchover electronic switching circuit |
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| CN108768357A (en) | 2018-11-06 |
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