Brand new voltage monitoring and high-low voltage free switching circuit
By designing a new voltage monitoring and high and low voltage free switching circuit, using zero crossing detection circuit and voltage regulation circuit, adaptive voltage regulation is achieved, and the problems of high and low voltage switching costs and large volume in the existing technology are solved, and the adaptive effect is achieved in different power grid environments is reduced, and production costs and inventory pressure are reduced.
Patent Information
- Application Number
- CN202422155302.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-03
- Publication Date
- 2025-06-20
- Estimated Expiration
- 2034-09-03
AI Technical Summary
In the prior art, high and low voltage switching usually depends on transformers, resulting in increased costs and larger product volume, which is not suitable for small household appliances, and is unable to achieve adaptive voltage regulation.
A new voltage monitoring and high and low voltage free switching circuit is designed. Adaptive voltage regulation is achieved through the zero crossing detection circuit and voltage regulation circuit between the neutral line ACN and live line ACL. Bidirectional trigger diodes DB1 and thyristor SCR2 are used to achieve adaptive voltage regulation.
This circuit can achieve adaptive effects at voltages across the world, reducing the inventory pressure of manufacturers, reducing costs and reducing product volume.
Smart Images
Figure CN223007480U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of adaptive circuits, and particularly relates to a brand-new voltage monitoring and high-low voltage free switching circuit. Background Technique
[0002] In the prior art, as Figure 1 shown, the scheme of adding a transformer in the circuit to realize high-low voltage switching easily increases the cost and occupies a larger volume space inside the product, and is not suitable for use in small household appliances. Currently, each manufacturer adopts a method of classified production and classified sales for such products. For example, if an order is for the European standard, the product is produced with reference to the European standard voltage (voltage: 230V, voltage frequency: 50Hz), and if an order is for the American standard, the product is produced according to the American standard voltage (voltage: 120V, voltage frequency: 60Hz). This way of producing by distinguishing voltages is not friendly to manufacturers and cannot perform adaptive voltage regulation according to the value of the input voltage.
[0003] Therefore, it is necessary to invent a brand-new voltage monitoring and high-low voltage free switching circuit to solve the above problems. Content of the Utility Model
[0004] In view of the above problems, the utility model provides a brand-new voltage monitoring and high-low voltage free switching circuit to solve the problems raised in the above background technique.
[0005] To achieve the above purpose, the utility model provides the following technical solutions:
[0006] A brand-new voltage monitoring and high-low voltage free switching circuit includes a neutral line ACN and a live line ACL. An over-zero detection circuit and a voltage regulation circuit are connected between the live line ACL and the neutral line ACN. The voltage regulation circuit includes a bidirectional trigger diode DB1 and a thyristor SCR2. The bidirectional trigger diode DB1 includes diodes D1, D2, D3, and D4. The positive electrode of diode D2 is connected to the neutral line ACN. The neutral line ACN is connected to the positive electrode of capacitor EC1 through diode D2. The negative electrode of capacitor EC1 is connected to pin 2 of thyristor SCR2. Pin 2 of thyristor SCR2 is connected to the positive electrode of capacitor EC3. The negative electrode of capacitor EC3 is connected to the positive electrode of diode D3. The live line ACL is connected to pin 1 of thyristor SCR2. The output voltage of the output end of the live line ACL is the output voltage + HVDC.
[0007] Further, pin 2 of the thyristor SCR2 is connected to pin 4 of optocoupler U10 through resistor R13, and pin 3 of the thyristor SCR2 is connected to pin 3 of optocoupler U10. Pin 2 of optocoupler U10 is grounded.
[0008] Further, pin 1 of the optocoupler U10 is connected to the buck-boost circuit L / H through the resistor R19.
[0009] Further, the zero-crossing detection circuit includes a chip U3. The live wire ACL is connected to the chip U3 through the resistor R17, the neutral wire ACN is connected to the chip U3 through the resistor R16, the output end of the chip U3 is connected to the zero-adjusting element ZERO through the resistor R20, and the input voltage 5V supplies power to the chip U3 through the resistor R18.
[0010] Further, a resistor R3 is connected in series between the neutral wire ACN and the live wire ACL.
[0011] Further, a resistor R1 and a resistor R4 are connected in series between the negative electrode of the diode D1 and the positive electrode of the diode D3.
[0012] Further, the AC voltage of the live wire ACL is fed into the VOL_AD circuit through the diode D1 and the resistor R5.
[0013] Technical effects and advantages of the present utility model:
[0014] 1. The present utility model can obtain the voltage range of the current power grid through the VOL_AD circuit. Through the cooperation of the thyristor SCR2 and the diac DB1, by controlling the value of the input end of the control circuit, the voltage required for the output voltage +HVDC can be obtained, achieving an adaptive effect under the power grid voltages of various countries in the world, and reducing the inventory pressure of manufacturers. Description of the Drawings
[0015] Figure 1 is the partial voltage circuit diagram in the prior art;
[0016] Figure 2 is the overall diagram of the brand-new voltage monitoring and high-low voltage free switching circuit in the embodiment of the present utility model. Detailed Embodiment
[0017] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions of the present utility model will be clearly and completely described below in conjunction with the embodiments.
[0018] The present utility model provides a brand-new voltage monitoring and high-low voltage free switching circuit, as Figure 2As shown, it includes a neutral line ACN and a live line ACL. An over-zero detection circuit and a voltage regulation circuit are connected between the live line ACL and the neutral line ACN. The voltage regulation circuit includes a bidirectional trigger diode DB1 and a thyristor SCR2. The bidirectional trigger diode DB1 includes diodes D1, D2, D3, and D4. The positive electrode of diode D2 is connected to the neutral line ACN. The neutral line ACN is connected to the positive electrode of capacitor EC1 through diode D2. The negative electrode of capacitor EC1 is connected to pin 2 of thyristor SCR2. Pin 2 of thyristor SCR2 is connected to the positive electrode of capacitor EC3. The negative electrode of capacitor EC3 is connected to the positive electrode of diode D3. The live line ACL is connected to pin 1 of thyristor SCR2. The output voltage of the live line ACL is the output voltage +HVDC. The voltage range of the current power grid can be obtained through the VOL_AD circuit. Through the cooperation of the thyristor SCR2 and the bidirectional trigger diode DB1, by controlling the value at the input end of the control circuit, the voltage required for the output voltage +HVDC can be obtained, achieving an adaptive effect under the voltage of power grids around the world and reducing the inventory pressure of manufacturers.
[0019] Pin 2 of the thyristor SCR2 is connected to pin 4 of optocoupler U10 through resistor R13, and pin 3 of the thyristor SCR2 is connected to pin 3 of optocoupler U10. Pin 2 of optocoupler U10 is grounded. Pin 1 of optocoupler U10 is connected to the buck-boost circuit L / H through resistor R19. The AC voltage of the live line ACL is fed into the VOL_AD circuit through diode D1 and resistor R5. The voltage range of the current power grid can be obtained through the VOL_AD circuit. Exemplarily, when the country where the whole circuit is used is in a low-voltage area, the boost part of the circuit is started through the buck-boost circuit L / H, the thyristor SCR2 is turned on, and the output voltage +HVDC at the output end is lifted by using the power storage capabilities of capacitor EC1 and capacitor EC3, so that the product connected to the output voltage +HVDC can work properly.
[0020] Among them, the over-zero detection circuit includes chip U3. The live line ACL is connected to chip U3 through resistor R17, and the neutral line ACN is connected to chip U3 through resistor R16. The output end of chip U3 is connected to the zero-adjusting element ZERO through resistor R20, and the input voltage of 5V supplies power to chip U3 through resistor R18. When the power grid is conducting, the frequency band of the current power grid can be accurately distinguished through the over-zero detection part of the circuit.
[0021] In Figure 2Among them, a resistor R3 is connected in series between the neutral line ACN and the live line ACL. The resistor R3 is used to prevent the direct connection between the neutral line ACN and the live line ACL from causing a short circuit. A resistor R1 and a resistor R4 are connected in series between the negative electrode of the diode D1 and the positive electrode of the diode D3. By setting the resistor R1 and the resistor R4, it is avoided that the live line ACL is directly connected to the neutral line ACN through the diode D1 and the diode D3.
[0022] The working principle of the present utility model:
[0023] Refer to Figure 2 As shown, when the country where the entire circuit is used is in a low-voltage area, the boost part of the circuit is started through the buck-boost circuit L / H, the thyristor SCR2 is turned on, and the output voltage +HVDC at the output end is lifted by using the power storage capabilities of the capacitors EC1 and EC3, so that the products connected to the output voltage +HVDC can work properly.
[0024] When boosting the low voltage: (under ideal conditions)
[0025] A. During the negative half-cycle, that is, when the neutral line ACN is positive and the live line ACL is negative, and the AC voltage is VAC, the AC voltage of the neutral line ACN charges the capacitor EC1 through the diode D2, and the AC voltage passes through the thyristor SCR2 circuit and is connected to the live line ACL to form a loop. At this time, the capacitor voltage value of the capacitor EC1 rises to VAC.
[0026] B. During the positive half-cycle, that is, when the live line ACL is positive and the neutral line ACN is negative, and the AC voltage is VAC. The AC voltage of the live line ACL charges the capacitor EC3 through the thyristor SCR2 and is connected to the neutral line ACN through the diode D3 to form a loop. At this time, the capacitor voltage value of the capacitor EC3 rises to VAC.
[0027] After charging for one positive and one negative half-cycle, the voltage of the output voltage +HVDC is maintained at 2VAC, and the voltage doubling of the entire circuit is realized.
[0028] The above embodiments are only used to illustrate the technical solutions of the present utility model, rather than to limit it.
Claims
1. A new type of voltage monitoring and high and low voltage free switching circuit, including neutral line ACN and live line ACL, characterized by: A zero-crossing detection circuit and a voltage regulating circuit are connected between the live wire ACL and the neutral wire ACN. The voltage regulating circuit includes a bidirectional trigger diode DB1 and a thyristor SCR2. The bidirectional trigger diode DB1 includes a diode D1, a diode D2, a diode D3 and a diode D4. The positive electrode of the diode D2 is connected to the neutral wire ACN. The neutral wire ACN is connected to the positive electrode of the capacitor EC1 through the diode D2. The negative electrode of the capacitor EC1 is connected to the pin 2 of the thyristor SCR2. The pin 2 of the thyristor SCR2 is connected to the positive electrode of the capacitor EC3. The negative electrode of the capacitor EC3 is connected to the positive electrode of the diode D3. The live wire ACL is connected to the pin 1 of the thyristor SCR2. The output terminal voltage of the live wire ACL is the output voltage +HVDC.
2. The new voltage monitoring and high and low voltage free switching circuit according to claim 1 is characterized in that: Pin 2 of the thyristor SCR2 is connected to pin 4 of the optocoupler U10 via resistor R13, and pin 3 of the thyristor SCR2 is connected to pin 3 of the optocoupler U10, and pin 2 of the optocoupler U10 is grounded.
3. The new voltage monitoring and high and low voltage free switching circuit according to claim 2 is characterized in that: Pin 1 of the optical coupler U10 is connected to the buck-boost circuit L / H via a resistor R19.
4. The new voltage monitoring and high and low voltage free switching circuit according to claim 1 is characterized in that: The zero-crossing detection circuit includes a chip U3, the live line ACL is connected to the chip U3 through a resistor R17, the neutral line ACN is connected to the chip U3 through a resistor R16, the output end of the chip U3 is connected to the zero adjustment element ZERO through a resistor R20, and the input voltage 5V is used to power the chip U3 through a resistor R18.
5. The new voltage monitoring and high and low voltage free switching circuit according to claim 1 is characterized in that: A resistor R3 is connected in series between the neutral line ACN and the live line ACL.
6. The new voltage monitoring and high and low voltage free switching circuit according to claim 1 is characterized in that: A resistor R1 and a resistor R4 are connected in series between the cathode of the diode D1 and the anode of the diode D3 .
7. The new voltage monitoring and high and low voltage free switching circuit according to claim 1 is characterized in that: The AC voltage of the live line ACL is passed to the VOL_AD circuit through the diode D1 and the resistor R5.
Citation Information
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