Circuit for adjusting output power along with input voltage

Abstract

The utility model relates to the technical field of voltage power regulation, in particular to a circuit for regulating output power along with input voltage, which comprises a rectifier module, a sampling module, a reference module and a control module which are connected in sequence, the reference module compares a collected input voltage signal with a reference voltage built in the voltage stabilizer U10, the reference voltage is compared with sampling voltage signals obtained after voltage division of resistors R98, R99, R100 and R101, and the control module adjusts the photoelectric coupler U9 to turn on and turn off the MOS tube Q11 according to the comparison result of the input voltage signal and the reference signal. The voltage signal of the pin 5 of the U5 is further changed, the output current output power is adjusted, the charger has different output current output power according to different input voltages, the high-voltage product performance of a single product is exerted, the circuit elements are simple, the working efficiency is high, the size is small, and safety certification of all regions can be conveniently obtained.

Description

Technical Field

[0001] The present application relates to the technical field of voltage power regulation, and in particular to a circuit for adjusting output power following input voltage. Background Art

[0002] With the development of technology, there are many kinds of electronic products used in all aspects of life, and corresponding to different charging needs. Usually, electronic devices are equipped with corresponding chargers. In daily life, there may be cross-use of electronic product chargers or different input voltages.

[0003] In the prior art, chargers adapted for electronic devices generally comply with safety and regulatory requirements in low-voltage areas, and cannot adjust output power according to input voltages in different regions. Single products cannot fully exert the performance of high-voltage products, and the products are large in size and high in cost. Utility Model Content

[0004] In order to solve the above technical problems, the present application provides a circuit for adjusting output power following input voltage, comprising a rectifier module, a sampling module, a reference module, and a control module connected in sequence, wherein the sampling module is used to collect the input voltage signal processed by the rectifier module, the reference module is used to compare the input voltage signal with the reference signal, and the control module adjusts the current output power according to the comparison result between the input voltage signal and the reference signal, thereby realizing the ability of the charger to have different output current output power for different input voltages, thereby giving full play to the high voltage product performance of the single product.

[0005] Preferably, the rectifier module includes diodes D2 and D3, which are used to rectify the input current respectively. By rectifying the input single-phase voltage AC into a stable DC voltage, a stable output current and output power are achieved, thereby improving the performance of the product.

[0006] Preferably, the sampling module includes resistors R98, R99, R100 and R101 connected in series, and a capacitor C58 connected in parallel to the resistor R101. The capacitor C58 connected in parallel to the resistor R101 is used to filter the sampled voltage signal to prevent interference. Multiple voltage-dividing resistors are provided to avoid voltage overload due to too few voltage-dividing resistors, thereby causing voltage breakdown of the voltage-dividing resistors.

[0007] Preferably, the reference module includes a voltage regulator U10, a photocoupler U9 connected to the control module and the voltage regulator U10, and a resistor R102 connected to the anode of the diode at the A end of the photocoupler U9. One end of the voltage regulator U10 is connected to the resistor R100 and the capacitor C58 of the sampling module. The voltage regulator U10 has a built-in 2.5V reference voltage. The reference voltage is compared with the sampled electrical signal after the voltage is divided by resistors R98, R99, R100 and R101, and then the conduction and cutoff of the photocoupler U9 connected to the control end 3 of the voltage regulator U10 are adjusted, so that the charger has different output current and output power capabilities for different input voltages, thereby exerting the high-voltage product performance of the single product.

[0008] Preferably, the control module includes a MOS tube Q11 and a resistor R103 connected to the collector of the B-end transistor of the photocoupler U9, a resistor R104 connected to the emitter of the B-end transistor of the photocoupler U9, a resistor R70 and a resistor R79 connected in series with the MOS tube Q11, and an adjusting switch U5.

[0009] From the above, it can be seen that the application provided by the present application can obtain the following beneficial effects: it includes a rectifier module, a sampling module, a reference module, and a control module connected in sequence, the sampling module is used to collect the input voltage signal processed by the rectifier module, the input current is first processed by the rectifier module, the reference module is used to compare the input voltage signal with the reference signal, after the input voltage signal is compared with the reference module, the control module adjusts the current output power according to the comparison result between the input voltage signal and the reference signal, and then adjusts the output current output power, so as to realize the ability of the charger to have different output current output power for different input voltages, give full play to the high voltage product performance of the single product, the circuit components are simple, the working efficiency is high, the size is small, and it is convenient to obtain safety certification in various regions. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings required for use in the description of the embodiments of the present application or the prior art are briefly introduced below. Obviously, the drawings described below are only part of the embodiments of the present application, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor.

[0011] Figure 1 A module diagram of an embodiment of the present application;

[0012] Figure 2 This is a circuit diagram of a sampling and comparison control module according to an embodiment of the present application;

[0013] Figure 3This is a circuit diagram of a rectifier module according to an embodiment of the present application. DETAILED DESCRIPTION

[0014] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0015] In the prior art, chargers adapted for electronic devices generally comply with safety and regulatory requirements in low-voltage areas, and cannot adjust output power according to input voltages in different regions. Single products cannot fully exert the performance of high-voltage products, and the products are large in size and high in cost.

[0016] In order to solve the above technical problems, this embodiment provides a circuit for adjusting output power following input voltage, such as Figure 1 As shown, it includes a rectifier module, a sampling module, a reference module, and a control module connected in sequence. The sampling module is used to collect the input voltage signal processed by the rectifier module. The input current is first rectified by the rectifier module. The reference module is used to compare the input voltage signal with the reference signal. After the input voltage signal is compared with the reference module, the control module adjusts the current output power according to the comparison result between the input voltage signal and the reference signal, and then adjusts the output current output power, so that the charger has the ability to have different output current output power for different input voltages, thereby giving full play to the high voltage product performance of the single product. The circuit components are simple, the working efficiency is high, and the size is small, which is convenient for obtaining safety certification in various regions.

[0017] Further, such as Figure 3 As shown, the rectifier module includes diodes D2 and D3, which are used to rectify the input current respectively. The input single-phase voltage AC is rectified into a stable DC voltage through diodes D2 and D3, so as to achieve a stable output current and output power, thereby improving the performance of the product and further exerting the high voltage product performance of the single product.

[0018] Further, such as Figure 2As shown, the sampling module includes resistors R98, R99, R100 and R101 connected in series in sequence, and a capacitor C58 connected in parallel to the resistor R101. The resistor R101 connected in parallel with the capacitor C58 is a sampling resistor. By adding the capacitor C58, the sampled voltage signal is filtered to prevent interference. The remaining resistors R98, R99, and R100 are voltage divider resistors. For different voltage samplings, different numbers of voltage divider resistors and their resistance values ​​can be set, and no additional cost is added. The sampling resistor is designed according to the collected voltage value, and the loss generated is small. A plurality of voltage divider resistors are set to avoid voltage overload due to too few voltage divider resistors, thereby causing voltage breakdown of the voltage divider resistor.

[0019] Further, the reference module includes a voltage stabilizer U10, a photoelectric coupler U9 connected to the control module and the voltage stabilizer U10, the photoelectric coupler U9 includes a diode U9-A and a transistor U9-B end, the positive electrode of the diode U9-A is connected to a resistor R102, the voltage stabilizer U10 includes a sampling end 1, a ground end 2 and a control end 3, and the sampling end 1 of the voltage stabilizer U10 is connected to the resistor R100 and the capacitor C58 of the sampling module. The positive electrode of the diode U9-A end of the photoelectric coupler U9 is connected to a resistor R102, and the resistor R102 is used to adjust the current control of the diode U9-A and the voltage stabilizer U10. The voltage regulator U10 has a built-in 2.5V reference voltage. The reference signal is compared with the sampled electrical signal after voltage division by resistors R98, R99, R100 and R101, and then the on and off status of the photocoupler U9 connected to the control terminal 3 of the voltage regulator U10 is adjusted, so that the charger can have different output current and output power for different input voltages, thereby giving full play to the high voltage product performance of the single product.

[0020] Furthermore, the control module includes a MOS tube Q11 and a resistor R103 connected to the collector of the transistor at the B end of the photocoupler U9, a resistor R104 connected to the emitter of the transistor at the B end of the photocoupler U9, a resistor R70 and a resistor R79 connected in series with the MOS tube Q11, and an adjustment switch U5. The MOS tube Q11 includes a G level, an S level, a D level and a B level, the collector of the transistor U9-B end is connected to the resistor R103 and the G level of the MOS tube Q11, and the D level of the MOS tube Q11 is connected in series with the resistor R79. When the comparison result between the sampling module and the reference module is a high voltage signal, the voltage regulator U10 is turned on, and the photocoupler U9 disconnects the resistor R79 connected in series with the D level of the MOS tube Q11 from the resistor R70, thereby increasing the voltage of the 5th pin of the adjustment switch U5, and increasing the output current and output power of the product. The voltage value of the B level of the MOS tube Q11 is adjusted by resistors R103 and R104, and the working state of Q11 is adjusted in cooperation with the photocoupler U9, so that the charger can have different output current and output power for different input voltages, thereby giving full play to the high voltage product performance of the single product.

[0021] The circuit principle of the utility model for adjusting the output power following the input voltage is: the input single-phase voltage is rectified into a DC voltage through diodes D2 and D3, and resistors R98, R99, R100, and R101 collect the input voltage signal of the product and compare it with the reference signal of the reference module voltage regulator U10. The opening and closing of the actual voltage regulator U10 determines the opening and closing of the MOS tube Q11 by the photoelectric coupler U9, and the resistor R79 is connected to the resistor R70, thereby changing the voltage signal of the 5th foot of U5, so as to realize the ability to adjust the output current and output power of the product.

[0022] When the input voltage is high, it is rectified by diodes D2 and D3, and the input voltage signal collected by resistors R98, R99, R100, and R101 is high, the reference module U10 is turned on, the photocoupler U9 works, and the MOS tube Q11 is turned off to disconnect the resistor R79 from U5, so that the voltage signal at pin 5 of U5 increases, and the output current and output power of the product increase.

[0023] When the input voltage is low, it is rectified by diodes D2 and D3, and the input voltage signal collected by resistors R98, R99, R100, and R101 is low. The reference module regulator U10 is turned off, the photocoupler U9 does not work, and the MOS tube Q11 is turned on to connect the resistor R79 to U5, so that the voltage signal at pin 5 of U5 is reduced, and the output current and output power of the product are reduced.

[0024] The above-described implementation methods do not constitute a limitation on the protection scope of the technical solution. Any modification, equivalent replacement and improvement made within the spirit and principle of the above-described implementation methods shall be included in the protection scope of the technical solution.

Claims

1. A circuit for adjusting output power according to input voltage, characterized in that: It includes a rectifier module, a sampling module, a reference module, and a control module connected in sequence, wherein the sampling module is used to collect the input voltage signal processed by the rectifier module, the reference module is used to compare the input voltage signal with the reference signal, and the control module adjusts the current output power according to the comparison result between the input voltage signal and the reference signal; The reference module includes a voltage stabilizer U10, a photoelectric coupler U9 connected to the control module and the voltage stabilizer U10, and a resistor R102 connected to the anode of the diode at the A end of the photoelectric coupler U9, and one end of the voltage stabilizer U10 is connected to the resistor R100 and the capacitor C58 of the sampling module; The control module includes a MOS transistor Q11 and a resistor R103 connected to the collector of the B-end transistor of the photocoupler U9, a resistor R104 connected to the emitter of the B-end transistor of the photocoupler U9, a resistor R70 and a resistor R79 connected in series with the MOS transistor Q11, and an adjustment switch U5.

2. The circuit for adjusting output power according to input voltage according to claim 1, characterized in that: The rectifier module includes diodes D2 and D3, which are used to rectify the input current respectively.

3. The circuit for adjusting output power according to input voltage according to claim 1, characterized in that: The sampling module includes resistors R98 , R99 , R100 , and R101 connected in series end to end, and a capacitor C58 connected in parallel with the resistor R101 .

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