Dual-voltage input self-adaptive voltage-multiplying switching power supply circuit

Abstract

The invention belongs to the technical field of switching power supplies, and particularly relates to a dual-voltage input self-adaptive voltage-multiplying switching power supply circuit. The rectifying circuit is connected with the electronic switch and the load after being connected with 90-264V alternating current, the electronic switch is connected with the voltage doubling circuit and then connected to the load, the voltage doubling circuit is connected with the control circuit through the output detection feedback circuit, the control circuit controls the electronic switch after receiving feedback signals, a power supply circuit is integrated on the control circuit, and the power supply circuit is connected with the electronic switch through the output detection feedback circuit. The power supply circuit is connected with the output end of the voltage doubling circuit; the electronic switch is composed of a silicon controlled rectifier electronic switch circuit and a relay electronic switch circuit. Therefore, two self-adaptive voltage-multiplying switching power supply circuits with different structures are formed. Under the condition of double input voltages, the input voltage is automatically recognized, and stable single direct current voltage is provided for a load through different circuit links.

Description

Technical Field

[0001] The invention belongs to the technical field of switching power supplies, and in particular relates to a dual-voltage input adaptive voltage-doubling switching power supply circuit. Background Art

[0002] A switching power supply is a commonly used circuit in the field of integrated circuits. Among them, the flyback switching power supply occupies a very important position in low-power switching power supplies due to its simple structure, small size, and multi-channel output advantages. Traditional switching power supply circuits require a relatively stable single DC voltage. When the input is a dual voltage, the input voltage needs to be processed into a single voltage first, which greatly increases the response time of the switching power supply and is unstable. In view of the above problems, a dual-voltage input adaptive voltage-doubling switching power supply circuit is provided. Summary of the Invention

[0003] To solve the defects and deficiencies of the prior art; the purpose of the present invention is to provide a dual-voltage input adaptive voltage-doubling switching power supply circuit with a simple structure, reasonable design, and convenient use. It realizes automatic identification of the input voltage under the condition of dual input voltages, and provides a stable single DC voltage to the load through different circuit links.

[0004] To achieve the above object, the technical solution adopted by the present invention is: it includes a rectification circuit, an electronic switch, a voltage-doubling circuit, a control circuit, a load, an output detection feedback circuit, and a power supply circuit; the rectification circuit is connected to an alternating current of 90-264V and is respectively connected to the electronic switch and the load. The electronic switch is connected to the voltage-doubling circuit and then connected to the load, and the voltage-doubling circuit is connected to the control circuit through the output detection feedback circuit. The control circuit controls the electronic switch after receiving the feedback signal, and a power supply circuit is integrated on the control circuit. The power supply circuit is connected to the output end of the voltage-doubling circuit; wherein, the electronic switch is composed of a thyristor electronic switch circuit and a relay electronic switch circuit; thus, two different structures of adaptive voltage-doubling switching power supply circuits are formed.

[0005] Preferably, the thyristor electronic switch circuit includes a capacitor one, a resistor three, a resistor six, a resistor seven, and a diode one; the external connection terminal one of the thyristor electronic switch circuit is respectively connected to the capacitor, the diode one, and the resistor six. The capacitor one is connected in series with the resistor three and then connected to the external connection terminal two. The negative terminal of the diode one is divided into two paths. One path is connected to the external connection terminal two, and the other path is respectively connected to the resistor seven and the pulse signal terminal one. The other end of the resistor six is connected to the pulse signal terminal two.

[0006] Preferably, the thyristor electronic switch circuit can be replaced by a relay electronic switch circuit to transform into an adaptive voltage-doubling relay power supply circuit; the relay electronic switch circuit includes a relay and a diode D2. The two ends of the induction coil in the relay are respectively connected to the pulse signal terminal 3 and the 12V voltage. A diode D2 is connected between the pulse signal terminal 3 and the 12V voltage, and the conduction direction of the diode D2 is from the pulse signal terminal 3 to the 12V voltage. The control switch in the relay is respectively connected between the external connection terminals 3 and 4 of the thyristor electronic switch circuit.

[0007] Preferably, when the thyristor electronic switch circuit is used as the control switch of the adaptive voltage-doubling switch power supply, the single-chip microcomputer U5 in the control circuit is replaced by a triode. The collector of the triode is connected to the pulse signal terminal 3, the emitter of the triode is grounded, the base of the triode is connected to the resistor R10, and the two ends of the ceramic capacitor C7 are connected in parallel with the resistor R14.

[0008] Preferably, when the thyristor electronic switch circuit is used as the control switch of the adaptive voltage-doubling switch power supply, the resistor R13 and the ceramic capacitor C3 in the power supply circuit are respectively connected to the 3rd pin and the 1st pin of the chip U1. The 2nd pin of the chip U1 is grounded, and the common power supply terminal of the power supply circuit is connected to the 12V voltage.

[0009] After adopting the above structure, the beneficial effects of the present invention are as follows: It realizes the replacement of the traditional DIP switch method to manually select the input voltage under the condition of dual input voltages; it automatically identifies the input voltage and completes the task of providing a stable single DC voltage to the load through different circuit links. Description of the Drawings

[0010] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the present invention will be described in detail by the following specific embodiments and the accompanying drawings.

[0011] Figure 1 It is the structural schematic diagram of the present invention; Figure 2 It is the circuit diagram of the adaptive voltage-doubling thyristor switch power supply of the present invention; Figure 3 It is the circuit diagram of the adaptive voltage-doubling relay switch power supply of the present invention; Description of the reference numerals in the drawings: Rectifier circuit 1, Electronic switch 2, Voltage-doubling circuit 3, Control circuit 4, Load 5, Output detection and feedback circuit 6, Power supply circuit 7, Thyristor electronic switch circuit 21 and Relay electronic switch circuit 22. Detailed Embodiments

[0012] To make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be described below through specific embodiments shown in the accompanying drawings. However, it should be understood that these descriptions are merely exemplary and are not intended to limit the scope of the present invention. In addition, in the following description, descriptions of well-known structures and technologies are omitted to avoid unnecessarily confusing the concepts of the present invention.

[0013] Here, it should also be noted that in order to avoid obscuring the present invention with unnecessary details, only the structures and / or processing steps closely related to the solution according to the present invention are shown in the drawings, while other details less relevant to the present invention are omitted.

[0014] See Figure 1 、 Figure 2 As shown, the following technical solutions are adopted in this specific embodiment: It includes a rectifier circuit 1, an electronic switch 2, a voltage multiplier circuit 3, a control circuit 4, a load 5, an output detection and feedback circuit 6, and a power supply circuit 7; the rectifier circuit 1 is connected to an alternating current of 90 - 264V and then connected to the electronic switch 2 and the load 5 respectively. The electronic switch 2 is connected to the voltage multiplier circuit 3 and then connected to the load 5, and the voltage multiplier circuit 3 is connected to the control circuit 4 through the output detection and feedback circuit 6. The control circuit 4 controls the electronic switch 2 after receiving the feedback signal, and a power supply circuit 7 is integrated on the control circuit 4. The power supply circuit 7 is connected to the output end of the voltage multiplier circuit 3; wherein, the electronic switch 2 is composed of a thyristor electronic switch circuit 21 and a relay electronic switch circuit 22; thus forming an adaptive voltage multiplier switch power supply circuit with two different structures.

[0015] Among them, the thyristor electronic switch circuit 21 includes a capacitor C1, a resistor R3, a resistor R6, a resistor R7, and a diode Q1; the external connection terminal A of the thyristor electronic switch circuit 21 is respectively connected to the capacitor C1, the diode Q1, and the resistor R6. The capacitor C1 is connected to the external connection terminal B after being connected in series with the resistor R3. The negative terminal of the diode Q1 is divided into two paths. One path is connected to the external connection terminal B, and the other path is respectively connected to the resistor R7 and the pulse signal terminal Dr1. The other end of the resistor R6 is connected to the pulse signal terminal Dr2.

[0016] Further, the voltage multiplier circuit 3 is composed of electrolytic capacitor one EC1, electrolytic capacitor three EC3, synthetic film resistor one RH1, synthetic film resistor three RH3, synthetic film resistor five RH5, and synthetic film resistor seven RH7. The electrolytic capacitor one EC1 and the electrolytic capacitor three EC3 are connected in series, and both ends are respectively connected between the positive terminal of the rectifier circuit 1 and the ground terminal; the synthetic film resistor one RH1, the synthetic film resistor three RH3, the synthetic film resistor five RH5, and the synthetic film resistor seven RH7 are connected in series, and both ends are respectively connected between the positive terminal of the rectifier circuit 1 and the ground terminal, and the connection is made between the electrolytic capacitor one EC1 and the electrolytic capacitor three EC3 and between the resistor three RH3 and the resistor five RH5.

[0017] Further, the output detection and feedback circuit 6 is composed of resistor one R1, resistor four R4, resistor eight R8, and ceramic capacitor two C2. The resistor one R1, the resistor four R4, and the resistor eight R8 are connected in series, and both ends are respectively connected between the positive terminal of the rectifier circuit 1 and the ground terminal. The ceramic capacitor two C2 is connected in parallel across the resistor eight R8.

[0018] Further, the control circuit 4 is composed of chip five U5, chip four U4, ceramic capacitor seven C7, and resistor ten R10; the 7th pin of the chip five U5 is connected in series with the resistor ten R10 and then respectively connected to the ceramic capacitor seven C7 and the 1st pin of the chip five U5. The other end of the ceramic capacitor seven C7 and the 2nd pin of the chip five U5 are grounded. The 4th pin and the 6th pin of the chip five U5 are connected to the signal terminal of the thyristor electronic switch circuit 21.

[0019] The working principle of this specific embodiment is as follows: The principle of this circuit is that after the input voltage passes through the rectifier circuit, the single-chip microcomputer control circuit detects the input voltage through the sampling circuit and judges the level of the input voltage. When the input is a high voltage (such as 220V), the electronic switch is closed, and the input voltage directly supplies power to the load through rectification and filtering. When the input is a low voltage (such as 110V), the electronic switch is opened. After the input voltage passes through the rectifier circuit, it enters the voltage multiplier circuit through the electronic switch, thereby rising to a high voltage and then supplying power to the load.

[0020] The working principle of the thyristor module is that the thyristor is turned off at an extremely low trigger level and turned on at an extremely high trigger level. When the thyristor module is turned on, it will enter the voltage multiplier circuit. The voltage boosting principle is that the positive half cycle of the AC voltage charges the EC1 capacitor, and the negative half cycle charges the EC3 capacitor. The load is discharged by the EC1 and EC3 capacitors together. The discharge voltage is the sum of the voltages of the two capacitors, that is, twice the input voltage.

[0021] See Figure 3, the difference of this specific embodiment is that: the thyristor electronic switch circuit 21 can be replaced with a relay electronic switch circuit 22 to transform into an adaptive voltage-doubling relay power supply circuit; the relay electronic switch circuit 22 includes a relay K1 and a diode Q3. The two ends of the induction coil in the relay K1 are respectively connected to the pulse signal terminal Drv and the 12V voltage, and a diode Q3 is connected between the pulse signal terminal Drv and the 12V voltage. The conduction direction of the diode Q3 is from the pulse signal terminal Drv to the 12V voltage. The control switch in the relay K1 is respectively connected between the external connection terminal C and the external connection terminal D of the thyristor electronic switch circuit 21.

[0022] In addition, the single-chip microcomputer U5 in the control circuit 4 is replaced with a triode Q2. The collector of the triode Q2 is connected to the pulse signal terminal Drv, the emitter of the triode Q2 is grounded, the base of the triode Q2 is connected to a resistor R10, and a resistor R14 is connected in parallel at both ends of the ceramic capacitor C7; when the thyristor electronic switch circuit 21 is used as an adaptive voltage-doubling switch power supply control switch, a resistor R13 and a ceramic capacitor C3 in the power supply circuit 7 are respectively connected to the 3rd corresponding pin and the 1st pin of the chip U1. The 2nd pin of the chip U1 is grounded, and the common power supply terminal of the power supply circuit 7 is connected to the 12V voltage.

[0023] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, it is intended to include all changes falling within the meaning and scope of the equivalent elements of the claims in the present invention.

[0024] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A dual-voltage input adaptive voltage-doubling switching power supply circuit, characterized in that: It includes a rectifier circuit, an electronic switch, a voltage multiplier circuit, a control circuit, a load, an output detection and feedback circuit, and a power supply circuit; the rectifier circuit is connected to an AC power supply of 90 - 264V and is respectively connected to the electronic switch and the load. The electronic switch is connected to the voltage multiplier circuit and then to the load, and the voltage multiplier circuit is connected to the control circuit through the output detection and feedback circuit. The control circuit controls the electronic switch after receiving the feedback signal, and a power supply circuit is integrated on the control circuit. The power supply circuit is connected to the output end of the voltage multiplier circuit; among them, the electronic switch is composed of a thyristor electronic switch circuit and a relay electronic switch circuit; thus, an adaptive voltage multiplier switch power supply circuit with two different structures is formed.

2. The dual-voltage input adaptive voltage-doubling switching power supply circuit according to claim 1, wherein: The thyristor electronic switch circuit includes capacitor one, resistor three, resistor six, resistor seven, and diode one; the external connection terminal one of the thyristor electronic switch circuit is respectively connected to the capacitor, diode one, and resistor six. Capacitor one is connected in series with resistor three and then connected to the external connection terminal two. The negative terminal of diode one is divided into two paths. One path is connected to the external connection terminal two, and the other path is respectively connected to resistor seven and pulse signal terminal one. The other end of resistor six is connected to pulse signal terminal two.

3. The dual-voltage input adaptive voltage-doubling switching power supply circuit according to claim 2, wherein: The thyristor electronic switch circuit can be replaced by a relay electronic switch circuit to transform into an adaptive voltage multiplier relay power supply circuit; the relay electronic switch circuit includes a relay and diode two. The two ends of the induction coil in the relay are respectively connected to pulse signal terminal three and 12V voltage, and a diode two is connected between pulse signal terminal three and 12V voltage. The conduction direction of diode two is from pulse signal terminal three to 12V voltage. The control switch in the relay is respectively connected between the external connection terminal three and external connection terminal four of the thyristor electronic switch circuit.

4. A dual-voltage input adaptive voltage-doubling switching power supply circuit according to claim 3, characterized in that: When the thyristor electronic switch circuit is used as the control switch of the adaptive voltage multiplier switch power supply, the single-chip microcomputer five in the control circuit is replaced by a triode. The collector of the triode is connected to pulse signal terminal three, the emitter of the triode is grounded, the base of the triode is connected to resistor ten, and resistor fourteen is connected in parallel at both ends of ceramic capacitor seven.

5. A dual-voltage input adaptive voltage-doubling switching power supply circuit according to claim 1, characterized in that: When the thyristor electronic switch circuit is used as the control switch of the adaptive voltage multiplier switch power supply, resistor thirteen and ceramic capacitor three in the power supply circuit are respectively connected to the 3rd corresponding pin and the 1st pin of chip one. The 2nd pin of chip one is grounded, and the common power supply terminal of the power supply circuit is connected to 12V voltage; when the thyristor electronic switch circuit is used as the control switch of the adaptive voltage multiplier switch power supply, resistor thirteen and ceramic capacitor three in the power supply circuit are respectively connected to the 3rd corresponding pin and the 1st pin of chip one. The 2nd pin of chip one is grounded, and the common power supply terminal of the power supply circuit is connected to 12V voltage.

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