Direct-current voltage double-boosting rectifying circuit based on alternating-current signal

Abstract

The utility model relates to an amplifying and processing circuit based on an alternating current small signal. The utility model discloses a DC voltage double-boosting rectifying circuit based on an AC signal. The DC voltage double-boosting rectifying circuit comprises an AC signal double-boosting rectifying circuit and a signal driving circuit, wherein the alternating-current signal double-boosting rectifying circuit mainly comprises two capacitors and two diodes, and an input alternating-current signal voltage is converted and boosted into a direct-current signal by utilizing the charge-discharge and charge storage effects of a filter capacitor; aC signals are connected with the capacitor C1 through the damping / current-limiting adjusting resistor R1, and the other end of the capacitor C1 is connected with the common end of the double-diode D1; the other two ends of the double-diode D1 are connected with a capacitor C2, and the capacitor C2 outputs a voltage-multiplying signal and accesses the signal driving circuit. And the signal driving circuit adopts a low-bandwidth driving operational amplifier to amplify the voltage-multiplying signal output by the alternating-current signal double-boosting rectifying circuit, so that the boosted direct-current signal reliably drives a post-stage load. The utility model solves the problems of high cost and inconvenient debugging of a high-bandwidth operational amplifier in the prior art, and is economical and practical.

Description

Technical Field

[0001] This utility model relates to a small signal amplification and processing circuit, and more particularly to a low-cost DC voltage multiplier rectifier circuit based on AC signals. Background Technology

[0002] To obtain high DC voltage from weak AC small signals, traditional methods often use operational amplifier rectifier circuits. However, due to the limitation of the operational amplifier gain-bandwidth product, high-gain-bandwidth product operational amplifiers are expensive. Figure 2 The diagram shows a commonly used operational amplifier rectifier circuit in the prior art. It uses two operational amplifiers with a high gain-bandwidth product to rectify and amplify the signal. The circuit is expensive, and it is inconvenient to debug and adjust the multi-stage operational amplifiers. Sometimes there is a certain procurement and ordering cycle or special circumstances, which affects normal production.

[0003] In actual production, a relatively simple, low-cost AC signal voltage multiplier rectifier circuit based on voltage multiplier rectifier technology can be designed to meet product requirements and reduce costs. Obviously, this is beneficial to both supply and demand parties, and has certain social value, saving resources and being economical and environmentally friendly. Utility Model Content

[0004] This invention addresses the high production cost of existing operational amplifier rectification technology by proposing a simple and inexpensive small-signal AC multiplier rectifier amplifier circuit. In certain applications, it can replace the high-bandwidth gain product operational amplifiers required in existing technologies, solving their high cost and inconvenient debugging issues, making it economical and practical.

[0005] The technical solution adopted in this utility model is as follows:

[0006] A DC voltage multiplier rectifier circuit based on AC signals includes an AC signal multiplier rectifier circuit and a signal driving circuit. The AC signal multiplier rectifier circuit consists of two capacitors and two diodes. It utilizes the charging and discharging of the filter capacitors to store charge and convert the input AC signal voltage into a DC signal. Specifically, the AC signal is connected to one end of capacitor C1 through a damping / current limiting adjustment resistor R1, and the other end of capacitor C1 is connected to the common terminal of two diodes D1. The other two ends of the two diodes D1 are connected to capacitor C2, and one end of capacitor C2 outputs a multiplied signal that is connected to the signal driving circuit. The signal driving circuit uses a low-bandwidth driving operational amplifier U1 to amplify the multiplied signal output from the AC signal multiplier rectifier circuit, so that the boosted DC signal can reliably drive the subsequent load.

[0007] The DC voltage multiplier rectifier circuit based on AC signal has a low-bandwidth drive amplifier U1 whose fifth terminal is connected to the power supply voltage VDD and whose second terminal is connected to the power supply VEE; the inverting input terminal of U1 is connected to the connection node of resistors R3 and R4; the other end of resistor R4 is grounded and the other end of resistor R3 is connected to the output terminal SOUT of U1.

[0008] In the aforementioned DC voltage multiplier rectifier circuit based on AC signals, the non-inverting input terminal of the low-bandwidth drive operational amplifier U1 is connected to a bleed circuit resistor R2. The bleed circuit resistor R2 is connected in parallel with capacitor C2 to slowly release the residual signal voltage on capacitor C2 after the signal disappears or the power supply is cut off.

[0009] Beneficial effects of the utility model:

[0010] This invention designs a low-cost AC signal multiplier rectifier amplifier circuit. The circuit structure is simple, overcoming the shortcomings of existing operational amplifier rectifier circuits, such as high cost and inconvenient multi-stage operational amplifier debugging. It meets the requirements of industrial applications and significantly reduces production costs. Using basic electrical components (diodes, resistors, and capacitors), the AC signal from the previous stage is rectified using voltage multiplier technology to obtain a DC signal output greater than the original signal source. This is economical, practical, and reliable. Considering the design is based on no-load conditions and a stable signal, a commonly used, low-cost, low-bandwidth operational amplifier is added to compensate for the reduction or loss of output signal when a load is applied. The low-bandwidth operational amplifier is inexpensive. Attached Figure Description

[0011] Figure 1 The diagram shown is a schematic of the DC voltage multiplier rectifier circuit based on AC signals of this invention.

[0012] Figure 2 The diagram shown is a schematic of a common operational amplifier rectifier circuit in the prior art. Detailed Implementation

[0013] To make the technical concept and advantages of this invention clearer, the technical solution of this utility model will be further described in detail below with reference to the accompanying drawings. It should be understood that the following embodiments are merely preferred embodiments for explaining and illustrating this utility model, and should not be considered as, nor constitute a limitation on, the scope of patent protection claimed for this utility model. Example

[0014] See Figure 1 This utility model relates to a DC voltage multiplier rectifier circuit based on AC signals, comprising an AC signal multiplier rectifier circuit and a signal driving circuit. Among them,

[0015] AC signal multiplier rectifier circuit: It consists of two capacitors and two diodes. It uses the charging and discharging of the filter capacitor to store charge and convert the input AC signal voltage into a DC signal.

[0016] The AC signal is connected to one end of capacitor C1 through damping / current limiting adjustment resistor R1, and the other end of capacitor C1 is connected to the common terminal of dual diode D1; the other two ends of dual diode D1 are connected to capacitor C2, and one end of capacitor C2 outputs a voltage doubler signal that is connected to the signal driving circuit.

[0017] The signal driving circuit uses a low-bandwidth driving operational amplifier U1 to amplify the voltage multiplier signal output from the AC signal multiplier rectifier circuit, so that the boosted DC signal can reliably drive the subsequent load. Example

[0018] The DC voltage multiplier rectifier circuit in this embodiment differs from that in Embodiment 1 in that: further, the fifth terminal of the low-bandwidth drive operational amplifier U1 is connected to the power supply voltage VDD, and the second terminal is connected to the power supply VEE; the inverting input terminal of U1 is connected to the connection node of resistors R3 and R4; the other end of resistor R4 is grounded, and the other end of resistor R3 is connected to the output terminal SOUT of U1.

[0019] In the signal driving circuit, the non-inverting input terminal of the low-bandwidth driving operational amplifier U1 is connected to a bleed circuit resistor R2; the bleed circuit resistor R2 is connected in parallel with the capacitor C2 to slowly release the residual signal voltage on the capacitor C2 after the signal disappears or the power is cut off. Example

[0020] This invention provides an AC voltage doubler rectifier output circuit for sinusoidal signals, including resistors R1, R2, R3, and R4, capacitors C1 and C2, dual diodes D1, and a narrow-bandwidth operational amplifier U1.

[0021] An AC boost rectifier circuit, consisting of two capacitors and two diodes, utilizes the charge storage capacity of the filter capacitors to obtain a DC output voltage that is approximately twice the original AC signal. Its function is to convert the input AC signal voltage into a DC signal, which is then reliably used to drive the subsequent load via a signal drive circuit. The AC boost rectifier circuit and the signal drive circuit are connected in series.

[0022] For details, see Figure 1One end of resistor R1 is connected to the AC signal, and the other end of resistor R1 is connected to one end of capacitor C1. The other end of capacitor C1 is connected to the third terminal (common terminal) of dual diode D1. The second terminal of dual diode D1 is connected to one end of resistor R2, and the first terminal of dual diode D1 is connected to the other end of resistor R2. Capacitor C2 and resistor R2 are connected in parallel. The output voltage V2SIN of one set of nodes of capacitor C2 and resistor R2 is connected to the non-inverting input terminal of narrow bandwidth operational amplifier U1. The other set of nodes of capacitor C2 and resistor R2 are all grounded (the first terminal of D1, one end of R2, and one end of C2).

[0023] The fifth terminal of the driving operational amplifier U1 is connected to the power supply voltage VDD, and the second terminal is connected to the power supply VEE. The non-inverting input terminal of U1 is connected to the output terminal V2SIN of the AC multiplier rectifier circuit, and the inverting input terminal of U1 is connected to the second terminal of R4 and the first terminal of R3. The first terminal of R4 is grounded, and the second terminal of R3 is connected to the output terminal 4 of the operational amplifier U1. The fourth terminal of the operational amplifier U1 is the output terminal SOUT.

[0024] R1 is a damping or current-limiting adjustment resistor, C1 and C2 are AC multiplier capacitors, and the dual diode D1 is an AC rectifier diode. Since there is no current at the op-amp input terminal U1, a resistor R2 is set as the bleeder circuit resistor to slowly release the residual signal voltage on C2 after the signal disappears or the power is cut off. R3 is the feedback resistor, and R4 is the grounding resistor for the inverting input terminal. R3 and R4 form a feedback network. Adjusting the resistance values ​​of R3 and R4 can also adjust the amplification factor of the circuit, which is SOUT = (1 + R3 / R4) * V2SIN.

[0025] The dual diodes D1 can be BAV99 or seamlessly replaced by BAT54S in the same package. The low-bandwidth driver op-amp U1 can be such as LMV321, LM321, MS321, AS321KTR, SGM321, etc.

[0026] The working principle / process of the voltage multiplier rectifier output circuit of this utility model is as follows:

[0027] First stage: When the SIN signal is negative, diodes 1-3 of D1 conduct to charge capacitor C1, with C1 being negative on the left and positive on the right.

[0028] Second stage: When the SIN signal changes from a negative signal to a positive signal, diode 3-2 of D1 is turned on and diode D1-3 is turned off. At this time, the voltage on C1 and the forward voltage of the signal source both charge C2, that is, UC2=V2SIN=2*SIN (without considering the voltage drop on R1 and diode loss).

[0029] The third stage: When the SIN signal changes from a positive signal to a negative signal, diode D1-3 turns on, C1 continues to charge, diode D3-2 turns off, and the voltage on capacitor C2 remains unchanged, i.e., UC2=V2SIN=2*SIN. After several cycles, the charging is repeated, which makes the voltage at the V2SIN node gradually approach 2*SIN.

[0030] This circuit design has a simple structure, but the V2SIN voltage signal is already very high. The supply current provided by the small-signal voltage doubler rectifier circuit is very small, and its load-carrying capacity is very limited. Therefore, the driver circuit U1 is set as a non-inverting operational amplifier to better drive the subsequent load. This invention uses basic electrical components (diodes, resistors, capacitors) to obtain a DC signal output greater than the original signal source from the AC signal from the previous stage using voltage doubler rectification technology. It uses a low-cost, low-bandwidth operational amplifier to compensate for the phenomenon that the output signal will decrease or be lost when a load is applied to the circuit. It is economical, practical, and reliable.

[0031] Of course, the above description is only a preferred embodiment of this utility model and does not constitute a limitation on this utility model. Those skilled in the art, under the guidance of existing technology, can make other modifications to the implementation of this utility model without creative effort. Any modifications made within the spirit and principles of this utility model, or any simple substitutions or equivalent replacements made using conventional technical means in the field, should be included within the protection scope of this utility model.

Claims

1. A DC voltage multiplier rectifier circuit based on AC signals, characterized in that, include: AC signal multiplier rectifier circuit: It consists of two capacitors and two diodes. It uses the charging and discharging of the filter capacitor to store charge and convert the input AC signal voltage into a DC signal. The AC signal is connected to one end of capacitor C1 through damping / current limiting adjustment resistor R1, and the other end of capacitor C1 is connected to the common terminal of dual diode D1; the other two ends of dual diode D1 are connected to capacitor C2, and one end of capacitor C2 outputs a voltage doubler signal that is connected to the signal driving circuit. Signal driving circuit: Low-bandwidth drive amplifier U1 is used to amplify the voltage doubler signal output from the AC signal multiplier rectifier circuit so that the boosted DC signal can reliably drive the subsequent load.

2. The DC voltage multiplier rectifier circuit based on AC signals according to claim 1, characterized in that: The fifth terminal of the low-bandwidth drive operational amplifier U1 is connected to the power supply voltage VDD, and the second terminal is connected to the power supply VEE; the inverting input terminal of U1 is connected to the connection node of resistors R3 and R4; the other end of resistor R4 is grounded, and the other end of resistor R3 is connected to the output terminal SOUT of U1.

3. The DC voltage multiplier rectifier circuit based on AC signals according to claim 1 or 2, characterized in that: In the signal driving circuit, the non-inverting input terminal of the low-bandwidth driving operational amplifier U1 is connected to a bleed circuit resistor R2; the bleed circuit resistor R2 is connected in parallel with the capacitor C2 to slowly release the residual signal voltage on the capacitor C2 after the signal disappears or the power is cut off.

4. The DC voltage multiplier rectifier circuit based on AC signals according to claim 1 or 2, characterized in that: The capacitors C1 and C2 are AC multiplier capacitors; the dual diodes D1 are AC signal rectifier diodes, using BAV99 or BAT54S in the same package.

5. The DC voltage multiplier rectifier circuit based on AC signals according to claim 1 or 2, characterized in that: The low-bandwidth driver op amp U1 uses LMV321, LM321, MS321, AS321KTR or SGM321.

Images