CN211509035U

CN211509035U - Voltage doubling circuit

Info

Publication number: CN211509035U
Application number: CN202020224992.7U
Authority: CN
Inventors: 彭照辉; 颜淼鑫; 江仪慧; 高金强
Original assignee: Ningbo Sanxing Electric Co Ltd
Current assignee: Ningbo Sanxing Electric Co Ltd
Priority date: 2020-02-28
Filing date: 2020-02-28
Publication date: 2020-09-15
Anticipated expiration: 2030-02-28

Abstract

The utility model relates to a voltage doubling circuit, its characterized in that: the circuit comprises a first power supply VAA, a second power supply VBB, a first backflow prevention module, a second backflow prevention module, a voltage stabilizing module, a voltage regulating module and a control module; the first power supply VAA is connected with one end of the voltage regulating module through the first backflow prevention module so as to apply the voltage of the first power supply VAA to the voltage regulating module; the second power supply VBB is connected with the other end of the voltage regulating module so that the voltage of the second power supply VBB can be applied to the voltage regulating module, the input end of the second backflow prevention module is connected with one end of the voltage regulating module, and the output end of the second backflow prevention module is connected with the voltage stabilizing module; the control module is connected between the second power supply VBB and the voltage regulating module, and the control end of the control module is connected with the PWM signal, so that the voltage of the end of the voltage regulating module changes along with the duty ratio change of the PWM signal. The voltage doubling circuit is simple in structure and beneficial to cost saving.

Description

Voltage doubling circuit

Technical Field

The utility model relates to an electric energy meter technical field especially relates to a voltage doubling circuit.

Background

With the popularization of intelligent electric energy meters, the demand of overseas markets is also increasing, and in order to meet the demands of different countries and regions, under a common condition, one electric energy meter needs to integrate multiple functions such as communication, display, metering, alarming, control and the like.

Because the operating voltage scope of the different functional modules of electric energy meter is different, the consumption requires differently, simultaneously in order to user's protection, still need set up strong and weak galvanic isolation, this will lead to the inside power design of electric energy meter complicated various, the power scheme of present electric energy meter usually does, obtain the required voltage through ACDC rectification earlier after obtaining the low voltage power, then adopt DCDC, LDO etc. and this will lead to the PCB board of electric energy meter to arrange the degree of difficulty big, be unfavorable for the whole cost control of electric energy meter.

SUMMERY OF THE UTILITY MODEL

In view of the above, an object of the present invention is to provide a voltage doubling circuit which is convenient for the layout of the electric energy meter PCB and is beneficial to saving the overall cost.

In order to realize the purpose, the technical scheme of the utility model is that: a voltage doubling circuit, characterized by: the circuit comprises a first circuit and a second circuit,

the device comprises a first power supply VAA, a second power supply VBB, a first backflow prevention module, a second backflow prevention module, a voltage stabilizing module, a voltage regulating module and a control module;

the first power supply VAA is connected with one end of the voltage regulating module through the first backflow prevention module so as to apply the voltage of the first power supply VAA to the voltage regulating module;

the second power supply VBB is connected with the other end of the voltage regulating module so that the voltage of the second power supply VBB can be applied to the voltage regulating module, the input end of the second backflow prevention module is connected with one end of the voltage regulating module, and the output end of the second backflow prevention module is connected with the voltage stabilizing module;

the control module is connected between the second power supply VBB and the voltage regulating module, and the control end of the control module is connected with the PWM signal, so that the voltage of the end of the voltage regulating module changes along with the duty ratio change of the PWM signal.

Further, the voltage regulating module includes a first capacitor C1, one end of the first capacitor C1 is connected between the first anti-backflow module and the second anti-backflow module, and the other end is connected to the second power VBB.

Furthermore, the control module comprises a triode, the triode is connected between the second power supply VBB and the ground, and the base of the triode is connected with the PWM signal.

Further, the triode is an NPN type triode V1, and a collector of the NPN type triode V1 is connected to the second power VBB, and an emitter thereof is grounded.

Further, the first backflow prevention module comprises a first diode VD1, an anode of the first diode VD1 is connected to the first power supply VAA, and a cathode of the first diode VD1 is connected to the one end of the first capacitor C1.

Further, the second backflow prevention module comprises a second diode VD2, an anode of the second diode VD2 is connected with a cathode of the first diode VD1, and a cathode of the second diode VD2 is connected with the voltage stabilization module.

Further, the voltage stabilizing module comprises a voltage stabilizing diode VD3, and the anode of the voltage stabilizing diode VD3 is grounded while the cathode is connected with the cathode of the second diode VD 2.

Further, a second capacitor C2 is connected in parallel across the zener diode VD 3.

Further, the circuit further comprises a first resistor R1, and the negative electrode of the second diode VD2 is connected with the negative electrode of the voltage stabilizing diode VD3 through a first resistor R1.

Further, the circuit further includes a second resistor R2, and the second power source VBB is connected to the other end of the first capacitor C1 through a second resistor R2.

Compared with the prior art, the utility model has the advantages of:

this scheme is through setting up first electric capacity C1 and utilizing the characteristic that the voltage of first electric capacity C1 both ends can not break suddenly, can add the voltage of first power VAA and second power VBB on first electric capacity C1, the base of triode inserts the PWM signal and can make the periodic ground connection of second power VBB and add on first electric capacity C1, through the duty cycle of adjusting the PWM signal, can make the output voltage of voltage doubling circuit adjust between first power VAA voltage, first power VAA and second power VBB voltage sum, thereby obtain required voltage, this circuit structure is simple, it is convenient to adjust, be convenient for the PCB circuit layout of electric energy meter, be favorable to practicing thrift the cost.

Drawings

Fig. 1 is a circuit diagram of an embodiment of the present application.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.

As shown in fig. 1, a circuit diagram of an embodiment of the present application includes a first power supply VAA, a second power supply VBB, a first backflow prevention module 1, a second backflow prevention module 2, a voltage stabilization module 3, a voltage regulation module 4, and a control module 5; the first power supply VAA is connected with one end of the voltage regulating module 4 through the first backflow prevention module 1 so as to apply the voltage of the first power supply VAA to the voltage regulating module 4, the second power supply VBB is connected with the other end of the voltage regulating module 4 so as to apply the voltage of the second power supply VBB to the voltage regulating module 4, the input end of the second backflow prevention module 2 is connected with one end of the voltage regulating module 4, and the output end of the second backflow prevention module is connected with the voltage stabilizing module 3; the control module 5 is connected between the second power VBB and the voltage regulating module 4, and a control end of the control module 5 is connected to the PWM signal, so that a voltage at one end of the voltage regulating module 4 changes along with a duty ratio change of the PWM signal.

Specifically, the voltage regulating module 4 includes a first capacitor C1, one end of the first capacitor C1 is connected between the first anti-backflow module 1 and the second anti-backflow module 2, and the other end is connected to the second power VBB.

The control module 5 includes a transistor connected between the second power VBB and ground, and a base of the transistor inputs a PWM signal, in this embodiment, the triode is an NPN type triode V1, the collector electrode of the NPN type triode V1 is connected with the second power supply VBB, the emitter electrode is grounded, when the PWM signal is high, the NPN transistor V1 is turned on, the second power VBB is equivalent to ground, and the first capacitor C1 is charged by the first power VAA, when the PWM signal is low, the NPN transistor V1 is turned off, and the second power VBB is added to the circuit, due to the non-abrupt change of the voltage across the capacitor, the voltage at the left end of the first capacitor C1 will be raised to VBB, and the voltage at the right end of the first capacitor C1 will also be raised to VBB, that is, the voltage at the right end of the first capacitor C1 is raised to VAA + VBB, so that the rear-end output voltage V-OUT is VAA + VBB, thereby achieving the purpose of voltage doubling.

In this embodiment, the first backflow prevention module 1 includes a first diode VD1, an anode of the first diode VD1 is connected to the first power supply VAA, and a cathode of the first diode VD1 is connected to one end of the first capacitor C1; the second backflow prevention module 2 comprises a second diode VD2, the anode of the second diode VD2 is connected with the cathode of the first diode VD1, and the cathode is connected with the voltage stabilization module 3. Through the arrangement of the backflow prevention module, current backflow can be prevented to damage the first power supply VAA and the second power supply VBB.

In order to stabilize and reliable the output voltage of the voltage doubling circuit, the voltage doubling circuit further includes a voltage stabilizing diode VD3, the anode of the voltage stabilizing diode VD3 is grounded, and the cathode is connected to the cathode of the second diode VD2, and the voltage stabilizing module 3 is the voltage stabilizing diode VD 3.

In order to improve the output capability of the voltage-multiplying circuit, the two ends of the voltage-stabilizing diode VD3 are also connected in parallel with a second capacitor C2, when the circuit is powered on and charges the second capacitor C2, and the second capacitor C2 supplies power to the outside when the circuit needs to be used as a power supply to supply power to the outside, thereby improving the practicability of the circuit.

In order to ensure the safe and stable operation of the voltage doubling circuit and prevent the circuit current from being overlarge, the voltage doubling circuit further comprises a first resistor R1 and a second resistor R2, and the first resistor R1 is connected between the cathode of the second diode VD2 and the cathode of the voltage stabilizing diode VD 3; the second resistor R2 is connected between the second power source VBB and the left end of the first capacitor C1, and the collector of the NPN transistor V1 is connected between the second resistor R2 and the first capacitor C1.

The working principle of the voltage doubling circuit is as follows:

when the PWM signal is at a high level, V1 is turned on, the second power VBB is equivalent to ground, at this time, one end of the left side of the first capacitor C1 is equivalent to ground, the voltage is zero, one end of the right side of C1 is connected to the first power VAA, the voltage is VAA, and at this time, the output V-OUT of the voltage doubling circuit is VAA; when the PWM signal changes to a low level, V1 is turned off, VBB is added to the circuit, based on the characteristic that the voltage at the two ends of C1 does not suddenly change, at this time, the voltage at the left end of the first capacitor C1 is VBB, and the voltage at the right end of C1 is VAA + VBB, that is, the output V-OUT of the voltage doubling circuit is VAA + VBB, since the voltage at the right end of C1 changes toward the stable state of the first power supply VAA, C1 discharges to reduce the voltage at the right end, the adjustment of the output voltage V-OUT of the voltage doubling circuit between VAA and VAA + VBB can be realized by adjusting the duty ratio of the PWM signal, and the required voltage can be obtained by the voltage stabilizing function of the voltage stabilizing diode VD 3.

While embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A voltage doubling circuit, characterized by: the circuit comprises a first circuit and a second circuit,

the device comprises a first power supply VAA, a second power supply VBB, a first backflow prevention module (1), a second backflow prevention module (2), a voltage stabilizing module (3), a voltage regulating module (4) and a control module (5);

the first power supply VAA is connected with one end of the voltage regulating module (4) through the first backflow prevention module (1) so as to apply the voltage of the first power supply VAA to the voltage regulating module (4);

the second power supply VBB is connected with the other end of the voltage regulating module (4) so that the voltage of the second power supply VBB can be applied to the voltage regulating module (4), the input end of the second backflow prevention module (2) is connected with one end of the voltage regulating module (4), and the output end of the second backflow prevention module is connected with the voltage stabilizing module (3);

the control module (5) is connected between the second power supply VBB and the voltage regulating module (4), and the control end of the control module (5) is connected with the PWM signal, so that the voltage of the end of the voltage regulating module (4) changes along with the duty ratio change of the PWM signal.

2. The voltage doubling circuit of claim 1, wherein:

the voltage regulating module (4) comprises a first capacitor C1, one end of the first capacitor C1 is connected between the first backflow prevention module (1) and the second backflow prevention module (2), and the other end of the first capacitor C1 is connected with the second power supply VBB.

3. The voltage doubling circuit of claim 2, wherein:

the control module (5) comprises a triode, the triode is connected between the second power supply VBB and the ground, and the base electrode of the triode is connected with the PWM signal.

4. The voltage doubling circuit of claim 3, wherein:

the triode is an NPN type triode V1, the collector of the NPN type triode V1 is connected with the second power supply VBB, and the emitter of the NPN type triode V1 is grounded.

5. The voltage doubling circuit of claim 2, wherein:

the first backflow prevention module (1) comprises a first diode VD1, wherein the anode of the first diode VD1 is connected with a first power supply VAA, and the cathode of the first diode VD1 is connected with one end of a first capacitor C1.

6. The voltage doubling circuit of claim 5, wherein:

the second backflow prevention module (2) comprises a second diode VD2, the anode of the second diode VD2 is connected with the cathode of the first diode VD1, and the cathode of the second diode VD2 is connected with the voltage stabilization module (3).

7. The voltage doubling circuit of claim 6, wherein:

the voltage stabilizing module (3) comprises a voltage stabilizing diode VD3, wherein the anode of the voltage stabilizing diode VD3 is grounded, and the cathode of the voltage stabilizing diode VD is connected with the cathode of a second diode VD 2.

8. The voltage doubling circuit of claim 7, wherein:

and a second capacitor C2 is connected in parallel with two ends of the voltage stabilizing diode VD 3.

9. The voltage doubling circuit of claim 7, wherein:

the circuit further comprises a first resistor R1, and the negative electrode of the second diode VD2 is connected with the negative electrode of the voltage stabilizing diode VD3 through a first resistor R1.

10. The voltage doubling circuit of claim 2, wherein:

the circuit further comprises a second resistor R2, and the second power supply VBB is connected with the other end of the first capacitor C1 through a second resistor R2.