Voltage-dividing energy storage circuit

Abstract

The utility model discloses a voltage-dividing energy storage circuit, which comprises a first voltage-dividing resistor, a second voltage-dividing resistor, a first energy storage capacitor, a second energy storage capacitor, a constant current unit, a first switch unit, a second switch unit and a microprocessor, the current input end of the constant current unit is electrically connected with a power supply, and the current output end of the constant current unit is electrically connected with the first switch unit; the first end of the first switch unit is electrically connected with the second end of the first divider resistor, and the second end of the first switch unit is electrically connected with the first end of the second energy storage capacitor; the electric energy input end of the second switch unit is electrically connected with the first end of the second energy storage capacitor, and the electric energy output end of a signal of the second switch unit is used for being electrically connected with target electric equipment; the microprocessor is electrically connected with the first switch unit and the second switch unit and used for controlling the second switch unit according to the trigger signal sent by the first switch unit. According to the utility model, the service life of the energy storage capacitor can be prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of energy storage circuits, in particular to a voltage-dividing energy storage circuit. Background Art

[0002] With the development of science and technology, energy storage power supplies have been widely used in various scenarios. For example, permanent magnet high and low voltage circuit breakers, contactors, etc. that have appeared in recent years require the use of high-voltage energy storage capacitors to drive the excitation coil of the permanent magnet switch to achieve switching action. At present, the energy storage capacitor is generally charged by a resistance step-down method. However, the existing technology is prone to overcharging when charging the energy storage capacitor, and overcharging the energy storage capacitor is likely to affect the service life of the energy storage capacitor, and in severe cases it will directly cause damage to the energy storage capacitor. Utility Model Content

[0003] The technical problem solved by the utility model is to provide a voltage-dividing energy storage circuit which can increase the service life of an energy storage capacitor.

[0004] The utility model provides a voltage-dividing energy storage circuit, which is used to supply power to a target electrical device, including a first voltage-dividing resistor, a second voltage-dividing resistor, a first energy storage capacitor, a second energy storage capacitor, a constant current unit, a first switch unit, a second switch unit and a microprocessor, wherein the first end of the first voltage-dividing resistor is used to be electrically connected to a power supply, the second end of the first voltage-dividing resistor is electrically connected to the first end of the second voltage-dividing resistor, and the second end of the second voltage-dividing resistor is grounded; the first end of the first energy storage capacitor is electrically connected to the first end of the first voltage-dividing resistor, the second end of the first energy storage capacitor is electrically connected to the first end of the second energy storage capacitor, and the second end of the second energy storage capacitor is grounded;

[0005] The current input end of the constant current unit is electrically connected to the power supply, and the current output end of the constant current unit is electrically connected to the first switch unit; the first end of the first switch unit is electrically connected to the second end of the first voltage-dividing resistor, and the second end of the first switch unit is electrically connected to the first end of the second energy storage capacitor; the power input end of the second switch unit is electrically connected to the first end of the second energy storage capacitor, and the signal power output end of the second switch unit is used to be electrically connected to the target electrical equipment; the microprocessor is electrically connected to the first switch unit and the second switch unit, and is used to control the second switch unit according to the trigger signal sent by the first switch unit.

[0006] Preferably, the constant current unit includes a first transistor and a second transistor, the base of the first transistor is electrically connected to the collector of the second transistor, the collector of the first transistor is electrically connected to the power supply, and the emitter of the first transistor is electrically connected to the first switch unit; the base of the second transistor is electrically connected to the emitter of the first transistor, the collector of the second transistor is electrically connected to the power supply, and the emitter of the second transistor is electrically connected to the first switch unit.

[0007] Preferably, the constant current unit also includes a first current limiting resistor, a first end of the first current limiting resistor is electrically connected to the power supply, a second end of the first current limiting resistor is electrically connected to the base of the first transistor and the collector of the second transistor, and the collector of the second transistor is electrically connected to the power supply through the first current limiting resistor.

[0008] Preferably, the constant current unit also includes a second current limiting resistor, the first end of the second current limiting resistor is electrically connected to the emitter of the first transistor and the base of the second transistor, the second end of the second current limiting resistor is electrically connected to the first switch unit, and the emitter of the first transistor is electrically connected to the first switch unit through the second current limiting resistor.

[0009] Preferably, the first switching unit includes a third transistor and a fourth transistor, the base of the third transistor is electrically connected to the second end of the first voltage-dividing resistor, the collector of the third transistor is electrically connected to the second end of the second current-limiting resistor and the collector of the second transistor, and the emitter of the third transistor is electrically connected to the collector of the fourth transistor; the base of the fourth transistor is electrically connected to the base of the third transistor, the collector of the fourth transistor is electrically connected to the first end of the second energy storage capacitor, and the emitter of the fourth transistor is electrically connected to the microprocessor.

[0010] Preferably, the first switching unit also includes a third current limiting resistor, a first end of the third current limiting resistor is electrically connected to the emitter of the fourth transistor, a second end of the third current limiting resistor is electrically connected to the microprocessor, and the emitter of the fourth transistor is electrically connected to the microprocessor through the third current limiting resistor.

[0011] Preferably, the second switching unit includes a first field effect transistor, a source of the first field effect transistor is electrically connected to the first end of the second energy storage capacitor, a gate of the first field effect transistor is electrically connected to the microprocessor, and a drain of the first field effect transistor is used to be electrically connected to the target electrical device.

[0012] Preferably, the second switching unit also includes a second field effect transistor, a source of the second field effect transistor is electrically connected to the source of the first field effect transistor, a drain of the second field effect transistor is electrically connected to the first end of the second energy storage capacitor, a gate of the second field effect transistor is electrically connected to the gate of the first field effect transistor, and a source of the first field effect transistor is electrically connected to the first end of the second energy storage capacitor through the second field effect transistor.

[0013] Preferably, the second switch unit further includes a fourth current limiting resistor, a first end of the fourth current limiting resistor is electrically connected to the source of the first field effect transistor, and a second end of the fourth current limiting resistor is electrically connected to the gate of the first field effect transistor.

[0014] Preferably, the second switch unit further includes a filter capacitor, a first end of the filter capacitor is electrically connected to the drain of the first field effect transistor, and a second end of the filter capacitor is grounded.

[0015] The utility model has the following beneficial effects: the utility model cooperates with the first voltage-dividing resistor, the second voltage-dividing resistor, the first energy storage capacitor, the second energy storage capacitor, the constant current unit, the first switch unit, the second switch unit and the microprocessor, the current input end of the constant current unit is electrically connected to the power supply, the current output end of the constant current unit is electrically connected to the first switch unit, the first end of the first switch unit is electrically connected to the second end of the first voltage-dividing resistor, the second end of the first switch unit is electrically connected to the first end of the second energy storage capacitor, the power input end of the second switch unit is electrically connected to the first end of the second energy storage capacitor, the power output end of the signal of the second switch unit is used to be electrically connected to the target electrical equipment, the microprocessor is electrically connected to the first switch unit and the second switch unit, and is used to control the second switch unit according to the trigger signal sent by the first switch unit. Therefore, during the charging process, the capacitor can be charged with a constant current, and when it is fully charged, the first switch unit triggers the microprocessor, so that the microprocessor controls the second switch unit to open and discharge, thereby improving the service life of the energy storage capacitor. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The utility model is a circuit diagram of a voltage-dividing energy storage circuit. DETAILED DESCRIPTION

[0017] The present invention is described in detail below in conjunction with the accompanying drawings and embodiments. It should be noted that, if there is no conflict, the embodiments of the present invention and the various features in the embodiments can be combined with each other, all within the protection scope of the present invention.

[0018] See also Figure 1The utility model provides a voltage-dividing energy storage circuit for supplying power to a target electrical device, which includes a first voltage-dividing resistor R1, a second voltage-dividing resistor R2, a first energy storage capacitor C1, a second energy storage capacitor C2, a constant current unit 1, a first switch unit 2, a second switch unit 3 and a microprocessor U. The first end of the first voltage-dividing resistor R1 is used to be electrically connected to a power source, the second end of the first voltage-dividing resistor R1 is electrically connected to the first end of the second voltage-dividing resistor R2, and the second end of the second voltage-dividing resistor R2 is grounded. The first end of the first energy storage capacitor C1 is electrically connected to the first end of the first voltage-dividing resistor R1, the second end of the first energy storage capacitor C1 is electrically connected to the first end of the second energy storage capacitor C2, and the second end of the second energy storage capacitor C2 is grounded.

[0019] The current input end of the constant current unit 1 is electrically connected to the power supply, and the current output end of the constant current unit 1 is electrically connected to the first switch unit 2. The first end of the first switch unit 2 is electrically connected to the second end of the first voltage-dividing resistor R1, and the second end of the first switch unit 2 is electrically connected to the first end of the second energy storage capacitor C2. The power input end of the second switch unit 3 is electrically connected to the first end of the second energy storage capacitor C2, and the power output end of the signal of the second switch unit 3 is used to be electrically connected to the target electrical device. The microprocessor U is electrically connected to the first switch unit 2 and the second switch unit 3, and is used to control the second switch unit 3 according to the trigger signal sent by the first switch unit 2.

[0020] The constant current unit 1 includes a first triode Q1 and a second triode Q2, the base of the first triode Q1 is electrically connected to the collector of the second triode Q2, the collector of the first triode Q1 is electrically connected to the power supply, and the emitter of the first triode Q1 is electrically connected to the first switch unit 2. The base of the second triode Q2 is electrically connected to the emitter of the first triode Q1, the collector of the second triode Q2 is electrically connected to the power supply, and the emitter of the second triode Q2 is electrically connected to the first switch unit 2.

[0021] The constant current unit 1 further includes a first current limiting resistor R3 and a second current limiting resistor R4, wherein a first end of the first current limiting resistor R3 is electrically connected to a power supply, a second end of the first current limiting resistor R3 is electrically connected to a base of the first triode Q1 and a collector of the second triode Q2, and a collector of the second triode Q2 is electrically connected to a power supply via the first current limiting resistor R3. A first end of the second current limiting resistor R4 is electrically connected to an emitter of the first triode Q1 and a base of the second triode Q2, a second end of the second current limiting resistor R4 is electrically connected to the first switch unit 2, and an emitter of the first triode Q1 is electrically connected to the first switch unit 2 via the second current limiting resistor R4.

[0022] The first current limiting resistor R3 is used to drive the first transistor Q1, so that the first transistor Q1 is turned on. When the voltage drop generated on the second current limiting resistor R4 increases to a voltage that reaches the voltage at which the second transistor Q2 is turned on, the second transistor Q2 is turned on, thereby realizing a current shunting effect. The currents of the first transistor Q1 and the second transistor Q2 increase and decrease, thereby realizing a constant current power supply, which has the advantages of simple and reliable structure.

[0023] The first switch unit 2 includes a third triode Q3 and a fourth triode Q4, the base of the third triode Q3 is electrically connected to the second end of the first voltage-dividing resistor R1, the collector of the third triode Q3 is electrically connected to the second end of the second current-limiting resistor R4 and the collector of the second triode Q2, the emitter of the third triode Q3 is electrically connected to the collector of the fourth triode Q4. The base of the fourth triode Q4 is electrically connected to the base of the third triode Q3, the collector of the fourth triode Q4 is electrically connected to the first end of the second energy storage capacitor C2, and the emitter of the fourth triode Q4 is electrically connected to the microprocessor U.

[0024] The first switch unit 2 further includes a third current limiting resistor R5, a first end of the third current limiting resistor R5 is electrically connected to the emitter of the fourth triode Q4, a second end of the third current limiting resistor R5 is electrically connected to the microprocessor U, and the emitter of the fourth triode Q4 is electrically connected to the microprocessor U through the third current limiting resistor R5. By providing the third current limiting resistor R5, the microprocessor U can be well protected. In the present embodiment, the microprocessor U is a single chip microcomputer, and of course, it can also be a field programmable logic array (FPGA).

[0025] The second switch unit 3 includes a first field effect transistor Q5, the source of which is electrically connected to the first end of the second energy storage capacitor C2, the gate of which is electrically connected to the microprocessor U, and the drain of which is used to be electrically connected to the target electrical device. The second switch unit 3 also includes a second field effect transistor Q6, the source of which is electrically connected to the source of the first field effect transistor Q5, the drain of which is electrically connected to the first end of the second energy storage capacitor C2, the gate of which is electrically connected to the gate of the first field effect transistor Q5, and the source of the first field effect transistor Q5 is electrically connected to the first end of the second energy storage capacitor C2 through the second field effect transistor Q6.

[0026] The second switch unit 3 further includes a fourth current limiting resistor R6, a first end of the fourth current limiting resistor R6 is electrically connected to the source of the first field effect transistor Q5, and a second end of the fourth current limiting resistor R6 is electrically connected to the gate of the first field effect transistor Q5. Under normal circumstances, the second energy storage capacitor C2 can increase a small voltage to the target electrical device through the first field effect transistor Q5 and the second field effect transistor Q6.

[0027] The second switch unit 3 also includes a filter capacitor C3, a first end of the filter capacitor C3 is electrically connected to the drain of the first field effect tube Q5, and a second end of the filter capacitor C3 is grounded. When the second energy storage capacitor C2 is fully charged and the voltage is greater than a preset value, the fourth transistor Q4 is turned on, thereby sending a trigger signal to the microprocessor U, and the microprocessor U controls the first field effect tube Q5 and the second field effect tube Q6 to turn on, so that the excess electric energy of the second energy storage capacitor C2 can be quickly released, thereby achieving the function of protecting the energy storage capacitor. Filtering is performed by the filter capacitor C3, thereby avoiding damage to the target electrical equipment.

[0028] In summary, the utility model cooperates with the first voltage-dividing resistor R1, the second voltage-dividing resistor R2, the first energy storage capacitor C1, the second energy storage capacitor C2, the constant current unit 1, the first switch unit 2, the second switch unit 3 and the microprocessor U, the current input end of the constant current unit 1 is electrically connected to the power supply, the current output end of the constant current unit 1 is electrically connected to the first switch unit 2, the first end of the first switch unit 2 is electrically connected to the second end of the first voltage-dividing resistor R1, the second end of the first switch unit 2 is electrically connected to the first end of the second energy storage capacitor C2, the power input end of the second switch unit 3 is electrically connected to the first end of the second energy storage capacitor C2, the power output end of the signal of the second switch unit 3 is used to be electrically connected to the target electrical equipment, and the microprocessor U is electrically connected to the first switch unit 2 and the second switch unit 3, and is used to control the second switch unit 3 according to the trigger signal sent by the first switch unit 2. Therefore, during the charging process, the capacitor can be charged with a constant current, and when fully charged, the first switch unit 2 triggers the microprocessor U, so that the microprocessor U controls the second switch unit 3 to open and discharge, thereby improving the service life of the energy storage capacitor.

[0029] The voltage divider energy storage circuit provided by the utility model is introduced in detail above. The principle and implementation mode of the utility model are explained in this article using specific examples. The description of the above embodiments is only used to help understand the method and core idea of ​​the utility model. At the same time, for those of ordinary skill in the art, according to the idea of ​​the utility model, there will be changes in the specific implementation mode and application scope. In summary, the content of this specification is only an implementation mode of the utility model, and does not limit the patent scope of the utility model. All equivalent structures or equivalent process changes made by using the contents of the specification and drawings of the utility model, or directly or indirectly used in other related technical fields, are similarly included in the patent protection scope of the utility model and should not be understood as limitations on the utility model.

Claims

1. A voltage-dividing energy storage circuit for supplying power to a target electrical device, characterized in that: It includes a first voltage-dividing resistor, a second voltage-dividing resistor, a first energy storage capacitor, a second energy storage capacitor, a constant current unit, a first switch unit, a second switch unit and a microprocessor, wherein the first end of the first voltage-dividing resistor is used to be electrically connected to a power supply, the second end of the first voltage-dividing resistor is electrically connected to the first end of the second voltage-dividing resistor, and the second end of the second voltage-dividing resistor is grounded; the first end of the first energy storage capacitor is electrically connected to the first end of the first voltage-dividing resistor, the second end of the first energy storage capacitor is electrically connected to the first end of the second energy storage capacitor, and the second end of the second energy storage capacitor is grounded; The current input end of the constant current unit is electrically connected to the power supply, and the current output end of the constant current unit is electrically connected to the first switch unit; the first end of the first switch unit is electrically connected to the second end of the first voltage-dividing resistor, and the second end of the first switch unit is electrically connected to the first end of the second energy storage capacitor; the power input end of the second switch unit is electrically connected to the first end of the second energy storage capacitor, and the signal power output end of the second switch unit is used to be electrically connected to the target electrical equipment; the microprocessor is electrically connected to the first switch unit and the second switch unit, and is used to control the second switch unit according to the trigger signal sent by the first switch unit.

2. The voltage-dividing energy storage circuit according to claim 1, characterized in that: The constant current unit includes a first transistor and a second transistor, the base of the first transistor is electrically connected to the collector of the second transistor, the collector of the first transistor is electrically connected to the power supply, and the emitter of the first transistor is electrically connected to the first switch unit; the base of the second transistor is electrically connected to the emitter of the first transistor, the collector of the second transistor is electrically connected to the power supply, and the emitter of the second transistor is electrically connected to the first switch unit.

3. The voltage-dividing energy storage circuit according to claim 2, characterized in that: The constant current unit also includes a first current limiting resistor, a first end of the first current limiting resistor is electrically connected to the power supply, a second end of the first current limiting resistor is electrically connected to the base of the first transistor and the collector of the second transistor, and the collector of the second transistor is electrically connected to the power supply through the first current limiting resistor.

4. The voltage-dividing energy storage circuit according to claim 2, characterized in that: The constant current unit also includes a second current limiting resistor, a first end of the second current limiting resistor is electrically connected to the emitter of the first transistor and the base of the second transistor, a second end of the second current limiting resistor is electrically connected to the first switch unit, and the emitter of the first transistor is electrically connected to the first switch unit through the second current limiting resistor.

5. The voltage-dividing energy storage circuit according to claim 4, characterized in that: The first switching unit includes a third transistor and a fourth transistor, the base of the third transistor is electrically connected to the second end of the first voltage-dividing resistor, the collector of the third transistor is electrically connected to the second end of the second current-limiting resistor and the collector of the second transistor, and the emitter of the third transistor is electrically connected to the collector of the fourth transistor; the base of the fourth transistor is electrically connected to the base of the third transistor, the collector of the fourth transistor is electrically connected to the first end of the second energy storage capacitor, and the emitter of the fourth transistor is electrically connected to the microprocessor.

6. The voltage-dividing energy storage circuit according to claim 5, characterized in that: The first switching unit also includes a third current limiting resistor, a first end of the third current limiting resistor is electrically connected to the emitter of the fourth transistor, a second end of the third current limiting resistor is electrically connected to the microprocessor, and the emitter of the fourth transistor is electrically connected to the microprocessor through the third current limiting resistor.

7. The voltage-dividing energy storage circuit according to claim 1, characterized in that: The second switch unit includes a first field effect transistor, a source of the first field effect transistor is electrically connected to the first end of the second energy storage capacitor, a gate of the first field effect transistor is electrically connected to the microprocessor, and a drain of the first field effect transistor is used to be electrically connected to the target electrical device.

8. The voltage-dividing energy storage circuit according to claim 7, characterized in that: The second switch unit also includes a second field effect transistor, a source of the second field effect transistor is electrically connected to the source of the first field effect transistor, a drain of the second field effect transistor is electrically connected to the first end of the second energy storage capacitor, a gate of the second field effect transistor is electrically connected to the gate of the first field effect transistor, and a source of the first field effect transistor is electrically connected to the first end of the second energy storage capacitor through the second field effect transistor.

9. The voltage-dividing energy storage circuit according to claim 8, characterized in that: The second switch unit further includes a fourth current limiting resistor, a first end of the fourth current limiting resistor is electrically connected to the source of the first field effect transistor, and a second end of the fourth current limiting resistor is electrically connected to the gate of the first field effect transistor.

10. The voltage-dividing energy storage circuit according to claim 8, characterized in that: The second switch unit further includes a filter capacitor, a first end of the filter capacitor is electrically connected to the drain of the first field effect transistor, and a second end of the filter capacitor is grounded.

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