Control power supply delay circuit

Abstract

The utility model relates to a control power supply time-delay circuit, which is applied to the technical field of power supply of a power supply, and is characterized in that a rectifier bridge circuit is connected in parallel on the basis of an existing energy storage capacitor circuit, and through parallel shunt, when a power supply charges an energy storage capacitor, the flowing current is small, and the power loss of a current-limiting resistor in the energy storage capacitor circuit is small; after energy charging of the energy storage capacitor is completed, power is supplied to the control system through the rectifier bridge circuit, the power loss of the rectifier bridge is far smaller than the loss of the current limiting resistor, and therefore the problem that in the prior art, the power loss of the energy storage capacitor circuit is large is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of power supply, in particular to a power supply delay control circuit. Background Art

[0002] The control power supply and power supply in industrial control equipment share a power supply. When the power grid suddenly changes or the power is cut off, the control power supply will also lose power. If the control power supply is lost, the safety logic will not have time to respond, which will cause failures or impacts. In order to ensure the safety and reliability of the logic after a power outage, UPS or large energy storage capacitors are added to the front stage of the control power supply to delay the power off of the control power supply.

[0003] UPS can choose different capacity sizes according to different power supply durations, but ordinary UPS uses lead-acid batteries for internal power supply. The life of lead-acid batteries is generally not long. They will fail after three to five years and need to be replaced, which is expensive.

[0004] Energy storage capacitors, with different capacity capacitors according to demand, this solution is considered to save volume cost and the capacitor life is longer than that of lead-acid batteries;

[0005] However, the existing energy storage capacitor circuit is a series circuit, which includes a current limiting resistor. When charging the capacitor, or when powering the control system through the circuit after the capacitor is charged, the current limiting resistor will always be passed through, and the resistor will continue to heat up, resulting in power loss. Utility Model Content

[0006] In view of this, the purpose of the utility model is to provide a control power delay circuit to solve the problem in the prior art that the energy storage capacitor circuit includes a current limiting resistor. During the process of charging the capacitor, or when the control system is powered by the circuit after the capacitor is charged, the current will always pass through the current limiting resistor, and the resistor will continue to heat up, resulting in power loss.

[0007] The utility model provides a control power delay circuit, the circuit comprising:

[0008] A power supply, a second rectifier bridge circuit and an energy storage capacitor circuit;

[0009] The output end of the power supply is respectively connected to the input end of the energy storage capacitor circuit and the input end of the second rectifier bridge circuit, the energy storage capacitor circuit and the second rectifier bridge circuit are connected in parallel, and the output ends of the energy storage capacitor circuit and the second rectifier bridge circuit are respectively connected to the control system;

[0010] The second rectifier bridge circuit is used to supply power to the control system during the charging process of the energy storage capacitor circuit and when the charging is completed, and the energy storage capacitor circuit is used to supply power to the control system when the power supply is cut off.

[0011] Preferably,

[0012] The energy storage capacitor circuit includes a fuse F1, a first rectifier bridge circuit, a current limiting resistor and an energy storage capacitor;

[0013] The input end of the fuse F1 is connected to the phase line of the power supply, the output end of the fuse F1 is connected to the first input end of the first rectifier bridge circuit, the neutral line of the power supply is connected to the second input end of the first rectifier bridge circuit, the first output end of the first rectifier bridge circuit is connected to the input end of the current limiting resistor, the output end of the current limiting resistor is connected to the input end of the control system, and the second output end of the first rectifier bridge circuit is connected to the input end of the control system, so that the power supply, the first rectifier bridge circuit, the current limiting resistor and the control system form a loop;

[0014] One end of the energy storage capacitor is connected to the line connecting the current limiting resistor and the control system, and the other end of the energy storage capacitor is connected to the line connecting the first rectifier bridge circuit and the control system.

[0015] Preferably,

[0016] The energy storage capacitor circuit also includes a third rectifier bridge circuit, the output end of the current limiting resistor is connected to the first input end of the third rectifier bridge circuit, the second output end of the first rectifier bridge circuit is connected to the second input end of the third rectifier bridge circuit, and the first output end and the second output end of the third rectifier bridge circuit are respectively connected to the control system;

[0017] One end of the energy storage capacitor is connected to the line connecting the current limiting resistor and the third rectifier bridge, and the other end of the energy storage capacitor is connected to the line connecting the first rectifier bridge circuit and the third rectifier bridge.

[0018] Preferably,

[0019] The energy storage capacitor includes multiple energy storage capacitors, and the multiple energy storage capacitors are connected in parallel.

[0020] Preferably,

[0021] The current limiting resistor includes two current limiting resistors, which are connected in parallel.

[0022] Preferably,

[0023] The two current limiting resistors are both 8W resistors with a resistance of 250Ω.

[0024] Preferably,

[0025] The fuse F1 is a fuse with a rated voltage of 250V and a rated current of 10A.

[0026] Preferably,

[0027] The first rectifier bridge circuit, the second rectifier bridge circuit and the third rectifier bridge circuit all use a rectifier bridge with a rated forward current of 10A and a rated reverse voltage of 600V, which is composed of 4 rectifier diodes connected in the form of a bridge full-wave rectifier circuit and packaged as an integrated whole.

[0028] The technical solution provided by the embodiment of the utility model may include the following beneficial effects:

[0029] The present application connects a rectifier bridge circuit in parallel with the existing energy storage capacitor circuit. Through parallel current diversion, when the power supply is charging the energy storage capacitor, the current flowing through is small, and the power loss of the current limiting resistor in the energy storage capacitor circuit is small. When the energy storage capacitor is fully charged, the control system is powered by the rectifier bridge circuit, and the power loss of the rectifier bridge is much smaller than the loss of the current limiting resistor. Therefore, the solution of the present application solves the problem of large power loss of the energy storage capacitor circuit in the prior art.

[0030] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The accompanying drawings herein are incorporated in and constitute a part of the specification, illustrate embodiments consistent with the present utility model, and together with the description, are used to explain the principles of the present utility model.

[0032] Figure 1 is a system schematic diagram of a control power delay circuit according to an exemplary embodiment;

[0033] Figure 2 is a schematic diagram of a UPS system in the prior art according to another exemplary embodiment;

[0034] Figure 3 is a system schematic diagram of a circuit for adding energy storage capacitors in the prior art according to another exemplary embodiment;

[0035] Figure 4 is a circuit principle schematic diagram of an energy storage capacitor circuit in the prior art according to another exemplary embodiment;

[0036] Figure 5 is a circuit principle schematic diagram of the energy storage capacitor circuit in the present application according to another exemplary embodiment;

[0037] In the attached drawings: 1-power supply, 2-second rectifier bridge circuit, 3-energy storage capacitor circuit, 4-third rectifier bridge circuit, 5-control system. DETAILED DESCRIPTION

[0038] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Instead, they are merely examples of devices and methods consistent with some aspects of the present invention as detailed in the appended claims.

[0039] Embodiment 1

[0040] Figure 1 1 is a system schematic diagram of a control power delay circuit according to an exemplary embodiment, the circuit comprising:

[0041] Power supply 1, second rectifier bridge circuit 2 and energy storage capacitor circuit 3;

[0042] The output end of the power supply 1 is respectively connected to the input end of the energy storage capacitor circuit 3 and the input end of the second rectifier bridge circuit 2, the energy storage capacitor circuit 3 and the second rectifier bridge circuit 2 are connected in parallel, and the output ends of the energy storage capacitor circuit 3 and the second rectifier bridge circuit 2 are respectively connected to the control system 5;

[0043] The second rectifier bridge circuit 2 is used to supply power to the control system 5 during the charging process of the energy storage capacitor circuit 3 and when the charging is completed, and the energy storage capacitor circuit 3 is used to supply power to the control system 5 when the power supply 1 is powered off;

[0044] It is understandable that in the prior art, UPS or energy storage capacitor circuits are usually used to prevent the control power supply from losing power when the power grid suddenly changes or the power is cut off. If the control power supply is lost, the safety logic will not be able to respond in time, which will cause failures or impacts, such as the following. Figure 2 And attached Figure 3As shown, the energy density of the battery used in UPS is much higher under the same volume, and the power supply is generally more than half an hour; the energy storage capacitor is enough to keep the control power supply charged and respond to the logic within a certain period of time when the main equipment is powered off, generally within 5 minutes; UPS can choose different power supply durations and capacities according to needs, but the internal power supply of ordinary UPS is powered by lead-acid batteries, which generally have a short lifespan and will fail after three to five years and need to be replaced; and energy storage capacitors are configured with different capacity capacitors according to needs. This solution is considered to save volume costs and the capacitor life is longer than that of lead-acid batteries. Therefore, the present application makes improvements on the basis of the existing energy storage capacitor, by connecting the second rectifier bridge circuit 2 in parallel on the basis of the existing energy storage capacitor circuit, and through parallel shunting, when the power supply 1 is charging the energy storage capacitor circuit 3, the current flowing through is small, and the power loss of the current limiting resistor in the energy storage capacitor circuit 3 is small. When the energy storage capacitor is charged, the control system 5 is powered by the second rectifier bridge circuit 2, and the power loss of the second rectifier bridge circuit 2 is much smaller than the loss of the current limiting resistor in the energy storage capacitor circuit 3. Therefore, the solution of the present application solves the problem of large power loss of the energy storage capacitor circuit in the prior art.

[0045] Preferably,

[0046] The energy storage capacitor circuit 3 includes a fuse F1, a first rectifier bridge circuit, a current limiting resistor and an energy storage capacitor;

[0047] The input end of the fuse F1 is connected to the phase line of the power supply, the output end of the fuse F1 is connected to the first input end of the first rectifier bridge circuit, the neutral line of the power supply is connected to the second input end of the first rectifier bridge circuit, the first output end of the first rectifier bridge circuit is connected to the input end of the current limiting resistor, the output end of the current limiting resistor is connected to the input end of the control system, and the second output end of the first rectifier bridge circuit is connected to the input end of the control system, so that the power supply, the first rectifier bridge circuit, the current limiting resistor and the control system form a loop;

[0048] One end of the energy storage capacitor is connected to the line connecting the current limiting resistor and the control system, and the other end of the energy storage capacitor is connected to the line connecting the first rectifier bridge circuit and the control system;

[0049] It is understandable that if Figure 4 or attached Figure 5As shown, in the existing energy storage capacitor circuit 3, the phase line and the neutral line input of the power supply 1 pass through the F1 fuse, the first rectifier bridge D1, the current limiting resistor R1 to the energy storage capacitor C1-C10. After the front-end power supply 1 loses power, the power of 10 400V / 820uF capacitors supports the power supply of the control system 5. However, it can be clearly seen that with the solution of the prior art, because the load current always flows through the current limiting resistor R1, according to the formula P=UI, the current limiting resistor must have a small resistance value, otherwise the current flowing through the load will cause it to produce a large voltage drop, which will cause the load voltage to drop; a small resistance The high current charging when power is turned on may cause damage to the first rectifier bridge. Even if the resistance of the current limiting resistor R1 selected in the prior art is 20 ohms, the charging current of the current limiting resistor R1 can still reach 220V / 20Ω=11A. After the energy storage capacitor is charged, the power supply 1 still needs to supply power to the control system 5 through the energy storage capacitor circuit 3. Therefore, although the voltage drop of the current limiting resistor R1 reaches 10V when the current is 0.5A after charging, and the power consumption is 5W, it needs to continue to generate heat.

[0050] Preferably,

[0051] The energy storage capacitor circuit 3 also includes a third rectifier bridge circuit 4, the output end of the current limiting resistor is connected to the first input end of the third rectifier bridge circuit 4, the second output end of the first rectifier bridge circuit is connected to the second input end of the third rectifier bridge circuit 4, and the first output end and the second output end of the third rectifier bridge circuit 4 are respectively connected to the control system 5;

[0052] One end of the energy storage capacitor is connected to the line connecting the current limiting resistor and the third rectifier bridge 4, and the other end of the energy storage capacitor is connected to the line connecting the first rectifier bridge circuit and the third rectifier bridge 4;

[0053] It is understandable that if Figure 5As shown, since the present application connects a second rectifier bridge circuit 2 in parallel on the basis of the original energy storage capacitor circuit 3, when charging the energy storage capacitor, since the second rectifier bridge circuit 2 shunts the current of the power supply 1, the current flowing through the current limiting resistor is small, and its heat loss is reduced. When the energy storage capacitor is charged, the power supply of the control system 5 is completed by the second rectifier bridge circuit 2, that is, the first rectifier bridge D1 and the current limiting resistor are only responsible for working when the capacitor is powered on. After charging is completed, the current limiting resistor has no power loss, and the loss of the second rectifier bridge circuit 2 is much smaller than the loss of the current limiting resistor. At the same time, since the present application adds the second rectifier bridge circuit 2, when the power supply 1 is started, there is a situation where the current directly flows back through the second rectifier bridge circuit 2 to charge the energy storage capacitor. In this case, the second rectifier bridge circuit 2 may be damaged due to excessive instantaneous current. Therefore, the present application also adds a third rectifier bridge circuit 4 at the end of the original energy storage capacitor circuit 3, the purpose of which is to prevent the voltage at the rear end of the second rectifier bridge from flowing back into the capacitor.

[0054] Preferably,

[0055] The energy storage capacitor includes multiple energy storage capacitors, and the multiple energy storage capacitors are connected in parallel.

[0056] Preferably,

[0057] The current limiting resistor comprises two, and the two current limiting resistors are connected in parallel;

[0058] Preferably,

[0059] The two current limiting resistors are both 8W and 250Ω resistors;

[0060] It is understandable that if Figure 5 As shown, the present application has also made improvements on the basis of an existing 20 ohm, 80W current limiting resistor, and has become two parallel 8W resistors with a resistance of 250Ω as the current limiting resistor. Because the load current in the present application will not always flow through the current limiting resistor, the resistance of the current limiting resistor can be increased. A larger resistance can avoid excessive current when charging the energy storage capacitor, thereby ensuring the safety of the first rectifier bridge D1. At the same time, in the present application, when the power supply 1 is powered off, the capacitor is used to supply power to the control system 5 through the third rectifier bridge D3; and the energy storage capacitor in the present application is electrically connected to the control system 5. During the charging process of circuit 3, the charging current of the current limiting resistors R1 and R2 is 220V / 125Ω=1.76A; when charging is completed, the load current does not pass through the current limiting resistors R1 and R2 when it is 0.5A, but the control system is powered by the second rectifier bridge circuit 2 in parallel. Therefore, after charging, the current of the current limiting resistors R1 and R2 is 0, and the resistors do not heat up; when charging is completed, when the control system 5 is powered by the second rectifier bridge circuit 2, the power consumption of the second rectifier bridge circuit 2 is 0.7V (diode voltage drop)*2 (2 diodes are connected in series)

[0061] *0.5A=0.7W; At the same time, although two rectifier bridges (D2 and D3) and a current limiting resistor are added in the present application compared to the existing energy storage content circuit, the prior art must use a high-power resistor (80W, 20Ω) due to the power consumption of the charging resistor, and its cost is the same as the two added rectifier bridges plus two (8W250Ω), that is, although the present application adds components, it does not increase the cost.

[0062] Preferably,

[0063] The fuse F1 is a fuse with a rated voltage of 250V and a rated current of 10A.

[0064] Preferably,

[0065] The first rectifier bridge circuit, the second rectifier bridge circuit and the third rectifier bridge circuit all adopt a rectifier bridge with a rated forward current of 10A and a rated reverse voltage of 600V, which is composed of four rectifier diodes connected in the form of a bridge full-wave rectifier circuit and packaged as one;

[0066] It can be understood that rectifier bridge stacks are generally used in full-wave rectifier circuits, which are divided into full-bridge and half-bridge. The full-bridge is the four diodes of the connected bridge rectifier circuit sealed together, which is not easy to produce leakage current, while the half-bridge circuit is prone to leakage current between oscillation conversions, which deteriorates the waveform and generates interference. The full-bridge rectification efficiency is higher than that of the half-bridge rectification, and can have a larger working current output. Therefore, when the power supply 1 is 220V, the rectifier bridge can select a full-bridge packaged rectifier bridge with a forward current of 10A and a rated reverse voltage of 600V.

[0067] It can be understood that the same or similar parts of the above embodiments can be referenced to each other, and the contents not described in detail in some embodiments can refer to the same or similar contents in other embodiments.

[0068] It should be noted that, in the description of the present invention, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In addition, in the description of the present invention, unless otherwise specified, the meaning of "plurality" refers to at least two.

[0069] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, segment or portion of code that includes one or more executable instructions for implementing the steps of a specific logical function or process, and the scope of the preferred embodiments of the present invention includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in the reverse order depending on the functions involved, which should be understood by those skilled in the art to which the embodiments of the present invention belong.

[0070] It should be understood that the various parts of the present invention can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, a plurality of steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0071] A person skilled in the art may understand that all or part of the steps in the method for implementing the above-mentioned embodiment may be completed by instructing related hardware through a program, and the program may be stored in a computer-readable storage medium, which, when executed, includes one or a combination of the steps of the method embodiment.

[0072] In addition, each functional unit in each embodiment of the present invention may be integrated into a processing module, or each unit may exist physically separately, or two or more units may be integrated into one module. The above-mentioned integrated module may be implemented in the form of hardware or in the form of a software functional module. If the integrated module is implemented in the form of a software functional module and sold or used as an independent product, it may also be stored in a computer-readable storage medium.

[0073] The storage medium mentioned above can be a read-only memory, a magnetic disk or an optical disk, etc.

[0074] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0075] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A control power delay circuit, characterized in that: The circuit comprises: A power supply, a second rectifier bridge circuit and an energy storage capacitor circuit; The output end of the power supply is respectively connected to the input end of the energy storage capacitor circuit and the input end of the second rectifier bridge circuit, the energy storage capacitor circuit and the second rectifier bridge circuit are connected in parallel, and the output ends of the energy storage capacitor circuit and the second rectifier bridge circuit are respectively connected to the control system; The second rectifier bridge circuit is used to supply power to the control system during the charging process of the energy storage capacitor circuit and when the charging is completed, and the energy storage capacitor circuit is used to supply power to the control system when the power supply is cut off.

2. The circuit according to claim 1, characterized in that The energy storage capacitor circuit includes a fuse F1, a first rectifier bridge circuit, a current limiting resistor and an energy storage capacitor; The input end of the fuse F1 is connected to the phase line of the power supply, the output end of the fuse F1 is connected to the first input end of the first rectifier bridge circuit, the neutral line of the power supply is connected to the second input end of the first rectifier bridge circuit, the first output end of the first rectifier bridge circuit is connected to the input end of the current limiting resistor, the output end of the current limiting resistor is connected to the input end of the control system, and the second output end of the first rectifier bridge circuit is connected to the input end of the control system, so that the power supply, the first rectifier bridge circuit, the current limiting resistor and the control system form a loop; One end of the energy storage capacitor is connected to the line connecting the current limiting resistor and the control system, and the other end of the energy storage capacitor is connected to the line connecting the first rectifier bridge circuit and the control system.

3. The circuit according to claim 2, characterized in that The energy storage capacitor circuit also includes a third rectifier bridge circuit, the output end of the current limiting resistor is connected to the first input end of the third rectifier bridge circuit, the second output end of the first rectifier bridge circuit is connected to the second input end of the third rectifier bridge circuit, and the first output end and the second output end of the third rectifier bridge circuit are respectively connected to the control system; One end of the energy storage capacitor is connected to the line connecting the current limiting resistor and the third rectifier bridge, and the other end of the energy storage capacitor is connected to the line connecting the first rectifier bridge circuit and the third rectifier bridge.

4. The circuit according to claim 3, characterized in that The energy storage capacitor includes multiple energy storage capacitors, and the multiple energy storage capacitors are connected in parallel.

5. The circuit according to claim 4, characterized in that The current limiting resistor includes two current limiting resistors, which are connected in parallel.

6. The circuit according to claim 5, characterized in that The two current limiting resistors are both 8W resistors with a resistance of 250Ω.

7. The circuit according to claim 6, characterized in that The fuse F1 is a fuse with a rated voltage of 250V and a rated current of 10A.

8. The circuit according to claim 7, characterized in that The first rectifier bridge circuit, the second rectifier bridge circuit and the third rectifier bridge circuit all use a rectifier bridge with a rated forward current of 10A and a rated reverse voltage of 600V, which is composed of 4 rectifier diodes connected in the form of a bridge full-wave rectifier circuit and packaged as an integrated whole.

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