Power supply control circuit and uninterruptible power supply

Abstract

This invention provides a power control circuit and an uninterruptible power supply (UPS). The power control circuit includes a delay circuit, a fast discharge circuit, and a power amplifier circuit. The first input terminal of the delay circuit is connected to the shutdown signal output terminal of the digital signal processor in the UPS; the second input terminal of the delay circuit is connected to the positive terminal output terminal of the battery in the UPS; the output terminal of the delay circuit is connected to the input terminal of the fast discharge circuit; the output terminal of the fast discharge circuit is connected to the input terminal of the power amplifier circuit; the output terminal of the power amplifier circuit is connected to the shutdown signal input terminal of the auxiliary power supply in the UPS; the first delay duration of the shutdown signal output terminal of the delay circuit is greater than a preset duration, where the preset duration is the duration required for the auxiliary power supply to be completely shut down; the fast discharge circuit shortens the first duration to a second duration. This invention can solve the problem of repeated on / off switching of the auxiliary power supply during the shutdown process.

Description

Technical Field

[0001] This invention relates to the field of power supply equipment technology, and in particular to a power control circuit and an uninterruptible power supply. Background Technology

[0002] UPS (Uninterruptible Power Supply) is a power supply device with a wide range of applications. As users' power requirements continue to increase, UPS manufacturers are constantly improving the performance of UPS devices and the user experience.

[0003] When a UPS malfunctions or malfunctions, the auxiliary power supply (DC-DC power module) is usually shut down to ensure equipment safety. However, research has revealed that during the shutdown process, the auxiliary power supply frequently switches on and off repeatedly, resulting in a poor user experience. Summary of the Invention

[0004] This invention provides a power control circuit and an uninterruptible power supply to solve the problem of repeated switching on and off of the auxiliary power supply during the process of shutting down the auxiliary power supply.

[0005] In a first aspect, embodiments of the present invention provide a power control circuit applied to an uninterruptible power supply, the power control circuit including a delay circuit, a fast discharge circuit and a power amplifier circuit; The first input terminal of the delay circuit is connected to the shutdown signal output terminal of the digital signal processor in the uninterruptible power supply; the second input terminal of the delay circuit is connected to the positive output terminal of the battery in the uninterruptible power supply; the output terminal of the delay circuit is connected to the input terminal of the fast discharge circuit; the output terminal of the fast discharge circuit is connected to the input terminal of the power amplifier circuit; and the output terminal of the power amplifier circuit is connected to the shutdown signal input terminal of the auxiliary power supply in the uninterruptible power supply. The delay circuit delays the shutdown signal at the output terminal of the shutdown signal for a first duration that is greater than a preset duration, which is the duration required for the auxiliary power supply to be completely shut off. The fast discharge circuit shortens the first duration to a second duration, which is equal to a preset multiple of the preset duration, where the preset multiple is a multiple greater than one and less than a preset value.

[0006] In one possible implementation, the delay circuit includes a first switching transistor, a first RC delay circuit, and a second RC delay circuit; The input terminal of the first RC delay circuit is the first input terminal of the delay circuit, and the output terminal of the first RC delay circuit is connected to the base of the first switching transistor; the collector of the first switching transistor is the second input terminal of the delay circuit, and the emitter of the first switching transistor is connected to the input terminal of the second RC delay circuit; the output terminal of the second RC delay circuit is the output terminal of the delay circuit.

[0007] In one possible implementation, the first RC delay circuit includes a first resistor, a second resistor, and a first capacitor; One end of the first resistor is the input terminal of the first RC delay circuit, and the other end of the first resistor is the output terminal of the first RC delay circuit. The other end of the first resistor is connected to the negative output terminal of the battery in the uninterruptible power supply through the first capacitor. The second resistor is connected between the base and emitter of the first switching transistor.

[0008] In one possible implementation, the time constant of the first RC delay circuit is less than a preset duration.

[0009] In one possible implementation, the second RC delay circuit includes a third resistor and a second capacitor; One end of the third resistor is the input terminal of the second RC delay circuit, and the other end of the third resistor is the output terminal of the second RC delay circuit. The other end of the third resistor is connected to the negative output terminal of the battery in the uninterruptible power supply through the second capacitor.

[0010] In one possible implementation, the fast discharge circuit includes a fourth resistor and a fifth resistor; One end of the fourth resistor is the input terminal of the fast discharge circuit, and the other end of the fourth resistor is the output terminal of the fast discharge circuit. The other end of the fourth resistor is connected to the negative output terminal of the battery in the uninterruptible power supply through the fifth resistor.

[0011] In one possible implementation, the power amplifier circuit includes a second switching transistor; the base of the second switching transistor is the input terminal of the power amplifier circuit, the collector of the second switching transistor is the output terminal of the power amplifier circuit, and the emitter of the second switching transistor is connected to the negative terminal output of the battery in the uninterruptible power supply.

[0012] In one possible implementation, the preset value range is [1.2, 2].

[0013] Secondly, embodiments of the present invention provide an uninterruptible power supply, including the power control circuit described in the first aspect or any possible implementation thereof.

[0014] This invention provides a power control circuit and an uninterruptible power supply (UPS). The power control circuit incorporates a delay circuit that extends the duration of the shutdown signal. Since this extended duration exceeds the time required for the auxiliary power supply to be completely shut down, the delay circuit ensures the auxiliary power supply is completely turned off, thus solving the problem of repeated on / off cycles during the auxiliary power supply shutdown process and improving user experience. Furthermore, the fast discharge circuit in this power control circuit ensures that the extended shutdown signal duration is only slightly longer than the time required for the auxiliary power supply to be completely shut down. This solves the problem of repeated on / off cycles without excessively extending the shutdown signal duration, preventing issues such as the inability to quickly start the auxiliary power supply, further enhancing the user experience. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of a power control circuit provided in an embodiment of the present invention; Figure 2 This is a circuit diagram of a power control circuit provided in an embodiment of the present invention. Detailed Implementation

[0017] In the following description, specific details such as particular system architectures and techniques are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of the invention. However, those skilled in the art will understand that the invention can be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, apparatuses, circuits, and methods are omitted so as not to obscure the description of the invention with unnecessary detail.

[0018] To make the objectives, technical solutions, and advantages of the present invention clearer, specific embodiments will be described below in conjunction with the accompanying drawings.

[0019] As described in relevant technical documents, when a UPS malfunctions or malfunctions, the auxiliary power supply is usually shut down to ensure equipment safety. However, during the shutdown process, the auxiliary power supply frequently switches on and off repeatedly.

[0020] After extensive disassembly and testing, the applicant discovered that when a UPS malfunction or abnormality is detected, the UPS's Digital Signal Processor (DSP) sends a shutdown signal to the auxiliary power supply to shut it down. Furthermore, while the auxiliary power supply is executing its shutdown procedure, it cannot supply power to the DSP, causing the DSP to shut down due to power loss. However, the complete shutdown of the auxiliary power supply takes time. Since the shutdown signal is transient and cannot continuously affect the auxiliary power supply, the shutdown procedure is interrupted and the auxiliary power supply is restarted. Additionally, because the auxiliary power supply is not completely shut down, its self-sustaining function can still generate power and supply the DSP, causing the DSP to restart and send a shutdown signal to the auxiliary power supply again. This results in the auxiliary power supply repeatedly turning on and off.

[0021] To address the problems of the prior art, embodiments of the present invention provide a power control circuit and an uninterruptible power supply. The power control circuit provided in the embodiments of the present invention will be described first.

[0022] This power control circuit can be applied to uninterruptible power supplies, such as... Figure 1 As shown, the power control circuit includes a delay circuit 1, a fast discharge circuit 2, and a power amplifier circuit 3. The first input terminal of the delay circuit 1 is connected to the shutdown signal output terminal of the digital signal processor in the uninterruptible power supply (UPS). The second input terminal of the delay circuit 1 is connected to the positive output terminal of the battery in the UPS. The output terminal of the delay circuit 1 is connected to the input terminal of the fast discharge circuit 2. The output terminal of the fast discharge circuit 2 is connected to the input terminal of the power amplifier circuit 3. The output terminal of the power amplifier circuit 3 is connected to the shutdown signal input terminal of the auxiliary power supply in the UPS.

[0023] Specifically, on the one hand, the delay circuit 1 delays the shutdown signal at the shutdown signal output terminal for a first duration longer than a preset duration, which is the duration required for the auxiliary power supply to be completely shut off. On the other hand, the fast discharge circuit 2 shortens the first duration to a second duration, which is equal to a preset duration that is a multiple of a preset multiple, where the preset multiple is a multiple greater than one and less than a preset value.

[0024] Thus, by using a delay circuit, the duration of the shutdown signal can be extended. Since this extended duration exceeds the time required for the auxiliary power supply to be completely shut down, the delay circuit ensures the auxiliary power supply is completely turned off, thereby resolving the issue of repeated on / off cycles during the shutdown process and improving the user experience. Furthermore, the fast discharge circuit ensures that the extended shutdown signal duration is only slightly longer than the time required for the auxiliary power supply to be completely shut down. This solves the problem of repeated on / off cycles without excessively extending the shutdown signal duration, avoiding the problem of the auxiliary power supply failing to start quickly due to excessive extension.

[0025] The following section details why excessively prolonged shutdown signal duration can lead to the inability to quickly restart the auxiliary power supply. Taking a false alarm as an example, if a UPS fault or anomaly is detected as a false alarm, it can be resolved quickly, and the auxiliary power supply will be restarted rapidly. However, if the shutdown signal duration is excessively prolonged, the auxiliary power supply cannot be restarted under its influence, resulting in the inability to quickly start the auxiliary power supply, which introduces new user experience problems. The fast discharge circuit in this embodiment ensures that the extended shutdown signal duration is only slightly longer than the time required for the auxiliary power supply to be completely shut down. This avoids excessively prolonged shutdown signal duration, thus solving the problem of repeated auxiliary power supply on / off cycles without introducing new user experience issues such as the inability to quickly start the auxiliary power supply.

[0026] In one possible implementation, the delay circuit may include a first switching transistor, a first RC delay circuit, and a second RC delay circuit. Specifically, the input terminal of the first RC delay circuit is the first input terminal of the delay circuit, and the output terminal of the first RC delay circuit is connected to the base of the first switching transistor; the collector of the first switching transistor is the second input terminal of the delay circuit, and the emitter of the first switching transistor is connected to the input terminal of the second RC delay circuit; the output terminal of the second RC delay circuit is the output terminal of the delay circuit.

[0027] In one possible implementation, the first RC delay circuit may include a first resistor, a second resistor, and a first capacitor. Specifically, one end of the first resistor is the input terminal of the first RC delay circuit, and the other end of the first resistor is the output terminal of the first RC delay circuit. The other end of the first resistor is connected to the negative output terminal of the battery in the uninterruptible power supply through the first capacitor. The second resistor is connected between the base and emitter of the first switching transistor.

[0028] In one possible implementation, the time constant of the first RC delay circuit is less than a preset duration. It should be noted that if the time constant of the first RC delay circuit is greater than the preset duration, i.e., the duration required for the auxiliary power supply to be completely turned off, it will increase the difficulty for the fast discharge circuit to shorten the aforementioned first duration. However, if the time constant of the first RC delay circuit is designed to be less than the preset duration, the difficulty of shortening the fast discharge circuit can be reduced, thereby reducing the circuit implementation cost.

[0029] In one possible implementation, the second RC delay circuit includes a third resistor and a second capacitor. Specifically, one end of the third resistor is the input terminal of the second RC delay circuit, the other end of the third resistor is the output terminal of the second RC delay circuit, and the other end of the third resistor is connected to the negative terminal of the battery in the uninterruptible power supply through the second capacitor.

[0030] In one possible implementation, the fast discharge circuit includes a fourth resistor and a fifth resistor. Specifically, one end of the fourth resistor is the input terminal of the fast discharge circuit, the other end of the fourth resistor is the output terminal of the fast discharge circuit, and the other end of the fourth resistor is connected to the negative terminal of the battery in the uninterruptible power supply through the fifth resistor.

[0031] In one possible implementation, the power amplifier circuit includes a second switching transistor. Specifically, the base of the second switching transistor is the input terminal of the power amplifier circuit, the collector of the second switching transistor is the output terminal of the power amplifier circuit, and the emitter of the second switching transistor is connected to the negative terminal output of the battery in the uninterruptible power supply.

[0032] In one possible implementation, the preset value ranges from [1.2, 2]. Taking a preset value of 1.5 as an example, the fast discharge circuit can shorten the final delay time to 1.5 times the preset time, which is sufficient to ensure that the auxiliary power supply is started quickly. It should be noted that the value range of [1.2, 2] is only an example and can be flexibly set according to the actual working conditions of the auxiliary power supply; it is not specifically limited here.

[0033] like Figure 2As shown below, a circuit diagram of a power control circuit is provided. The first RC delay circuit in delay circuit 1 includes resistors R1 and R2 and capacitor C1, while the second RC delay circuit includes resistor R3 and capacitor C2. When the uninterruptible power supply (UPS) fails or encounters other abnormal problems, the DSP sends a POWER-OFF signal, which is a high-level signal. At this time, capacitor C1 charges, the first switch Q1 turns on, C2 charges, and the second switch Q2 turns on. Because the second switch Q2 is on, the auxiliary power supply receives the shutdown signal and executes the shutdown procedure, disconnecting the power supply to the DSP. When the power supply from the auxiliary power supply to the DSP is less than the DSP's operating voltage, the DSP cannot send a high-level POWER-OFF signal, causing the POWER-OFF signal to become a low-level signal. At this time, capacitor C1 begins to discharge. The discharge time of C1 is sufficient to keep the first switch Q1 on, allowing the voltage signal output from the positive terminal of the battery to continuously supply the auxiliary power supply. When capacitor C1 finishes discharging, the first switch Q1 turns off, but capacitor C2 continues to discharge, thus keeping Q2 on and maintaining the effect of the shutdown signal on the auxiliary power supply. In this way, the auxiliary power supply is completely shut off. Resistors R4 and R5 allow capacitor C2 to discharge quickly. After capacitor C2 finishes discharging, the second switch Q2 turns off, preventing the shutdown signal from affecting the auxiliary power supply and ensuring that the auxiliary power supply can be quickly turned on.

[0034] The above-described embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included within the protection scope of the present invention.

Claims

1. A power supply control circuit, characterized in that, Applied to uninterruptible power supplies, the power control circuit includes a delay circuit, a fast discharge circuit, and a power amplifier circuit; The first input terminal of the delay circuit is connected to the shutdown signal output terminal of the digital signal processor in the uninterruptible power supply (UPS); the second input terminal of the delay circuit is connected to the positive output terminal of the battery in the UPS; the output terminal of the delay circuit is connected to the input terminal of the fast discharge circuit; the output terminal of the fast discharge circuit is connected to the input terminal of the power amplifier circuit; the output terminal of the power amplifier circuit is connected to the shutdown signal input terminal of the auxiliary power supply in the UPS; the delay circuit includes a first switching transistor, a first RC delay circuit, and a second RC delay circuit; the input terminal of the first RC delay circuit is the first input terminal of the delay circuit; the output terminal of the first RC delay circuit is connected to the base of the first switching transistor; the collector of the first switching transistor is the second input terminal of the delay circuit; the emitter of the first switching transistor is connected to the input terminal of the second RC delay circuit; the output terminal of the second RC delay circuit is the output terminal of the delay circuit. The first duration for which the delay circuit delays the shutdown signal at the output terminal of the shutdown signal is greater than a preset duration, wherein the preset duration is the duration required for the auxiliary power supply to be completely shut off. The fast discharge circuit shortens the first duration to a second duration, the second duration being equal to a preset duration that is a preset multiple, the preset multiple being a multiple greater than one and less than a preset value.

2. The power control circuit according to claim 1, characterized in that, The first RC delay circuit includes a first resistor, a second resistor, and a first capacitor; One end of the first resistor is the input terminal of the first RC delay circuit, and the other end of the first resistor is the output terminal of the first RC delay circuit. The other end of the first resistor is connected to the negative output terminal of the battery in the uninterruptible power supply through the first capacitor. The second resistor is connected across the base and emitter of the first switching transistor.

3. The power control circuit according to claim 1 or 2, characterized in that, The time constant of the first RC delay circuit is less than the preset duration.

4. The power control circuit according to claim 1, characterized in that, The second RC delay circuit includes a third resistor and a second capacitor; One end of the third resistor is the input terminal of the second RC delay circuit, and the other end of the third resistor is the output terminal of the second RC delay circuit. The other end of the third resistor is connected to the negative output terminal of the battery in the uninterruptible power supply through the second capacitor.

5. The power control circuit according to claim 1, characterized in that, The fast discharge circuit includes a fourth resistor and a fifth resistor; One end of the fourth resistor is the input terminal of the fast discharge circuit, and the other end of the fourth resistor is the output terminal of the fast discharge circuit. The other end of the fourth resistor is connected to the negative terminal of the battery in the uninterruptible power supply through the fifth resistor.

6. The power control circuit according to claim 1, characterized in that, The power amplifier circuit includes a second switching transistor; the base of the second switching transistor is the input terminal of the power amplifier circuit, the collector of the second switching transistor is the output terminal of the power amplifier circuit, and the emitter of the second switching transistor is connected to the negative terminal output of the battery in the uninterruptible power supply.

7. The power control circuit according to claim 1, characterized in that, The preset value range is [1.2, 2].

8. An uninterruptible power supply, characterized in that, Includes the power control circuit as described in any one of claims 1 to 7.

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