Power output single-side bridge arm protection circuit and portable mobile power supply

Abstract

The present disclosure provides a power output single-side bridge arm protection circuit and a portable mobile power supply. The circuit includes a single-side bridge arm acquisition circuit and a power drive self-locking circuit; the single-side bridge arm acquisition circuit includes a bridge arm and a gate operator and an acquisition isolation diode; the power drive self-locking circuit includes a first electronic switch tube, a second electronic switch tube, a first resistor and a second resistor, the first end of the first electronic switch tube is used to connect to the enable end of the power drive chip, the power supply end of the bridge arm and the gate operator is also connected to the control end of the first electronic switch tube through the first resistor, the negative pole of the acquisition isolation diode is connected to the control end of the second electronic switch tube, and the control end of the second electronic switch tube is also connected to the first end of the first electronic switch tube. When the two MOS tubes of the same-side bridge arm are turned on at the same time, the first electronic switch tube is turned on, which is convenient for outputting an enable signal to stop working to the power drive chip to shut down the power drive chip.

Description

Technical Field

[0001] The present disclosure relates to the field of energy storage technology, and in particular to a power output single-side bridge arm protection circuit and a portable mobile power supply. Background Art

[0002] In the field of new energy, portable power banks are becoming more and more popular, and such products generally have DC and AC output functions, such as USB-A / USB-C / AC 110V or 220V output, etc., which have brought great convenience to people's daily lives. The DC-DC part adopts circuit topology architectures such as BUCK / BOOST / BUCK-BOOST. For higher efficiency, such circuits use enhanced N-channel MOS tubes as synchronous rectification, and the DC-AC part adopts circuit topology architectures such as full bridge (H bridge). The common method is to use MCU to generate PWM drive waveforms, and also add dead zones to the output PWM drive waveforms of the upper and lower bridge arm MOS tubes on one side to prevent the upper and lower bridge arm MOS tubes on one side from being turned on at the same time. For example, the patent application with application number CN111490705A.

[0003] However, in the traditional anti-simultaneous conduction solution, when the MCU is working, it will be disturbed by many external factors and become unstable, resulting in the simultaneous conduction of the upper and lower bridge arm MOS tubes on one side, which can easily cause damage to the power MOS tube and affect the safety and reliability of the power supply during use. Utility Model Content

[0004] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a power output single-side bridge arm protection circuit and a portable mobile power supply that improve the safety and reliability of use.

[0005] The purpose of this disclosure is achieved through the following technical solutions:

[0006] A power supply output single-side bridge arm protection circuit, comprising: a single-side bridge arm acquisition circuit and a power drive self-locking circuit; the single-side bridge arm acquisition circuit comprises a bridge arm and a gate operator and an acquisition isolation diode, the first sampling comparison end of the bridge arm and the gate operator is used to drive an output signal with a first same-side bridge arm, the second sampling comparison end of the bridge arm and the gate operator is used to drive an output signal with a second same-side bridge arm, and the output end of the bridge arm and the gate operator is connected to the positive electrode of the acquisition isolation diode; the power drive self-locking circuit comprises a first electronic switch tube, a second electronic switch tube, a first resistor and a second resistor, the bridge arm and the gate operator The power supply end is connected to the second end of the first electronic switch tube, the first end of the first electronic switch tube is used to be connected to the enable end of the power driving chip, the power supply end of the bridge arm and the gate operator is also connected to the control end of the first electronic switch tube through the first resistor, the control end of the first electronic switch tube is connected to the first end of the second electronic switch tube through the second resistor, the second end of the second electronic switch tube is connected to the negative pole of the power supply, the negative pole of the collection isolation diode is connected to the control end of the second electronic switch tube, wherein the control end of the second electronic switch tube is also connected to the first end of the first electronic switch tube.

[0007] In one embodiment, the power drive self-locking circuit further includes a third resistor, and the cathode of the collection isolation diode is connected to the cathode of the power supply through the third resistor.

[0008] In one embodiment, the power drive self-locking circuit further includes a fourth resistor, and the cathode of the collection isolation diode is connected to the control end of the second electronic switch tube through the fourth resistor.

[0009] In one embodiment, the power drive self-locking circuit further includes a fifth resistor, and the control end of the second electronic switch tube is connected to the negative electrode of the power supply through the fifth resistor.

[0010] In one embodiment, at least one of the first resistor and the second resistor is a variable resistor.

[0011] In one embodiment, the power drive self-locking circuit further includes a first capacitor, and the power supply end of the bridge arm and the gate operator is connected to the negative electrode of the power supply through the first capacitor.

[0012] In one embodiment, the power drive self-locking circuit further includes an output isolation diode, the first end of the first electronic switch tube is connected to the anode of the output isolation diode, and the cathode of the output isolation diode is connected to the enable end.

[0013] In one embodiment, the power drive self-locking circuit further includes a second capacitor, and the cathode of the output isolation diode is connected to the cathode of the power supply through the second capacitor.

[0014] In one embodiment, the power drive self-locking circuit further includes a sixth resistor, and the cathode of the output isolation diode is connected to the cathode of the power supply through the sixth resistor.

[0015] A portable mobile power source comprises the power output single-side bridge arm protection circuit described in any one of the above embodiments.

[0016] Compared with the prior art, the present invention has at least the following advantages:

[0017] When the two MOS tubes of the same-side bridge arm are turned on at the same time, the level of the bridge arm and the gate operator output changes, so that the second electronic switch tube is turned on. At this time, the control terminal voltage of the first electronic switch tube changes synchronously, so that the first electronic switch tube is turned on, which is convenient for outputting an enable signal to stop working to the power driver chip to shut down the power driver chip. Moreover, the voltage of the output enable signal continues to provide a bias voltage for the first electronic switch tube, ensuring that the first electronic switch tube and the second electronic switch tube are always turned on, triggering the self-locking protection, and effectively improving the safety and reliability of the power output process. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present disclosure and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 A circuit diagram of a power supply output single-side bridge arm protection circuit in an embodiment;

[0020] Figure 2 for Figure 1 The circuit diagram of the single-side bridge arm acquisition circuit in the single-side bridge arm protection circuit of the power supply output is shown;

[0021] Figure 3 for Figure 1 The circuit diagram of the power drive self-locking circuit in the power supply output single-side bridge arm protection circuit is shown;. DETAILED DESCRIPTION

[0022] In order to facilitate the understanding of the present disclosure, the present disclosure will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present disclosure are given in the drawings. However, the present disclosure can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present disclosure more thoroughly and comprehensively understood.

[0023] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present disclosure. The terms used herein in the specification of the present disclosure are only for the purpose of describing specific embodiments and are not intended to limit the present disclosure. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0025] The present disclosure relates to a power supply output single-side bridge arm protection circuit. In one embodiment, the power supply output single-side bridge arm protection circuit includes a single-side bridge arm acquisition circuit and a power drive self-locking circuit; the single-side bridge arm acquisition circuit includes a bridge arm and a gate operator and an acquisition isolation diode, the first sampling comparison end of the bridge arm and the gate operator is used to drive the output signal with the first same-side bridge arm, the second sampling comparison end of the bridge arm and the gate operator is used to drive the output signal with the second same-side bridge arm, and the output end of the bridge arm and the gate operator is connected to the positive electrode of the acquisition isolation diode; the power drive self-locking circuit includes a first electronic switch tube, a second electronic switch tube, a first resistor and a second resistor, the bridge arm and The power supply end of the gate operator is connected to the second end of the first electronic switch tube, the first end of the first electronic switch tube is used to connect to the enable end of the power driver chip, the bridge arm and the power supply end of the gate operator are also connected to the control end of the first electronic switch tube through the first resistor, the control end of the first electronic switch tube is connected to the first end of the second electronic switch tube through the second resistor, the second end of the second electronic switch tube is connected to the negative electrode of the power supply, the negative electrode of the acquisition isolation diode is connected to the control end of the second electronic switch tube, wherein the control end of the second electronic switch tube is also connected to the first end of the first electronic switch tube. When the two MOS tubes of the same side bridge arm are turned on at the same time, the level of the bridge arm and the gate operator output changes, so that the second electronic switch tube is turned on, and at this time, the control end voltage of the first electronic switch tube changes synchronously, so that the first electronic switch tube is turned on, which is convenient for outputting an enable signal to stop working to the power driver chip to shut down the power driver chip, and the voltage of the output enable signal continuously provides a bias voltage for the first electronic switch tube, ensuring that the first electronic switch tube and the second electronic switch tube are always turned on, triggering self-locking protection, and effectively improving the safety and reliability of the power output process.

[0026] See also Figure 1 , which is a circuit diagram of a power supply output single-side bridge arm protection circuit according to an embodiment of the present disclosure.

[0027] The power output single-side bridge arm protection circuit 10 of one embodiment includes a single-side bridge arm acquisition circuit 100 and a power drive self-locking circuit 200. Please refer to Figure 2 The single-side bridge arm acquisition circuit 100 includes a bridge arm AND gate operator U1 and an acquisition isolation diode D3. The first sampling comparison terminal of the bridge arm AND gate operator U1 is used to drive the output signal with the first same-side bridge arm, and the second sampling comparison terminal of the bridge arm AND gate operator U1 is used to drive the output signal with the second same-side bridge arm, and the output terminal of the bridge arm AND gate operator U1 is connected to the positive electrode of the acquisition isolation diode D3. Please refer to Figure 3 The power drive self-locking circuit 200 includes a first electronic switch tube Q1, a second electronic switch tube Q2, a first resistor R3 and a second resistor R7. The power supply end of the bridge arm and the gate operator U1 is connected to the second end of the first electronic switch tube Q1, and the first end of the first electronic switch tube Q1 is used to connect to the enable end SD / EN of the power drive chip. The power supply end of the bridge arm and the gate operator U1 is also connected to the control end of the first electronic switch tube Q1 through the first resistor R3, and the control end of the first electronic switch tube Q1 is connected to the first end of the second electronic switch tube Q2 through the second resistor R7. The second end of the second electronic switch tube Q2 is connected to the negative pole of the power supply, and the negative pole of the acquisition isolation diode D3 is connected to the control end of the second electronic switch tube Q2. Among them, the control end of the second electronic switch tube Q2 is also connected to the first end of the first electronic switch tube Q1.

[0028] In this embodiment, when the two MOS tubes of the same-side bridge arm are turned on at the same time, the level output by the bridge arm and gate operator U1 changes, so that the second electronic switch tube Q2 is turned on. At this time, the control terminal voltage of the first electronic switch tube Q1 changes synchronously, so that the first electronic switch tube Q1 is turned on, which is convenient for outputting an enable signal to stop working to the power driver chip to shut down the power driver chip. Moreover, the voltage of the output enable signal continues to provide a bias voltage for the first electronic switch tube Q1, ensuring that the first electronic switch tube Q1 and the second electronic switch tube Q2 are always turned on, triggering the self-locking protection, and effectively improving the safety and reliability of the power output process.

[0029] Among them, the first same-side bridge arm drive output signal and the second same-side bridge arm drive output signal are the conduction signals of the upper and lower MOS tubes of the same-side bridge arm, for example, the first same-side bridge arm drive output signal is the PWM drive signal of the upper MOS tube of the right bridge arm, and the second same-side bridge arm drive output signal is the PWM drive signal of the lower MOS tube of the right bridge arm; for another example, the first same-side bridge arm drive output signal is the PWM drive signal of the upper MOS tube of the left bridge arm, and the second same-side bridge arm drive output signal is the PWM drive signal of the lower MOS tube of the left bridge arm. The bridge arm AND gate operator U1 performs an AND gate logic operation on the two conduction signals, and outputs the operation result through the output end of the bridge arm AND gate operator U1, for example, the first same-side bridge arm drive output signal and the second same-side bridge arm drive output signal are both high level, that is, the upper and lower MOS tubes of the same-side bridge arm are turned on at the same time, and the bridge arm AND gate operator U1 outputs a high level according to the AND gate logic circuit, so as to turn on the second electronic switch tube Q2 and the first electronic switch tube Q1.

[0030] In another embodiment, at least one of the first resistor R3 and the second resistor R7 is a variable resistor, and the first resistor R3 and the second resistor R7 form a voltage divider circuit to provide a specified turn-on voltage for the first electronic switch tube Q1.

[0031] In another embodiment, the first electronic switch tube Q1 is a PNP type transistor, the first end of the first electronic switch tube Q1 is the collector of the PNP type transistor, the second end of the first electronic switch tube Q1 is the emitter of the PNP type transistor, and the control end of the first electronic switch tube Q1 is the base of the PNP type transistor; the second electronic switch tube Q2 is an NPN type transistor, the first end of the second electronic switch tube Q2 is the collector of the NPN type transistor, the second end of the second electronic switch tube Q2 is the emitter of the NPN type transistor, and the control end of the second electronic switch tube Q2 is the base of the NPN type transistor.

[0032] In one embodiment, see Figure 3 The power drive self-locking circuit 200 further includes a third resistor R9, and the cathode of the collection isolation diode D3 is connected to the cathode of the power supply through the third resistor R9. In this embodiment, the first end of the third resistor R9 is connected to the cathode of the collection isolation diode D3, and the third resistor R9 and the collection isolation diode D3 form a voltage divider circuit, that is, the voltage on the third resistor R9 is loaded on the control end of the second electronic switch tube Q2, and the third resistor R9 provides a stable bias voltage for the second electronic switch tube Q2.

[0033] In one embodiment, see Figure 3, the power drive self-locking circuit 200 also includes a fourth resistor R8, and the cathode of the collection isolation diode D3 is connected to the control end of the second electronic switch tube Q2 through the fourth resistor R8. In this embodiment, the fourth resistor R8 is connected in series with the collection isolation diode D3, that is, the fourth resistor R8 is connected in series to the control end of the second electronic switch tube Q2, and the fourth resistor R8 limits the current of the comparison operation result signal output by the bridge arm and the gate operator U1, so as to ensure that the second electronic switch tube Q2 accurately receives the single-side bridge arm upper and lower MOS tube conduction operation control signal.

[0034] In one embodiment, see Figure 3 The power drive self-locking circuit 200 further includes a fifth resistor R10, and the control end of the second electronic switch tube Q2 is connected to the negative electrode of the power supply through the fifth resistor R10. In this embodiment, the first end of the fifth resistor R10 is connected to the control end of the second electronic switch tube Q2, and the second end of the fifth resistor R10 is connected to the second end of the second electronic switch tube Q2, that is, the fifth resistor R10 is connected in parallel between the control end and the second end of the second electronic switch tube Q2, so that the second electronic switch tube Q2 can be quickly turned on when the bias voltage is reached.

[0035] In one embodiment, see Figure 3 The power drive self-locking circuit 200 further includes a first capacitor C1, and the power supply end of the bridge arm and gate operator U1 is connected to the negative electrode of the power supply through the first capacitor C1. In this embodiment, the first capacitor C1 is connected to the power supply end of the bridge arm and gate operator U1, and the voltage output by the bridge arm and gate operator U1 is filtered, so that the enable voltage output by the first end of the first electronic switch tube Q1 is more stable, thereby facilitating the precise control of the working state of the power drive chip.

[0036] In one embodiment, see Figure 3 The power drive self-locking circuit 200 further includes an output isolation diode D1, a first end of the first electronic switch tube Q1 is connected to the anode of the output isolation diode D1, and a cathode of the output isolation diode D1 is connected to the enable terminal SD / EN. In this embodiment, the output isolation diode D1 is connected to the first end of the first electronic switch tube Q1, and the output isolation diode D1 conducts the output enable signal in a unidirectional manner, thereby preventing the current of the power drive chip from reversely impacting the first electronic switch tube Q1, and ensuring the stable operation of the first electronic switch tube Q1.

[0037] Furthermore, the power drive self-locking circuit 200 further includes a second capacitor C2, and the cathode of the output isolation diode D1 is connected to the cathode of the power supply through the second capacitor C2. In this embodiment, the second capacitor C2 is connected to the cathode of the output isolation diode D1, and the second capacitor C2 filters the output enable signal, so that the enable voltage of the power drive chip is more stable.

[0038] In another embodiment, the power drive self-locking circuit 200 further includes a sixth resistor R5, and the cathode of the output isolation diode D1 is connected to the cathode of the power supply through the sixth resistor R5. In this embodiment, the sixth resistor R5 is connected to the cathode of the output isolation diode D1, that is, the sixth resistor R5 is connected in parallel with the second capacitor C2. When the first electronic switch tube Q1 is turned off, the charge on the second capacitor C2 is consumed and released through the sixth resistor R5 to avoid the second capacitor C2 from causing a voltage pulse to the enable terminal SD / EN of the power drive chip, so as to reduce the probability of false triggering of the power drive chip.

[0039] In one of the embodiments, the present disclosure also relates to a portable mobile power supply, including the power output single-side bridge arm protection circuit described in any of the above embodiments. In this embodiment, the power output single-side bridge arm protection circuit includes a single-side bridge arm acquisition circuit and a power drive self-locking circuit; the single-side bridge arm acquisition circuit includes a bridge arm and gate operator and an acquisition isolation diode, the first sampling comparison end of the bridge arm and gate operator is used to drive the output signal with the first same-side bridge arm, the second sampling comparison end of the bridge arm and gate operator is used to drive the output signal with the second same-side bridge arm, and the output end of the bridge arm and gate operator is connected to the positive electrode of the acquisition isolation diode; the power drive self-locking circuit includes a first electronic switch tube, a second electronic switch tube, a first resistor and a second resistor, and the bridge arm and gate operator are connected to the positive electrode of the acquisition isolation diode. The power supply end of the operator is connected to the second end of the first electronic switch tube, the first end of the first electronic switch tube is used to connect to the enable end of the power driver chip, the power supply end of the bridge arm and the gate operator is also connected to the control end of the first electronic switch tube through the first resistor, the control end of the first electronic switch tube is connected to the first end of the second electronic switch tube through the second resistor, the second end of the second electronic switch tube is connected to the negative electrode of the power supply, the negative electrode of the acquisition isolation diode is connected to the control end of the second electronic switch tube, wherein the control end of the second electronic switch tube is also connected to the first end of the first electronic switch tube. When the two MOS tubes of the same side bridge arm are turned on at the same time, the level output by the bridge arm and the gate operator changes, so that the second electronic switch tube is turned on, and at this time, the control end voltage of the first electronic switch tube changes synchronously, so that the first electronic switch tube is turned on, which is convenient for outputting the enable signal of stopping work to the power driver chip to shut down the power driver chip, and the voltage of the output enable signal continuously provides a bias voltage for the first electronic switch tube, ensuring that the first electronic switch tube and the second electronic switch tube are always turned on, triggering the self-locking protection, and effectively improving the safety and reliability of the power output process.

[0040] The above-described embodiments only express several implementation methods of the present disclosure, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present disclosure. It should be pointed out that, for a person of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present disclosure, and these all belong to the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure shall be subject to the attached claims.

Claims

1. A power output single-side bridge arm protection circuit, characterized in that: include: A single-side bridge arm acquisition circuit, the single-side bridge arm acquisition circuit includes a bridge arm and a gate operator and an acquisition isolation diode, the first sampling comparison end of the bridge arm and the gate operator is used to drive an output signal with the first same-side bridge arm, the second sampling comparison end of the bridge arm and the gate operator is used to drive an output signal with the second same-side bridge arm, and the output end of the bridge arm and the gate operator is connected to the positive electrode of the acquisition isolation diode; A power drive self-locking circuit, the power drive self-locking circuit includes a first electronic switch tube, a second electronic switch tube, a first resistor and a second resistor, the power supply end of the bridge arm and the gate operator is connected to the second end of the first electronic switch tube, the first end of the first electronic switch tube is used to be connected to the enable end of the power drive chip, the power supply end of the bridge arm and the gate operator is also connected to the control end of the first electronic switch tube through the first resistor, the control end of the first electronic switch tube is connected to the first end of the second electronic switch tube through the second resistor, the second end of the second electronic switch tube is connected to the negative pole of the power supply, the negative pole of the collection isolation diode is connected to the control end of the second electronic switch tube, wherein the control end of the second electronic switch tube is also connected to the first end of the first electronic switch tube.

2. The power output single-side bridge arm protection circuit according to claim 1, characterized in that: The power drive self-locking circuit also includes a third resistor, and the cathode of the collection isolation diode is connected to the cathode of the power supply through the third resistor.

3. The power output single-side bridge arm protection circuit according to claim 1, characterized in that: The power drive self-locking circuit also includes a fourth resistor, and the cathode of the collection isolation diode is connected to the control end of the second electronic switch tube through the fourth resistor.

4. The power output single-side bridge arm protection circuit according to claim 1, characterized in that: The power drive self-locking circuit also includes a fifth resistor, and the control end of the second electronic switch tube is connected to the negative electrode of the power supply through the fifth resistor.

5. The power output single-side bridge arm protection circuit according to claim 1, characterized in that: At least one of the first resistor and the second resistor is a variable resistor.

6. The power output single-side bridge arm protection circuit according to claim 1, characterized in that: The power drive self-locking circuit further includes a first capacitor, and the power supply end of the bridge arm and the gate operator is connected to the negative electrode of the power supply through the first capacitor.

7. The power output single-side bridge arm protection circuit according to claim 1, characterized in that: The power drive self-locking circuit also includes an output isolation diode, the first end of the first electronic switch tube is connected to the positive electrode of the output isolation diode, and the negative electrode of the output isolation diode is connected to the enable end.

8. The power output single-side bridge arm protection circuit according to claim 7, characterized in that: The power drive self-locking circuit also includes a second capacitor, and the cathode of the output isolation diode is connected to the cathode of the power supply through the second capacitor.

9. The power output single-side bridge arm protection circuit according to claim 7, characterized in that: The power drive self-locking circuit also includes a sixth resistor, and the cathode of the output isolation diode is connected to the cathode of the power supply through the sixth resistor.

10. A portable mobile power source, characterized in that: It comprises a power supply output single-side bridge arm protection circuit as claimed in any one of claims 1 to 9.

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