Self-adaptive adjustment access control all-in-one machine power management circuit

Abstract

The utility model relates to the technical field of power supply management, in particular to a self-adaptive regulation access control all-in-one machine power supply management circuit, which comprises a rectifying unit, a first voltage reduction unit, a second voltage reduction unit and a comparison unit, the comparison unit comprises a comparator U1, a phase inverter U2, a fourth resistor R4, a fifth resistor R5 and a triode Q. The in-phase input end of the comparator U1 is connected with a reference voltage VCC, the inverting input end of the comparator U1 is connected with the output end of the rectification unit, the output end of the comparator U1 is connected with the input end of the phase inverter U2, the output end of the phase inverter U2 is connected with the enable end of the second step-down unit, the output end of the comparator U1 is further connected with the second end of the fourth resistor R4, and the output end of the fifth resistor R5 is connected with the output end of the triode Q. The first end of the fourth resistor R4 is connected with the base electrode of the triode Q, and the collector electrode of the triode Q is connected with the input end of the first voltage reduction unit. According to the utility model, the first step-down unit or the second step-down unit can be adaptively selected, the flexibility of power supply is improved, and the practicability is stronger.

Description

Technical Field

[0001] The utility model relates to the technical field of power management, and specifically, to a power management circuit for an access control integrated machine with adaptive adjustment. Background Technique

[0002] With the continuous development and progress of technology, the access control system, as an important part of modern intelligent buildings, has been widely applied in various scenarios, such as residential communities, office buildings, enterprises and institutions, etc.; the access control integrated machine, as the core device of the access control system, the performance of its power management circuit directly affects the stability and reliability of the entire system.

[0003] The traditional power management circuit design of the access control integrated machine is relatively simple, usually adopting a fixed voltage output mode, and the buck module therein is also relatively single. Common buck modules include the LDO circuit and the DCDC circuit. Among them, the LDO circuit can provide low noise and stable power, but due to the voltage drop limitation, it generally cannot be used for high voltage drop applications. The DCDC circuit can support a wide range of input voltages, but the cost is relatively high. Due to different usage environments and voltage fluctuations, it cannot adaptively select the buck mode, which will affect the subsequent access control electronic devices and has poor flexibility. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a power management circuit for an access control integrated machine with adaptive adjustment to solve the problems raised in the above background technique.

[0005] To achieve the above purpose, the utility model provides the following technical solutions:

[0006] A power management circuit for an access control integrated machine with adaptive adjustment, including a rectification unit, a first buck unit, a second buck unit and a comparison unit. The first buck unit buck-boosts based on an LDO chip, the second buck unit buck-boosts based on a DCDC chip, and the output end of the rectification unit is connected to the input end of the second buck unit;

[0007] The comparison unit includes a comparator U1, an inverter U2, a fourth resistor R4, a fifth resistor R5 and a triode Q. The non-inverting input end of the comparator U1 is connected to the reference voltage VCC, the inverting input end of the comparator U1 is connected to the output end of the rectification unit, the output end of the comparator U1 is connected to the input end of the inverter U2, the output end of the inverter U2 is connected to the enable end of the second buck unit, the output end of the comparator U1 is also connected to the second end of the fourth resistor R4, the emitter of the triode Q is connected to the output end of the rectification unit, the first end of the fourth resistor R4 is connected to the base of the triode Q, the collector of the triode Q is connected to the input end of the first buck unit, the first end of the fifth resistor R5 is connected to the emitter of the triode Q, and the second end of the fifth resistor R5 is connected to the base of the triode Q;

[0008] Wherein, when the reference voltage VCC is greater than the voltage at the output end of the rectification unit, the first step-down unit operates; conversely, the second step-down unit operates.

[0009] Preferably, the rectification unit includes a primary coil, a secondary coil, a rectifier bridge, and a first capacitor C1;

[0010] Both ends of the primary coil are connected to the commercial power supply of 220V, both ends of the secondary coil are respectively connected to two input ends of the rectifier bridge, and both output ends of the rectifier bridge are respectively connected to both ends of the first capacitor C1.

[0011] Preferably, the first step-down unit includes an LM317 chip, a first resistor R1, a variable resistor RL, and a second capacitor C2;

[0012] The input end of the LM317 chip is connected to the collector of the triode Q, the output end of the LM317 chip is connected to the first end of the second capacitor C2, the adjustment end of the LM317 chip is connected to the first end of the variable resistor RL, the first end of the first resistor R1 is connected to the output end of the LM317 chip, and the second ends of the variable resistor RL and the second capacitor C2 are both grounded.

[0013] Preferably, the second step-down unit includes an SY8113BADC chip, an inductor L, a second resistor R2, a third resistor R3, a third capacitor C3, a fourth capacitor C4, and a fifth capacitor C5;

[0014] The IN end of the SY8113BADC chip is connected to the output end of the rectification unit, the EN end of the SY8113BADC chip is connected to the output end of the inverter U2, the first end of the third capacitor C3 is connected to the LX end of the SY8113BADC chip, the second end of the third capacitor C3 is connected to the BS end of the SY8113BADC chip, the first end of the fifth capacitor C5 is connected to the first end of the fourth capacitor C4, the second end of the fifth capacitor C5 is grounded, the first end of the fourth capacitor C4 is connected to the first end of the inductor L, the second end of the fourth capacitor C4 is connected to the second end of the second resistor R2, the second end of the inductor L is connected to the LX end of the SY8113BADC chip, the first end of the second resistor R2 is connected to the first end of the inductor L, the second end of the second resistor R2 is connected to the FB end of the SY8113BADC chip, the first end of the third resistor R3 is connected to the second end of the second resistor R2, the second end of the third resistor R3 is grounded, and the GND end of the SY8113BADC chip is grounded.

[0015] Compared with the prior art, the beneficial effects of the present utility model are:

[0016] By setting a comparison unit, the utility model can adaptively select the first step-down unit or the second step-down unit. When the input voltage is normal, the first step-down unit outputs a low-noise and stable power supply. When the input voltage fluctuates, the second step-down unit with a wide input voltage range is used to protect the first step-down unit, while meeting the subsequent power supply requirements, improving the flexibility of power supply and having stronger practicability. Description of the Drawings

[0017] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0018] Figure 2 It is the circuit diagram of the rectification unit in the utility model;

[0019] Figure 3 It is the circuit diagram of the first step-down unit and the comparison unit in the utility model;

[0020] Figure 4 It is the circuit diagram of the second step-down unit and the comparison unit in the utility model.

[0021] In the figure:

[0022] 1. Rectification unit;

[0023] 2. First step-down unit;

[0024] 3. Second step-down unit;

[0025] 4. Comparison unit. Detailed Embodiment

[0026] Next, the technical solutions in the present utility model will be clearly and completely described in conjunction with the drawings in the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present utility model.

[0027] Please refer to Figures 1-4 , the present utility model provides a technical solution:

[0028] An access control integrated machine power management circuit with adaptive adjustment, including a rectification unit 1, a first step-down unit 2, a second step-down unit 3, and a comparison unit 4. The first step-down unit 2 steps down the voltage based on an LDO chip, the second step-down unit 3 steps down the voltage based on a DCDC chip, and the output end of the rectification unit 1 is connected to the input end of the second step-down unit 3;

[0029] The comparison unit 4 includes a comparator U1, an inverter U2, a fourth resistor R4, a fifth resistor R5, and a triode Q. The non-inverting input terminal of the comparator U1 is connected to the reference voltage VCC. The inverting input terminal of the comparator U1 is connected to the output terminal of the rectification unit 1. The output terminal of the comparator U1 is connected to the input terminal of the inverter U2. The output terminal of the inverter U2 is connected to the enable terminal of the second buck unit 3. The output terminal of the comparator U1 is also connected to the second terminal of the fourth resistor R4. The emitter of the triode Q is connected to the output terminal of the rectification unit 1. The first terminal of the fourth resistor R4 is connected to the base of the triode Q. The collector of the triode Q is connected to the input terminal of the first buck unit 2. The first terminal of the fifth resistor R5 is connected to the emitter of the triode Q. The second terminal of the fifth resistor R5 is connected to the base of the triode Q. The triode Q is a PNP type triode;

[0030] Among them, when the reference voltage VCC is greater than the voltage at the output terminal of the rectification unit 1, it indicates that the output voltage of the rectification unit 1 is within the normal range. The comparator U1 outputs a high level, the triode Q conducts, the rectification unit 1 supplies power to the first buck unit 2, the inverter U2 outputs a low level, and the first buck unit 2 works to provide a low-noise and stable power supply. Conversely, the comparator U1 outputs a low level, the triode Q is cut off, the inverter U2 outputs a high level, the rectification unit 1 supplies power to the second buck unit 3, and the second buck unit 3 works.

[0031] In this embodiment, the rectification unit 1 includes a primary coil, a secondary coil, a rectifier bridge, and a first capacitor C1;

[0032] Both ends of the primary coil are connected to the commercial power supply of 220V. Both ends of the secondary coil are respectively connected to the two input terminals of the rectifier bridge. The two output terminals of the rectifier bridge are respectively connected to both ends of the first capacitor C1. The primary coil and the secondary coil cooperate to play a role in primary voltage reduction. The rectifier bridge converts alternating current into direct current, and the first capacitor C1 plays a role in filtering.

[0033] Specifically, the first buck unit 2 includes an LM317 chip, a first resistor R1, a variable resistor RL, and a second capacitor C2;

[0034] The input terminal of the LM317 chip is connected to the collector of the triode Q. The output terminal of the LM317 chip is connected to the first terminal of the second capacitor C2. The adjustment terminal of the LM317 chip is connected to the first terminal of the variable resistor RL. The first terminal of the first resistor R1 is connected to the output terminal of the LM317 chip. The second terminal of the variable resistor RL and the second terminal of the second capacitor C2 are both grounded. The second capacitor C2 is a filter capacitor. Let the output voltage of the first buck unit 2 be V1, then the value of V1 can be obtained according to V1 = 1.25(1 + RL / R1).

[0035] In addition, the second buck unit 3 includes an SY8113BADC chip, an inductor L, a second resistor R2, a third resistor R3, a third capacitor C3, a fourth capacitor C4, and a fifth capacitor C5;

[0036] The IN terminal of the SY8113BADC chip is connected to the output terminal of the rectification unit 1, and the EN terminal of the SY8113BADC chip is connected to the output terminal of the inverter U2. The EN terminal of the SY8113BADC chip is the enable terminal. When the enable terminal is connected to a high level, the SY8113BADC chip works. The first terminal of the third capacitor C3 is connected to the LX terminal of the SY8113BADC chip, and the second terminal of the third capacitor C3 is connected to the BS terminal of the SY8113BADC chip. The first terminal of the fifth capacitor C5 is connected to the first terminal of the fourth capacitor C4, and the second terminal of the fifth capacitor C5 is grounded. The first terminal of the fourth capacitor C4 is connected to the first terminal of the inductor L, and the second terminal of the fourth capacitor C4 is connected to the second terminal of the second resistor R2. The second terminal of the inductor L is connected to the LX terminal of the SY8113BADC chip. The first terminal of the second resistor R2 is connected to the first terminal of the inductor L, and the second terminal of the second resistor R2 is connected to the FB terminal of the SY8113BADC chip. The first terminal of the third resistor R3 is connected to the second terminal of the second resistor R2, and the second terminal of the third resistor R3 is grounded. The GND terminal of the SY8113BADC chip is grounded. Let the output voltage of the second buck unit 3 be V2, then the value of V2 is obtained according to R3 = 0.6R2 / (V2 - 0.6).

[0037] When the adaptive adjustment access control integrated machine power management circuit of the present utility model is in use, the primary coil and the secondary coil in the rectification unit 1 cooperate to complete the buck operation, and then the rectification and filtering operations are completed through the rectifier bridge and the first capacitor C1. When the input voltage is normal, the reference voltage VCC is greater than the output voltage of the rectification unit 1, the comparator U1 outputs a high level, the triode Q conducts, and the rectification unit 1 supplies power to the first buck unit 2 to provide a low-noise and stable power supply. The inverter U2 outputs a low level, and the second buck unit 3 does not work. When the input voltage fluctuates, the reference voltage VCC is not greater than the output voltage of the rectification unit 1, the comparator U1 outputs a low level, the triode Q is cut off, the rectification unit 1 stops supplying power to the first buck unit 2 to prevent damage to the first buck unit 2 caused by excessive voltage. The inverter U2 outputs a high level, and the enable terminal of the SY8113BADC chip in the second buck unit 3 receives a high level, and the SY8113BADC chip works. The SY8113BADC chip can accept a wide range of input voltages to protect the first buck unit 2 and at the same time ensure that power can be provided, making it more flexible and practical.

[0038] The above shows and describes the basic principles, main features and advantages of the present utility model. Those skilled in the art of this industry should understand that the present utility model is not limited by the above embodiments. The above embodiments and the descriptions in the specification are only preferred examples of the present utility model and are not used to limit the present utility model. Without departing from the spirit and scope of the present utility model, the present utility model will have various changes and improvements, and these changes and improvements all fall within the scope of the present utility model claimed. The scope of protection claimed by the present utility model is defined by the appended claims and their equivalents.

Claims

1. An adaptively adjustable access control integrated machine power management circuit, comprising a rectifier unit (1), a first step-down unit (2), a second step-down unit (3) and a comparison unit (4), characterized in that: The first step-down unit (2) steps down the voltage based on an LDO chip, the second step-down unit (3) steps down the voltage based on a DCDC chip, and the output end of the rectifier unit (1) is connected to the input end of the second step-down unit (3); The comparison unit (4) comprises a comparator U1, an inverter U2, a fourth resistor R4, a fifth resistor R5 and a transistor Q, the comparator U1 having a non-inverting input terminal connected to a reference voltage VCC, the comparator U1 having an inverting input terminal connected to an output terminal of the rectifier unit (1), the comparator U1 having an output terminal connected to an input terminal of the inverter U2, the inverter U2 having an output terminal connected to an enable terminal of the second step-down unit (3), the comparator U1 having an output terminal further connected to a second terminal of a fourth resistor R4, the emitter of the transistor Q being connected to the output terminal of the rectifier unit (1), the first terminal of the fourth resistor R4 being connected to a base of the transistor Q, the collector of the transistor Q being connected to an input terminal of the first step-down unit (2), the first terminal of the fifth resistor R5 being connected to an emitter of the transistor Q, and the second terminal of the fifth resistor R5 being connected to a base of the transistor Q; When the reference voltage VCC is greater than the voltage at the output end of the rectifying unit (1), the first buck unit (2) operates, and vice versa, the second buck unit (3) operates.

2. The adaptively adjustable access control integrated machine power management circuit according to claim 1, characterized in that: The rectifier unit (1) comprises a primary coil, a secondary coil, a rectifier bridge and a first capacitor C1; Two ends of the primary coil are connected to the mains 220V, two ends of the secondary coil are connected to two input ends of the rectifier bridge respectively, and two output ends of the rectifier bridge are connected to two ends of the first capacitor C1 respectively.

3. The adaptively adjustable access control integrated machine power management circuit according to claim 1, characterized in that: The first voltage reduction unit (2) comprises an LM317 chip, a first resistor R1, an adjustable resistor RL and a second capacitor C2; The input end of the LM317 chip is connected to the collector of the transistor Q, the output end of the LM317 chip is connected to the first end of the second capacitor C2, the adjustment end of the LM317 chip is connected to the first end of the adjustable resistor RL, the first end of the first resistor R1 is connected to the output end of the LM317 chip, and the second end of the adjustable resistor RL and the second end of the second capacitor C2 are both grounded.

4. The adaptively adjustable access control integrated machine power management circuit according to claim 1, characterized in that: The second step-down unit (3) comprises a SY8113BADC chip, an inductor L, a second resistor R2, a third resistor R3, a third capacitor C3, a fourth capacitor C4 and a fifth capacitor C5; The IN terminal of the SY8113BADC chip is connected to the output terminal of the rectifier unit (1), the EN terminal of the SY8113BADC chip is connected to the output terminal of the inverter U2, the first terminal of the third capacitor C3 is connected to the LX terminal of the SY8113BADC chip, the second terminal of the third capacitor C3 is connected to the BS terminal of the SY8113BADC chip, the first terminal of the fifth capacitor C5 is connected to the first terminal of the fourth capacitor C4, the second terminal of the fifth capacitor C5 is grounded, the first terminal of the fourth capacitor C4 is connected to the first terminal of the inductor L, the second terminal of the fourth capacitor C4 is connected to the second terminal of the second resistor R2, the second terminal of the inductor L is connected to the LX terminal of the SY8113BADC chip, the first terminal of the second resistor R2 is connected to the first terminal of the inductor L, the second terminal of the second resistor R2 is connected to the FB terminal of the SY8113BADC chip, the first terminal of the third resistor R3 is connected to the second terminal of the second resistor R2, the second terminal of the third resistor R3 is grounded, and the GND terminal of the SY8113BADC chip is grounded.

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