Voltage stabilizing circuit of auxiliary power supply and auxiliary power supply system

Abstract

The utility model provides a voltage stabilizing circuit of an auxiliary power supply and an auxiliary power supply system, in the voltage stabilizing circuit, the input side of a power transmission module is connected with the output side of a main circuit in the auxiliary power supply; the output side of the power transmission module provides power supply voltage; namely, the power transmission module is used for transmitting the output electric energy of the main circuit in the auxiliary power supply and providing corresponding power supply voltage to the outside. Moreover, a negative feedback module is also arranged in the voltage stabilizing circuit, the input side of the negative feedback module is connected with the output side of the power transmission module, and the output side of the negative feedback module is connected with the input side of the power transmission module, so that negative feedback regulation can be carried out on the output voltage of the power transmission module. The power supply voltage change caused by various reasons such as fluctuation, interference and static electricity can be fed back to the input side of the power transmission module by the negative feedback module, and the voltage of the power transmission module generates reverse change, so that the change of the power supply voltage is inhibited, and the stability of the power supply voltage is ensured.

Description

Technical Field

[0001] The present application relates to the field of power electronics technology, and in particular to a voltage stabilizing circuit of an auxiliary power supply and an auxiliary power supply system. Background Art

[0002] For systems that require auxiliary power supplies, such as air-conditioning systems, the environment in which the auxiliary power supply is used is becoming increasingly complex, and is prone to fluctuations or interference, which will affect the normal operation of the powered circuits. In addition, during the production and installation process, the accumulation of static electricity through pins may also cause damage to the corresponding components. Therefore, it is very necessary to ensure the stability of the auxiliary power supply voltage. Utility Model Content

[0003] In view of this, the present application provides an auxiliary power supply voltage stabilizing circuit and an auxiliary power supply system to provide a stable auxiliary power supply voltage.

[0004] To achieve the above objectives, this application provides the following technical solutions:

[0005] The present application provides a voltage stabilizing circuit for an auxiliary power supply, comprising: a power transmission module and a negative feedback module; wherein:

[0006] The power transmission module is an active module, receiving power from a preset power source;

[0007] The input side of the power transmission module is connected to the output side of the main circuit in the auxiliary power supply;

[0008] The output side of the power transmission module provides a supply voltage;

[0009] The input side of the negative feedback module is connected to the output side of the power transmission module;

[0010] The output side of the negative feedback module is connected to the input side of the power transmission module.

[0011] Optionally, the power transmission module comprises: a first-stage amplifier circuit and a second-stage amplifier circuit;

[0012] The first-stage amplifier circuit and the second-stage amplifier circuit both receive power from the preset power supply;

[0013] The input side of the first-stage amplifier circuit serves as the input side of the power transmission module;

[0014] The output side of the first-stage amplifier circuit is connected to the input side of the second-stage amplifier circuit;

[0015] The output side of the second-stage amplifier circuit serves as the output side of the power transmission module.

[0016] Optionally, the first-stage amplifier circuit and the second-stage amplifier circuit both include: a common emitter amplifier circuit and a voltage divider resistor;

[0017] The voltage dividing resistor is arranged between the emitter of the common emitter amplifier circuit and the ground.

[0018] Optionally, the negative feedback module includes: a first resistor;

[0019] The first resistor is arranged between the emitter of the first-stage amplifier circuit and the emitter of the second-stage amplifier circuit.

[0020] Optionally, the power transmission module includes: a common emitter amplifier circuit.

[0021] Optionally, the negative feedback module includes: a second resistor; the second resistor is connected between the base and the collector of the common emitter amplifier circuit.

[0022] Optionally, the voltage stabilizing circuit of the auxiliary power supply further includes: a voltage stabilizing diode, which is arranged between two poles of the output side of the preset power supply.

[0023] Optionally, the preset power supply is: a three-terminal voltage regulator circuit.

[0024] Optionally, the voltage stabilizing circuit of the auxiliary power supply further includes: two filter capacitors, one of which is arranged between two poles on the input side of the power transmission module, and the other filter capacitor is arranged between two poles on the output side of the power transmission module.

[0025] A second aspect of the present application provides an auxiliary power supply system, comprising: an auxiliary power supply and a voltage stabilizing circuit of the auxiliary power supply as described in any one of the first aspects above.

[0026] The voltage stabilizing circuit of the auxiliary power supply provided by the present application has an input side of a power transmission module connected to the output side of the main circuit in the auxiliary power supply; the output side of the power transmission module provides a power supply voltage; that is, the power transmission module is used to transmit the output electric energy of the main circuit in the auxiliary power supply and provide a corresponding power supply voltage to the outside. Moreover, a negative feedback module is also provided in the voltage stabilizing circuit, the input side of which is connected to the output side of the power transmission module, and the output side of which is connected to the input side of the power transmission module, so that the output voltage of the power transmission module can be negatively feedback regulated. For the changes in the supply voltage caused by various reasons such as fluctuations, interference and static electricity, the negative feedback module will be fed back to the input side of the power transmission module, and the voltage will change in the opposite direction, thereby suppressing the change in the supply voltage and ensuring the stability of the supply voltage. In addition, the power transmission module is an active module, which receives the power supply of a preset power supply, which is more conducive to the stability of the supply voltage. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings to be used in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0029] Figure 1 A schematic diagram of a structure of a voltage stabilizing circuit of an auxiliary power supply provided in an embodiment of the present application;

[0030] Figure 2 A circuit diagram of a voltage stabilizing circuit for an auxiliary power supply provided in an embodiment of the present application;

[0031] Figure 3 Another circuit diagram of the voltage stabilizing circuit of the auxiliary power supply provided in an embodiment of the present application. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0033] In this application, the terms "comprises", "comprising" or any other variation thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of more restrictions, an element defined by the sentence "comprising a ..." does not exclude the presence of other identical elements in the process, method, article or device comprising the element.

[0034] The present application provides a voltage stabilizing circuit for an auxiliary power supply to provide a stable auxiliary power supply voltage.

[0035] like Figure 1 As shown in the figure, the voltage stabilizing circuit 10 of the auxiliary power supply includes: a power transmission module 101 and a negative feedback module 102; wherein:

[0036] The power transmission module 101 is an active module, which receives power from a preset power source; VCC shown in the figure is the output voltage of the preset power source.

[0037] The input side of the power transmission module 101 is connected to the output side of the main circuit 20 in the auxiliary power supply; that is, the output voltage of the main circuit 20 serves as the input voltage Ui of the power transmission module 101; the output side of the power transmission module 101 provides a power supply voltage; that is, the output voltage Uo of the power transmission module 101 serves as the power supply voltage.

[0038] Compared with the traditional solution, that is, the output voltage of the main circuit 20 in the auxiliary power supply is directly used as the power supply voltage to provide it to the subsequent electrical devices or circuits, this embodiment adds a power transmission module 101 on the output side of the auxiliary power supply main circuit 20. The power transmission module 101 transmits the output electric energy of the main circuit 20 in the auxiliary power supply, and finally provides the corresponding power supply voltage to the outside to power the subsequent electrical devices or circuits.

[0039] In addition, the input side of the negative feedback module 102 is connected to the output side of the power transmission module 101; and the output side of the negative feedback module 102 is connected to the input side of the power transmission module 101. When the output voltage Uo of the power transmission module 101 changes, it can be fed back to the input side of the power transmission module 101 by the negative feedback module 102, and the input voltage of the power transmission module 101 can change in the opposite direction, and then through the transmission of the power transmission module 101, the output voltage Uo of the power transmission module 101 is affected; that is, the negative feedback module 102 can perform negative feedback regulation on the output voltage Uo of the power transmission module 101.

[0040] The auxiliary power supply voltage stabilizing circuit 10 provided in this embodiment, through the above principle, can feedback the supply voltage changes caused by various reasons such as fluctuations, interference and static electricity to the input side of the power transmission module 101 through the negative feedback module 102, and make its voltage change in the opposite direction, thereby suppressing the change of the supply voltage and ensuring the stability of the supply voltage. In addition, since the power transmission module 101 is an active module, it can be more conducive to the stability of the supply voltage.

[0041] When applied to air conditioning systems or other systems, if the auxiliary power suddenly fluctuates or has other interference, the voltage stabilization circuit 10 can be used to ensure the voltage stability of the auxiliary power supply. Even if a sudden pulse occurs, the voltage stabilization circuit 10 can also play a protective role.

[0042] Based on the previous embodiment, this embodiment provides a specific structural diagram of the voltage stabilizing circuit 10, see Figure 2The power transmission module 101 includes: a first-stage amplifier circuit 201 and a second-stage amplifier circuit 202; wherein:

[0043] The first-stage amplifier circuit 201 and the second-stage amplifier circuit 202 are both powered by a preset power source.

[0044] The input side of the first-stage amplifier circuit 201 serves as the input side of the power transmission module 101 and receives the input voltage Ui.

[0045] The output side of the first-stage amplifier circuit 201 is connected to the input side of the second-stage amplifier circuit 202 .

[0046] The output side of the second-stage amplifier circuit 202 serves as the output side of the power transmission module 101 and generates an output voltage Uo.

[0047] In practical applications, the first-stage amplifier circuit 201 and the second-stage amplifier circuit 202 may both include: Figure 2 The common emitter amplifier circuit and the voltage dividing resistor (R11 or R12 as shown in the figure) shown in the figure; the voltage dividing resistor is arranged between the emitter of the corresponding common emitter amplifier circuit and the ground.

[0048] like Figure 2 As shown in , the first-stage amplifier circuit 201 includes: a common emitter amplifier circuit composed of a switch tube VT1 and two pull-up resistors, and a voltage-dividing resistor R11; the base and collector of the switch tube VT1 receive the output voltage VCC of a preset power supply through corresponding pull-up resistors respectively; the emitter of the switch tube VT1 is grounded through the voltage-dividing resistor R11; the base of the switch tube VT1 and the ground are respectively used as the input side electrodes of the first-stage amplifier circuit 201, and the voltage between the two is the input voltage Ui of the power transmission module 101; the collector of the switch tube VT1 and the ground are respectively used as the output side electrodes of the first-stage amplifier circuit 201. The second-stage amplifier circuit 202 includes: a common emitter amplifier circuit composed of a switch tube VT2 and two pull-up resistors, and a voltage-dividing resistor R12; the base and collector of the switch tube VT2 receive the output voltage VCC of a preset power supply through corresponding pull-up resistors respectively; the emitter of the switch tube VT2 is grounded through the voltage-dividing resistor R12; the base of the switch tube VT2 and the ground are respectively used as the input side electrodes of the second-stage amplifier circuit 202; the collector of the switch tube VT2 and the ground are respectively used as the output side electrodes of the second-stage amplifier circuit 202, and the voltage between the two is the output voltage Uo of the power transmission module 101.

[0049] It should be noted that the above two switching tubes VT1 and VT2 can use MOSFET (Metal Oxide Semiconductor Field Effect Transistor, Metal Oxide Semiconductor Field Effect Transistor, referred to as MOS tube), or triode, etc., which is not limited here and depends on the specific application environment. Various optional devices in the prior art are within the protection scope of this application.

[0050] At this time, the negative feedback module 102 includes: a first resistor R1; the first resistor R1 is arranged between the two sides of the power transmission module 101, specifically, between the emitter of the first-stage amplifier circuit 201 and the emitter of the second-stage amplifier circuit 202. The sum of the base-emitter voltage Ube1 of the switch tube VT1 and the voltage on the voltage-dividing resistor R11 is the input voltage Ui; the sum of the collector-emitter voltage Uce2 of the switch tube VT2 and the voltage on the voltage-dividing resistor R12 is the output voltage Uo.

[0051] The specific working principle of this circuit structure is:

[0052] The negative feedback module 102 leads feedback from the output side of the power transmission module 101 back to the emitter of the switch tube VT1, thereby introducing two-level feedback. When the instantaneous polarity of the input voltage Ui is positive with respect to the ground, that is, the base potential of the switch tube VT1 is positive with respect to the ground, since the first-stage amplifier circuit 201 adopts a common emitter amplifier circuit, and the output voltage of the common emitter amplifier circuit is inversely proportional to the input voltage, the collector potential of the switch tube VT1 is negative with respect to the ground, that is, the base potential of the switch tube VT2 is negative with respect to the ground; and the second-stage amplifier circuit 202 also adopts a common emitter amplifier circuit, so that the collector potential polarity of the switch tube VT2 is positive with respect to the ground; the current output from the emitter of the switch tube VT2 passes through the voltage-dividing resistor R12 in one way, passes through the first resistor R1 in the other way to the emitter of the switch tube VT1, and then passes through the voltage-dividing resistor R11 to the ground; the feedback voltage is obtained by dividing the first resistor R1 and the voltage-dividing resistor R11, and the voltage across the voltage-dividing resistor R11 is the feedback voltage Uf, thereby reducing the base-emitter voltage Ube1 of the switch tube VT1, thereby achieving the effect of negative feedback.

[0053] Assuming that the output voltage Uo increases, the voltage Ur12 on the voltage-dividing resistor R12 increases, so that the voltage Ur11 across the voltage-dividing resistor R11, that is, the feedback voltage Uf, increases, which reduces the base-emitter voltage Ube1 of the switch tube VT1, thereby reducing the collector output of the switch tube VT1, and finally reducing the output voltage Uo. Similarly, when the output voltage Uo decreases, the output voltage Uo can be increased through the above-mentioned negative feedback effect. Furthermore, through the above-mentioned negative feedback regulation, the purpose of stabilizing the output voltage Uo can be achieved; even if pulse interference occurs, the protection effect can be achieved through the above process.

[0054] The above embodiment takes two-stage amplification as an example to exemplify the specific structure of the power transmission module 101. In practical applications, the specific structure of the power transmission module 101 is not limited to this. For example, the power transmission module 101 can also adopt one-stage amplification, such as Figure 3 As shown in , the power transmission module 101 includes: a common emitter amplifier circuit.

[0055] The common emitter amplifier circuit mainly includes a switch tube VT3 and a corresponding pull-up resistor.

[0056] At this time, the negative feedback module 102 includes: a second resistor R2; the second resistor R2 is connected between the base and the collector of the common emitter amplifier circuit, that is, connected between the base and the collector of the switch tube VT3.

[0057] It should be noted that, due to the existence of the second resistor R2, the base pull-up resistor of the switch tube VT3 can be omitted.

[0058] The specific working principle of this circuit structure is:

[0059] Assuming that the base signal source of the switch tube VT3 is positive at a certain moment, since the output voltage and input voltage of the common emitter amplifier circuit are inversely proportional, the collector signal of the switch tube VT3 is negative; then, through the feedback element, that is, the second resistor R2, the negative feedback signal is added to the base of the switch tube VT3, and since it is opposite to the assumed polarity of the signal source, its voltage will be reduced; thus, it can be obtained that the role of the feedback element R2 is negative feedback regulation. The case where the base signal source of the switch tube VT3 is negative can be deduced by analogy, and will not be repeated.

[0060] It should be noted that if the output side of the common emitter amplifier circuit is short-circuited to the ground, and the collector of the switch tube VT3 is grounded through the capacitor C2, then no signal is fed back to the base of the switch tube VT3 through the negative feedback element R2, that is, there is no negative feedback signal in the circuit, so it can be obtained that the circuit structure belongs to a voltage negative feedback circuit. Moreover, since the circuit structure only uses a first-stage common emitter amplifier circuit, the two poles on the output side of the circuit structure need to be applied in reverse, that is, the positive pole on the output side of the common emitter amplifier circuit is connected to the negative pole on the output side of the power transmission module 101, and the positive pole on the output side of the common emitter amplifier circuit is connected to the negative pole on the output side of the power transmission module 101, to ensure that the required positive power supply voltage is provided to each subsequent electrical device or circuit.

[0061] In addition, it should be noted that when the power transmission module 101 uses an amplifier circuit, since it has a voltage amplification function, if the power supply voltage required by the subsequent electrical devices or circuits remains unchanged, for example, the power supply voltage can still be 3.3V, then the output voltage of the main circuit 20 in the auxiliary power supply can be adjusted to be lower than the required power supply voltage (for example, lower than 3.3V), and then the required power supply voltage (for example, 3.3V) is obtained through the voltage amplification function of the power transmission module 101. Moreover, the amplification gain of the power transmission module 101 can be set according to the value of the input voltage Ui and the need for the power supply voltage, which is not limited here.

[0062] In practical applications, the power transmission module 101 may also adopt other structures, or may not have the voltage amplification function, and accordingly, the rated output voltage of the main circuit 20 may be set according to actual needs. As long as a stable power supply voltage can be obtained through negative feedback regulation, various achievable circuit structures and corresponding parameter settings are within the protection scope of this application.

[0063] The above embodiments illustrate that when the output voltage Uo of the power transmission module 101 increases or decreases, the existence of negative feedback can suppress its change and achieve the purpose of voltage stabilization. Further analysis shows that since the output voltage Uo is obtained by amplifying the input voltage Ui of the power transmission module 101, the stability of the input voltage Ui and the amplification gain of the power transmission module 101 is particularly important.

[0064] Therefore, based on the above embodiments, this embodiment provides a voltage stabilizing circuit 10, which further adds a voltage stabilizing diode, which is arranged between the two poles of the output side of the preset power supply, such as Figure 2 The voltage stabilizing diode D shown in the figure is arranged between the positive electrode and the negative electrode (ie, the ground) of the output side of the preset power supply. The voltage stabilizing diode can ensure the stability of the output voltage VCC of the preset power supply.

[0065] In addition, in the voltage stabilizing circuit 10, the preset power supply can be implemented by a three-terminal voltage stabilizing circuit, that is, the voltage VCC can be generated by a three-terminal voltage stabilizing circuit to ensure the stability of the static operating point.

[0066] Furthermore, the voltage stabilizing circuit 10 may further include: two filter capacitors, one of which is disposed between two poles on the input side of the power transmission module 101, and the other filter capacitor is disposed between two poles on the output side of the power transmission module 101; Figure 2 The two filter capacitors are shown in Figure 1. The existence of the filter capacitor can filter out the tiny voltage fluctuations on this side, and at the same time, the change of the output voltage Uo can in turn suppress the change of the input voltage Ui.

[0067] Another embodiment of the present application also provides an auxiliary power supply system, which is as follows: Figure 1 As shown in , it includes: an auxiliary power supply and a voltage stabilizing circuit 10. The specific structure and working principle of the voltage stabilizing circuit 10 can be found in the above embodiment, and will not be described here one by one.

[0068] The voltage stabilizing circuit 10 can suppress the change of the power supply voltage and ensure the stability of the power supply voltage through the negative feedback regulation function.

[0069] The auxiliary power supply system provides a stable power supply voltage for subsequent electrical devices or circuits through the voltage stabilization function of the voltage stabilization circuit 10 for the output voltage of the main circuit 20 in the auxiliary power supply, and can achieve corresponding protection when pulse interference occurs.

[0070] The same and similar parts between the various embodiments in this specification can refer to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the system or system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can refer to the partial description of the method embodiment. The system and system embodiments described above are only schematic, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Ordinary technicians in this field can understand and implement it without paying creative work.

[0071] Professionals may further appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described in the above description according to function. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professionals and technicians may use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present utility model.

[0072] With respect to the above description of the disclosed embodiments, the features described in the embodiments in this specification may be replaced or combined with each other, so that professionals in the field can implement or use the present invention. Various modifications to these embodiments will be apparent to professionals in the field, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A voltage stabilizing circuit for an auxiliary power supply, characterized in that: include: Power transmission module and negative feedback module; wherein, The power transmission module is an active module, receiving power from a preset power source; The input side of the power transmission module is connected to the output side of the main circuit in the auxiliary power supply; The output side of the power transmission module provides a supply voltage; The input side of the negative feedback module is connected to the output side of the power transmission module; The output side of the negative feedback module is connected to the input side of the power transmission module.

2. The voltage stabilizing circuit of the auxiliary power supply according to claim 1, characterized in that: The power transmission module comprises: a first-stage amplification circuit and a second-stage amplification circuit; The first-stage amplifier circuit and the second-stage amplifier circuit both receive power from the preset power supply; The input side of the first-stage amplifier circuit serves as the input side of the power transmission module; The output side of the first-stage amplifier circuit is connected to the input side of the second-stage amplifier circuit; The output side of the second-stage amplifier circuit serves as the output side of the power transmission module.

3. The voltage stabilizing circuit of the auxiliary power supply according to claim 2, characterized in that: The first-stage amplifier circuit and the second-stage amplifier circuit both include: a common emitter amplifier circuit and a voltage-dividing resistor; The voltage dividing resistor is arranged between the emitter of the common emitter amplifier circuit and the ground.

4. The voltage stabilizing circuit of the auxiliary power supply according to claim 3, characterized in that: The negative feedback module comprises: a first resistor; The first resistor is arranged between the emitter of the first-stage amplifier circuit and the emitter of the second-stage amplifier circuit.

5. The voltage stabilizing circuit of the auxiliary power supply according to claim 1, characterized in that: The power transmission module includes: a common emitter amplifier circuit.

6. The voltage stabilizing circuit of the auxiliary power supply according to claim 5, characterized in that: The negative feedback module includes: a second resistor; the second resistor is connected between the base and the collector of the common emitter amplifier circuit.

7. The voltage stabilizing circuit of the auxiliary power supply according to any one of claims 1 to 6, characterized in that: Also includes: The voltage stabilizing diode is arranged between two poles of the output side of the preset power supply.

8. The voltage stabilizing circuit of the auxiliary power supply according to any one of claims 1 to 6, characterized in that: The preset power supply is: a three-terminal voltage stabilizing circuit.

9. The voltage stabilizing circuit of the auxiliary power supply according to any one of claims 1 to 6, characterized in that: Also includes: Two filter capacitors, one of which is arranged between two poles on the input side of the power transmission module, and the other of which is arranged between two poles on the output side of the power transmission module.

10. An auxiliary power supply system, characterized in that: include: An auxiliary power supply and a voltage stabilizing circuit for the auxiliary power supply as claimed in any one of claims 1 to 9.

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