Boost control circuit and power supply system

Abstract

The utility model discloses a control boost circuit and a power supply system. The control boost circuit comprises a switch module, a power supply module and a boost IC chip. The power supply module has a positive output end and a negative output end; the boost IC chip comprises a first pin, a second pin and a third pin used for outputting second voltage, the first pin is connected with the positive electrode output end of the power supply module, and the second pin is connected with the negative electrode output end of the power supply module through the switch module. According to the technical scheme of the utility model, when the switch module is in a closed state, the second pin of the boost IC chip is connected with the cathode output end of the power supply module; when the switch module is in the off state, the second pin of the boost IC chip is disconnected with the negative electrode output end of the power supply module, so that the second pin of the boost IC chip and the negative electrode output end of the power supply module are in an off state, the boost IC chip does not have standby current any more and is in a zero-power-consumption state, and the requirement of a power supply product requiring extremely low quiescent current is met.

Description

Technical Field

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

[0002] The boost IC chip is a commonly used control boost chip in a boost circuit, wherein the boost IC chip is usually controlled through a CE pin on the boost IC chip to reduce power consumption.

[0003] At present, although the boost IC chip can be controlled by the CE pin on the boost IC chip to reduce power consumption, the CE pin on the boost IC chip only controls the boost IC chip to enter a standby state. Since the second pin of the boost IC chip is still connected to the negative output terminal of the power supply module, there is still a standby current of about 1μA when the boost IC chip enters the standby state, so it cannot meet the requirements of power supply products with extremely small static current requirements.

[0004] Therefore, the prior art still needs to be improved and developed. Utility Model Content

[0005] In view of the above-mentioned deficiencies in the prior art, the purpose of the present utility model is to provide a control boost circuit and a power supply system to solve the problem that when the boost IC chip in the prior art enters the standby state, there is still a standby current of about 1μA, so it cannot meet the requirements of power supply products with extremely small static current requirements.

[0006] The utility model provides a control boost circuit, comprising:

[0007] Switch module;

[0008] A power supply module for outputting a first voltage, the power supply module having a positive output terminal and a negative output terminal;

[0009] A boost IC chip, the boost IC chip comprising a first pin, a second pin and a third pin for outputting a second voltage, the first pin of the boost IC chip being connected to the positive output terminal of the power supply module, and the second pin of the boost IC chip being connected to the negative output terminal of the power supply module via the switch module;

[0010] Wherein, when the switch module is in the disconnected state, the second pin of the boost IC chip is disconnected from the negative output terminal of the power supply module.

[0011] The further configuration of the utility model also includes:

[0012] A control module for controlling the state of the switch module, wherein the control module is connected to the switch module.

[0013] In a further configuration of the utility model, the switch module comprises: a first switch tube, a first resistor and a second resistor;

[0014] The second pin of the boost IC chip is connected to the negative output terminal of the power supply module via the first switch tube;

[0015] One end of the first resistor is connected to the first switch tube, and the other end of the first resistor is connected to the control module;

[0016] One end of the second resistor is connected to the other end of the first resistor, and the other end of the second resistor is grounded;

[0017] Wherein, when the first switch tube is in the off state, the second pin of the boost IC chip is disconnected from the negative output terminal of the power supply module.

[0018] In a further configuration of the utility model, the first switch tube includes a first MOS tube, the drain of the first MOS tube is connected to the second pin of the boost IC chip, the gate of the first MOS tube is connected to one end of the first resistor, and the source of the first MOS tube is connected to the negative output end of the power supply module;

[0019] Wherein, when the first MOS tube is in the disconnected state, the second pin of the boost IC chip is disconnected from the negative output terminal of the power supply module.

[0020] A further configuration of the utility model further includes: a first filtering module;

[0021] The positive output terminal of the power supply module is connected to the first pin of the boost IC chip via the first filter module.

[0022] In a further configuration of the utility model, the first filtering module includes: a first capacitor and a first inductor;

[0023] One end of the first capacitor is connected to the positive output end of the power supply module, and the other end of the first capacitor is connected to the negative output end of the power supply module;

[0024] One end of the first inductor is connected to one end of the first capacitor, and the other end of the first inductor is connected to the first pin of the boost IC chip.

[0025] According to a further configuration of the utility model, the control boost circuit further includes: a second filtering module;

[0026] The second filtering module is connected to the third pin of the boost IC chip.

[0027] In a further configuration of the utility model, the second filtering module includes: a second capacitor and a third capacitor;

[0028] One end of the second capacitor and one end of the third capacitor are connected to the third pin of the boost IC chip, and the other end of the second capacitor and the other end of the third capacitor are grounded.

[0029] The utility model also provides a power supply system using the control boost circuit as described above, the power supply system comprising: a boost module for converting a second voltage into a third voltage, the boost module comprising a voltage input terminal and a voltage output terminal, the voltage input terminal of the boost module being connected to the third pin of the boost IC chip.

[0030] In a further configuration of the utility model, the boost module includes: a second inductor, a first diode, a first load capacitor and a first switch;

[0031] One end of the second inductor is connected to the third pin of the boost IC chip;

[0032] The anode of the first diode is connected to the other end of the second inductor, and the cathode of the first diode is connected to one end of the first load capacitor;

[0033] One end of the first switch is connected to a connection path between the anode of the first diode and the other end of the second inductor, and the other end of the first switch and the other end of the first load capacitor are connected to ground.

[0034] The utility model has the beneficial effects:

[0035] The utility model provides a control boost circuit and a power supply system, the control boost circuit includes a switch module; a power supply module for outputting a first voltage, the power supply module has a positive output terminal and a negative output terminal; a boost IC chip, the boost IC chip includes a first pin, a second pin and a third pin for outputting a second voltage, the first pin of the boost IC chip is connected to the positive output terminal of the power supply module, the second pin of the boost IC chip is connected to the negative output terminal of the power supply module via the switch module; wherein, when the switch module is in an off state, the pin of the boost IC chip is disconnected from the negative output terminal of the power supply module. In the technical solution of the utility model, the second pin of the boost IC chip is connected to the negative output terminal of the power supply module via the switch module, and when the switch module is in an off state, the second pin of the boost IC chip is disconnected from the negative output terminal of the power supply module, so that the second pin of the boost IC chip and the negative output terminal of the power supply module are in an open circuit state, and there is no standby current on the boost IC chip, which is in a 0 power consumption state, meeting the requirements of power supply products with extremely small static current requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary personnel in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0037] Figure 1 It is a schematic diagram of the control boost circuit of the utility model.

[0038] Figure 2 The internal circuit diagram of the boost IC chip in the prior art of the utility model.

[0039] Figure 3 It is a circuit structure diagram of a boost module in one embodiment of the utility model.

[0040] The marks in the accompanying drawings are: 10, switch module; 101, first switch tube; 20, power supply module; 201, positive output terminal; 202, negative output terminal; 30, boost IC chip; 40, control module; 50, first filter module; 60, second filter module; 70, boost module; C1, first capacitor; C2, second capacitor; C3, third capacitor; Q1, first MOS tube; R1, first resistor; R2, second resistor; L1, first inductor; L2, second inductor; D1, first diode; K1, first switch; CL, first load capacitor. DETAILED DESCRIPTION

[0041] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific implementation methods of the present invention are now described in detail with reference to the accompanying drawings. In the following description, it should be understood that the directions or positional relationships indicated by "front", "back", "up", "down", "left", "right", "longitudinal", "horizontal", "vertical", "horizontal", "top", "bottom", "inside", "outside", "head", "tail", etc. are based on the directions or positional relationships shown in the accompanying drawings, are constructed and operated in a specific direction, and are only for the convenience of describing the present technical solution, rather than indicating that the device or element referred to must have a specific direction, and therefore cannot be understood as a limitation to the present invention.

[0042] like Figure 2As shown in the figure, it is an internal circuit structure diagram of a boost IC chip. When controlling the boost IC chip, the CE pin (Chip enable pin) on the boost IC chip is used to control it so as to reduce power consumption. Although the CE pin on the boost IC chip can control the boost IC chip so as to reduce power consumption, the CE pin on the boost IC chip only controls the boost IC chip to enter a standby state. Since the second pin of the boost IC chip is still connected to the negative output terminal of the power supply module, when the boost IC chip enters the standby state, there is still a standby current of about 1μA, so it cannot meet the requirements of power supply products with extremely small static current requirements.

[0043] In view of the above technical problems, the utility model provides a control boost circuit. Figure 1 As shown, the control boost circuit may include a switch module 10, a power supply module 20 and a boost IC (Integrated Circuit) chip; the switch module 10 includes a closed state and an open state; the power supply module 20 has a positive output terminal 201 and a negative output terminal 202, and the power supply module 20 is used to output a first voltage; the boost IC chip 30 includes a first pin, a second pin and a third pin for outputting a second voltage, the first pin of the boost IC chip 30 is connected to the positive output terminal 201 of the power supply module 20, and the second pin of the boost IC chip 30 is connected to the negative output terminal 202 of the power supply module 20 via the switch module 10; wherein, the first pin of the boost IC chip 30 is the LX pin (energy conversion pin) of the boost IC chip 30, the second pin of the boost IC chip 30 is the GND pin (ground pin), and the third pin of the boost IC chip 30 is the VOUT pin (output voltage pin).

[0044] In this embodiment, when the switch module 10 is in a closed state, the second pin of the boost IC chip 30 is connected to the negative output terminal 202 of the power supply module 20; when the switch module 10 is in an open state, the second pin of the boost IC chip 30 is disconnected from the negative output terminal 202 of the power supply module 20, so that the second pin of the boost IC chip 30 and the negative output terminal 202 of the power supply module 20 are in an open circuit state, and there is no standby current on the boost IC chip 30, which is in a zero power consumption state, meeting the requirements of power supply products with extremely small static current requirements.

[0045] In a specific embodiment, the boost IC chip 30 may be, but is not limited to, a chip of model ME2188A33X.

[0046] Furthermore, the control boost chip further includes a control module 40 , which is connected to the switch module 10 and is used to control the state of the switch module 10 .

[0047] Specifically, Figure 1As shown, the switch module 10 may include a first switch tube 101, a first resistor R1 and a second resistor R2; the second pin of the boost IC chip 30 is connected to the negative output terminal of the power supply module 20 via the first switch tube 101; one end of the first resistor R1 is connected to the first switch tube 101, and the other end of the first resistor R1 is connected to the control module 40; one end of the second resistor R2 is connected to the other end of the first resistor R1, and the other end of the second resistor R2 is grounded; wherein, when the first switch tube 101 is in the disconnected state, the second pin of the boost IC chip 30 is disconnected from the negative output terminal 202 of the power supply module 20.

[0048] In this embodiment, the state of the first switch tube 101 is controlled by the control module 40, and the state of the first switch tube 101 includes an open state and a closed state, wherein the open state of the first switch tube 101 is the open state of the switch module 10, and the closed state of the first switch tube 101 is the closed state of the switch module 10.

[0049] The control module 40 can be any single-chip microcomputer that can control the first switch tube 101. Those skilled in the art can determine the specific model of the single-chip microcomputer according to actual needs, and no further limitation is made here. Among them, when the second pin of the boost IC chip 30 and the negative output terminal of the power supply module 20 are in an open circuit state, the internal diode of the boost IC chip 30 can continue to supply power to the single-chip microcomputer, so that the single-chip microcomputer can continue to work when the second pin of the boost IC chip 30 and the negative output terminal of the power supply module 20 are in an open circuit state.

[0050] In some embodiments, Figure 1 As shown, the first switch tube 101 may include a first MOS tube Q1 (MOSFET, metal-oxide semiconductor field effect transistor), the drain of the first MOS tube Q1 is connected to the second pin of the boost IC chip 30, the gate of the first MOS tube Q1 is connected to one end of the first resistor R1, and the source of the first MOS tube Q1 is connected to the negative output terminal 202 of the power supply module 20; wherein, when the first MOS tube Q1 is in the disconnected state, the second pin of the boost IC chip 30 is disconnected from the negative output terminal 202 of the power supply module 20.

[0051] In this embodiment, the first MOS tube Q1 may be, but is not limited to, an NPN MOS tube of model SI2302. When the control module 40 controls the first switch tube 101, the control signal is input to the first MOS tube Q1 via the first resistor R1. The setting of the first resistor R1 prevents the current from breaking through the first MOS tube Q1, thereby protecting the first MOS tube Q1. Furthermore, the setting of the second resistor R2 provides a bias voltage for the first MOS tube Q1, thereby ensuring the normal on and off of the first MOS tube Q1.

[0052] In some embodiments, Figure 1 As shown, the control boost circuit further includes a first filtering module 50 ; wherein the positive output terminal of the power supply module 20 is connected to the first pin of the boost IC chip 30 via the first filtering module 50 .

[0053] Specifically, the first filtering module 50 may include a first capacitor C1 and a first inductor L1; one end of the first capacitor C1 is connected to the positive output end of the power supply module 20, and the other end of the first capacitor C1 is connected to the negative output end of the power supply module 20; one end of the first inductor L1 is connected to one end of the first capacitor C1, and the other end of the first inductor L1 is connected to the first pin of the boost IC chip 30.

[0054] In this embodiment, the voltage outputted from the power supply module 20 to the boost IC chip 30 is first filtered by the first filter module 50 and then outputted to the boost IC chip 30 , thereby filtering out interference signals and clutter in the voltage outputted from the power supply module 20 .

[0055] In some embodiments, Figure 1 As shown, the control boost circuit further includes a second filter module 60 ; the second filter module 60 is connected to the third pin of the boost IC chip 30 .

[0056] Specifically, the second filtering module 60 may include a second capacitor C2 and a third capacitor C3; wherein one end of the second capacitor C2 and one end of the third capacitor C3 are connected to the third pin of the boost IC chip 30, and the other end of the second capacitor C2 and the other end of the third capacitor C3 are grounded.

[0057] In this embodiment, when the third pin of the boost IC chip 30 outputs the second voltage to the outside, for example, the third pin of the boost IC chip 30 is connected to the boost module 70, and the second voltage is first filtered by the second filter module 60 and then output to the boost module 70, thereby filtering out interference signals and clutter in the second voltage output from the third pin of the boost IC chip 30.

[0058] In this embodiment, the power supply module 20 may be a battery.

[0059] In some embodiments, the utility model further provides a power supply system using the control boost circuit as described above, wherein: Figure 3 As shown, the power supply system may include a boost module 70 for converting the second voltage into a third voltage. The boost module 70 may include a voltage input terminal and a voltage output terminal. The voltage input terminal of the boost module 70 is connected to the third pin of the boost IC chip 30.

[0060] In this embodiment, the boost module 70 may include a second inductor L2, a first diode D1, a first load capacitor CL and a first switch K1; one end of the second inductor L2 (one end of the second inductor L2 is the voltage input end of the boost module 70) is connected to the lower 3rd pin of the boost IC chip 30, specifically, one end of the second inductor L2 is connected to the second capacitor C2 and the third capacitor C3 are connected to one end of the 3rd pin of the boost IC chip 30; the anode of the first diode D1 is connected to the other end of the second inductor L2, and the cathode of the first diode D1 is connected to one end of the first load capacitor CL (the cathode of the first diode D1 is connected to the first load capacitor CL The end is the voltage output end of the boost module 70); one end of the first switch K1 is connected to the connection path between the anode of the first diode D1 and the other end of the second inductor L2, and the other end of the first switch K1 is connected to the other end of the first load capacitor CL and then grounded.

[0061] When the first switch K1 is closed, the second inductor L2 is in a charging state, and the first load capacitor CL is discharged to output a third voltage; when the first switch K1 is opened, the second inductor L2 is in a discharging state, and the voltage output by the second inductor L2 is divided into two paths at the cathode of the first diode D1, one of which charges the first load capacitor CL, and the other is output to the outside (i.e., the third voltage). For example, the other path (the third voltage) can be output to a load.

[0062] Here, it should be noted that the boost module 70 can also be any circuit structure that can convert the second voltage into the third voltage, and those skilled in the art can determine the specific circuit structure of the boost module 70 according to actual needs.

[0063] In summary, the utility model provides a control boost circuit and a power supply system, which have the following beneficial effects:

[0064] When the switch module 10 is in a closed state, the second pin of the boost IC chip 30 is connected to the negative output terminal 202 of the power supply module 20; when the switch module 10 is in an open state, the second pin of the boost IC chip 30 is disconnected from the negative output terminal 202 of the power supply module 20, so that the second pin of the boost IC chip 30 and the negative output terminal 202 of the power supply module 20 are in an open circuit state, and there is no standby current on the boost IC chip 30, which is in a zero power consumption state, meeting the requirements of power supply products with extremely small static current requirements.

[0065] It can be understood that the above embodiments only express the preferred implementation methods of the utility model, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the patent scope of the utility model. It should be pointed out that, for ordinary technicians in this field, without departing from the concept of the utility model, the above-mentioned technical features can be freely combined, and several deformations and improvements can be made, which all belong to the protection scope of the utility model. Therefore, all equivalent changes and modifications made to the scope of the claims of the utility model should belong to the scope covered by the claims of the utility model.

Claims

1. A control boost circuit, characterized in that: include: Switch module; A power supply module for outputting a first voltage, the power supply module having a positive output terminal and a negative output terminal; A boost IC chip, the boost IC chip comprising a first pin, a second pin and a third pin for outputting a second voltage, the first pin of the boost IC chip being connected to the positive output terminal of the power supply module, and the second pin of the boost IC chip being connected to the negative output terminal of the power supply module via the switch module; Wherein, when the switch module is in the disconnected state, the second pin of the boost IC chip is disconnected from the negative output terminal of the power supply module.

2. The control boost circuit according to claim 1, characterized in that: Also includes: A control module for controlling the state of the switch module, wherein the control module is connected to the switch module.

3. The control boost circuit according to claim 2, characterized in that: The switch module includes: a first switch tube, a first resistor and a second resistor; The second pin of the boost IC chip is connected to the negative output terminal of the power supply module via the first switch tube; One end of the first resistor is connected to the first switch tube, and the other end of the first resistor is connected to the control module; One end of the second resistor is connected to the other end of the first resistor, and the other end of the second resistor is grounded; Wherein, when the first switch tube is in the off state, the second pin of the boost IC chip is disconnected from the negative output terminal of the power supply module.

4. The control boost circuit according to claim 3, characterized in that: The first switch tube includes a first MOS tube, the drain of the first MOS tube is connected to the second pin of the boost IC chip, the gate of the first MOS tube is connected to one end of the first resistor, and the source of the first MOS tube is connected to the negative output end of the power supply module; Wherein, when the first MOS tube is in the disconnected state, the second pin of the boost IC chip is disconnected from the negative output terminal of the power supply module.

5. The control boost circuit according to claim 1, characterized in that: Also includes: A first filtering module; The positive output terminal of the power supply module is connected to the first pin of the boost IC chip via the first filter module.

6. The control boost circuit according to claim 5, characterized in that: The first filtering module includes: a first capacitor and a first inductor; One end of the first capacitor is connected to the positive output end of the power supply module, and the other end of the first capacitor is connected to the negative output end of the power supply module; One end of the first inductor is connected to one end of the first capacitor, and the other end of the first inductor is connected to the first pin of the boost IC chip.

7. The control boost circuit according to claim 1 or 6, characterized in that: The control boost circuit further includes: a second filtering module; The second filtering module is connected to the third pin of the boost IC chip.

8. The control boost circuit according to claim 7, characterized in that: The second filtering module includes: a second capacitor and a third capacitor; One end of the second capacitor and one end of the third capacitor are connected to the third pin of the boost IC chip, and the other end of the second capacitor and the other end of the third capacitor are grounded.

9. A power supply system using the control boost circuit according to any one of claims 1 to 8, characterized in that: The power supply system includes: a boost module for converting the second voltage into a third voltage, the boost module includes a voltage input end and a voltage output end, and the voltage input end of the boost module is connected to the third pin of the boost IC chip.

10. The power supply system according to claim 9, characterized in that: The boost module includes: a second inductor, a first diode, a first load capacitor and a first switch; One end of the second inductor is connected to the third pin of the boost IC chip; The anode of the first diode is connected to the other end of the second inductor, and the cathode of the first diode is connected to one end of the first load capacitor; One end of the first switch is connected to a connection path between the anode of the first diode and the other end of the second inductor, and the other end of the first switch and the other end of the first load capacitor are connected to ground.

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