Power supply control device and circuit breaker system

Abstract

The utility model provides a power supply control device and a circuit breaker system, and belongs to the technical field of power supply control. The power supply control device comprises a power supply selection circuit, a power supply control chip and a hysteresis circuit, wherein the hysteresis circuit comprises a voltage monitor; the input end of the power supply selection circuit is used for being connected with a power supply, the output end of the power supply selection circuit is connected with the input end of the power supply control chip, the output end of the power supply selection circuit is further connected with the input end of the hysteresis circuit, the output end of the hysteresis circuit is connected with the enabling end of the power supply control chip, and the output end of the power supply control chip is externally connected with a load. The voltage monitor is used for monitoring the power supply voltage input by the power supply selection circuit to the power supply control chip, and controlling the input level of the enabling end of the power supply control chip according to the power supply voltage, a preset voltage upper limit value and a preset voltage lower limit value. According to the invention, the structure of the hysteresis circuit can be simplified, the cost of the hysteresis circuit is reduced, and the hysteresis voltage of the hysteresis circuit is flexible and adjustable.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power supply control, in particular to a power supply control device and a circuit breaker system. BACKGROUND

[0002] The frame and molded case circuit breaker can be powered by an external auxiliary power supply or a fast saturation mutual inductor, wherein the external auxiliary power supply can provide sufficient and stable power, which will not cause the enable pin input voltage of the power supply control chip to be unstable, thereby causing the load power supply voltage to be unstable. However, when the fast saturation mutual inductor is in low energy power supply, it will cause the enable pin input voltage of the power supply control chip to be unstable, thereby causing the power supply control chip to start and shut down repeatedly, resulting in the load power supply voltage to be intermittent, which seriously affects the functional reliability of the product.

[0003] In related technologies, a hysteresis circuit is generally built by introducing positive feedback through an operational amplifier or a comparator, and the enable pin input voltage of the power supply control chip is controlled through the hysteresis circuit, so that the power supply control chip can also provide stable power supply voltage for the load under the power supply of the fast saturation mutual inductor. The hysteresis voltage difference of the hysteresis circuit can effectively prevent the power supply control chip from starting and shutting down repeatedly under the low energy power supply of the fast saturation mutual inductor, thereby making the load power supply voltage intermittent.

[0004] However, the related technology has the problems of more electronic devices, complex structure, high cost, and narrow range of hysteresis voltage required by the hysteresis circuit built by introducing positive feedback through an operational amplifier or a comparator. Content of the utility model

[0005] The purpose of the present application is to provide a power supply control device and a circuit breaker system, which can simplify the structure of the hysteresis circuit, reduce the cost of the hysteresis circuit, and flexibly adjust the hysteresis voltage of the hysteresis circuit.

[0006] Embodiments of the present application are implemented as follows:

[0007] In a first aspect, the present application provides a power supply control device, which comprises a power supply selection circuit, a power supply control chip, and a hysteresis circuit, wherein the hysteresis circuit comprises a voltage monitor.

[0008] The input end of the power supply selection circuit is used to access the power supply voltage, the output end of the power supply selection circuit is connected with the input end of the power supply control chip, and the output end of the power supply selection circuit is also connected with the input end of the hysteresis circuit. The output end of the hysteresis circuit is connected with the enable end of the power supply control chip, and the output end of the power supply control chip is connected with the load.

[0009] The voltage monitor is used for monitoring a supply voltage of a power supply selection circuit inputting a power supply control chip, and controlling an input level of an enable end of the power supply control chip according to the supply voltage, a preset upper voltage limit value and a preset lower voltage limit value, so as to make the power supply control chip turn on or turn off the connection with the load.

[0010] As an optional implementation, the hysteresis circuit further comprises a first voltage dividing unit and a second voltage dividing unit.

[0011] The first end of the first voltage dividing unit is connected with the output end of the power supply selection circuit and the input end of the power supply control chip respectively, the second end of the first voltage dividing unit is connected with one end of the second voltage dividing unit, the other end of the second voltage dividing unit and the output end of the voltage monitor are both connected with the enable end of the power supply control chip, the third end of the first voltage dividing unit is connected with the input end of the voltage monitor, and the fourth end of the first voltage dividing unit and the ground end of the voltage monitor are both grounded.

[0012] As an optional implementation, the first voltage dividing unit comprises a first resistor, a second resistor and a third resistor.

[0013] One end of the first resistor is connected with the output end of the power supply selection circuit and the input end of the power supply control chip respectively, the other end of the first resistor is connected with one end of the second resistor and one end of the second voltage dividing unit respectively, the other end of the second resistor is connected with one end of the third resistor and the input end of the voltage monitor respectively, and the other end of the third resistor is grounded.

[0014] As an optional implementation, the second voltage dividing unit comprises a fourth resistor.

[0015] One end of the fourth resistor is connected with the other end of the first resistor and one end of the second resistor respectively, and the other end of the fourth resistor and the output end of the voltage monitor are both connected with the enable end of the power supply control chip.

[0016] As an optional implementation, the voltage monitor is specifically used for monitoring the supply voltage, inputting a high level to the enable end of the power supply control chip when the supply voltage reaches the preset upper voltage limit value, and inputting a low level to the enable end of the power supply control chip when the supply voltage reaches the preset lower voltage limit value.

[0017] As an optional implementation, the hysteresis circuit further comprises a flip unit.

[0018] The other end of the fourth resistor and the output end of the voltage monitor are both connected with the enable end of the power supply control chip through the flip unit, and the flip unit is further connected with the input end of the power supply control chip.

[0019] As an optional implementation, the flip unit comprises an N-type metal oxide semiconductor transistor and a fifth resistor.

[0020] The gate of the N-type metal-oxide-semiconductor transistor is connected to the output terminal of the voltage monitor and the other end of the fifth resistor, respectively. The source of the N-type metal-oxide-semiconductor transistor is grounded. The drain of the N-type metal-oxide-semiconductor transistor and one end of the fifth resistor are both connected to the enable terminal of the power control chip. The other end of the fifth resistor is connected to the input terminal of the power control chip.

[0021] As an optional implementation, the voltage monitor is specifically used to: monitor the supply voltage, and when the supply voltage reaches a preset upper voltage limit, output a low level to the N-type metal-oxide-semiconductor transistor to turn on the N-type metal-oxide-semiconductor transistor, and the N-type metal-oxide-semiconductor transistor and the fifth resistor pull the input level of the enable terminal of the power control chip down to a low level; and when the supply voltage reaches a preset lower voltage limit, output a high level to the N-type metal-oxide-semiconductor transistor to turn off the N-type metal-oxide-semiconductor transistor, and the fifth resistor pulls the input level of the enable terminal of the power control chip up to a high level.

[0022] As an optional implementation, the voltage monitor is a monitoring chip.

[0023] A second aspect of this application provides a circuit breaker system, which includes: the power control device and the power supply module described in the first aspect above. The power supply module includes: an external auxiliary power supply unit and a fast-saturation power supply unit, and the output terminal of the power supply module is connected to the input terminal of the power control device.

[0024] The beneficial effects of the embodiments of this application include:

[0025] This application provides a power control device, comprising a power selection circuit, a power control chip, and a hysteresis circuit. The hysteresis circuit includes a voltage monitor. The input terminal of the power selection circuit is connected to an external power supply voltage. The output terminal of the power selection circuit is connected to both the input terminal of the power control chip and the input terminal of the hysteresis circuit. The output terminal of the hysteresis circuit is connected to the enable terminal of the power control chip. The output terminal of the power control chip is connected to an external load. The voltage monitor continuously monitors the power supply voltage input to the power control chip from the power selection circuit. Based on the power supply voltage, a preset upper voltage limit, and a preset lower voltage limit, the voltage monitor controls the input level of the enable terminal of the power control chip, causing the power control chip to turn on or off the connection to the load. Furthermore, this application implements a power supply voltage monitoring and judgment algorithm through the voltage monitor in the hysteresis circuit. This simplifies the hysteresis circuit structure, reduces its cost, and provides flexible and adjustable hysteresis voltage. Attached Figure Description

[0026] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of an existing hysteresis circuit.

[0028] Figure 2 A schematic diagram of another existing hysteresis circuit;

[0029] Figure 3 This is a schematic diagram of the structure of the first power control device provided in the embodiments of this application;

[0030] Figure 4 This is a schematic diagram of the structure of the second power control device provided in the embodiments of this application;

[0031] Figure 5 This is a schematic diagram of the structure of a third power control device provided in the embodiments of this application;

[0032] Figure 6 A control logic diagram of a voltage controller provided in an embodiment of this application;

[0033] Figure 7 This is a schematic diagram of the structure of the fourth power control device provided in the embodiments of this application;

[0034] Figure 8 This is a schematic diagram of the structure of the fifth power control device provided in the embodiments of this application;

[0035] Figure 9 Another control logic diagram of a voltage controller provided in this application embodiment;

[0036] Figure 10 This is a schematic diagram of the structure of the sixth power control device provided in the embodiments of this application;

[0037] Figure 11 This is a schematic diagram of the structure of the seventh power control device provided in the embodiments of this application;

[0038] Figure 12 This is a schematic diagram of the structure of a circuit breaker system provided in an embodiment of this application.

[0039] Figure descriptions: 10: Power control device; 101: Power selection circuit; 102: Power control chip; 103: Hysteresis circuit; 1031: Voltage monitor; 1032: First voltage divider unit; 321: First resistor; 322: Second resistor; 323: Third resistor; 1033: Second voltage divider unit; 331: Fourth resistor; 1034: Switching unit; 341: N-type metal-oxide-semiconductor transistor; 342: Fifth resistor; 30: Power supply module; 301: Fast saturation power supply unit; 302: External auxiliary power supply unit. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0041] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0042] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0043] In the description of this application, it should be noted that the terms "first," "second," "third," etc., are used only for distinguishing descriptions and should not be construed as indicating or implying relative importance. It should also be noted that, unless otherwise expressly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0044] Currently, a hysteresis circuit is often constructed by introducing positive feedback through operational amplifiers or comparators. This hysteresis circuit controls the input voltage to the enable pin of the power control chip, enabling the power control chip to provide a stable supply voltage to the load even when powered by a fast-saturating transformer. The hysteresis voltage difference effectively prevents the power control chip from repeatedly starting and stopping under the low-energy supply of the fast-saturating transformer, thus avoiding intermittent supply voltage to the load. However, this approach suffers from drawbacks: the hysteresis circuit built with positive feedback using operational amplifiers or comparators requires numerous electronic components, resulting in a complex structure and high cost. Furthermore, this approach also suffers from a narrow hysteresis voltage range.

[0045] To address this, this application provides a power control device that utilizes a voltage monitor to construct a hysteresis circuit. The voltage monitor continuously monitors the supply voltage from the power selection circuit to the power control chip and controls the input level of the enable terminal of the power control chip based on preset upper and lower voltage limits, thereby enabling or disabling the connection between the power control chip and the external load. The hysteresis circuit also includes a voltage divider unit, which widens the range of the hysteresis voltage. This simplifies the hysteresis circuit structure, reduces its cost, and provides flexible adjustment of the hysteresis voltage.

[0046] Figure 1 Here is a schematic diagram of an existing hysteresis circuit. (See attached diagram) Figure 1 An existing hysteresis circuit consists of a battery Vdc, resistors R1, R2, R3, and R4, transistors Q1 and Q2, and a Zener diode ZD1. This hysteresis circuit can implement high-level and low-level output circuits. The high-level output circuit outputs a voltage greater than the reference voltage to the voltage feedback pin to control the power control chip U1 to turn off when the DC power supply voltage is less than the startup voltage or when the DC power supply voltage is less than the shutdown voltage after the power control chip has started. The low-level output circuit outputs a voltage less than the reference voltage to the voltage feedback pin to control the power control chip U1 to start when the DC power supply voltage is greater than the startup voltage. The high-level output circuit includes transistor Q1; the low-level output circuit includes Zener diode ZD1, transistor Q2, resistors R2, R3, and R4.

[0047] Figure 2 For a schematic diagram of another existing hysteresis circuit, see [link / reference]. Figure 2Another existing hysteresis circuit consists of an electrolytic capacitor E1, transistors VT3 and VT4, resistors R6 and R5, a comparator U1, resistors R12 and R13, and a capacitor C2. It achieves fast start control and energy storage of the circuit breaker through a hysteresis voltage comparator circuit, an energy storage circuit, and a reference source circuit. This hysteresis voltage comparator circuit is a hysteresis circuit built based on positive feedback introduced by the comparator. This hysteresis circuit requires multiple electronic components such as resistors, capacitors, and transistors, and its circuit structure is complex.

[0048] The power control device and circuit breaker system provided in the embodiments of this application will be explained in detail below with reference to the accompanying drawings.

[0049] It is worth noting that the power control device provided in this application is mainly used to address the problem of voltage instability when powered by a fast-saturation transformer. When the power supply from the fast-saturation transformer is in a low-energy unstable state, the power control device can control the level of the enable terminal of the power control chip, causing the power control chip to shut down when the power supply is unstable, thereby ensuring stable operation of the external load under the power supply of the fast-saturation transformer. However, this does not mean that the power control device cannot be applied to other power supplies, and this application does not specifically limit it in this regard.

[0050] Figure 3 A schematic diagram of a power control device provided in this application is shown below. Figure 3 This application provides a power control device 10 including: a power selection circuit 101, a power control chip 102, and a hysteresis circuit 103. The hysteresis circuit 103 includes: a voltage monitor 1031.

[0051] Optionally, the power selection circuit 101 selects the power supply circuit of the power control device 10 and connects the external power supply voltage provided by the selected power supply circuit to the power control device 10, transmitting it to the power control chip 102. The voltage monitor 1031 in the hysteresis circuit 103 monitors the power supply voltage at the input terminal of the power control chip 102 in real time. When the power supply voltage connected to the power control chip 102 is unstable, the voltage monitor 1031 applies a corresponding level to the enable terminal of the power control chip 102, causing the power control chip 102 to disconnect from the external load. Specifically, when the power supply voltage input to the power control chip 102 is stable, the input level applied by the voltage monitor 1031 to the enable terminal of the power control chip 102 turns the power control chip 102 on, and the power control chip 102 supplies power to the external load; when the power supply voltage input to the power control chip 102 is unstable, the input level applied by the voltage monitor 1031 to the enable terminal of the power control chip 102 turns the power control chip 102 off, and the power control chip 102 no longer supplies power to the external load.

[0052] Optionally, the power control chip 102 is used to provide power to the external load under the action of the external supply voltage. The external load is often a circuit breaker, but this does not mean that the external load can only be a circuit breaker. This application does not make a specific limitation in this regard.

[0053] The input terminal of the power selection circuit 101 is used to connect to the power supply voltage. The output terminal of the power selection circuit 101 is connected to the input terminal of the power control chip 102. The output terminal of the power selection circuit 101 is also connected to the input terminal of the hysteresis circuit 103. The output terminal of the hysteresis circuit 103 is connected to the enable terminal of the power control chip 102. The output terminal of the power control chip 102 is connected to an external load.

[0054] Optionally, the power control device 10 selects the power supply circuit via the power selection circuit 101 to obtain the external power supply voltage, and transmits the received power supply voltage to the power control chip 102 via the output terminal of the power selection circuit 101. At the same time, the hysteresis circuit 103 obtains the current power supply voltage of the power control chip 102 via the output terminal of the power selection circuit 101. The hysteresis circuit 103 outputs a corresponding level to the enable terminal of the power control chip 102 according to the power supply voltage judgment result. The power control chip 102 is turned on or off under the action of the level.

[0055] The voltage monitor 1031 is used to monitor the power supply voltage of the power selection circuit 101 input power control chip 102, and according to the power supply voltage, the preset upper voltage limit and the preset lower voltage limit, control the input level of the enable terminal of the power control chip 102 so that the power control chip 102 is turned on or off from the load.

[0056] Optionally, the hysteresis circuit 103 presets an upper and lower voltage limit based on the power supply characteristics of the fast-saturation transformer, and the power supply voltage provided by the fast-saturation transformer changes in real time. Specifically, when the power supply voltage provided by the fast-saturation transformer changes from low to high, the power supply voltage input to the power control chip 102 of the power selection circuit 101 is higher than the preset upper voltage limit, indicating that the fast-saturation transformer is supplying stable power, and the level applied to the enable terminal of the power control chip 102 causes the power control chip 102 to conduct; when the power supply voltage provided by the fast-saturation transformer changes from high to low, the power supply voltage input to the power control chip 102 of the power selection circuit 101 is lower than the preset lower voltage limit, indicating that the fast-saturation transformer is supplying low energy, and the level applied to the enable terminal of the power control chip 102 causes the power control chip 102 to turn off.

[0057] It is worth noting that the power control chip in the power control device 10 provided in this application only turns on the power selection circuit 101 to supply power to the external load when the power supply voltage provided by the power selection circuit 101 is stable. When the power supply voltage provided by the power selection circuit 101 is unstable, the power control chip turns off and the power control device 10 does not supply power to the external load.

[0058] In this embodiment, the power control device includes a power selection circuit, a power control chip, and a hysteresis circuit. The hysteresis circuit includes a voltage monitor. The power selection circuit selects the power supply circuit for the power control device and connects the selected power supply voltage to the power control device. The output of the power selection circuit is connected to the input of the power control chip and the input of the hysteresis circuit. The output of the hysteresis circuit is connected to the enable terminal of the power control chip. The output of the power control chip is connected to an external load. The voltage monitor continuously monitors the power supply voltage input to the power control chip from the power selection circuit. Based on the power supply voltage, a preset upper voltage limit, and a preset lower voltage limit, the voltage monitor controls the input level of the enable terminal of the power control chip, causing the power control chip to turn on or off the connection to the load. Furthermore, this application implements a power supply voltage monitoring and judgment algorithm through the voltage monitor in the hysteresis circuit. This simplifies the hysteresis circuit structure, reduces its cost, and provides flexible and adjustable hysteresis voltage.

[0059] In one alternative implementation, see [link to implementation details]. Figure 4 The hysteresis circuit 103 in the power control device 10 provided in this application embodiment further includes: a first voltage divider unit 1032 and a second voltage divider unit 1033.

[0060] Optionally, the hysteresis circuit 103 provides a wider range of hysteresis voltages through the first voltage divider unit 1032 and the second voltage divider unit 1033.

[0061] The first terminal of the first voltage divider unit 1032 is connected to the output terminal of the power selection circuit 101 and the input terminal of the power control chip 102, respectively. The second terminal of the first voltage divider unit 1032 is connected to one terminal of the second voltage divider unit 1033. The other terminal of the second voltage divider unit 1033 and the output terminal of the voltage monitor 1031 are both connected to the enable terminal of the power control chip 102. The third terminal of the first voltage divider unit 1032 is connected to the input terminal of the voltage monitor 1031. The fourth terminal of the first voltage divider unit 1032 and the ground terminal of the voltage monitor 1031 are both grounded.

[0062] Optionally, both the first voltage divider unit 1032 and the second voltage divider unit 1033 are implemented by voltage divider circuits. The first voltage divider unit 1032 and the second voltage divider unit 1033 are connected in parallel. The voltage monitor 1031 sets the lower voltage threshold of 1032 based on the voltage detection threshold and voltage detection variable of the voltage monitor 1031 and the first voltage divider unit 1033. The voltage monitor 1031 sets the upper voltage threshold based on the voltage detection threshold and voltage detection variable of the voltage monitor 1031, the first voltage divider unit 1032 and the second voltage divider unit 1033.

[0063] In one alternative implementation, see [link to implementation details]. Figure 5 The first voltage divider unit 1032 in the hysteresis circuit 103 of the power control device 10 provided in this application embodiment includes: a first resistor 321, a second resistor 322 and a third resistor 323, and the second voltage divider unit 1033 in the hysteresis circuit 103 includes: a fourth resistor 331.

[0064] Optionally, the first voltage divider unit 1032 is a voltage divider circuit composed of a first resistor 321, a second resistor 322 and a third resistor 323, and the second voltage divider unit 1033 is a voltage divider circuit composed of a fourth resistor 331.

[0065] Optionally, the monitoring threshold of the voltage monitor 1031 can be calculated according to the following formula (1). The voltage monitoring threshold of the voltage monitor 1031 can be obtained from the voltage monitoring manual of the voltage monitor 1031. Formula (1) is as follows:

[0066] v scn =v detector-threshold -v detector-threshold-hysteresis (1)

[0067] Optionally, v sen The voltage monitoring threshold used to represent the voltage monitoring threshold of voltage monitor 1031, v detector-threshold Used to represent the voltage detection threshold of voltage monitor 1031, v detector-threshold-hysteresis Used to represent the voltage detection threshold variable of voltage monitor 1031.

[0068] Optionally, the voltage monitoring threshold of voltage monitor 1031 is determined based on the voltage difference between the voltage detection threshold of voltage monitor 1031 and the voltage detection threshold variable. It is worth noting that the voltage monitoring threshold of voltage monitor 1031 refers to the voltage between the second resistor 322 and the third resistor 323.

[0069] One end of the first resistor 321 is connected to the output terminal of the power selection circuit 101 and the input terminal of the power control chip 102, respectively. The other end of the first resistor 321 is connected to one end of the second resistor 322 and one end of the second voltage divider unit 1033, respectively. The other end of the second resistor 322 is connected to one end of the third resistor 323 and the input terminal of the voltage monitor 1031, respectively. The other end of the third resistor 323 is grounded.

[0070] Optionally, a preset lower voltage limit can be determined based on the voltage monitoring threshold of the voltage monitor 1031, the first resistor 321, the second resistor 322, and the third resistor 323. The lower voltage limit is set according to the following formula (2):

[0071]

[0072] Optionally, v inL Used to indicate the preset lower voltage limit, v sen R1 is used to represent the voltage monitoring threshold of the voltage monitor 1031, R2 is used to represent the resistance value of the first resistor 321, R3 is used to represent the resistance value of the second resistor 322, and R3 is used to represent the resistance value of the third resistor 323.

[0073] Optionally, a lower voltage limit is set based on the voltage monitoring threshold of the voltage monitor 1031 and the resistance values ​​of the first resistor 321, the second resistor 322, and the third resistor 323 in the first voltage divider unit 1032. Based on the set lower voltage limit, it can be determined whether the power supply voltage provided by the power supply circuit selected by the power selection circuit 101 is a low-energy and unstable power supply voltage.

[0074] One end of the fourth resistor 331 is connected to the other end of the first resistor 321 and one end of the second resistor 322, respectively. The other end of the fourth resistor 331 and the output terminal of the voltage monitor 1031 are both connected to the enable terminal of the power control chip 102.

[0075] Optionally, the equivalent resistance of the hysteresis circuit 103 is determined based on the first resistor 321, the second resistor 322, the third resistor 323 in the first voltage divider unit 1032, and the fourth resistor 331 in the second voltage divider unit 1033. The equivalent resistance of the hysteresis circuit 103 is calculated according to the following formula (3):

[0076]

[0077] Optionally, R is used to represent the equivalent resistance value of the hysteresis circuit 103, R1 is used to represent the resistance value of the first resistor 321, R2 is used to represent the resistance value of the second resistor 322, R3 is used to represent the resistance value of the third resistor 323, and R4 is used to represent the resistance value of the fourth resistor 331.

[0078] Optionally, the voltage monitor 1031 calculates the equivalent resistance value of the hysteresis circuit 103 based on the resistance values ​​of the first resistor 321, the second resistor 322, the third resistor 323 in the first voltage divider unit 1032 of the hysteresis circuit 103, and the resistance value of the fourth resistor 331 in the second voltage divider unit 1033.

[0079] Optionally, the voltage detection coefficient of the hysteresis circuit 103 is determined based on the second resistor 322 and the third resistor 323 in the first voltage divider unit 1032 and the fourth resistor 331 in the second voltage divider unit 1033. The voltage detection coefficient of the hysteresis circuit 103 is calculated according to the following formula (4):

[0080]

[0081] Optionally, X represents the voltage detection coefficient of the hysteresis circuit 103, R2 represents the resistance value of the second resistor 322, R3 represents the resistance value of the third resistor 323, and R4 represents the resistance value of the fourth resistor 331.

[0082] Optionally, the voltage detection coefficient of the hysteresis circuit 103 can be calculated based on the resistance values ​​of the second resistor 322 and the third resistor 323 in the first voltage divider unit 1032 of the hysteresis circuit 103, and the resistance value of the fourth resistor 331 in the second voltage divider unit 1033.

[0083] Optionally, based on the voltage monitoring threshold of the voltage monitor 1031, the first resistor 321, the second resistor 322, the third resistor 323, and the voltage detection coefficient of the hysteresis circuit 103, a preset voltage upper limit value can be determined. The voltage upper limit value is set according to the following formula (5), which is as follows:

[0084]

[0085] Optionally, v inH Used to indicate the preset upper voltage limit, v sen R1 is used to represent the voltage monitoring threshold of voltage monitor 1031, X is used to represent the voltage detection coefficient of hysteresis circuit 103, R1 is used to represent the resistance value of first resistor 321, R2 is used to represent the resistance value of second resistor 322, and R3 is used to represent the resistance value of third resistor 323.

[0086] Optionally, an upper voltage limit is set based on the voltage monitoring threshold of the voltage monitor 1031, the voltage detection coefficient of the hysteresis circuit 103, and the resistance values ​​of the first resistor 321, the second resistor 322, and the third resistor 323 in the first voltage divider unit 1032. Based on the set upper voltage limit, it can be determined whether the power supply voltage provided by the power supply circuit selected by the power selection circuit 101 is a stable power supply voltage.

[0087] In one optional implementation, the power control chip 102 in the power control device 10 provided in this application embodiment can be implemented by a power control chip.

[0088] In one alternative implementation, see [link to implementation details]. Figure 6 The power control chip 102 in the power control device 10 provided in this application embodiment is implemented by a power control chip 102 driven by a high-level enable. The specific working principle of the power control device 10 is as follows: When the supply voltage Vin input to the power control chip 102 changes from low to high, the supply voltage Vin is higher than the preset upper voltage limit VinH. The voltage monitor 1031 applies a high level to the enable terminal of the power control chip 102, the power control chip is turned on, and the power control chip 102 connects the power selection circuit 101 to supply power to the external load; when the supply voltage Vin input to the power control chip 102 changes from high to low, the supply voltage Vin is lower than the preset lower voltage limit VinL. The voltage monitor 1031 applies a low level to the enable terminal of the power control chip 102, the power control chip 102 is turned off, and the power control chip 102 no longer supplies power to the external load.

[0089] It is worth noting that VinH is used to represent the preset upper voltage limit, VinL is used to represent the preset lower voltage limit, VoH is used to indicate that a high level is applied to the enable terminal of the power control chip 102, and VoL is used to indicate that a low level is applied to the enable terminal of the power control chip 102.

[0090] Specifically, the voltage monitor 1031 is used to monitor the power supply voltage, and when the power supply voltage reaches the preset upper voltage limit, it inputs a high level to the enable terminal of the power control chip 102, and when the power supply voltage reaches the preset lower voltage limit, it inputs a low level to the enable terminal of the power control chip 102.

[0091] In one alternative implementation, see [link to implementation details]. Figure 7 The hysteresis circuit 103 in the power control device 10 provided in this application embodiment further includes a flip unit 1034.

[0092] It is worth noting that the hysteresis circuit 103 in the power control device 10 only needs to introduce an additional toggling unit 1034 when the power control chip in the power control chip 102 is a low-level enabled power control chip.

[0093] The other end of the fourth resistor 331 and the output of the voltage monitor 1031 are both connected to the enable terminal of the power control chip 102 through the flip unit 1034. The flip unit 1034 is also connected to the input terminal of the power control chip 102.

[0094] Optionally, the flip unit 1034 pulls down the level of the enable terminal of the power control chip 102 under the action of the voltage controller 1031, so that the power control chip 102 is turned on under the action of the low level.

[0095] In one alternative implementation, see [link to implementation details]. Figure 8 The switching unit 1034 in the hysteresis circuit 103 of the power control device 10 provided in this application embodiment includes: an N-type metal oxide semiconductor transistor 341 and a fifth resistor 342.

[0096] It is worth noting that the fifth resistor 342 in the flip unit 1034 is a pull-up resistor. The fifth resistor 342 can pull the enable terminal of the power control chip 102 high. When the N-type metal oxide semiconductor transistor 341 is turned on, the N-type metal oxide semiconductor transistor 341 can pull the high level of the enable terminal of the power control chip 102 low, and the power control chip 102 is turned on.

[0097] Alternatively, the N-type metal-oxide-semiconductor transistor 341 can also be implemented by a transistor, and this application does not specifically limit this.

[0098] The gate of the N-type metal-oxide-semiconductor transistor 341 is connected to the output terminal of the voltage monitor 1031 and the other end of the fifth resistor 342, respectively. The source of the N-type metal-oxide-semiconductor transistor 341 is grounded. The drain of the N-type metal-oxide-semiconductor transistor 341 and one end of the fifth resistor 342 are both connected to the enable terminal of the power control chip 102. The other end of the fifth resistor 342 is connected to the input terminal of the power control chip 102.

[0099] Optionally, the fifth resistor 342 is used to pull up the input level of the enable terminal of the power control chip 102 to a high level. When the N-type metal-oxide-semiconductor transistor 341 is turned on, it will flip the input level of the enable terminal of the power control chip 102 from a high level to a low level.

[0100] An alternative implementation method is described in [reference]. Figure 9The power control chip 102 in the power control device 10 provided in this application embodiment is implemented by a power control chip driven by a low-level enable. The specific working principle of the power control device 10 is as follows: When the supply voltage Vin input to the power control chip 102 changes from low to high, the supply voltage Vin is higher than the preset upper voltage limit VinH. The voltage monitor 1031 applies a low level to the enable terminal of the power control chip 102, the power control chip 102 is turned on, and the power control chip 102 connects the power selection circuit 101 to supply power to the external load; when the supply voltage Vin input to the power control chip 102 changes from high to low, the supply voltage Vin is lower than the preset lower voltage limit VinL. The voltage monitor 1031 applies a high level to the enable terminal of the power control chip 102, the power control chip 102 is turned off, and the power control chip 102 no longer supplies power to the external load.

[0101] Specifically, the voltage monitor 1031 is used to: monitor the supply voltage, and when the supply voltage reaches the preset upper voltage limit, output a low level to the N-type metal-oxide-semiconductor transistor 341 so that the N-type metal-oxide-semiconductor transistor 341 is turned on, and the N-type metal-oxide-semiconductor transistor 341 and the fifth resistor 342 pull the input level of the enable terminal of the power control chip 102 down to a low level; and when the supply voltage reaches the preset lower voltage limit, output a high level to the N-type metal-oxide-semiconductor transistor 341 so that the N-type metal-oxide-semiconductor transistor 341 is turned off, and the fifth resistor 342 pulls the input level of the enable terminal of the power control chip 102 up to a high level.

[0102] An alternative implementation method is described in [reference]. Figure 10 and Figure 11 In the power control device 10 provided in this application embodiment, the voltage monitor 1031 is a monitoring chip. The voltage monitor 1031 obtains the power supply voltage Vin provided by the power selection circuit 101 to the power control chip via the VDD pin. The voltage monitor 1031 is grounded via the VSS pin and outputs the corresponding level via the VOUT pin of the voltage controller 1031.

[0103] Figure 12 For a schematic diagram of a circuit breaker system provided in this application, see [link to schematic diagram]. Figure 12 The circuit breaker system provided in this application embodiment includes: the power control device 10 and the power supply module 30, wherein the power supply module 30 includes: a fast saturation power supply unit 301 and an external auxiliary power supply unit 302, and the output terminal of the power supply module 30 is connected to the input terminal of the power control device 10.

[0104] Optionally, the fast saturation power supply unit 301 can be implemented by an iron core transformer, and the external auxiliary power supply unit 302 can be powered by an external stable power supply. The power supply voltage provided by the fast saturation power supply unit 301 is unstable, while the power supply voltage provided by the external auxiliary power supply unit 302 is stable. The power selection circuit 101 in the power control device 10 can select either the fast saturation power supply unit 301 or the external auxiliary power supply unit 302 as the power source. This application does not make any specific limitations on this.

[0105] Optionally, the medium-speed saturated power supply unit 301 and the external auxiliary power supply unit 302 of the power supply module 30 are parallel power supplies, and the power supply module 30 can provide the power required by the circuit breaker system.

[0106] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

[0107] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A power control device, characterized in that, The power control device includes: a power selection circuit, a power control chip, and a hysteresis circuit, wherein the hysteresis circuit includes: a voltage monitor; The input terminal of the power selection circuit is used to connect to the power supply voltage. The output terminal of the power selection circuit is connected to the input terminal of the power control chip. The output terminal of the power selection circuit is also connected to the input terminal of the hysteresis circuit. The output terminal of the hysteresis circuit is connected to the enable terminal of the power control chip. The output terminal of the power control chip is connected to an external load. The voltage monitor is used to monitor the power supply voltage input to the power control chip by the power selection circuit, and control the input level of the enable terminal of the power control chip according to the power supply voltage, the preset upper voltage limit and the preset lower voltage limit, so that the power control chip is turned on or off from the load.

2. The power control device according to claim 1, characterized in that, The hysteresis circuit further includes: a first voltage divider unit and a second voltage divider unit; The first end of the first voltage divider unit is connected to the output end of the power selection circuit and the input end of the power control chip, respectively. The second end of the first voltage divider unit is connected to one end of the second voltage divider unit. The other end of the second voltage divider unit and the output end of the voltage monitor are both connected to the enable end of the power control chip. The third end of the first voltage divider unit is connected to the input end of the voltage monitor. The fourth end of the first voltage divider unit and the ground end of the voltage monitor are both grounded.

3. The power control device according to claim 2, characterized in that, The first voltage divider unit includes: a first resistor, a second resistor, and a third resistor; One end of the first resistor is connected to the output terminal of the power selection circuit and the input terminal of the power control chip, respectively. The other end of the first resistor is connected to one end of the second resistor and one end of the second voltage divider unit, respectively. The other end of the second resistor is connected to one end of the third resistor and the input terminal of the voltage monitor, respectively. The other end of the third resistor is grounded.

4. The power control device according to claim 3, characterized in that, The second voltage divider unit includes: a fourth resistor; One end of the fourth resistor is connected to the other end of the first resistor and one end of the second resistor, respectively. The other end of the fourth resistor and the output terminal of the voltage monitor are both connected to the enable terminal of the power control chip.

5. The power control device according to claim 2, characterized in that, The voltage monitor is specifically used to: monitor the power supply voltage, and when the power supply voltage reaches the preset upper voltage limit, input a high level to the enable terminal of the power control chip, and when the power supply voltage reaches the preset lower voltage limit, input a low level to the enable terminal of the power control chip.

6. The power control device according to claim 4, characterized in that, The hysteresis circuit further includes: a flip unit; The other end of the fourth resistor and the output of the voltage monitor are both connected to the enable terminal of the power control chip through the flip unit. The flip unit is also connected to the input terminal of the power control chip.

7. The power control device according to claim 6, characterized in that, The switching unit includes: an N-type metal-oxide-semiconductor transistor and a fifth resistor; The gate of the N-type metal-oxide-semiconductor transistor is connected to the output terminal of the voltage monitor and the other end of the fifth resistor, respectively. The source of the N-type metal-oxide-semiconductor transistor is grounded. The drain of the N-type metal-oxide-semiconductor transistor and one end of the fifth resistor are both connected to the enable terminal of the power control chip. The other end of the fifth resistor is connected to the input terminal of the power control chip.

8. The power control device according to claim 7, characterized in that, The voltage monitor is specifically used to: monitor the supply voltage, and when the supply voltage reaches the preset upper voltage limit, output a low level to the N-type metal-oxide-semiconductor transistor to turn on the N-type metal-oxide-semiconductor transistor, and the N-type metal-oxide-semiconductor transistor and the fifth resistor pull the input level of the enable terminal of the power control chip down to a low level; and when the supply voltage reaches the preset lower voltage limit, output a high level to the N-type metal-oxide-semiconductor transistor to turn off the N-type metal-oxide-semiconductor transistor, and the fifth resistor pulls the input level of the enable terminal of the power control chip up to a high level.

9. The power control device according to any one of claims 1-8, characterized in that, The voltage monitor is a monitoring chip.

10. A circuit breaker system, characterized in that, The circuit breaker system includes: a power control device and a power supply module as described in any one of claims 1-9, wherein the power supply module includes: an external auxiliary power supply unit and a fast saturation power supply unit, and the output terminal of the power supply module is connected to the input terminal of the power control device.

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