Power supply time sequence control circuit and power supply
By combining a multi-output module, a power-down timing control module, and a power-on timing control module, simplified power-on and power-off timing control of the power supply is achieved using optocouplers and switching transistors. This solves the problems of complex and costly power supply timing control in existing technologies and realizes low-cost power supply timing control.
Patent Information
- Application Number
- CN202423276905.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-26
- Publication Date
- 2025-12-16
- Estimated Expiration
- 2034-12-26
AI Technical Summary
Existing power supply timing control circuits are cumbersome, costly, and have limited applicability, and it is difficult to achieve full timing control of the power supply.
The system employs a multi-output module, a power-down timing control module, and a power-on timing control module. By controlling the power-on and power-off timing of the first power supply terminal, a simplified power supply control process is achieved. A drive unit composed of optocouplers and switching transistors is used to control the conduction and shutdown of the power supply terminal according to the voltage magnitude.
It achieves simple and low-cost power-on/off timing control of the power supply, has strong applicability, and the control process is easy to implement, reducing hardware costs and complexity.
Smart Images
Figure CN223680949U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of power management, in particular to a power supply timing control circuit and a power supply. BACKGROUND
[0002] In the industrial control field, when multiple voltage supplies are needed, in order to ensure the safe and reliable operation of the system, the power-on and power-off timing of the power supply usually needs to be controlled.
[0003] In the prior art, the timing control of the power supply mainly adopts the following three schemes: the first scheme realizes it by adjusting the EN (enable pin) sequence of multiple power supply circuits, in which scheme, a control chip can only provide one output, in order to realize multi-timing control, multiple control chips are needed, by controlling the EN (enable pin) of each circuit, the power-on and power-off timing of the power supply can be controlled, but the hardware cost and complexity are increased, and at the same time, the space utilization and heat dissipation of the circuit board may be affected. The second scheme controls the power supply output by adjusting the PWM (pulse width modulation) signal to realize the power-on and power-off timing control, but this method needs complex signal processing and accurate timing control, which increases the complexity and cost of the control circuit, and may affect the stability and response speed of the circuit. The third scheme is to build a power-on timing control circuit based on discrete components in a multi-output power supply circuit, which only controls the timing of the power-on stage, although it simplifies the control process, but it cannot control the timing of the power-off stage, and cannot meet the timing control requirements of the power supply, and has low applicability. CONTENT OF THE UTILITY MODEL
[0004] The main purpose of the present application is to provide a power supply timing control circuit and a power supply, which aims to solve the problems of complicated control process, high cost and low applicability of the existing power supply timing control circuit.
[0005] In order to achieve the above-mentioned purpose, the present application provides a power supply timing control circuit, which comprises a multi-output module, a power-off timing control module and a power-on timing control module;
[0006] The input end of the multi-output module is connected with an input power supply, the multi-output module comprises a first voltage output end and a second voltage output end, the first voltage output end is used for outputting a first voltage to a first power supply end, the second voltage output end is used for outputting a second voltage to a second power supply end, and the first power supply end and the second power supply end are respectively connected with a load;
[0007] The first input end of the power-down timing control module is connected with the first voltage output end, the second input end of the power-down timing control module is connected with the input power supply, the output end of the power-down timing control module is connected with the first input end of the power-up timing control module, the second input end of the power-up timing control module is connected with the second voltage output end, and the output end of the power-up timing control module is connected with the first power supply end.
[0008] The power-up timing control module is configured to control the first voltage output end and the first power supply end to be turned on or turned off according to the voltage of the second voltage output end, so as to control the power-up of the first power supply end, and the second power supply end is powered up first, and the first power supply end is powered up later.
[0009] The power-down timing control module is configured to control the first voltage output end and the first power supply end to be turned on or turned off according to the input voltage of the input power supply, so as to control the power-down of the first power supply end, and the first power supply end is powered down first, and the second power supply end is powered down later.
[0010] In an embodiment, the multi-output module is configured to output a first voltage through the first voltage output end and output a second voltage through the second voltage output end when the input voltage is greater than a preset power-up threshold, and stop outputting the first voltage through the first voltage output end and stop outputting the second voltage through the second voltage output end when the input voltage is less than a preset power-down threshold, and the preset power-up threshold is greater than the preset power-down threshold.
[0011] In an embodiment, the power-down timing control module comprises a first switch tube and a power-down driving unit, the input end of the power-down driving unit is connected with the input power supply, the output end of the power-down driving unit is connected with the controlled end of the first switch tube, the first end of the first switch tube is connected with the first voltage output end, the second end of the first switch tube is connected with the power-up timing control module, and the power-down driving unit is configured to output a first control signal to control the first switch tube to be turned on or turned off according to the input voltage of the input power supply.
[0012] In an embodiment, the power-up timing control module comprises a second switch tube and a power-up driving unit, the input end of the power-up driving unit is connected with the second voltage output end, the output end of the power-up driving unit is connected with the controlled end of the second switch tube, the first end of the second switch tube is connected with the power-down timing control module, the second end of the second switch tube is connected with the first power supply end, and the power-up driving unit is configured to output a second control signal to control the second switch tube to be turned on or turned off according to the voltage of the second voltage output end.
[0013] In an embodiment, the lower power driving unit comprises an optocoupler, one input end of the optocoupler is connected with the input power supply, the other input end of the optocoupler is grounded, one output end of the optocoupler is connected with the controlled end of the first switch tube, and the other output end of the optocoupler is grounded.
[0014] In an embodiment, the lower power driving unit further comprises a first resistor, a second resistor, a third resistor and a first capacitor, one input end of the optocoupler is connected with the input power supply through the first resistor, the second resistor and the first capacitor are connected in parallel between the two input ends of the optocoupler, and one output end of the optocoupler is connected with the controlled end of the first switch tube through the third resistor.
[0015] In an embodiment, the lower power timing control module further comprises a fourth resistor, which is connected between the first end and the controlled end of the first switch tube.
[0016] In an embodiment, the upper power driving unit comprises a third switch tube, the controlled end of the third switch tube is connected with the second voltage output end, the first end of the third switch tube is connected with the controlled end of the second switch tube, and the second end of the third switch tube is grounded.
[0017] In an embodiment, the upper power driving unit further comprises a fifth resistor, a sixth resistor, an eighth resistor and a second capacitor, the controlled end of the third switch tube is connected with the second voltage output end through the fifth resistor, the sixth resistor and the second capacitor are connected in parallel between the controlled end and the second end of the third switch tube, and the first end of the third switch tube is connected with the controlled end of the second switch tube through the eighth resistor.
[0018] In an embodiment, the upper power timing control module further comprises a seventh resistor, which is connected between the first end and the controlled end of the second switch tube.
[0019] In addition, in order to achieve the above-mentioned purpose, the application further provides a power supply comprising the power supply timing control circuit.
[0020] The application provides a power supply timing control circuit and a power supply. BRIEF DESCRIPTION OF DRAWINGS
[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of the drawings shown.
[0022] Figure 1 The functional module schematic diagram of the power supply timing control circuit provided by the present application is shown in the figure.
[0023] Figure 2 The circuit structure schematic diagram of the power supply timing control circuit provided by the present application is shown in the figure.
[0024] Figure 3 The power-on and power-off timing schematic diagram of the power supply timing control circuit provided by the present application is shown in the figure.
[0025] The implementation, functional features and advantages of the present application will be further described with reference to the embodiments and the drawings. DETAILED DESCRIPTION
[0026] With reference to the drawings and the embodiments of the present application, the technical solutions in the embodiments of the present application will be described clearly and completely. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative effort are within the scope of protection of the present application.
[0027] It should be noted that if the embodiments of the present application involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative positional relationship, movement condition, etc. between components in a certain posture, and if the certain posture changes, the directional indications also change accordingly.
[0028] In addition, the descriptions such as “first”, “second” and the like in the embodiments of the present application are only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the technical features indicated or the number of the technical features indicated. Therefore, the features defined as “first”, “second” can explicitly or implicitly include at least one of the features. In the description of the embodiments of the present application, the meaning of “a plurality of” is at least two, for example, two, three, etc., unless otherwise specifically limited.
[0029] In the embodiments of the present application, unless otherwise specifically defined and limited, the terms “connection”, “fixation” and the like should be understood in a broad sense, for example, “fixation” can be fixed connection, or detachable connection, or integral; can be mechanical connection, or electrical connection; can be direct connection, or indirect connection through an intermediate medium; can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise specifically defined. For a person of ordinary skill in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.
[0030] In addition, the technical solutions of the various embodiments of the present application can be combined with each other, but it must be based on the fact that a person of ordinary skill in the art can realize it, and when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, and is not within the protection scope claimed by the embodiments of the present application.
[0031] In order to better understand the above technical solutions, the above technical solutions will be described in detail below with reference to the drawings.
[0032] In an embodiment of the present application, as shown in Figure 1 The power supply timing control circuit includes a multi-output module 10, a power-down timing control module 20 and a power-up timing control module 30.
[0033] The input end of the multi-output module 10 is connected with an input power supply, the multi-output module 10 comprises a first voltage output end and a second voltage output end, the first voltage output end is used for outputting a first voltage to a first power supply end, the second voltage output end is used for outputting a second voltage to a second power supply end, and the first power supply end and the second power supply end are connected with loads respectively.
[0034] The first input end of the power-off timing control module 20 is connected with the first voltage output end, the second input end of the power-off timing control module 20 is connected with the input power supply, the output end of the power-off timing control module 10 is connected with the first input end of the power-on timing control module 30, the second input end of the power-on timing control module 30 is connected with the second voltage output end, and the output end of the power-on timing control module 30 is connected with the first power supply end.
[0035] The power-on timing control module 30 is used for controlling conduction or turn-off between the first voltage output end and the first power supply end according to the voltage size of the second voltage output end, so as to control the power-on of the first power supply end, so that the second power supply end is powered on first and the first power supply end is powered on later.
[0036] The power-off timing control module 20 is used for controlling conduction or turn-off between the first voltage output end and the first power supply end according to the input voltage size of the input power supply, so as to control the power-off of the first power supply end, so that the first power supply end is powered off first and the second power supply end is powered off later.
[0037] In the embodiment, the input power supply provides an input voltage to the multi-output module 10, and the multi-output module 10 converts the input voltage and simultaneously outputs multiple voltages to different loads. The first voltage output end is used to output a first voltage to the first power supply end to supply power to the load through the first power supply end, and the second voltage output end is used to output a second voltage to the second power supply end to supply power to the load through the second power supply end. The power-on timing control module 30 and the power-off timing control module 20 are used to control the conduction and turn-off between the first voltage output end and the first power supply end, thereby realizing the power-on and power-off control of the multi-output module 10. Specifically, in the power-on process, after the second voltage output end completely outputs the second voltage (at this time, the second voltage output end and the second power supply end are in conduction, and the load is normally powered), the power-on timing control module 30 controls the conduction between the first voltage output end and the first power supply end, thereby realizing the power-on of the second voltage and the power-on of the first voltage. In the power-off process, when the input voltage is less than the preset threshold of the power-off control module 20, the power-off control module 20 controls the turn-off between the first voltage output end and the first power supply end, at this time, the first power supply end has no first voltage output, and the first voltage is powered off, and when the input voltage is less than the preset power-off threshold of the multi-output module 10 (the preset power-off threshold is less than the preset threshold), the multi-output module 10 stops outputting the voltage, the second voltage output end stops outputting the second voltage, at this time, the second power supply end has no second voltage output, and the second voltage is powered off, thereby realizing the power-off of the first voltage and the power-off of the second voltage.
[0038] The technical scheme provided in the embodiment realizes the power-on and power-off timing control of the multi-output module 10 through the power-off timing control module 20 and the power-on timing control module 30, has simple circuit, low cost, simple control process, and is easy to realize.
[0039] In an embodiment of the present application, the multi-output module 10 is used to output the first voltage through the first voltage output end and output the second voltage through the second voltage output end when the input voltage is greater than the preset power-on threshold, and stop outputting the first voltage through the first voltage output end and stop outputting the second voltage through the second voltage output end when the input voltage is less than the preset power-off threshold, and the preset power-on threshold is greater than the preset power-off threshold.
[0040] In the embodiment, the multi-output module 10 can output multiple voltages simultaneously, which can be an isolated power supply or other power supply module capable of outputting multiple voltages simultaneously. By adjusting the preset lower power threshold and the preset upper power threshold of the internal control chip of the multi-output module 10, specifically, making the preset upper power threshold greater than the preset lower power threshold, so that when the input voltage reaches the preset upper power threshold, the multi-output module 10 starts to output voltage, and when the input voltage is less than the preset lower power threshold, the multi-output module 10 stops outputting voltage. For example, when the input power supply is powered on to 13V, the internal control chip of the multi-output module 10 is turned on, +5V is output through the first voltage output end, and +15V is output through the second voltage output end. When the input power supply is powered off to 11V, the first voltage output end stops outputting +5V. The second voltage output end stops outputting +15V.
[0041] In the technical scheme provided in the embodiment, by setting the preset lower power threshold and the preset upper power threshold, cooperating with the power-on timing control module 30 and the power-off timing control module 20, the power-on and power-off timing control can be realized faster and more accurately.
[0042] In an embodiment of the present application, as shown in Figure 2 The power-off timing control module 20 includes a first switch tube Q1 and a power-off driving unit 201. The input end of the power-off driving unit 201 is connected with the input power supply, the output end of the power-off driving unit is connected with the controlled end of the first switch tube Q1, the first end of the first switch tube Q1 is connected with the first voltage output end, and the second end of the first switch tube Q1 is connected with the power-on timing control module 30. The power-off driving unit 201 is used to output a first control signal to control the first switch tube to be turned on or turned off according to the input voltage of the input power supply.
[0043] In the embodiment, the first switch tube Q1 is a device with switching function, for example, the first switch tube Q1 can be a PMOS tube, at this time, the gate of the first switch tube Q1 is connected with the output end of the power-off driving unit 201, the source of the first switch tube Q1 is connected with the first voltage output end, and the drain of the first switch tube Q1 is connected with the power-on timing control module 30. In other embodiments, the first switch tube Q1 can be selected according to the actual needs of the circuit, such as MOSFET switch tube, triode or other forms of electronic fire mechanical control switch, and the corresponding power-off driving unit 201 can be adjusted as needed.
[0044] In the power-off process, when the input voltage of the input power supply is less than a preset threshold, the power-off driving unit 201 outputs a first control signal for turning off the first switch tube Q1, so that the first voltage output end is turned off from the first power supply end, and the power-off control of the first power supply end is realized. It can be understood that the preset threshold is greater than the preset power-off threshold of the multi-output module 10, so that the second voltage output end still has a second voltage output at this time, and the second power supply end normally supplies power. When the input voltage is less than the preset power-off threshold, the multi-output module 10 turns off the rear-stage output, the second voltage output stops outputting the second voltage, and the second power supply end stops supplying power, so that the first voltage is powered off first and the second voltage is powered off later in the power-off process.
[0045] In an embodiment of the present application, as shown in Figure 2 The power-on timing control module 30 includes a second switch tube Q2 and a power-on driving unit 301. The input end of the power-on driving unit 301 is connected with the second voltage output end, the output end of the power-on driving unit 301 is connected with the controlled end of the second switch tube Q2, the first end of the second switch tube Q2 is connected with the power-off timing control module 20, and the second end of the second switch tube Q2 is connected with the first power supply end. The power-on driving unit is used for outputting a second control signal to control the conduction or turn-off of the second switch tube according to the voltage of the second voltage output end.
[0046] In the embodiment, the second switch tube Q2 is a device with switching function, for example, the second switch tube Q2 can be a PMOS tube, at this time, the gate of the second switch tube Q2 is connected with the output end of the power-on driving unit 301, the source of the second switch tube Q2 is connected with the power-off timing control module 20, and the drain of the second switch tube Q2 is connected with the load. In other embodiments, the second switch tube Q2 can be selected according to the actual needs of the circuit, such as MOSFET switch tube, triode or other forms of electronic fire mechanical control switch, and the corresponding power-on driving unit 301 can be adjusted as needed.
[0047] In a specific embodiment, the second switch tube Q2 is connected with the first switch tube Q1 in the power-off timing control module 20, that is, the first switch tube Q1 and the second switch tube Q2 are connected in series between the first voltage output end and the first power supply end.
[0048] In the power-on process, when the input voltage of the input power supply is greater than a preset threshold, the power-off driving unit 201 outputs a first control signal for turning on the first switch tube Q1, the first switch tube Q1 is turned on, when the input voltage of the input power supply is greater than a preset power-on threshold, the multi-output module 10 starts to output a voltage, the second voltage output end normally outputs a second voltage, after the second voltage is output (at this time, the second power supply end outputs the second voltage to the load), the power-on driving unit 301 outputs a second control signal for turning on the second switch tube Q2, the second switch tube Q2 is turned on, at this time, the first voltage output end and the first power supply end are turned on, the first power supply end outputs a first voltage, so that in the power-on process, the second voltage is powered on first, and the first voltage is powered on later.
[0049] In the technical scheme provided by the embodiment, the first switch tube Q1 and the second switch tube Q2 are used to realize the turn-on and turn-off between the first voltage output end and the first power supply end, and realize the power-on and power-off control of the first power supply end, so that the first power supply end is powered on after the second power supply end is powered on, and can be powered off before the second power supply end is powered off.
[0050] In an embodiment of the present application, as shown in Figure 2 The power-off driving unit 201 includes an optical coupler U1, one input end of the optical coupler U1 is connected with the input power supply, the other input end of the optical coupler U1 is grounded, one output end of the optical coupler U1 is connected with the controlled end of the first switch tube Q1, and the other output end of the optical coupler U1 is grounded.
[0051] In the embodiment, the optical coupler U1 transmits electrical signals through optical signals, has excellent anti-interference ability, and can accurately and quickly output corresponding first control signals to the controlled end of the first switch tube Q1 according to the size of the input voltage, to control the turn-on or turn-off of the first switch tube Q1.
[0052] Further, the power-off driving unit 20 further includes a first resistor R1, a second resistor R2, a third resistor R3 and a first capacitor C1, one input end of the optical coupler U1 is connected with the input power supply through the first resistor R1, the second resistor R2 and the first capacitor C1 are connected in parallel between the two input ends of the optical coupler U1, and one output end of the optical coupler U1 is connected with the controlled end of the first switch tube Q1 through the third resistor R3.
[0053] In the embodiment, the first resistor R1 is a current-limiting resistor, the second resistor R2 and the third resistor R3 are voltage-dividing resistors, and the second resistor R2 and the first capacitor C1 form a filter circuit. In a specific implementation, a voltage at which the optocoupler U1 is fully turned on is a preset threshold value, for example, the preset threshold value is 13V, one end of the first resistor R1 is connected to the input power supply, after the input power supply is powered on, a voltage-dividing voltage is generated across the second resistor R2, when the voltage across the second resistor R2 is greater than the preset threshold value 13V of the optocoupler U1, the optocoupler U1 is turned on, at this time, one end of the third resistor R3 outputs a first control signal for turning on the first switch tube Q1, the first switch tube Q1 is turned on, after the second voltage output end completes output of a second voltage, the power-on timing control module 30 is turned on, and the first power supply end outputs a first voltage. When the input power supply is powered off, when the voltage across the second resistor R2 is less than the preset threshold value 13V of the optocoupler U1, the optocoupler U1 is turned off, at this time, the first switch tube Q1 is turned off, the first voltage output end and the first power supply end are turned off, the first power supply end stops outputting the first voltage, and the first voltage is powered off.
[0054] In an embodiment of the present application, in order to discharge the charge between the first end and the controlled end of the first switch tube Q1, continuing to refer to Figure 2 , the power-off timing control module 20 further includes a fourth resistor R4, one end of the fourth resistor R4 is connected to the first end of the first switch tube Q1, and the other end of the fourth resistor R4 is connected to the controlled end of the first switch tube Q1.
[0055] In an embodiment of the present application, as Figure 2 shown in the figure, the power-on driving unit 30 includes a third switch tube Q3, the controlled end of the third switch tube Q3 is connected to the second voltage output end, the first end of the third switch tube Q3 is connected to the controlled end of the second switch tube Q2, and the second end of the third switch tube Q3 is grounded.
[0056] In the embodiment, the third switch tube Q3 is a device with a switching function, for example, the third switch tube Q3 can be an NMOS tube, at this time, the gate of the third switch tube Q3 is connected to the second voltage output end, the drain of the third switch tube Q3 is connected to the controlled end of the second switch tube Q2, and the source of the third switch tube Q3 is grounded. In other embodiments, the third switch tube Q3 can be selected according to actual needs of the circuit, for example, a MOSFET switch tube, a triode or other forms of electronic fire mechanical control switch, and the corresponding power-on driving unit 301 can be adjusted as needed.
[0057] Further, the power-on driving unit 301 further comprises a fifth resistor R5, a sixth resistor R6, an eighth resistor R8 and a second capacitor C2, the controlled end of the third switch tube Q3 is connected with the second voltage output end through the fifth resistor R5, the sixth resistor R6 and the second capacitor C2 are connected in parallel between the controlled end and the second end of the third switch tube Q3, and the first end of the third switch tube Q3 is connected with the controlled end of the second switch tube Q2 through the eighth resistor R8.
[0058] In the embodiment, the fifth resistor R5 is a current-limiting resistor, the sixth resistor R6 and the eighth resistor R8 are voltage-dividing resistors, and the sixth resistor R6 and the second capacitor C2 constitute a filter circuit.
[0059] Specifically, one end of the fifth resistor R5 is connected with the second voltage output end, after the input power supply is powered on, when the input voltage is greater than the preset power-on threshold of the multi-circuit output module 10, the second voltage output end outputs a second voltage, after the second voltage is completely output, the sixth resistor R6 generates a voltage division between two ends, when the voltage between two ends of the sixth resistor R6 is greater than the conduction voltage of the third switch tube Q3, the third switch tube Q3 is turned on, at this time, one end of the eighth resistor outputs a second control signal for turning on the second switch tube Q2, the second switch tube Q2 is turned on, and the first power supply end outputs a first voltage, thereby realizing that the second power supply end is powered on first and the first power supply end is powered on later.
[0060] In an embodiment of the present application, in order to discharge the charge between the first end and the controlled end of the second switch tube Q2, continuing to refer to Figure 2 , the power-on timing control module 30 further comprises a seventh resistor R7, one end of the seventh resistor R7 is connected with the first end of the second switch tube Q2, and the other end of the seventh resistor R7 is connected with the controlled end of the second switch tube Q2.
[0061] In order to better understand the present application, combined with the reference Figure 2 and Figure 3 , the working process of the power supply timing control circuit will be described below through a specific embodiment:
[0062] When the input power is powered on, as the input voltage gradually increases, when the input voltage is greater than +13V (i.e. a preset threshold value, which is greater than a preset power-off threshold value of the multi-output module 10), for the optocoupler U1, at this time IF>CTR*IC (in the formula: IF is the forward current, CTR is the current transfer ratio, and IC is the collector current of the photosensitive triode), the optocoupler U1 is turned on, the first switch tube Q1 is turned on, when the input voltage is greater than the preset power-on threshold value +13V of the multi-output module 10, the first voltage output end of the multi-output module 10 outputs the first voltage +5V, and the second voltage output end outputs the second voltage +15V, at this time the second voltage +15V normally outputs to start power-on, after the second voltage +15V is completely output, the third switch tube Q3 is turned on, the second switch tube Q2 is turned on, the first voltage output end and the first power supply end are turned on, the first power supply end outputs the first voltage +5V to supply power to the load, and the first voltage +5V completes power-on, thereby realizing the power-on timing control that the second voltage +15V is powered on first and the first voltage +5V is powered on later.
[0063] When the input power is powered off, as the input voltage gradually decreases, when the input voltage is less than +13V, for the optocoupler U1, at this time IF<CTR*IC (in the formula: IF is the forward current, CTR is the current transfer ratio, and IC is the collector current of the photosensitive triode), the optocoupler U1 is turned off, the first switch tube Q1 is turned off, the first voltage output end and the first power supply end are turned off, the first power supply end stops the first voltage +5V, the first voltage +5V is powered off, when the input voltage is less than the preset power-off threshold value +11V of the multi-output module 10, the second voltage output end of the multi-output module 10 stops outputting the second voltage +15V, the second power supply end stops the second voltage +15V, and the second voltage +15V is powered off, thereby realizing the power-off timing control that the first voltage +5V is powered off first and the second voltage +15V is powered off later.
[0064] The application also provides a power supply comprising the power supply timing control circuit in any of the above embodiments, and the specific structure of the power supply timing control circuit is referred to the above embodiments. Since the power supply adopts all the technical solutions of the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here.
[0065] The corresponding technical features in each of the above embodiments can be used with each other without causing contradictory or unimplementable schemes.
[0066] It should be noted that, in this document, the terms "comprising", "comprises" or any other variation thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can also include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element preceded by "comprises a" does not, without more limitations, foreclose the existence of additional identical elements in the process, method, article, or apparatus that comprises the recited element.
[0067] The embodiments of the present application are described above with reference to the accompanying drawings, but the present application is not limited to the specific embodiments described above, which are merely illustrative and not restrictive, and a person of ordinary skill in the art can make many forms under the inspiration of the present application without departing from the purpose of the present application and the scope protected by the claims.
Claims
1. A power supply timing control circuit, characterized by comprising: The power supply timing control circuit comprises a multi-output module, a power-off timing control module and a power-on timing control module; The input end of the multi-output module is connected with an input power supply, the multi-output module comprises a first voltage output end and a second voltage output end, the first voltage output end is used for outputting a first voltage to a first power supply end, the second voltage output end is used for outputting a second voltage to a second power supply end, and the first power supply end and the second power supply end are respectively connected with a load; The first input end of the power-off timing control module is connected with the first voltage output end, the second input end of the power-off timing control module is connected with the input power supply, the output end of the power-off timing control module is connected with the first input end of the power-on timing control module, the second input end of the power-on timing control module is connected with the second voltage output end, and the output end of the power-on timing control module is connected with the first power supply end; The power-on timing control module is used for controlling the conduction or turn-off between the first voltage output end and the first power supply end according to the voltage of the second voltage output end, so as to control the power-on of the first power supply end, so that the second power supply end is powered on first and the first power supply end is powered on later. The power-off timing control module is used for controlling the conduction or turn-off between the first voltage output end and the first power supply end according to the input voltage of the input power supply, so as to control the power-off of the first power supply end, so that the first power supply end is powered off first and the second power supply end is powered off later.
2. The power supply timing control circuit of claim 1, wherein, The multi-output module is used for outputting a first voltage through the first voltage output end and outputting a second voltage through the second voltage output end when the input voltage is greater than a preset power-on threshold, and the first voltage output end stops outputting the first voltage and the second voltage output end stops outputting the second voltage when the input voltage is less than a preset power-off threshold, and the preset power-on threshold is greater than the preset power-off threshold.
3. The power supply timing control circuit of claim 1, wherein, The power-off timing control module comprises a first switch tube and a power-off driving unit, the input end of the power-off driving unit is connected with the input power supply, the output end of the power-off driving unit is connected with the controlled end of the first switch tube, the first end of the first switch tube is connected with the first voltage output end, the second end of the first switch tube is connected with the power-on timing control module, and the power-off driving unit is used for outputting a first control signal to control the conduction or turn-off of the first switch tube according to the input voltage of the input power supply.
4. The power timing control circuit of claim 1 or 3, wherein, The power-on timing control module comprises a second switch tube and a power-on driving unit, the input end of the power-on driving unit is connected with the second voltage output end, the output end of the power-on driving unit is connected with the controlled end of the second switch tube, the first end of the second switch tube is connected with the power-off timing control module, the second end of the second switch tube is connected with the first power supply end, and the power-on driving unit is used for outputting a second control signal to control the conduction or turn-off of the second switch tube according to the voltage of the second voltage output end.
5. The power supply timing control circuit of claim 3, wherein, The lower power driving unit comprises an optical coupler, one input end of the optical coupler is connected with the input power supply, the other input end of the optical coupler is grounded, one output end of the optical coupler is connected with the controlled end of the first switch tube, and the other output end of the optical coupler is grounded.
6. The power supply timing control circuit of claim 5, wherein, The lower power driving unit further comprises a first resistor, a second resistor, a third resistor and a first capacitor, one input end of the optical coupler is connected with the input power supply through the first resistor, the second resistor and the first capacitor are connected in parallel between the two input ends of the optical coupler, and one output end of the optical coupler is connected with the controlled end of the first switch tube through the third resistor.
7. The power supply timing control circuit of claim 3, wherein, The lower power timing control module further comprises a fourth resistor, which is connected between the first end and the controlled end of the first switch tube.
8. The power supply timing control circuit of claim 4, wherein, The upper power driving unit comprises a third switch tube, the controlled end of the third switch tube is connected with the second voltage output end, the first end of the third switch tube is connected with the controlled end of the second switch tube, and the second end of the third switch tube is grounded.
9. The power supply timing control circuit of claim 8, wherein, The upper power driving unit further comprises a fifth resistor, a sixth resistor, an eighth resistor and a second capacitor, the controlled end of the third switch tube is connected with the second voltage output end through the fifth resistor, the sixth resistor and the second capacitor are connected in parallel between the controlled end and the second end of the third switch tube, and the first end of the third switch tube is connected with the controlled end of the second switch tube through the eighth resistor.
10. The power supply timing control circuit of claim 4, wherein, The upper power timing control module further comprises a seventh resistor, which is connected between the first end and the controlled end of the second switch tube.
11. A power supply, characterized by, The power supply comprises the power timing control circuit according to any one of claims 1-10.