Power supply time sequence control circuit

Abstract

The utility model provides a power supply time sequence control circuit, which relates to the technical field of power supply time sequence control and comprises a discharge unit, a delay unit and a power supply module. An input pin of the power supply module is connected with a voltage source; the delay unit is connected with control pins of the voltage source, the discharge unit and the power supply module; wherein when the voltage source is powered on, the delay unit boosts the control voltage output to the control pin by the delay unit to a preset voltage threshold value after a preset time is delayed by the delay unit; when the voltage source is powered off, the discharge unit discharges the control voltage, namely discharges the electric quantity stored by the delay unit, so that even under the working condition of frequent power-on and power-off, the electric quantity stored by the delay unit can be quickly released through the discharge unit after the voltage source is powered off, and the delay unit can always work normally. Accurate time sequence control of the power supply module is realized.

Description

TECHNICAL FIELD

[0001] The utility model relates to power time sequence control technical field especially relates to a power time sequence control circuit. BACKGROUND

[0002] In the design of frequency converter, the power-on time sequence of strong and weak electricity needs to have certain requirements, and the normal requirement is that the weak electricity part, that is, the control circuit and the protection circuit part, is powered on first, and then the strong electricity is powered on after the normal control work.

[0003] The traditional power time sequence control is mainly realized through the control pin of the power module, and the working time of the power module can be controlled through the delay circuit.

[0004] However, when the power is frequently powered on and off, the storage power of the delay circuit cannot be quickly discharged, resulting in that the delay circuit cannot work normally next time. Therefore, under the working condition of frequent power-on and power-off, the time sequence of the power module cannot be completely controlled. INVENTION CONTENTS

[0005] The utility model provides a kind of power time sequence control circuit to solve the problem that the storage power of the delay circuit of existing power time sequence control circuit cannot be quickly discharged, resulting in that the delay circuit cannot work normally, cannot realize the control to the time sequence of power module.

[0006] The utility model provides a kind of power time sequence control circuit, including including discharge unit, delay unit and power module;

[0007] The input pin of the power module is connected with voltage source;The delay unit is connected with the voltage source, the discharge unit and the control pin of the power module;

[0008] Wherein, when the voltage source is powered on, the delay unit will control voltage that the delay unit is output to the control pin is lifted to preset voltage threshold after delaying preset time;When the voltage source is powered off, the discharge unit discharges the control voltage.

[0009] Further technical solutions are that the delay unit includes first capacitor, first voltage division unit and second voltage division unit;The first voltage division unit is connected with the voltage source and the second voltage division unit;The second voltage division unit is connected with the control pin and grounded;The first capacitor is connected with the second voltage division unit in parallel.

[0010] Further technical solutions are that the first voltage division unit includes at least one voltage division resistor.

[0011] Further technical solutions are that the second voltage division unit includes at least one voltage division resistor.

[0012] A further technical solution is that the discharge unit comprises a switch tube, a third voltage dividing unit, a fourth voltage dividing unit and a discharge unit; the input end of the switch tube is connected with the control pin; the output end of the switch tube is connected with the discharge unit; the control end of the switch tube is connected with the third voltage dividing unit and the fourth voltage dividing unit respectively; the third voltage dividing unit is connected with the voltage source; the fourth voltage dividing unit and the discharge unit are grounded.

[0013] A further technical solution is that the third voltage dividing unit comprises at least one voltage dividing resistor.

[0014] A further technical solution is that the fourth voltage dividing unit comprises at least one voltage dividing resistor.

[0015] A further technical solution is that the discharge unit comprises at least one discharge resistor.

[0016] A further technical solution is that the power timing control circuit further comprises a filter unit; the voltage source is connected with the filter unit; the filter unit is connected with the delay unit and the input pin of the power module.

[0017] A further technical solution is that the filter unit comprises an inductor and a second capacitor; one end of the inductor is connected with the voltage source; the other end of the inductor is connected with the delay unit and the input pin of the power module; the second capacitor is connected with the inductor and grounded.

[0018] Compared with the prior art, the above technical solution provided by the embodiment of the utility model has the following advantages:

[0019] In the technical solution of the embodiment of the utility model, the power timing control circuit comprises a discharge unit, a delay unit and a power module; the input pin of the power module is connected with a voltage source; the delay unit is connected with the voltage source, the discharge unit and the control pin of the power module; when the voltage source is powered on, the delay unit raises the control voltage outputted from the delay unit to the control pin to a preset voltage threshold after delaying for a preset time; when the voltage source is powered off, the discharge unit discharges the control voltage, that is, discharges the electric quantity stored in the delay unit, so that even in the working condition of frequent power-on and power-off, the discharge unit can quickly release the stored electric quantity of the delay unit after the voltage source is powered off, ensuring that the delay unit can always work normally and realizing precise timing control of the power module. BRIEF DESCRIPTION OF DRAWINGS

[0020] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the utility model and serve to explain the principles of the utility model together with the specification.

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, for those skilled in the art, other drawings can also be obtained based on these drawings without any creative labor.

[0022] One or more embodiments are exemplarily illustrated by the pictures in the drawings corresponding thereto, which do not constitute a limitation on the embodiments, and the elements with the same reference numerals in the drawings represent similar elements, unless otherwise specified, and the drawings do not constitute a proportional limitation.

[0023] Fig. 1 A circuit block diagram of a power timing control circuit provided by the embodiment of the present application.

[0024] Fig. 2 A circuit diagram of a power timing control circuit provided by the embodiment of the present application.

[0025] Explanation of reference numerals:

[0026] The bleed unit 20, the delay unit 30, the power module 40, the first capacitor C1, the first voltage division unit 31, the second voltage division unit 32, the switch tube Q1, the third voltage division unit 21, the fourth voltage division unit 22, the discharge unit 23, the voltage source VCC, the filter unit 11, the inductor L1, and the second capacitor C2. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solutions and advantages of the embodiments of the present application more clear, the following will combine the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are 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 those skilled in the art without any creative labor are within the scope of protection of the present application.

[0028] The following disclosure provides many different embodiments or examples for implementing the various structures of the present application. In order to simplify the disclosure of the present application, the components and settings of specific examples are described in the following. Of course, they are only examples, and the purpose is not to limit the present application. In addition, the present application can repeatedly refer to numerals and / or letters in different examples. Such repetition is for the purpose of simplification and clarity, and it does not indicate the relationship between the various embodiments and / or settings discussed.

[0029] For the convenience of description, spatial relative terms can be used in the specification to describe the relative position relationship or movement condition of one element or feature relative to another element or feature as shown in the drawings, such as "inner", "outer", "inboard", "outboard", "under", "below", "on", "above", "front", "back", etc. Such spatial relative terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the drawings. For example, if the device in the drawings is turned over or the posture is changed or the movement state is changed, the directional indications will also change accordingly, for example: the element described as "under" or "below" another element or feature will be oriented as "above" or "above" another element or feature. Therefore, the example term "below" can include both the upper and lower positions. The device can be additionally oriented (rotated by 90 degrees or in other directions) and the spatial relative relationship descriptors used in the specification are interpreted accordingly.

[0030] In order to solve the problem that the storage power of the delay circuit of the existing power timing control circuit in the prior art cannot be quickly discharged, resulting in that the delay circuit cannot work normally and the timing of the power module cannot be controlled, the utility model provides a power timing control circuit, which can quickly discharge the storage power of the delay unit and ensure that the timing of the power module can be accurately controlled under the working condition of frequent power-on and power-off.

[0031] Referring to Figs. 1-2 The utility model embodiment provides a kind of power timing control circuit, the power timing control circuit includes discharge unit 20, delay unit 30 and power module 40, and specific structure is introduced as follows:

[0032] Voltage source VCC is used to provide power input. The power module 40 includes an input pin VIN, a control pin CTR and a ground pin COM. The input pin VIN is connected with the voltage source VCC, for receiving the power input of the voltage source VCC;The control pin CTR is used to control the state of the power module 40, only when the voltage of the control pin CTR reaches the preset voltage threshold, the power module 40 enters the working state;The ground pin COM is grounded.

[0033] In the utility model, the input pin VIN of the power module 40 is connected with the voltage source VCC;The delay unit 30 is connected with the voltage source VCC, the discharge unit 20 and the control pin CTR of the power module 40.

[0034] Specifically, when the voltage source VCC is powered on (i.e. the voltage source VCC outputs power to the power module 40), the delay unit 30 raises the control voltage outputted by the delay unit 30 to the control pin CTR to a preset voltage threshold after delaying for a preset time, at which time the power module 40 enters a working state.

[0035] Further, when the voltage source VCC is powered off (i.e. the voltage source VCC cuts off the power output to the power module 40), the bleeding unit 20 bleeds the control voltage, i.e. bleeds the electric quantity stored by the delay unit 30, so that even in the working condition of frequent power-on and power-off, the electric quantity stored by the delay unit 30 can be quickly released by the bleeding unit 20 after the voltage source VCC is powered off, ensuring that the delay unit 30 can always work normally, and realizing precise timing control of the power module 40.

[0036] In the technical scheme of the embodiment of the utility model, the power timing control circuit comprises a bleeding unit 20, a delay unit 30 and a power module 40; the input pin VIN of the power module 40 is connected with a voltage source VCC; the delay unit 30 is connected with the voltage source VCC, the bleeding unit 20 and the control pin CTR of the power module 40; when the voltage source VCC is powered on, the delay unit 30 raises the control voltage outputted by the delay unit 30 to the control pin CTR to a preset voltage threshold after delaying for a preset time; when the voltage source VCC is powered off, the bleeding unit 20 bleeds the control voltage, i.e. bleeds the electric quantity stored by the delay unit 30, so that even in the working condition of frequent power-on and power-off, the electric quantity stored by the delay unit 30 can be quickly released by the bleeding unit 20 after the voltage source VCC is powered off, ensuring that the delay unit 30 can always work normally, and realizing precise timing control of the power module 40.

[0037] In some embodiments, for example in the embodiment, the delay unit 30 comprises a first capacitor C1, a first voltage dividing unit 31 and a second voltage dividing unit 32; the first voltage dividing unit 31 is connected with the voltage source VCC and the second voltage dividing unit 32; the second voltage dividing unit 32 is connected with the control pin CTR and grounded; the first capacitor C1 is connected with the second voltage dividing unit 32 in parallel.

[0038] Specifically, the first voltage dividing unit 31 comprises at least one voltage dividing resistor, for example in the embodiment, the first voltage dividing unit 31 comprises a voltage dividing resistor R4. The second voltage dividing unit 32 comprises at least one voltage dividing resistor, for example in the embodiment, the second voltage dividing unit 32 comprises a voltage dividing resistor R5.

[0039] The working principle of the delay unit 30 is as follows: the first voltage dividing unit 31 and the second voltage dividing unit 32 form a voltage dividing circuit; after the voltage source VCC is powered on, the first capacitor C1 is charged after being divided by the second voltage dividing unit 32, and when the voltage of the first capacitor C1 reaches the voltage threshold of the control pin CTR, the power supply module 40 normally works. In this case, the delay time of the power supply module 40 is T, which is calculated as follows:

[0040] T = -R4C2ln((U R5 -U CTR ) / U R5 ) wherein R4 is the resistance of the first voltage dividing unit 31, C2 is the capacitance value of the first capacitor C1, U R5 is the voltage of the second voltage dividing unit 32, and U CTR is the voltage threshold.

[0041] It can be seen that the required delay time T can be controlled by configuring the values of R4, R5 and C2.

[0042] In some embodiments, such as the present embodiment, the bleed unit 20 includes a switch tube Q1, a third voltage dividing unit 21, a fourth voltage dividing unit 22 and a discharge unit 23; the input end of the switch tube Q1 is connected with the control pin CTR, the output end of the switch tube Q1 is connected with the discharge unit 23, and the control end of the switch tube Q1 is connected with the third voltage dividing unit 21 and the fourth voltage dividing unit 22 respectively; the third voltage dividing unit 21 is connected with the voltage source VCC, and the fourth voltage dividing unit 22 and the discharge unit 23 are grounded.

[0043] Specifically, the switch tube Q1 is cut off when the voltage source VCC is powered on, and the switch tube Q1 is turned on when the voltage source VCC is powered off, for example, the switch tube Q1 can be a PNP triode, the input end of the switch tube Q1 corresponds to the emitter of the PNP triode, the output end of the switch tube Q1 corresponds to the collector of the PNP triode, and the control end of the switch tube Q1 corresponds to the base of the PNP triode.

[0044] Further, the third voltage dividing unit 21 and the fourth voltage dividing unit 22 form a voltage dividing circuit, the third voltage dividing unit 21 includes at least one voltage dividing resistor, for example, the third voltage dividing unit 21 includes a voltage dividing resistor R1 in the present embodiment. The fourth voltage dividing unit 22 includes at least one voltage dividing resistor, for example, the fourth voltage dividing unit 22 includes a voltage dividing resistor R2 in the present embodiment. By adjusting the configuration of the third voltage dividing unit 21 and the fourth voltage dividing unit 22, the PNP triode is cut off when the voltage source VCC is powered on, and turned on when the voltage source VCC is powered off.

[0045] Further, the discharging unit 23 comprises at least one bleeder resistor.

[0046] The working principle of the bleeder unit 20 is as follows:

[0047] After the voltage source VCC is powered off, the voltage value of the first capacitor C1 at the power-off moment is U R5 , the voltage value of the control end of the switch tube Q1 is 0, at this time, the voltage of the first capacitor C1 will be quickly discharged through the switch tube Q1 and the discharging unit 23, and the fast discharge time can be adjusted by adjusting the resistance value of the discharging unit 23.

[0048] In some embodiments, for example in the embodiment, the power supply timing control circuit further comprises a filter unit 11, the voltage source VCC is connected with the filter unit 11, and the filter unit 11 is connected with the delay unit 30 and the input pin VIN of the power supply module 40. The filter unit 11 plays a filtering role and is used to improve the stability of the circuit.

[0049] Specifically, the filter unit 11 comprises an inductor L1 and a second capacitor C2; one end of the inductor L1 is connected with the voltage source VCC, the other end of the inductor L1 is connected with the delay unit 30 and the input pin VIN of the power supply module 40; and the second capacitor C2 is connected with the inductor L1 and grounded.

[0050] The LC filter circuit composed of the inductor L1 and the second capacitor C2 can filter out the clutter in the circuit, thereby greatly improving the stability of the circuit.

[0051] In the above embodiments, the description of each embodiment has its own emphasis, and the parts not described in detail in a certain embodiment can be referred to the relevant description of other embodiments.

[0052] In the description of the present application, it should be understood that the orientations or positional relationships indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0053] In addition, the terms "first", "second", "third", etc. are used herein only to describe various circumstances, and should not be construed as indicating or implying relative importance or an indicated number of the technical features. Therefore, the features defined as "first", "second", etc. can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more than two, unless otherwise specifically limited.

[0054] In the present application, unless otherwise specifically defined and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense, for example, it can be connected, or it can be detachable, or it can be integrated; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, or it can be the communication or interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0055] In the present application, unless otherwise specifically defined and limited, the first feature "on" or "under" the second feature can include the direct contact of the first and second features, or the indirect contact of the first and second features through another feature between them. Moreover, the first feature "on", "above" and "above" the second feature includes the first feature directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature includes the first feature directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0056] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms should not be understood as necessarily referring to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in the present application.

[0057] Obviously, those skilled in the art can make various modifications and variations to the present application without departing from the spirit and scope of the present application. Thus, these modifications and variations of the present application are within the scope of the claims of the present application and its equivalent technologies, and the present application also intends to include these modifications and variations.

[0058] The above describes the specific implementation manner of the present application, but the protection scope of the present application is not limited to this, any skilled person in the art can easily think of various equivalent modifications or replacements within the technical range disclosed by the present application, and these modifications or replacements should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A power supply timing control circuit, characterized in that, Includes a discharge unit, a delay unit, and a power module; The input pin of the power module is connected to the voltage source; the delay unit is connected to the voltage source, the discharge unit, and the control pin of the power module. When the voltage source is powered on, the delay unit increases the control voltage output by the delay unit to the control pin to a preset voltage threshold after a preset delay time; when the voltage source is powered off, the discharge unit discharges the control voltage.

2. The power supply timing control circuit according to claim 1, characterized in that, The delay unit includes a first capacitor, a first voltage divider unit, and a second voltage divider unit; the first voltage divider unit is connected to the voltage source and the second voltage divider unit; the second voltage divider unit is connected to the control pin and grounded; the first capacitor and the second voltage divider unit are connected in parallel.

3. The power supply timing control circuit according to claim 2, characterized in that, The first voltage divider unit includes at least one voltage divider resistor.

4. The power supply timing control circuit according to claim 2, characterized in that, The second voltage divider unit includes at least one voltage divider resistor.

5. The power supply timing control circuit according to claim 1, characterized in that, The discharge unit includes a switching transistor, a third voltage divider unit, a fourth voltage divider unit, and a discharge unit; the input terminal of the switching transistor is connected to the control pin, the output terminal of the switching transistor is connected to the discharge unit, and the control terminal of the switching transistor is connected to the third voltage divider unit and the fourth voltage divider unit respectively; the third voltage divider unit is connected to the voltage source, and the fourth voltage divider unit and the discharge unit are grounded.

6. The power supply timing control circuit according to claim 5, characterized in that, The third voltage divider unit includes at least one voltage divider resistor.

7. The power supply timing control circuit according to claim 5, characterized in that, The fourth voltage divider unit includes at least one voltage divider resistor.

8. The power supply timing control circuit according to claim 5, characterized in that, The discharge unit includes at least one bleed resistor.

9. The power supply timing control circuit according to claim 1, characterized in that, The power timing control circuit further includes a filtering unit, the voltage source is connected to the filtering unit, and the filtering unit is connected to the delay unit and the input pin of the power module.

10. The power supply timing control circuit according to claim 9, characterized in that, The filtering unit includes an inductor and a second capacitor; one end of the inductor is connected to the voltage source, and the other end of the inductor is connected to the delay unit and the input pin of the power supply module; the second capacitor is connected to the inductor and grounded.

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