CN214205341U

CN214205341U - Enabling control circuit of negative-pressure power supply module and negative-pressure power supply

Info

Publication number: CN214205341U
Application number: CN202022479386.2U
Authority: CN
Inventors: 杨钊辉; 袁晓航; 钟锋浩
Original assignee: Hangzhou Changchuan Technology Co Ltd
Current assignee: Hangzhou Changchuan Technology Co Ltd
Priority date: 2020-10-30
Filing date: 2020-10-30
Publication date: 2021-09-14
Anticipated expiration: 2030-10-30

Abstract

The application relates to an enabling control circuit of a negative-pressure power supply module and a negative-pressure power supply, wherein the enabling control circuit of the negative-pressure power supply module comprises a controllable switch unit and an isolation conversion unit; the primary side circuit of the isolation conversion unit is connected in series between the first power supply and the input end of the controllable switch unit, and the secondary side circuit of the isolation conversion unit is connected in series between the second power supply and the enabling end of the negative-pressure power supply module; the output end of the controllable switch unit is grounded, and the control end of the controllable switch unit is electrically connected with the enabling controller of the negative-pressure power supply module. Through the enabling control circuit of the negative-pressure power supply and the negative-pressure power supply, the problem that the positive-pressure DC-DC chip cannot be normally controlled to be started or closed by using a conventional positive-pressure control signal when the positive-pressure DC-DC chip is used for negative-pressure output in the related technology is solved, and the purpose of controlling the negative-pressure power supply to be powered up and down by using a common IO port signal is achieved.

Description

Enabling control circuit of negative-pressure power supply module and negative-pressure power supply

Technical Field

The present application relates to the field of digital testing, and in particular, to an enable control circuit of a negative voltage power supply module and a negative voltage power supply.

Background

In a digital testing machine, different board cards have different power supplies, wherein some negative voltage power supplies are needed, but most of the external power supplies for supplying power to the board cards are positive voltage power supplies, and the negative voltage power supplies need to convert positive voltage into negative voltage through a DC-DC power supply circuit and then convert the negative voltage into the needed negative power supplies through an LDO (low dropout regulator).

In the related art, the board card of the digital testing machine is provided with a positive voltage power supply and a negative voltage power supply, and the positive voltage power supply and the negative voltage power supply both have timing requirements when supplying power, so that the negative voltage power supply needs to be controlled by signals, for example: a control signal of the time sequence chip and a control signal of the control chip; in the related art, when the positive-voltage-to-positive-voltage DC-DC is used for negative-voltage output, because the reference ground corresponding to the enable EN pin of the positive-voltage DC-DC chip is the GND pin of the DC-DC chip, and when the positive-voltage DC-DC chip is used for negative-voltage output, the GND pin of the chip is a negative voltage for a system ground, a conventional positive-voltage control signal is used when the positive-voltage DC-DC chip is used for negative-voltage output, and the positive-voltage DC-DC chip cannot be normally controlled to be started or closed.

At present, no effective solution is provided for the problem that the starting or closing of the positive voltage DC-DC chip cannot be normally controlled by using a conventional positive voltage control signal when the positive voltage DC-DC chip is adopted for negative voltage output in the related art.

Disclosure of Invention

The embodiment of the application provides an enabling control circuit of a negative-pressure power supply module and a negative-pressure power supply, and at least solves the problem that when a positive-pressure DC-DC chip is adopted to output negative pressure in the related art, the starting or closing of the positive-pressure DC-DC chip cannot be normally controlled by using a conventional positive-pressure control signal.

In a first aspect, an embodiment of the present application provides an enable control circuit of a negative-voltage power supply module, where the enable control circuit of the negative-voltage power supply module includes a controllable switch unit and an isolation conversion unit; the primary side circuit of the isolation conversion unit is connected in series between a first power supply and the input end of the controllable switch unit, and the secondary side circuit of the isolation conversion unit is connected in series between a second power supply and the enabling end of the negative-pressure power supply module; the output end of the controllable switch unit is grounded, and the control end of the controllable switch unit is electrically connected with the enabling controller of the negative-pressure power supply module.

In some of these embodiments, the controllable switch unit comprises an insulated gate field effect transistor circuit, wherein the insulated gate field effect transistor circuit comprises an insulated gate field effect transistor and a first resistor, wherein a drain of the insulated gate field effect transistor serves as an input terminal of the controllable switch unit, a source of the insulated gate field effect transistor serves as an output terminal of the controllable switch unit, and a gate of the insulated gate field effect transistor serves as a control terminal of the controllable switch unit; one end of the first resistor is electrically connected with the grid electrode, and the other end of the first resistor is grounded.

In some of these embodiments the insulated gate field effect transistor is an enhanced N-channel insulated gate field effect transistor.

In some of these embodiments, the isolated conversion unit comprises an optocoupler; the primary side circuit of the optical coupler comprises a light emitting diode; the anode of the light emitting diode is electrically connected with the first power supply, and the cathode of the light emitting diode is electrically connected with the input end of the controllable switch unit; the secondary side circuit of the optical coupler comprises a photosensitive diode; the photosensitive diode is connected in series between the second power supply and the enabling end of the negative-pressure power supply module.

In some embodiments, the enable control circuit of the negative power supply module further comprises a voltage regulating unit connected in series between the second power supply and the enable terminal of the negative power supply module; the voltage adjusting unit is controlled by the on-off of the secondary side circuit of the isolation conversion unit to be powered up and down, and the second power supply can be adjusted to enable voltage required by an enabling end of the negative-voltage power supply module under the condition that the voltage adjusting unit is powered on.

In some embodiments, the voltage regulation unit includes a second resistor and a third resistor, where the second resistor, the secondary circuit of the isolation conversion unit, and the third resistor are connected in series between the second power supply and the negative voltage output terminal of the negative voltage power supply module, the output terminal of the voltage regulation unit is located between the second resistor and the third resistor, and the output terminal of the voltage regulation unit is electrically connected to the enable terminal of the negative voltage power supply module.

In some embodiments, the enable control circuit of the negative voltage power supply module further includes a voltage stabilizing unit, and the voltage stabilizing unit is connected in series between the negative voltage output end and the enable end of the negative voltage power supply module.

In some embodiments, the voltage stabilizing unit includes a voltage stabilizing tube, an anode of the voltage stabilizing tube is electrically connected to the negative-pressure output end of the negative-pressure power supply module, and a cathode of the voltage stabilizing tube is electrically connected to the enable end of the negative-pressure power supply module.

In some embodiments, the enable control circuit of the negative voltage power supply module further includes a fourth resistor, and the fourth resistor is connected in series between the first power supply and the primary side circuit of the isolation conversion unit.

In a second aspect, an embodiment of the present application provides a negative voltage power supply, where the negative voltage power supply includes a negative voltage power supply module and an enable control circuit of the negative voltage power supply module of the first aspect.

In some of these embodiments, the negative voltage power supply module comprises a positive voltage DC-DC chip comprising an input terminal, an output terminal, a ground terminal, and an enable terminal; the input end of the positive-voltage DC-DC chip is electrically connected with a third power supply, the output end of the positive-voltage DC-DC chip is grounded, the enable end of the positive-voltage DC-DC chip is used as the enable end of the negative-voltage power supply module, and the ground end of the positive-voltage DC-DC chip is used as the negative-voltage output end of the negative-voltage power supply module.

Compared with the related art, the enabling control circuit of the negative-pressure power supply module and the negative-pressure power supply provided by the embodiment of the application comprise a controllable switch unit and an isolation conversion unit; the primary side circuit of the isolation conversion unit is connected in series between the first power supply and the input end of the controllable switch unit, and the secondary side circuit of the isolation conversion unit is connected in series between the second power supply and the enabling end of the negative-pressure power supply module; the output end of the controllable switch unit is grounded, and the control end of the controllable switch unit is electrically connected with the enabling controller of the negative-pressure power supply module. Through the enabling control circuit of the negative-voltage power supply and the negative power supply, the problem that the positive-voltage DC-DC chip cannot be normally controlled to be started or closed by using a conventional positive-voltage control signal when the positive-voltage DC-DC chip is used for negative-voltage output in the related technology is solved, and the purpose of controlling the negative-voltage power supply to be powered up and down by using a common IO port signal is achieved.

The details of one or more embodiments of the application are set forth in the accompanying drawings and the description below to provide a more thorough understanding of the application.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:

fig. 1 is a block diagram of an enable control circuit of a negative voltage power supply module according to an embodiment of the present application.

Fig. 2 is a first structural diagram of an enable control circuit of the negative voltage power supply module according to the preferred embodiment of the present application.

Fig. 3 is a second topology structure diagram of an enable control circuit of the negative voltage power supply module according to the preferred embodiment of the present application.

Fig. 4 is a third topological structure diagram of an enable control circuit of the negative voltage power supply module according to the preferred embodiment of the present application.

Fig. 5 is a topology structure diagram of an enable control circuit of the negative voltage power supply module according to the preferred embodiment of the present application.

Fig. 6 is a fifth topological structure diagram of an enable control circuit of the negative voltage power supply module according to the preferred embodiment of the present application.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application will be described and illustrated below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments provided in the present application without any creative effort belong to the protection scope of the present application. Moreover, it should be appreciated that in the development of any such actual implementation, as in any engineering or design project, numerous implementation-specific decisions must be made to achieve the developers' specific goals, such as compliance with system-related and business-related constraints, which may vary from one implementation to another.

Reference in the specification to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the specification. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one of ordinary skill in the art that the embodiments described herein may be combined with other embodiments without conflict.

Unless defined otherwise, technical or scientific terms referred to herein shall have the ordinary meaning as understood by those of ordinary skill in the art to which this application belongs. Reference to "a," "an," "the," and similar words throughout this application are not to be construed as limiting in number, and may refer to the singular or the plural. The present application is directed to the use of the terms "including," "comprising," "having," and any variations thereof, which are intended to cover non-exclusive inclusions; for example, a process, method, system, article, or apparatus that comprises a list of steps or modules (elements) is not limited to the listed steps or elements, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus. Reference to "connected," "coupled," and the like in this application is not intended to be limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. Reference herein to "a plurality" means greater than or equal to two. "and/or" describes an association relationship of associated objects, meaning that three relationships may exist, for example, "A and/or B" may mean: a exists alone, A and B exist simultaneously, and B exists alone. Reference herein to the terms "first," "second," "third," and the like, are merely to distinguish similar objects and do not denote a particular ordering for the objects.

The enabling control circuit of the negative-pressure power supply module of the embodiment is applied to the control of a negative-12V power supply circuit which uses a positive-pressure power supply chip for negative-pressure output. The negative voltage power module 500 illustrated and described in the present embodiment is implemented as follows: the output end (OUT) of the positive voltage DC-DC chip U1 is grounded, the ground end (GND) of the positive voltage DC-DC chip U1 is used as a negative voltage output end, and when the output of the positive voltage DC-DC chip U1 is 0V, the voltage output by the ground end of the positive voltage DC-DC chip U1 is-12V by utilizing the voltage difference 12V between the output end (OUT) of the positive voltage DC-DC chip U1 and the ground end (GND), so that the function of using the positive voltage DC-DC chip U1 for negative voltage output is realized. In this embodiment, the enable voltage of the positive voltage DC-DC chip U1 corresponding to the negative voltage power supply module is 0.98V, and correspondingly, the enable voltage corresponding to the negative voltage power supply circuit is-11V.

The embodiment provides an enabling control circuit of a negative-voltage power supply module. Fig. 1 is a block diagram illustrating an enable control circuit of a negative voltage power supply module according to an embodiment of the present application, where the enable control circuit of the negative voltage power supply module includes a controllable switch unit 100 and an isolation conversion unit 200, as shown in fig. 1; the primary side circuit 201 of the isolation conversion unit 200 is connected in series between the first power supply V1 and the input end of the controllable switch unit 100, and the secondary side circuit 202 of the isolation conversion unit 200 is connected in series between the second power supply V2 and the enable end of the negative voltage power supply module 500 (the enable end is correspondingly connected to the enable end of the positive voltage DC-DC chip U1); the output terminal of the controllable switch unit 100 is grounded, and the control terminal of the controllable switch unit 100 is electrically connected to an enable controller (not numbered in fig. 1) of the negative voltage power supply module 500.

It should be noted that, in this embodiment, the first power source V1 is a power source of +12V, the second power source V2 may be a power source corresponding to +12V, and the second power source V2 may also be a power source having a voltage corresponding to a set voltage value of an enable signal for enabling the negative voltage power module 500 to be powered on, for example, may be-11V.

Through the enabling control circuit of the negative-pressure power supply module, the problem that when a positive-pressure DC-DC chip is adopted for negative-pressure output in the related art, the starting or closing of the positive-pressure DC-DC chip cannot be normally controlled by using a conventional positive-pressure control signal is solved, and the control of the power-on and power-off of the negative-pressure power supply by using a common IO port signal is realized.

In this embodiment, when the enable control circuit of the negative voltage power supply module enables the negative voltage power supply module 500 to power on: the enable controller outputs a power-on signal for controlling the power-on of the negative voltage power module 500 (at this time, the power-on signal is at a high level), the control end of the controllable switch unit 100 communicates the input end of the controllable switch unit 100 with the output end of the controllable switch unit 100 after receiving the power-on signal, at this time, the primary side circuit 201 of the isolation conversion unit 200 is relatively conducted and triggers the secondary side circuit 202 of the isolation conversion unit 200 to be conducted, the secondary side circuit 202 of the isolation conversion unit 200 converts the voltage of the second power source V2 into a corresponding enable signal, and the negative voltage power module 500 is powered on and outputs-12V along the negative voltage output end (corresponding to the ground end of the positive voltage DC-DC chip U1).

In this embodiment, when the enable control circuit of the negative voltage power supply module enables the negative voltage power supply module 500 to be powered off, the power-on signal output by the enable controller is at a low level, the controllable switch unit 200 does not operate, the primary circuit 201 of the isolation conversion unit 200 is disconnected, and the negative voltage power supply module 001 does not output power.

Fig. 2 is a topology diagram of an enable control circuit of the negative voltage power supply module according to a preferred embodiment of the present application, as shown in fig. 2, in some optional embodiments, the controllable switch unit 100 includes an insulated gate field effect transistor circuit, where the insulated gate field effect transistor circuit includes an insulated gate field effect transistor Q1 and a first resistor R1, where a drain of the insulated gate field effect transistor Q1 serves as an input terminal of the controllable switch unit 100, a source serves as an output terminal of the controllable switch unit 100, and a gate serves as a control terminal of the controllable switch unit 100; one end of the first resistor R1 is electrically connected to the gate, and the other end is grounded.

In this embodiment, the insulated gate field effect transistor Q1 is preferably an enhancement mode N-channel insulated gate field effect transistor.

When the enable control circuit of the negative voltage power supply module of this embodiment enables the negative voltage power supply module 500 to power up: the enable controller outputs a power-up signal (refer to PON _ CTRL in fig. 2, at this time, the power-up signal is at a high level) for controlling the power-up of the negative voltage power module 500, and after the gate of the igbt Q1 receives the power-up signal, the igbt Q1 is turned on; when the enable control circuit of the negative voltage power supply module enables the negative voltage power supply 500 to be powered off, the power-on signal output by the enable controller is at a low level, and the insulated gate field effect transistor Q1 is turned off after the gate of the insulated gate field effect transistor Q1 receives the power-on signal.

It should be noted that, in the embodiment of the present application, the controllable switch unit 100 includes, but is not limited to, an insulated gate field effect transistor, for example: the controllable switching unit 100 may also be a triode. Furthermore, according to the disclosure of the present application, it is easy for a person skilled in the art to modify the controllable switch unit 200 disclosed in the present application into a controllable switch unit 200 adapted to a triode or a field effect transistor according to a specific type of the triode or the field effect transistor, so that the present application can be implemented whether the controllable switch unit 100 is a triode of NPN type or PNP type, or a field effect transistor of N channel or P channel, and the present application is not limited in the embodiments.

Of course, when the controllable switch unit 100 selects a transistor, the base of the transistor is connected to the enable controller through a resistor connected in series.

In this embodiment, since the gate of the igbt Q1 is floating when the power-up signal (refer to PON _ CTRL in fig. 2) output by the enable controller is 0, in order to keep the igbt Q1 in the off state, the gate of the igbt Q1 is also electrically connected to the source thereof through the first resistor R1, that is, the gate of the igbt Q1 is pulled down to the ground, so as to ensure that the igbt Q1 is turned off, the isolation conversion unit 200 does not output the enable signal, and the negative voltage power module 001 does not output any output.

Fig. 3 is a second topology diagram of an enable control circuit of the negative voltage power supply module according to the preferred embodiment of the present application, as shown in fig. 3, in some embodiments, the isolation conversion unit 200 includes an optical coupler U2; the primary side circuit of the optocoupler U2 includes a light emitting diode; the anode of the light emitting diode is electrically connected with the first power supply V1, and the cathode of the light emitting diode is electrically connected with the input end of the controllable switch unit 100; the secondary side circuit of the optical coupler comprises a photosensitive diode; the photodiode is connected in series between the second power supply V2 and the enable terminal of the negative voltage power supply module 500.

It should be noted that the optical coupler U2 in the embodiment of the present application includes, but is not limited to, one of the following: a PC817 optical coupler, a PC111 optical coupler and a TLP521 optical coupler.

In this embodiment, when the enable controller outputs a power-up signal (refer to PON _ CTRL in fig. 3, which is at a high level), the control terminal of the controllable switch unit 100 receives the power-up signal, the input of the controllable switching unit 100 is connected to the output of the controllable switching unit 100, which, at this time, the cathode of the light emitting diode is grounded and conducted to emit light and generate a light trigger signal, the photosensitive diode is conducted when receiving the light trigger signal, therefore, the voltage of the second power source V2 is connected to the enable terminal of the negative voltage power module 500 (in practice, the voltage received by the enable terminal is the difference between the voltage of the second power source V2 and the conduction voltage of the photodiode), and the enable terminal of the negative voltage power module 500 is powered on to operate after receiving the enable signal and outputs-12V along the negative voltage output terminal (corresponding to the ground terminal of the positive voltage DC-DC chip U1).

In some embodiments, the enable control circuit of the negative power supply module further includes a voltage regulating unit 300, wherein the voltage regulating unit 300 is connected in series between the second power supply V2 and the enable terminal of the negative power supply module 500; the voltage regulating unit 300 is powered up and down under the on-off control of the secondary side circuit 202 of the isolation conversion unit 200, and the second power supply V2 can be regulated to the enabling voltage required by the enabling end of the negative voltage power supply module 500 when the voltage regulating unit 300 is powered up.

In this embodiment, the voltage adjustment unit 300 is powered on or powered off, that is, when the secondary circuit 202 of the isolation conversion unit 200 forms a conducting loop, the voltage of the second power source V2 is switched into the circuit corresponding to the voltage adjustment unit 300, and the voltage adjustment unit 300 processes the voltage of the second power source V2, for example: the voltage is divided, so that the voltage of the second power source V2 is adjusted to the enable voltage required by the enable terminal of the negative voltage power module 500.

Fig. 4 is a third topological structure diagram of an enable control circuit of the negative voltage power supply module according to a preferred embodiment of the present application, and as shown in fig. 4, the voltage regulating unit 300 includes a second resistor R2 and a third resistor R3, wherein the second resistor R2, the secondary side circuit 202 of the isolation converting unit 200 and the third resistor R3 are connected in series between the second power supply V2 and a negative voltage output terminal (corresponding to-12V in fig. 4) of the negative voltage power supply module 001, the output terminal of the voltage regulating unit 300 is located between the second resistor R2 and the third resistor R3, and the output terminal of the voltage regulating unit 300 is electrically connected to the enable terminal of the negative voltage power supply module 500; as shown in fig. 4, in the present embodiment, the second resistor R2, the secondary side circuit 202 of the isolation converting unit 200, and the third resistor R3 are sequentially connected in series in the following order: the secondary circuit 202, the second resistor R2 and the third resistor R3 of the isolation conversion unit 200 are isolated, and at this time, the output end of the voltage regulation unit 300 corresponds to an electrical connection point of the second resistor R2 and the third resistor R3; when the secondary circuit 202 of the isolation conversion unit 200 is turned on, the second power source V2 is inputted into a circuit loop formed by the secondary circuit 202 of the isolation conversion unit 200, the second resistor R2 and the third resistor R3, and the voltage dividing circuit formed by the second resistor R2 and the third resistor R3 divides the voltage provided by the second power source V2 into the enabling voltage of the negative power module 500 (the voltage drop generated by the secondary circuit 200 of the isolation conversion unit 200 is negligible).

Fig. 5 is a topology structure diagram of an enable control circuit of the negative voltage power supply module according to a preferred embodiment of the present application, as shown in fig. 5, the voltage regulating unit 300 includes a second resistor R2 and a third resistor R3, wherein the second resistor R2, the secondary side circuit 202 of the isolation converting unit 200 and the third resistor R3 are connected in series between a second power supply V2 and a negative voltage output terminal (corresponding to-12V in fig. 5) of the negative voltage power supply module 500, an output terminal of the voltage regulating unit 300 is located between the second resistor R2 and the third resistor R3, and an output terminal of the voltage regulating unit 300 is electrically connected to an enable terminal of the negative voltage power supply module 500; as shown in fig. 5, in the present embodiment, the second resistor R2, the secondary side circuit 202 of the isolation converting unit 200, and the third resistor R3 are sequentially connected in series in the following order: the second resistor R2, the secondary side circuit 202 of the isolation conversion unit 200, and the third resistor R3, at this time, the output end of the voltage regulation unit 300 corresponds to the electrical connection point between the secondary side circuit 202 of the isolation conversion unit 200 and the third resistor R3; meanwhile, the second power V2 is inputted into a circuit loop formed by the secondary circuit 202, the second resistor R2 and the third resistor R3 of the isolation conversion unit 200, and the voltage dividing circuit formed by the second resistor R2 and the third resistor R3 divides the voltage provided by the second power V2 into the enabling voltage of the negative power module 500 (here, the voltage drop generated by the secondary circuit 200 of the isolation conversion unit 200 is ignored). In the present embodiment, the second resistor R2 is also used to pull up the secondary side circuit 202 of the isolated switching cell 200 relative to the input terminal connected to the second power source V2.

When the second resistor R2, the secondary side circuit 202 of the isolation conversion unit 200, and the third resistor R3 are connected in series, the position of the secondary side circuit 202 of the isolation conversion unit 200 is not limited, and the positions of the secondary side circuit 202 of the isolation conversion unit 200 include, but are not limited to: the second resistor R2 is connected in series with the third resistor R3 at two ends (refer to fig. 4), and between the second resistor R2 and the third resistor R3 (refer to fig. 5).

Fig. 6 is a fifth topological structure diagram of an enable control circuit of the negative voltage power supply module according to a preferred embodiment of the present application, and as shown in fig. 6, the enable control circuit of the negative voltage power supply module further includes a voltage stabilizing unit 400, and the voltage stabilizing unit 400 is connected in series between a negative voltage output terminal (corresponding to-12V in fig. 6) and an enable terminal of the negative voltage power supply module 500; in the present embodiment, the voltage stabilizing unit 400 is configured to stabilize the enabling voltage of the voltage conversion of the second power source V2 within the first setting voltage range by the secondary side circuit 202 of the isolation converting unit 200, and in the present embodiment, the enabling voltage is stabilized by the voltage stabilizing unit 400 to be not more than the first setting voltage (in the present embodiment, the enabling voltage is a voltage with respect to-12V, the first setting voltage is set to be a voltage difference of the third resistor R3 with respect to-12V, and a voltage difference between two ends of the third resistor R3 is set to be not more than 3.3V), so as to avoid that the enabling voltage exceeds the voltage input range of the positive voltage DC-DC chip U1 enabling end of the negative voltage power module 500 in an abnormal condition, and to avoid that the positive voltage DC-DC chip U1 is damaged.

Referring to fig. 6, in some embodiments, the voltage regulator unit 400 includes a voltage regulator tube D1, a positive electrode of the voltage regulator tube D1 is electrically connected to the negative voltage output terminal of the negative voltage power module 001, a negative electrode of the voltage regulator tube D1 is electrically connected to an enable terminal of the negative voltage power module 500, and in this embodiment, the voltage regulator tube D1 is further connected in parallel to the third resistor R3

It should be noted that the zener diode D1 in the embodiment of the present application includes, but is not limited to, a zener diode. Meanwhile, when the secondary side circuit 202 of the isolation conversion unit 200 does not output, that is, when the enable end of the negative voltage power module 001 is at a low level, if the third resistor R3 does not exist, because the enable end of the negative voltage power module 500 corresponds to the enable end of the positive voltage DC-DC chip U1, the enable end of the positive voltage DC-DC chip U1 has a current flowing out, the current enters the ground through the voltage regulator tube D1, the electrical connection point between the secondary side circuit 202 of the isolation conversion unit 200 and the enable end of the negative voltage power module 500 will always maintain at a high level, thereby causing abnormal enabling of the negative voltage power module 500, when the enable control circuit of the negative voltage power module enables power, the negative voltage power module 500 will also output, when the third resistor R3 exists, the current flowing out from the enable end of the positive voltage DC-DC chip U1 will leak through the third resistor R3, so that the electrical connection point between the secondary side circuit 202 of the isolation conversion unit 200 and the enable end of the negative voltage power module 500 is maintained at a low level At a normal level (high level or low level), the negative power module 500 is powered up and down normally.

Referring to fig. 6, in some embodiments, the enable control circuit of the negative voltage power supply module further includes a fourth resistor R4, the fourth resistor R4 is connected in series between the first power supply V1 and the primary circuit 201 of the isolation conversion unit 200, and the fourth resistor R4 is configured to limit a current input to the primary circuit 201 of the isolation conversion unit 200 and pull up an input terminal of the primary circuit 201 to the first power supply V1.

Referring to fig. 6, the following describes the operation process of the enable control circuit of the negative voltage power module according to the embodiment of the present application as follows:

the optocoupler U2 is a FETMOS, and the light emitting diode of the optocoupler U2 emits light to make the photosensitive diode of the optocoupler U2 conductive.

When the power-on signal PON _ CTRL output by the enable controller is 0, the insulated gate field effect transistor Q1 is turned off, the light emitting diode of the optocoupler U2 has no current, two pins of the photodiode of the optocoupler U2 are disconnected, and the enable terminal of the negative voltage power supply module 500 is pulled down through the third resistor R3, so that no output of the negative voltage power supply module 500 is ensured.

When a power-on signal PON _ CTRL output by the enable controller is 1, the insulated gate field effect transistor Q1 is turned on, the light emitting diode of the optocoupler U2 has current and emits light, the photodiode of the optocoupler U2 is turned on, and voltage is divided by the second resistor R2 and the third resistor R3, so that the voltage value of the enable voltage relative to the negative voltage output terminal of the negative voltage power supply module 500 is greater than the minimum enable voltage of the positive voltage DC-DC chip U1, and at this time, the negative voltage power supply module 500 outputs-12V (corresponding to the ground terminal of the positive voltage DC-DC chip U1).

The embodiment of the application also provides a negative-pressure power supply, which comprises a negative-pressure power supply module and the enabling control circuit of the negative-pressure power supply module.

In some embodiments, referring to fig. 6, the negative voltage power supply module includes a positive voltage DC-DC chip U1, the positive voltage DC-DC chip U1 including an input terminal, an output terminal, a ground terminal, and an enable terminal; the input end of the positive voltage DC-DC chip U1 is electrically connected to a third power supply (in this embodiment, the third power supply is a +12V power supply), the output end of the positive voltage DC-DC chip U1 is grounded, the enable end of the positive voltage DC-DC chip U1 serves as the enable end of the negative voltage power supply module, and the ground end of the positive voltage DC-DC chip U1 serves as the negative voltage output end of the negative voltage power supply module.

Compared with the related art, the enabling control circuit and the negative power supply of the negative voltage power supply module provided by the embodiment of the application use the positive voltage DC-DC chip grounding end to output negative voltage, and the positive voltage DC-DC chip end output end is grounded to obtain a negative voltage power supply, and the control of the up and down electricity of the negative voltage power supply by using a common IO port signal is realized through the controllable switch unit and the isolation conversion unit; meanwhile, the isolation conversion unit isolates the negative-pressure power supply and the enabling controller, and the voltage stabilizing unit is used for protecting the positive-pressure DC-DC chip, so that the device is effectively prevented from being damaged. By the aid of the method and the device, the problem that when the positive-voltage DC-DC chip is adopted to output negative voltage in the related art, the positive-voltage DC-DC chip cannot be normally controlled to be started or closed by using a conventional positive-voltage control signal is solved.

It should be understood by those skilled in the art that various features of the above-described embodiments can be combined in any combination, and for the sake of brevity, all possible combinations of features in the above-described embodiments are not described in detail, but rather, all combinations of features which are not inconsistent with each other should be construed as being within the scope of the present disclosure.

The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. The enabling control circuit of the negative-pressure power supply module is characterized by comprising a controllable switch unit and an isolation conversion unit; the primary side circuit of the isolation conversion unit is connected in series between a first power supply and the input end of the controllable switch unit, and the secondary side circuit of the isolation conversion unit is connected in series between a second power supply and the enabling end of the negative-pressure power supply module; the output end of the controllable switch unit is grounded, and the control end of the controllable switch unit is electrically connected with the enabling controller of the negative-pressure power supply module.

2. The enabling control circuit of the negative voltage power supply module according to claim 1, wherein the controllable switch unit comprises an insulated gate field effect transistor circuit, wherein the insulated gate field effect transistor circuit comprises an insulated gate field effect transistor and a first resistor, wherein a drain of the insulated gate field effect transistor serves as an input terminal of the controllable switch unit, a source of the insulated gate field effect transistor serves as an output terminal of the controllable switch unit, and a gate of the insulated gate field effect transistor serves as a control terminal of the controllable switch unit; one end of the first resistor is electrically connected with the grid electrode, and the other end of the first resistor is grounded.

3. The enable control circuit of a negative voltage power supply module according to claim 2, wherein the insulated gate field effect transistor is an enhanced N-channel insulated gate field effect transistor.

4. The enable control circuit of the negative-voltage power supply module according to claim 1, wherein the isolation conversion unit includes an optocoupler; the primary side circuit of the optical coupler comprises a light emitting diode; the anode of the light emitting diode is electrically connected with the first power supply, and the cathode of the light emitting diode is electrically connected with the input end of the controllable switch unit; the secondary side circuit of the optical coupler comprises a photosensitive diode; the photosensitive diode is connected in series between the second power supply and the enabling end of the negative-pressure power supply module.

5. The enable control circuit of the negative power supply module according to claim 1, further comprising a voltage regulating unit connected in series between the second power supply and the enable terminal of the negative power supply module; the voltage adjusting unit is controlled by the on-off of the secondary side circuit of the isolation conversion unit to be powered up and down, and the second power supply can be adjusted to enable voltage required by an enabling end of the negative-voltage power supply module under the condition that the voltage adjusting unit is powered on.

6. The enable control circuit of the negative voltage power supply module according to claim 5, wherein the voltage regulating unit comprises a second resistor and a third resistor, wherein the second resistor, the secondary side circuit of the isolation conversion unit and the third resistor are connected in series between the second power supply and the negative voltage output terminal of the negative voltage power supply module, the output terminal of the voltage regulating unit is located between the second resistor and the third resistor, and the output terminal of the voltage regulating unit is electrically connected to the enable terminal of the negative voltage power supply module.

7. The enable control circuit of the negative-voltage power supply module according to claim 1, further comprising a voltage stabilizing unit connected in series between the negative-voltage output terminal and the enable terminal of the negative-voltage power supply module.

8. The enable control circuit of the negative-pressure power supply module according to claim 7, wherein the voltage stabilizing unit comprises a voltage stabilizing tube, the positive electrode of the voltage stabilizing tube is electrically connected with the negative-pressure output end of the negative-pressure power supply module, and the negative electrode of the voltage stabilizing tube is electrically connected with the enable end of the negative-pressure power supply module.

9. The negative power supply module enabling control circuit according to claim 1, further comprising a fourth resistor connected in series between the first power supply and the primary circuit of the isolation conversion unit.

10. A negative-voltage power supply, characterized in that the negative-voltage power supply comprises a negative-voltage power supply module and an enable control circuit of the negative-voltage power supply module according to any one of claims 1 to 9.

11. The negative voltage power supply of claim 10, wherein the negative voltage power supply module comprises a positive voltage DC-DC chip comprising an input terminal, an output terminal, a ground terminal, and an enable terminal; the input end of the positive-voltage DC-DC chip is electrically connected with a third power supply, the output end of the positive-voltage DC-DC chip is grounded, the enable end of the positive-voltage DC-DC chip is used as the enable end of the negative-voltage power supply module, and the ground end of the positive-voltage DC-DC chip is used as the negative-voltage output end of the negative-voltage power supply module.