CN114442723B - Circuit for correcting and automatically controlling standby power supply and protecting cascade signal voltage difference - Google Patents

Circuit for correcting and automatically controlling standby power supply and protecting cascade signal voltage difference Download PDF

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Publication number
CN114442723B
CN114442723B CN202210135380.4A CN202210135380A CN114442723B CN 114442723 B CN114442723 B CN 114442723B CN 202210135380 A CN202210135380 A CN 202210135380A CN 114442723 B CN114442723 B CN 114442723B
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power supply
slave
circuit
resistor
standby power
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CN114442723A (en
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杨文鑫
刘旭东
董飞青
李亚峰
梁鸿宇
张斌
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Yunmai Shanghai Internet Of Things Technology Co ltd
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Yunmai Shanghai Internet Of Things Technology Co ltd
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    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
    • G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
    • G05F1/10—Regulating voltage or current
    • G05F1/625—Regulating voltage or current wherein it is irrelevant whether the variable actually regulated is ac or dc
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
    • H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
    • H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
    • H02J9/061—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems for DC powered loads
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
    • H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
    • H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
    • H02J9/068—Electronic means for switching from one power supply to another power supply, e.g. to avoid parallel connection
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
    • Y04S20/20—End-user application control systems

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Automation & Control Theory (AREA)
  • Direct Current Feeding And Distribution (AREA)

Abstract

The invention discloses a cascade signal differential pressure correction and automatic control standby power supply and protection circuit, which comprises a host, a connecting wire and slaves, wherein the host is connected with a first slave 'IN' input interface through the connecting wire, each slave 'OUT' output interface is connected with a next slave 'IN' input interface, and a plurality of slaves are cascaded IN sequence; the slave comprises an automatic control standby power supply circuit, a unidirectional power supply and current limiting device circuit. Compared with the prior art, the invention has the advantages that: the invention can solve the problem of analog signal transmission pressure difference caused by power voltage errors between two adjacent devices by a self-control standby power supply on-off mode, and improves the cascading accuracy of analog signals.

Description

Circuit for correcting and automatically controlling standby power supply and protecting cascade signal voltage difference
Technical Field
The invention relates to a cascade circuit, in particular to a cascade signal voltage difference correction and automatic control standby power supply and protection circuit.
Background
The analog signal cascading technology can realize that one host computer controls a plurality of slave computers, and the slave computers at the upper stage or the host computers provide standby power for the slave computers at the lower stage, so that the problem that signals cannot be continuously transmitted due to power failure of the slave computers is well solved. The current limiting protection solves the problem that when a certain slave power supply is short-circuited, the slave or the master at the upper stage can automatically disconnect standby power supply, and the fault elimination can automatically open.
In the existing analog signal cascade transmission, under the condition that upper and lower stages mutually provide standby power supply, the analog signals have larger voltage difference due to different power supply voltages of adjacent slaves, and the signal voltage precision is affected. If one of the slave power supplies or connecting wires is short-circuited, the fault of the whole chain cascading equipment can be influenced, and potential safety hazards exist.
Therefore, developing a circuit for correcting and automatically controlling standby power supply and protection by cascade signal voltage difference becomes a problem to be solved by those skilled in the art.
Disclosure of Invention
The invention aims to solve the problems that in the prior art, when the upper and lower stages mutually provide standby power supply, the analog signal cascade transmission has larger pressure difference due to different power supply voltages of adjacent slaves and the slave or master is in standby power supply output protection.
The above object of the present invention is achieved by the following technical solutions: a circuit for correcting and automatically controlling a standby power supply and protecting cascade signal differential pressure comprises a host, connecting wires and slaves, wherein the host is connected with an input interface of a first slave 'IN', an output interface of each slave 'OUT' is connected with an input interface of a next slave 'IN', and a plurality of slave devices are cascaded IN sequence.
Further, the slave comprises an automatic control standby power supply circuit, a unidirectional power supply and current limiting device circuit.
Further, the self-control standby power supply circuit comprises resistors R1, R2, R3, R4, R5, R6, R7 and R8, a field effect transistor Q1, triodes Q2 and Q3 and a diode D3, wherein a slave power supply control switch is used for starting the standby power supply only when the slave power supply fails, and the last-stage slave or master provides standby power supply. The standby power supply in a normal state is in a closed state, and the common ground wire between adjacent slaves has little current due to extremely small driving current of the analog signals, and the two ends of the common ground wire have no relative voltage difference, so that the voltages of the output end and the receiving end of the analog signals are almost consistent.
The principle of the method is that when adjacent slaves are different in power supply voltage, the voltage of the slave of the upper stage is higher than that of the slave of the lower stage, and as the voltage of the slave of the upper stage is higher, the slave of the lower stage can be powered, a larger current flows between the two slaves, a larger pressure difference can occur at two ends of a common ground, and if the two ends of the common ground are V △ The output signal voltage of the slave machine at the upper stage is V, the ground line end of the slave machine at the upper stage is zero potential, and the ground line end potential of the slave machine at the lower stage is V △ The voltage when the signal is transmitted to the next slave is V-V △ . When the slave voltage of the upper stage is lower than the slave power supply voltage of the lower stage, the potential of the bottom line end of the slave of the lower stage is-V △ The voltage when the signal is transmitted to the next slave is V+V △ . The direct provision of a standby power scheme by the upper and lower slaves increases the signal cascade voltage error. The problem can be well solved in a self-control standby power circuit and a unidirectional power supply and current limiting device circuit. Because the standby power supply in the normal state is in the off state, the one-way power supply cuts off the power supply of the next-stage slave machine to the last-stage slave machine, and V is the moment △ Almost 0, the voltage when the signal is transmitted from the slave of the upper stage to the slave of the lower stage is still the output voltage V of the slave of the upper stage, so that the problem is solved.
In the self-control standby power supply circuit, a field effect tube Q1 plays a role of a switch, the source electrode of the field effect tube Q1 is connected with resistors R1 and R2 and an input power supply 'VIN', the drain electrode of the field effect tube Q1 is connected with a slave communication function circuit working power supply 'VA', and the grid electrode of the field effect tube Q1 is connected with resistors R2 and R3. The triodes Q2 and Q3 are NPN triodes, and the field effect transistor Q1 is of a P channel type; the collector of the triode Q2 is connected with a current limiting resistor R3, the emitter is connected with a resistor R6, the resistors R1 and R5 form a voltage dividing circuit, and the divided intermediate voltage is connected with the base electrode of the triode Q2; the collector of the triode Q3 is connected with the base of the triode Q2 to control the on-off of the triode Q2, the resistor R4 is a current limiting resistor, the base of the triode Q3 is connected with the resistor R4, the emitter is connected with the resistor R7, the resistor R8 is a pull-down resistor, and the resistor R4 and GND are connected; the resistor R2 is a pull-up resistor and is connected with a power supply and the grid electrode of the field effect transistor Q1; diode D3 acts as a reverse conduction to power the slave "IN" input interface to the outside standby. When the control voltage "VDC" is at high potential, the triode Q3 is conducted, the base level of the triode Q2 is pulled down, the triode Q2 is in a closed state, the grid electrode and the source electrode of the field effect tube Q1 are equal in potential, the field effect tube Q1 is in a closed state, and the standby power supply is not started at the moment. When the control voltage "VDC" is at low potential, the triode Q3 is in a closed state, the base level of the triode Q2 is at high level, the triode Q2 is conducted, the grid electrode and the source electrode of the field effect tube Q1 are in potential difference, the field effect tube Q1 is in a conducting state, and the standby power supply is started at the moment.
Further, the unidirectional power supply and current limiting device circuit comprises diodes D1 and D2 and a recoverable fuse F1, wherein the diode D1 plays a role in single conduction to prevent reverse power supply, the anode of the diode D1 is connected with a working power supply 'VA' of a slave communication function circuit, the cathode of the diode D1 is connected with the recoverable fuse F1, and the recoverable fuse F1 is connected with an output power supply 'VOUT'; the anode of the diode D2 is connected with the power supply 'V+', and the cathode of the diode D is connected with the working power supply 'VA' of the communication function circuit of the slave; only the slave of the upper stage supplies power to the slave of the lower stage between the adjacent slaves, and the slave of the lower stage does not provide a standby power supply for the slave of the upper stage due to the unidirectional conduction effect of the diode D1, so that the fuse F1 can be restored to have the current limiting protection effect; diode D2 prevents the backup power from being supplied back to the slave power supply; the diodes D1 and D2 play a role in unidirectional conduction, and the recoverable fuse F1 plays a role in current limiting protection.
When the slave machine works, the slave machine is electrified to turn off the standby power supply from the slave machine or the master machine at the upper stage to the slave machine by default; if the slave power supply fails, the standby power supply can be automatically turned on, and the slave or the master at the upper stage supplies power; if the current is too large due to the short circuit of the slave or the line, the recoverable fuse F1 of the slave or the master of the upper stage can be automatically disconnected, so that the protection is not affected. The slave of the next stage does not provide standby power for the slave or the master of the previous stage.
The circuit is designed with a standby power supply self-control switch added to each slave, and is controlled by a power supply signal of the slave, and the standby power supply is started when the power supply of the slave fails, and the standby power supply is provided by the slave or the host at the upper stage, and is closed in a normal state. Each slave or master is provided with a recoverable fuse at the standby power supply output end of the slave at the next stage to prevent the excessive current from influencing the normal operation of the master or slave.
Compared with the prior art, the invention has the advantages that: the invention can solve the problem of analog signal transmission pressure difference caused by power voltage errors between two adjacent devices by a self-control standby power supply on-off mode, and improves the cascading accuracy of analog signals.
Drawings
Fig. 1 is a wiring diagram of the present invention.
Fig. 2 is a functional block diagram of the present invention.
Fig. 3 is a schematic circuit diagram of the present invention.
Detailed Description
The invention is further described in detail below with reference to the accompanying drawings.
As shown in figure 1, the cascade signal differential pressure correction and automatic control standby power supply and protection circuit is applied to a cascade signal system, and the cascade signal differential pressure correction scheme can solve the problem of signal differential pressure when a host computer is transmitted to a slave computer and the slave computer is transmitted to the slave computer, improves the signal cascade precision and provides automatic control standby power supply and protection.
The invention provides a cascade signal differential pressure correction and automatic control standby power supply and protection circuit, which comprises a host, a connecting wire and slaves, wherein the host is connected with a first slave 'IN' input interface through the connecting wire, each slave 'OUT' output interface is connected with a next slave 'IN' input interface, and a plurality of slaves are sequentially cascaded. The connection part is shown IN fig. 1 and comprises an input end 'IN' and an output end 'OUT', wherein the host is connected with an input interface of a first slave machine 'IN', and the output end interface of each slave machine 'OUT' is connected with an input interface of the next slave machine 'IN' IN turn IN cascade connection.
As shown in figure 2, the slave power supply supplies power to the slave unit, the slave standby power supply does not reversely supply power to the slave unit, the power supply signal in the slave unit circuit controls the standby power supply switch, the slave communication function circuit power supply supplies standby power to the slave unit at the next stage in one way through current limiting protection, and the slave unit at the next stage does not supply standby power to the slave unit at the previous stage due to the one-way power supply.
Further, the slave comprises an automatic control standby power supply circuit, a communication function circuit and a unidirectional power supply and current limiting device circuit.
Further, the self-control standby power circuit comprises resistors R1, R2, R3, R4, R5, R6, R7 and R8, a field effect transistor Q1, triodes Q2 and Q3 and a diode D3. The invention is that the slave power supply control switch can only start the standby power supply when the slave power supply fails, and the standby power supply is provided by the slave or the host at the upper stage. The standby power supply in a normal state is in a closed state, and the common ground wire between adjacent slaves has little current due to extremely small driving current of the analog signals, and the two ends of the common ground wire have no relative voltage difference, so that the voltages of the output end and the receiving end of the analog signals are almost consistent.
In the self-control standby power supply circuit, a field effect tube Q1 plays a role of a switch, the source electrode of the field effect tube Q1 is connected with resistors R1 and R2 and an input power supply 'VIN', the drain electrode of the field effect tube Q1 is connected with a slave communication function circuit working power supply 'VA', and the grid electrode of the field effect tube Q1 is connected with resistors R2 and R3. The triodes Q2 and Q3 are NPN triodes, and the field effect transistor Q1 is of a P channel type; the collector of the triode Q2 is connected with a current limiting resistor R3, the emitter is connected with a resistor R6, the resistors R1 and R5 form a voltage dividing circuit, and the divided intermediate voltage is connected with the base electrode of the triode Q2; the collector of the triode Q3 is connected with the base of the triode Q2 to control the on-off of the triode Q2, the resistor R4 is a current limiting resistor, the base of the triode Q3 is connected with the resistor R4, the emitter is connected with the resistor R7, the resistor R8 is a pull-down resistor, and the resistor R4 and GND are connected; the resistor R2 is a pull-up resistor and is connected with a power supply and the grid electrode of the field effect transistor Q1; diode D3 acts as a reverse conduction to power the slave "IN" input interface to the outside standby. When the control voltage "VDC" is at high potential, the triode Q3 is conducted, the base level of the triode Q2 is pulled down, the triode Q2 is in a closed state, the grid electrode and the source electrode of the field effect tube Q1 are equal in potential, the field effect tube Q1 is in a closed state, and the standby power supply is not started at the moment. When the control voltage "VDC" is at low potential, the triode Q3 is in a closed state, the base level of the triode Q2 is at high level, the triode Q2 is conducted, the grid electrode and the source electrode of the field effect tube Q1 are in potential difference, the field effect tube Q1 is in a conducting state, and the standby power supply is started at the moment.
The unidirectional power supply and current limiting device circuit comprises diodes D1 and D2 and a recoverable fuse F1, wherein the diode D1 plays a role in single conduction to prevent reverse power supply, the anode of the diode D1 is connected with a working power supply 'VA' of a slave communication function circuit, the cathode of the diode D1 is connected with the recoverable fuse F1, and the recoverable fuse F1 is connected with an output power supply 'VOUT'; the anode of the diode D2 is connected with the power supply 'V+', and the cathode of the diode D is connected with the working power supply 'VA' of the communication function circuit of the slave; only the slave of the upper stage supplies power to the slave of the lower stage between the adjacent slaves, and the slave of the lower stage does not provide a standby power supply for the slave of the upper stage due to the unidirectional conduction effect of the diode D1, so that the fuse F1 can be restored to have the current limiting protection effect; diode D2 prevents the backup power from being supplied back to the slave power supply; the diodes D1 and D2 play a role in unidirectional conduction, and the recoverable fuse F1 plays a role in current limiting protection.
As shown in FIG. 3, the control voltage "VDC" is connected with the current-limiting resistor R4 to control the base electrode of the triode Q3, the collector electrode of the triode Q3 is connected with the base electrode of the triode Q2, and the collector electrode of the triode Q2 is connected with the grid electrode of the field effect transistor Q1. Under the normal state, the control voltage VDC is in high potential, the triode Q3 is conducted, the base level of the triode Q2 is pulled down, the triode Q2 is in a closed state, the grid electrode of the field effect tube Q1 is equal to the source potential, the field effect tube Q1 is in a closed state, a standby power supply is not started at the moment, the slave machine at the next stage is powered on for the slave machine at the last stage in a unidirectional mode, the voltage difference at the two ends of the common ground wire of the adjacent slave machine is almost 0, and the output signal of the slave machine at the last stage and the received signal voltage of the slave machine at the next stage are kept consistent. When the slave machine has power failure, the control voltage VDC is in low potential, the triode Q3 is in a closed state, the base level of the triode Q2 is in high level, the triode Q2 is conducted, the grid electrode and the source electrode of the field effect tube Q1 are in potential difference, the field effect tube Q1 is in a conducting state, a standby power supply is started at the moment, and the master machine or the slave machine provides power for the next-stage slave machine, so that the whole functional system is ensured to be in a normal working state.
IN the embodiment of the invention, the host is connected with a first slave machine through a connecting wire, and each slave machine is connected with the IN input end interface of the next slave machine IN cascade sequentially through the OUT output end interface. The slave power supply is powered by the normal standby power supply in a closed state, and the standby power supply is started when the slave power supply fails.
The foregoing description is only illustrative of the present invention and is not intended to limit the scope of the invention, and all equivalent structures or equivalent processes or direct or indirect application in other related technical fields are included in the scope of the present invention.

Claims (2)

1. A cascade signal differential pressure correction, automatic control standby power supply and protection circuit is characterized by comprising a host, a connecting wire and slaves, wherein the host is connected with a first slave 'IN' input interface through the connecting wire, each slave 'OUT' output interface is connected with a next slave 'IN' input interface, and a plurality of slave devices are cascaded IN sequence; the slave comprises an automatic control standby power supply circuit, a unidirectional power supply and current limiting device circuit; the automatic control standby power supply circuit is used for controlling the on-off of a standby power supply which is transmitted from an upper-level slave machine or a host machine; the unidirectional power supply and current limiting device circuit is used for unidirectional conduction and preventing reverse power supply; the current limiting device plays a role in limiting current, and prevents overlarge current caused by accidental short circuit or fault; the self-control standby power supply circuit comprises resistors R1, R2, R3, R4, R5, R6, R7 and R8, a field effect transistor Q1, triodes Q2 and Q3 and a diode D3; in the self-control standby power supply circuit, a field effect tube Q1 plays a role of a switch, the source electrode of the field effect tube Q1 is connected with resistors R1 and R2 and an input power supply 'VIN', the drain electrode is connected with a working power supply 'VA' of a slave communication function circuit, and the grid electrode is connected with resistors R2 and R3; the triodes Q2 and Q3 are NPN triodes, and the field effect transistor Q1 is of a P channel type; the collector of the triode Q2 is connected with a current limiting resistor R3, the emitter is connected with a resistor R6, the resistors R1 and R5 form a voltage dividing circuit, and the divided intermediate voltage is connected with the base electrode of the triode Q2; the collector of the triode Q3 is connected with the base of the triode Q2 to control the on-off of the triode Q2, the resistor R4 is a current limiting resistor, the base of the triode Q3 is connected with the resistor R4, the emitter is connected with the resistor R7, the resistor R8 is a pull-down resistor, and the resistor R4 and GND are connected; the resistor R2 is a pull-up resistor and is connected with a power supply and the grid electrode of the field effect transistor Q1; diode D3 acts as a reverse conduction to power the slave "IN" input interface to the outside standby.
2. The circuit for correcting and automatically controlling standby power supply and protecting cascade signal voltage difference according to claim 1, wherein the unidirectional power supply and current limiting device circuit comprises diodes D1 and D2 and a recoverable fuse F1, wherein the diode D1 plays a role in single-phase conduction to prevent reverse power supply, the anode of the diode D1 is connected with a working power supply 'VA' of a slave communication function circuit, the cathode of the diode D1 is connected with the recoverable fuse F1, and the recoverable fuse F1 is connected with an output power supply 'VOUT'; the anode of the diode D2 is connected with the power supply 'V+', and the cathode of the diode D is connected with the working power supply 'VA' of the communication function circuit of the slave; only the slave of the upper stage supplies power to the slave of the lower stage between the adjacent slaves, and the slave of the lower stage does not provide a standby power supply for the slave of the upper stage due to the unidirectional conduction effect of the diode D1, so that the fuse F1 can be restored to have the current limiting protection effect; diode D2 prevents the backup power from being supplied back to the slave power supply; the diodes D1 and D2 play a role in unidirectional conduction, and the recoverable fuse F1 plays a role in current limiting protection.
CN202210135380.4A 2022-02-14 2022-02-14 Circuit for correcting and automatically controlling standby power supply and protecting cascade signal voltage difference Active CN114442723B (en)

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US9384108B2 (en) * 2012-12-04 2016-07-05 International Business Machines Corporation Functional built-in self test for a chip
CN106292343B (en) * 2015-05-19 2018-11-20 鸿富锦精密工业（深圳）有限公司 Power supply system of electronic device
CN206135414U (en) * 2016-10-25 2017-04-26 宁德时代新能源科技股份有限公司 Battery management system's redundant backup control circuit
CN108803431A (en) * 2018-07-09 2018-11-13 江苏恒宝智能系统技术有限公司 A kind of more equipment power supply management devices, connection method and system
CN109391277A (en) * 2018-12-10 2019-02-26 大山科技有限公司 A kind of cascade bus signal receiving circuit and control system
CN209526556U (en) * 2019-04-04 2019-10-22 江苏沁恒股份有限公司 Power supply switch circuit

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