CN219016933U - ESD (electro-static discharge) prevention address line of CRPS (common control point) power supply - Google Patents
ESD (electro-static discharge) prevention address line of CRPS (common control point) power supply Download PDFInfo
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Abstract
The utility model relates to the technical field of power supply circuits, in particular to a CRPS power supply ESD (electro-static discharge) prevention address line, which comprises an MCU (micro control Unit) module and an address signal module; the address signal module comprises a system control port, an address input port, an address output port and a power supply port; the address signal module also comprises a switch tube, a pull-up resistor R719 and an ESD (electrostatic discharge) prevention resistor R720; the control end of the switching tube is connected with a system control port; the power port is connected with one end of the pull-up resistor R719; the other end of the pull-up resistor R719 is connected with the switch end of the switch tube; the other end of the pull-up resistor R719 is connected with the address input port; the other end of the pull-up resistor R719 is connected with an address output port through an ESD (electro-static discharge) prevention resistor R720; and the address output port is connected with the MCU module. According to the utility model, when the address input port is at a low level, the ESD protection resistor R720 does not participate in voltage division, so that the resistance value of the ESD protection resistor R720 can be increased to play a role in ESD protection, and the MCU module can be prevented from being killed by ESD.
Description
Technical Field
The utility model relates to the technical field of power supply circuits, in particular to an anti-ESD address line of a CRPS power supply.
Background
CRPS power supplies are redundant in design and therefore typically require two or more parallel applications. When two or more systems are connected in parallel to supply power to the system, the system needs to decide to make one or more systems enter a sleep state or wake up from the sleep state in a mode of issuing instructions according to the condition of the load. If the corresponding power supply is to be put into a sleep mode or awakened, each power supply needs to be allocated an address, so that the system decides to put the power supply into the sleep state or awaken specifically according to the load. There is no strict anti-ESD rating requirement for CRPS power address signals. Because the signal PIN inserted in the system does not contact the outside when the PSU is actually used, but ESD problem exists when the signal PIN leaks during PSU production, a circuit with lower cost is generally used for protection.
Because of cost and space limitations, most CRPS power supplies use the ESD protection circuit shown in fig. 1, where 3.3V is the pull-up voltage, R661 is the pull-up resistor, D612 is the clamp diode, R662 is the ESD protection resistor, and C662 is the filter capacitor. A0 is an input address signal, and A0' is a signal which is transmitted to the MCU through the ESD-proof resistor. The system side operates A0 to be high or low by releasing or pulling A0 low through an open collector transistor. The MCU reads the corresponding address through the high and low of the two signal levels of A0 and A1. The problem with this line is that the input resistance (R662) cannot be too large because the pull-up resistance is typically at most 10Kohm, and R661 and R662 will form a voltage divider if A0 is low, where A0' is typically less than 0.3VDD low, about 1V. Because the actual power supply has noise in the use process, in order to prevent the MCU from misreading, many clients limit the low level range to below 0.4V. Because the triode conducting voltage is generally 0.2-0.3V, the value of R662 is generally 10-51 ohm, the resistance value is smaller, and a small amount of MCU is usually dead by ESD through the resistor R662 in the production process of the product. If the R662 resistance is amplified, then R662 and R661 will be divided when A0 is low, resulting in a high voltage at A0', which may cause the MCU to read A0' in error.
Disclosure of Invention
The utility model aims to overcome the defects in the prior art and provide an ESD (electronic static discharge) prevention address line for a CRPS (common voltage source) power supply, which can prevent an MCU (micro control Unit) module from being killed by ESD.
The aim of the utility model is achieved by the following technical scheme: a CRPS power supply ESD-proof address line comprises an MCU module and an address signal module;
the address signal module comprises a system control port, an address input port, an address output port and a power supply port; the address signal module also comprises a switch tube, a pull-up resistor R719 and an ESD (electrostatic discharge) prevention resistor R720;
the control end of the switching tube is connected with a system control port; the power port is connected with one end of the pull-up resistor R719; the other end of the pull-up resistor R719 is connected with the switch end of the switch tube; the other end of the pull-up resistor R719 is connected with the address input port; the other end of the pull-up resistor R719 is connected with an address output port through an ESD (electro-static discharge) prevention resistor R720; and the address output port is connected with the MCU module.
The utility model is further arranged that the address signal module further comprises a capacitor C663; the other end of the pull-up resistor R719 is grounded through a capacitor C663.
The utility model is further arranged that the address signal module further comprises a clamping diode D624; the cathode of the clamping diode D624 is connected with a power port; the anode of the clamping diode D624 is grounded.
The utility model is further arranged that the switch tube is a triode Q791; the base electrode of the triode Q791 is connected with a system control port; the emitter of the triode Q791 is grounded; the collector of the triode Q791 is connected with the other end of the pull-up resistor R719.
The utility model is further arranged that the address signal module further comprises a resistor R791; the base of the triode Q791 is grounded through a resistor R791.
The utility model has the beneficial effects that: through the above arrangement, when the address input port is at a low level, the ESD protection resistor R720 does not participate in voltage division, so that the resistance of the ESD protection resistor R720 can be increased to achieve the effect of ESD protection, and thus the MCU module can be prevented from being killed by ESD.
Drawings
The utility model will be further described with reference to the accompanying drawings, in which embodiments do not constitute any limitation of the utility model, and other drawings can be obtained by one of ordinary skill in the art without inventive effort from the following drawings.
Fig. 1 is a circuit diagram of a conventional address signal;
FIG. 2 is a circuit diagram of the present utility model;
fig. 3 is a circuit diagram of an address signal module of the present utility model.
Detailed Description
The utility model will be further described with reference to the following examples.
As can be seen from fig. 2 to 3, the CRPS power supply ESD protection address line according to the present embodiment includes an MCU module and an address signal module;
the address signal module comprises a system control port, an address input port, an address output port and a power supply port; the address signal module also comprises a switch tube, a pull-up resistor R719 and an ESD (electrostatic discharge) prevention resistor R720;
the control end of the switching tube is connected with a system control port; the power port is connected with one end of the pull-up resistor R719; the other end of the pull-up resistor R719 is connected with the switch end of the switch tube; the other end of the pull-up resistor R719 is connected with the address input port; the other end of the pull-up resistor R719 is connected with an address output port through an ESD (electro-static discharge) prevention resistor R720; and the address output port is connected with the MCU module.
Specifically, in the CRPS power supply ESD protection address line according to the embodiment, when the switch tube pulls down the address input port, the ESD protection resistor R720 does not participate in voltage division, so that the resistance value of the ESD protection resistor R720 can be increased to play a role in ESD protection.
When the address input port is at low level, the ESD prevention resistor R720 is the same as the address information of the address output port even if 10Kohm is taken, when the address input port is at high level, the input PIN of the MCU module is generally 200K-500K, and at the moment, the pull-up resistor R719, the ESD prevention resistor R720 and the MCU module form a voltage division so that the address information of the address output port is slightly lower than the address information of the address input port.
And the high-level threshold value of the read address signal of the general CRPS power supply MCU module is 2.4V, the address information of the address output port is not less than 3.3V/(the PIN input impedance of the MCU module+the pull-up resistor R719+the ESD-prevention resistor R720), and the minimum value of the PIN input impedance of the MCU module is 200K, so that the ESD-prevention resistor R720 is less than 65kohm, and the MCU can read high level.
The CRPS power supply ESD protection address line according to the embodiment, the address signal module further includes a capacitor C663; the other end of the pull-up resistor R719 is grounded through a capacitor C663. The filtering function is achieved through the arrangement.
The CRPS power supply ESD protection address line according to the embodiment, the address signal module further includes a clamping diode D624; the cathode of the clamping diode D624 is connected with a power port; the anode of the clamping diode D624 is grounded. The clamping function is achieved through the arrangement, and the address signal module is guaranteed to output accurate address information.
According to the CRPS power supply ESD-protection address line, the switching tube is a triode Q791; the base electrode of the triode Q791 is connected with a system control port; the emitter of the triode Q791 is grounded; the collector of the triode Q791 is connected with the other end of the pull-up resistor R719. The address input port is conveniently controlled to be in a high level or a low level through the arrangement.
The address signal module further comprises a resistor R791; the base of the triode Q791 is grounded through a resistor R791. Through the arrangement, the base electrode of the triode Q791 is conveniently driven.
Finally, it should be noted that the above embodiments are only for illustrating the technical solution of the present utility model, and not for limiting the scope of the present utility model, and although the present utility model has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made to the technical solution of the present utility model without departing from the spirit and scope of the technical solution of the present utility model.
Claims (5)
1. An ESD address line is prevented to CRPS power, characterized in that: comprises an MCU module and an address signal module;
the address signal module comprises a system control port, an address input port, an address output port and a power supply port; the address signal module also comprises a switch tube, a pull-up resistor R719 and an ESD (electrostatic discharge) prevention resistor R720;
the control end of the switching tube is connected with a system control port; the power port is connected with one end of the pull-up resistor R719; the other end of the pull-up resistor R719 is connected with the switch end of the switch tube; the other end of the pull-up resistor R719 is connected with the address input port; the other end of the pull-up resistor R719 is connected with an address output port through an ESD (electro-static discharge) prevention resistor R720; and the address output port is connected with the MCU module.
2. The CRPS power supply ESD protection address line of claim 1 wherein: the address signal module further comprises a capacitor C663; the other end of the pull-up resistor R719 is grounded through a capacitor C663.
3. The CRPS power supply ESD protection address line of claim 1 wherein: the address signal module further includes a clamping diode D624; the cathode of the clamping diode D624 is connected with a power port; the anode of the clamping diode D624 is grounded.
4. The CRPS power supply ESD protection address line of claim 1 wherein: the switching tube is a triode Q791; the base electrode of the triode Q791 is connected with a system control port; the emitter of the triode Q791 is grounded; the collector of the triode Q791 is connected with the other end of the pull-up resistor R719.
5. The CRPS power supply ESD protection address line of claim 4 wherein: the address signal module further comprises a resistor R791; the base of the triode Q791 is grounded through a resistor R791.
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CN202223575511.5U CN219016933U (en) | 2022-12-30 | 2022-12-30 | ESD (electro-static discharge) prevention address line of CRPS (common control point) power supply |
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CN202223575511.5U CN219016933U (en) | 2022-12-30 | 2022-12-30 | ESD (electro-static discharge) prevention address line of CRPS (common control point) power supply |
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