CN101976814B - Medical power supply management circuit - Google Patents
Medical power supply management circuit Download PDFInfo
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- CN101976814B CN101976814B CN 201010525205 CN201010525205A CN101976814B CN 101976814 B CN101976814 B CN 101976814B CN 201010525205 CN201010525205 CN 201010525205 CN 201010525205 A CN201010525205 A CN 201010525205A CN 101976814 B CN101976814 B CN 101976814B
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Abstract
一种医疗电源管理电路，包括待机芯片、过压取样输入端、欠压取样输入端、第一电压门限电路、第二电压门限电路及开关电路，其中，过压取样输入端通过第一电压门限电路连接开关电路的控制端，欠压取样输入端通过第二电压门限电路连接开关电路的控制端，开关电路的通路端与待机芯片的待机控制端连接。本发明在原医疗电源控制开关待机的待机芯片上，直接连接电压门限等各外围电路，得到过压、欠压甚至过流保护的功能，可以保证在某路电源输出不稳定时及时断开各路输出，防止出现输出通断不统一的问题，使得医疗设备的安全用电能够得到较好的保障。
A medical power supply management circuit, including a standby chip, an overvoltage sampling input terminal, an undervoltage sampling input terminal, a first voltage threshold circuit, a second voltage threshold circuit and a switch circuit, wherein the overvoltage sampling input terminal passes through the first voltage threshold The circuit is connected to the control terminal of the switch circuit, the undervoltage sampling input terminal is connected to the control terminal of the switch circuit through the second voltage threshold circuit, and the access terminal of the switch circuit is connected to the standby control terminal of the standby chip. The invention directly connects the peripheral circuits such as the voltage threshold on the standby chip of the original medical power supply control switch to obtain the function of overvoltage, undervoltage and even overcurrent protection, which can ensure that the power supply of a certain channel is disconnected in time when the output is unstable. Output, to prevent the problem of inconsistency of output on and off, so that the safe power consumption of medical equipment can be better guaranteed.
Description
Technical Field
The invention relates to a circuit structure, in particular to a management circuit of a medical power supply.
Background
The medical equipment generally needs power supply with a plurality of voltage values to be used by parts with different rated voltages in the equipment, so that the medical power supply matched with the medical equipment is required to have multi-output, and in the using process, the requirement on power supply stability is high, and the condition of unstable power supply cannot occur. In order to meet the requirements, the conventional medical power supply is provided with a corresponding protection circuit so as to perform corresponding emergency treatment when the power supply is unstable. Most medical power supplies on the market at present all realize the switch function through a standby chip, and usually can carry out corresponding protection to the external solitary protection unit of every voltage output, so, the protection unit is only to the output voltage that corresponds, be applied to multiplexed output's medical power supply, make the whole cost of product higher than normal, and output unstability in certain way of power, if under-voltage or overvoltage, only break off this way output, and the output power supply to other ways does not have the influence, can make medical equipment when the device stop work of certain part like this, other parts still continue to work, under certain circumstances, will produce danger.
Disclosure of Invention
The invention aims to provide a medical power supply management circuit which can realize the integral protection of medical power supply output and has lower cost.
The technical scheme adopted by the invention for solving the technical problem is as follows:
a medical power management circuit comprises
A standby chip;
at least one over-voltage sampling input terminal;
at least one under-voltage sampling input terminal;
the first voltage threshold circuit is conducted when the voltage is higher than a set value;
a second voltage threshold circuit that is turned on when the voltage is lower than a set value; and
a switching circuit; wherein,
the overvoltage sampling input end is connected with the control end of the switch circuit through the first voltage threshold circuit so as to control the switch-on and switch-off of the switch circuit through the output signal of the first voltage threshold circuit;
the under-voltage sampling input end is connected with the control end of the switch circuit through a second voltage threshold circuit so as to control the on-off of the switch circuit through an output signal of the second voltage threshold circuit;
and the path end of the switch circuit is connected with the standby control end of the standby chip.
The medical power management circuit further comprises a current sampling input end and a comparison circuit, wherein the current sampling input end is connected with the input end of the comparison circuit, and the output end of the comparison circuit is connected with the switch circuit.
As a further improvement of the above scheme, the switching circuit includes a second PNP triode and an NPN triode, wherein a base of the second PNP triode is connected to an output terminal of the first voltage threshold circuit, an emitter thereof is grounded, and a collector thereof is connected to a base of the NPN triode; and the emitting electrode of the NPN triode is connected with a triode power supply, and the collecting electrode of the NPN triode is connected with the standby control end of the standby chip.
As a further improvement of the above scheme, the first voltage threshold circuit is a zener diode, the cathode of which is connected to the overvoltage sampling input terminal, and the anode of which is connected to the switching circuit.
As a further improvement of the above scheme, the second voltage threshold circuit includes a first voltage regulator diode, a first resistor, and a first NPN triode, the cathode of the voltage regulator diode is connected to the undervoltage sampling input terminal, the anode of the voltage regulator diode is connected to the base of the first NPN triode, the emitter of the first NPN triode is grounded, and the collector of the first NPN triode is connected to the base of the second PNP triode; and two ends of the first resistor are respectively connected with the base electrode and the collector electrode of the first NPN triode.
As a further improvement of the above scheme, the current sampling input end is a voltage drop resistor connected to the circuit to be detected, and the forward and reverse input ends of the comparison circuit are respectively connected to two ends of the voltage drop resistor.
The invention has the beneficial effects that: the scheme adopted by the invention is that the chip to be controlled by the original medical power supply control switch is directly connected with each peripheral circuit such as a voltage threshold and the like to obtain the functions of overvoltage protection, undervoltage protection and even overcurrent protection, the implementation mode is simple and effective, the cost is lower, and the requirement of high reliability can be met.
Drawings
The following further description is made with reference to the accompanying drawings and detailed description:
FIG. 1 is a schematic block diagram of the present invention;
fig. 2 is a schematic circuit diagram of an embodiment of the present invention.
Detailed Description
Referring to fig. 1, the medical power management circuit provided by the present invention includes a standby chip 1, an overvoltage sampling input terminal 2 connected to a medical power, an undervoltage sampling input terminal 3 connected to the medical power, a first voltage threshold circuit 4 turned on when a voltage is higher than a set value, a second voltage threshold circuit 5 turned on when the voltage is lower than the set value, and a switch circuit 6; the overvoltage sampling input ends 2 can be provided with a plurality of voltage-stabilizing diodes, which respectively correspond to each path of output of the medical power supply, as an optimal implementation scheme, the overvoltage sampling input ends can be realized by reverse connection of the voltage-stabilizing diodes, and the magnitude of the overvoltage voltage is set by reverse conduction voltages of the voltage-stabilizing diodes of different models, so that the voltage-stabilizing diodes are reversely conducted when the medical power supply is in overvoltage, and a high-level signal is output; the overvoltage sampling input end 2 is connected with the control end of the switch circuit 6 through the first voltage threshold circuit 4 so as to control the switch circuit 6 to be switched on and off through the output signal of the first voltage threshold circuit 4; the same undervoltage sampling input end 3 is also respectively arranged aiming at each path of output of the medical power supply, and the voltage stabilizing diode is cut off by a mode of connecting the voltage stabilizing diode and the resistor in parallel when the input voltage is lower than a certain value, and a signal is output by the resistor; the undervoltage sampling input end 3 is connected with the control end of the switch circuit 6 through a second voltage threshold circuit 5 so as to control the on-off of the switch circuit 6 through the output signal of the second voltage threshold circuit 5; the switch circuit 6 outputs a corresponding high level or low level to the pin of the standby chip 1 according to the signal of the control terminal, so that the standby chip 1 correspondingly completes the switching action.
In the conventional medical power supply, a standby chip can be realized by adopting a general IC (integrated circuit), the standby chip generally has the functions of a conventional switch and a low-frequency switch, and the switch is controlled by adopting a high-low level mode of a chip pin.
Referring to fig. 2, a standby chip according to an embodiment of the present invention employs a low-cost CD4013, and the peripheral circuit provided in the present invention is used to implement related functions. The medical power supply has two paths of outputs, the rated values are respectively 5V and 12V, the first voltage threshold circuit 4 is a voltage stabilizing diode, the cathode of the voltage stabilizing diode is connected with the overvoltage sampling input end 2, the anode of the voltage stabilizing diode is connected with the switch circuit 6, so that the corresponding overvoltage sampling input end 2 is provided with a voltage stabilizing diode DZ3 which corresponds to 5V and is reversely connected, a voltage stabilizing diode DZ4 which corresponds to 12V, a voltage dividing resistor R16 and a voltage dividing resistor R44 are connected, and the voltage dividing diode is grounded through a filter capacitor C19; the standby chip 1 realizes corresponding functions such as switching, low level turn-off and the like through corresponding peripheral circuits; the switch circuit 6 comprises a second PNP triode Q4 and a PNP triode Q3, the base electrode of the second PNP triode Q4 is connected with the resistors R16 and R44 in an electrified mode, the second PNP triode Q4 is grounded through a filter capacitor C19, the output end of the first voltage threshold circuit 4 is connected, meanwhile, the emitting electrode of the first PNP triode Q3 is grounded, and the collecting electrode of the first PNP triode Q3 is connected with the base electrode of the first PNP triode; an emitting electrode of the PNP triode Q3 is connected with a triode power supply, a collector electrode of the PNP triode Q3 is connected with a standby control end of the standby chip 1, and the emitting electrode is connected with the power supply through a pull-up resistor R67; when the medical power supply is outputting normally, the voltage-stabilizing diodes DZ3 and DZ4 are not conducted, when the medical power supply is over-voltage, namely the output is more than 5V or 12V, the corresponding voltage-stabilizing diodes DZ3 or DZ4 are conducted, the voltage is transmitted to the base electrode of the second PNP triode Q4 through the diode D5 and the resistor R16, the PNP triode Q3 is further conducted, the voltage is transmitted to the pin 10 of the standby chip 1 through the diode D4 and the voltage-stabilizing tube DZ2, and the pin 10 is at high level, so that the standby chip correspondingly conducts shutdown action.
Because overvoltage and undervoltage protection are realized through the switch circuit 6, as a preferred scheme, the overvoltage and undervoltage protection circuit comprises a first voltage-stabilizing diode DZ1, a first resistor R8 and a first NPN triode Q1, wherein the cathode of the voltage-stabilizing diode DZ1 is connected with the undervoltage sampling input end 3, the anode of the voltage-stabilizing diode DZ1 is connected with the collector of the first NPN triode Q1, the collector of the first NPN triode Q1 is connected with the base of a second PNP triode Q4, and the emitter of the first NPN triode Q1 is grounded; two ends of the first resistor R8 are respectively connected with the base and the collector of the first NPN triode Q1. In this scheme, the under-voltage condition is generally only generated when the device is powered by the battery and the battery is in low power, and the medical power supply has two output paths, one of which is ac power supply and the other is battery power supply, so as shown in the figure, the under-voltage sampling input terminal 3 generally only detects the condition of battery voltage deficiency, and the other ac power supply supplies power to the standby chip through the 14 pins. When the battery voltage is normal, the first voltage stabilizing diode DZ1 is turned on, further, the first NPN triode Q1 is turned on, the input voltage is grounded through the first resistor R8, and when the voltage is too low, the first voltage stabilizing diode DZ1 is cut off due to undervoltage, the first NPN triode Q1 is cut off, the second PNP triode Q4 is controlled to be turned on, further, the PNP triode Q3 is turned on, so that the medical power supply is correspondingly turned off at the high level of the 10 pins of the standby chip 1, and the undervoltage protection function is realized.
As shown in fig. 1 and fig. 2, the present invention further provides a circuit structure for detecting the current status of the medical power supply, the circuit structure includes a current sampling input terminal 7 and a comparison circuit 8, the current sampling input terminal 7 is connected to an input terminal of the comparison circuit 8, and an output terminal of the comparison circuit 8 is connected to the switch circuit 6. In the invention, the current can be measured by adopting a resistance side voltage drop mode, as shown in the figure, the current sampling input end 7 is a voltage drop resistor R0 connected to a circuit to be detected, and the forward and reverse input ends of the comparison circuit 8 are respectively connected to two ends of a voltage drop resistor R0. When overcurrent/undercurrent appears at the circuit end to be detected, the comparison circuit 8 compares the voltage change at the two ends of the voltage drop resistor R0, when overcurrent occurs, the comparison circuit 8 outputs high level, the state of the high level is fed back to the switch circuit 6, and then the switch circuit 6 controls the standby chip 1 correspondingly.
In summary, the scheme adopted by the invention is to directly connect each peripheral circuit such as a voltage threshold and the like on the standby chip of the original medical power supply control switch to obtain the functions of overvoltage, undervoltage and even overcurrent protection, the implementation mode is simple and effective, the cost is lower, and the requirement of high reliability can be met.
Claims (4)
1. A medical power management circuit comprises a standby chip (1), and is characterized by further comprising:
at least one overvoltage sampling input (2);
at least one under-voltage sampling input (3);
a first voltage threshold circuit (4) which is turned on when the voltage is higher than a set value;
a second voltage threshold circuit (5) which is turned on when the voltage is lower than a set value; and
a switch circuit (6), a current sampling input terminal (7) and a comparison circuit (8); wherein,
the overvoltage sampling input end (2) is connected with the control end of the switch circuit (6) through the first voltage threshold circuit (4) so as to control the switch circuit (6) to be switched on and off through an output signal of the first voltage threshold circuit (4);
the undervoltage sampling input end (3) is connected with the control end of the switch circuit (6) through a second voltage threshold circuit (5) so as to control the on and off of the switch circuit (6) through an output signal of the second voltage threshold circuit (5);
the current sampling input end (7) is connected with the input end of a comparison circuit (8), and the output end of the comparison circuit (8) is connected with a switch circuit (6);
the switch circuit (6) comprises a second PNP triode (Q4) and a PNP triode (Q3), the base electrode of the second PNP triode (Q4) is connected with the output ends of the first voltage threshold circuit (4) and the comparison circuit (8), the emitting electrode of the second PNP triode is grounded, and the collector electrode of the second PNP triode is connected with the base electrode of the PNP triode (Q3); and the emitting electrode of the PNP triode (Q3) is connected with a triode power supply, and the collecting electrode of the PNP triode is connected with the standby control end of the standby chip (1).
2. The medical power management circuit of claim 1, wherein: the first voltage threshold circuit (4) is a voltage stabilizing diode, the cathode of the first voltage threshold circuit is connected with the overvoltage sampling input end (2), and the anode of the first voltage threshold circuit is connected with the switch circuit (6).
3. The medical power management circuit of claim 1, wherein: the second voltage threshold circuit (5) comprises a first voltage stabilizing diode (DZ 1), a first resistor (R8) and a first NPN triode (Q1), wherein the cathode of the voltage stabilizing diode (DZ 1) is connected with the undervoltage sampling input end (3), the anode of the voltage stabilizing diode (DZ 1) is connected with the base electrode of the first NPN triode (Q1), the emitter electrode of the first NPN triode (Q1) is grounded, and the collector electrode of the first NPN triode is connected with the base electrode of the second PNP triode (Q4); two ends of the first resistor (R8) are respectively connected with the base electrode and the collector electrode of the first NPN triode (Q1).
4. The medical power management circuit of claim 1, wherein: the current sampling input end (7) is a voltage drop resistor (R0) connected to a circuit to be detected, and the positive and negative input ends of the comparison circuit (8) are respectively connected to two ends of the voltage drop resistor (R0).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010525205 CN101976814B (en) | 2010-10-30 | 2010-10-30 | Medical power supply management circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010525205 CN101976814B (en) | 2010-10-30 | 2010-10-30 | Medical power supply management circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101976814A CN101976814A (en) | 2011-02-16 |
| CN101976814B true CN101976814B (en) | 2012-12-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201010525205 Expired - Fee Related CN101976814B (en) | 2010-10-30 | 2010-10-30 | Medical power supply management circuit |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111240387B (en) * | 2020-03-12 | 2021-10-08 | 北京中科银河芯科技有限公司 | Anti-overshoot circuit, voltage stabilizer and anti-overshoot method |
| CN111565290B (en) * | 2020-05-29 | 2025-11-25 | 深圳市鼎盛光电有限公司 | An LED power supply overvoltage protection circuit, an LED driver power supply circuit, and a television. |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2706937Y (en) * | 2004-05-28 | 2005-06-29 | 成都瑞联电气股份有限公司 | General high-reliability switch power |
| CN1848577A (en) * | 2005-06-17 | 2006-10-18 | 华为技术有限公司 | Overcurrent protection circuit |
| CN201038725Y (en) * | 2007-01-08 | 2008-03-19 | 韩战平 | Medical appliance overcurrent protection circuit |
| CN201860086U (en) * | 2010-10-30 | 2011-06-08 | 珠海市鑫和电器有限公司 | Medical power supply management circuit |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006246630A (en) * | 2005-03-03 | 2006-09-14 | Omron Corp | Terminal block unit |
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2010
- 2010-10-30 CN CN 201010525205 patent/CN101976814B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2706937Y (en) * | 2004-05-28 | 2005-06-29 | 成都瑞联电气股份有限公司 | General high-reliability switch power |
| CN1848577A (en) * | 2005-06-17 | 2006-10-18 | 华为技术有限公司 | Overcurrent protection circuit |
| CN201038725Y (en) * | 2007-01-08 | 2008-03-19 | 韩战平 | Medical appliance overcurrent protection circuit |
| CN201860086U (en) * | 2010-10-30 | 2011-06-08 | 珠海市鑫和电器有限公司 | Medical power supply management circuit |
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| Publication number | Publication date |
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| CN101976814A (en) | 2011-02-16 |
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Granted publication date: 20121212 |