CN102377172A - Three-phase program controlled power source and power amplifier tube short-circuiting protective circuit thereof - Google Patents
Three-phase program controlled power source and power amplifier tube short-circuiting protective circuit thereof Download PDFInfo
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Abstract
The invention belongs to the field of electric power engineering and provides a three-phase program controlled power source and a power amplifier tube short-circuiting protective circuit thereof. In the invention, the power amplifier tube short-circuiting protective circuit which comprises a sample resistance, an operational amplifier unit, a comparing unit and a switch unit is used for detecting short-circuiting currents of a negative power source input end of a power amplifier tube and correspondingly controlling the working condition of the power amplifier tube according to a detection result, and therefore, when the power amplifier tube is short-circuited, the power amplifier tube short-circuit protective circuit can rapidly control the power amplifier tube to stop working, effectively protects the power amplifier tube from being damaged due to the short-circuiting fault and solves the problem that the prior art can not carry out comprehensive short-circuiting protection on the power amplifier tube.
Description
Technical field
The invention belongs to the power engineering field, relate in particular to program control power source of a kind of three-phase and power tube short-circuit protection circuit thereof.
Background technology
In power amplification circuit, the power tube important component part that is absolutely necessary, if in practical application because of misoperation causes the power tube short circuit, then can make the whole power amplification circuit can't operate as normal.
To the problem that above-mentioned power tube short circuit is occurred, prior art provides a kind of power tube protective circuit, and it carries out clamper through the output voltage that adopts the diode pair power tube, thereby realizes power tube is carried out short-circuit protection.Yet, because the response speed of prior art is slow, can only hour shield, and when short circuit current greatly the time, it can't carry out comprehensive short-circuit protection to power tube at short circuit current to power tube.Therefore, there is the problem that can't carry out comprehensive short-circuit protection to power tube in prior art.
Summary of the invention
The invention provides a kind of power tube short-circuit protection circuit, be intended to solve the problem that can't carry out comprehensive short-circuit protection to power tube that prior art exists.
The present invention is achieved in that a kind of power tube short-circuit protection circuit, is connected with power tube, power supply, reference voltage source, and said power tube short-circuit protection circuit comprises:
Sample resistance, the negative supply input of the said power tube of first termination, the negative terminal of the said power supply of second termination is used for the negative supply input of said power tube is carried out current sample, and generates sampling voltage;
The amplifier unit, first end and second end of first input end and the said sample resistance of the second input termination are used for generating a short circuit reference voltage according to said sampling voltage;
Comparing unit, first input end connect the output of said reference voltage source, and the output of the said amplifier of second input termination unit is used for the output voltage of said short circuit reference voltage and said reference voltage source is compared, and the output short-circuit decision signal;
Switch element, the output of the said comparing unit of control termination, input is connected with the negative supply input with the mute signal input of said power tube respectively with output, is used for controlling according to said short circuit decision signal the operating state of said power tube.
Another object of the present invention also is to provide a kind of program control power source of three-phase that comprises said power tube short-circuit protection circuit.
In the present invention; The said power tube short-circuit protection circuit that comprises said sample resistance, said amplifier unit, said comparing unit and said switch element through employing; Short circuit current to the negative supply input of said power tube detects; And correspondingly said power tube is carried out operating state according to testing result and control, thereby realized when said power tube is short-circuited, can control said power tube apace and quit work; Protect said power tube to avoid the damage that short trouble brings effectively, solved the problem that can't carry out comprehensive short-circuit protection to power tube that prior art exists.
Description of drawings
Fig. 1 is the modular structure figure of the power tube short-circuit protection circuit that provides of the embodiment of the invention;
Fig. 2 is the exemplary circuit structure chart of the power tube short-circuit protection circuit that provides of the embodiment of the invention.
Embodiment
In order to make the object of the invention, technical scheme and advantage clearer,, the present invention is further elaborated below in conjunction with accompanying drawing and embodiment.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.
Fig. 1 shows the modular structure figure of the power tube short-circuit protection circuit that the embodiment of the invention provides, and for the ease of explanation, only shows the part relevant with the embodiment of the invention, and details are as follows:
Power tube short-circuit protection circuit 100 is connected with power tube U1, power supply 200, reference voltage source 300, and this power tube short-circuit protection circuit 100 comprises:
Sample resistance R1, the negative terminal V2-of negative supply input 4, the second termination power supplies 200 of the first termination power tube U1 is used for the negative supply input 4 of power tube U1 is carried out current sample, and generates sampling voltage.
Comparing unit 102, first input end connect the output of reference voltage source 300, and the output of the second input termination amplifier unit 101 is used for the output voltage of short circuit reference voltage and reference voltage source 300 is compared, and the output short-circuit decision signal.
Power tube short-circuit protection circuit 100 also comprises:
Output over-voltage protection unit 104; The anode V2+ of output 3, the first termination power supplies 200 of input termination power tube U1, first end of the second termination sample resistance R1; Be used for the alternating current of power tube U1 output is carried out the voltage stabilizing processing, and from its output output stable AC.
Power tube short-circuit protection circuit 100 further comprises:
Decoupling capacitor C1, decoupling capacitor C2, diode D1 and diode D2;
The positive pole of decoupling capacitor C1 is connected with simulation ground AGND with the positive power source terminal V2+ of power supply 200 respectively with negative pole; The negative pole of decoupling capacitor C2 accesses second end of kind resistance R 1; The positive pole of decoupling capacitor C2 meets simulation ground AGND; The anode of diode D1 meets the positive power source terminal V2+ of power supply 200; The negative electrode of diode D1 is connected with the second positive supply input 2 with the first positive supply input 1 of power tube U1 simultaneously, and the anode of diode D2 is connected with the negative supply input 4 of power tube U1 and first end of sample resistance R1 respectively with negative electrode.Decoupling capacitor C1 and decoupling capacitor C2 are used to eliminate the interference signal that power tube U1 produces because of self-oscillation in the course of the work; Diode D1 and diode D2 are used to prevent that the positive-negative power termination of power supply 200 from opposing the damage that power tube U1 is caused.
In embodiments of the present invention, the earth terminal 7 of power tube U1 meets simulation ground AGND, and inverting input 5 and the in-phase input end 6 of power tube U1 insert voltage signal V1 and V2 respectively; The output voltage of reference voltage source 300 is 0.25V.
Fig. 2 shows the exemplary circuit figure of the power tube short-circuit protection circuit that the embodiment of the invention provides, and for the ease of explanation, only shows the part relevant with the embodiment of the invention, and details are as follows:
As one embodiment of the invention, amplifier unit 101 comprises:
Diode D3, diode D4, AD620BR instrument operational amplifier U2, capacitor C 3, capacitor C 4 and resistance R 2;
The anode of diode D3 and negative electrode are respectively the first input end and second input of amplifier unit 101; The anode of diode D4 is connected with anode with the negative electrode of diode D3 respectively with negative electrode; In-phase input end 1 and the inverting input 2 of AD620BR instrument operational amplifier U2 connects negative electrode and the anode of diode D4 respectively; The positive power source terminal 3 of AD620BR instrument operational amplifier U2 connects+the 5V DC power supply; The negative power end 4 of AD620BR instrument operational amplifier U2 and earth terminal 5 are connected with ground with-5V DC power supply respectively; Capacitor C 3 is connected between the positive power source terminal 3 and ground of AD620BR instrument operational amplifier U2; Capacitor C 4 is connected between the negative power end 4 and ground of AD620BR instrument operational amplifier U2, and resistance R 2 is connected between the first gain end, the 6 and second gain end 7 of AD620BR instrument operational amplifier U2, and the output 8 of AD620BR instrument operational amplifier U2 is the output of amplifier unit 101.
As one embodiment of the invention, comparing unit 102 comprises:
Comparator U3, capacitor C 5, resistance R 3, diode D5, resistance R 4, SN74LVCLG175 latch U4, comparator U5 and resistance R 5;
Inverting input 1 and the in-phase input end 2 of comparator U3 is respectively the first input end and second input of comparing unit 102; The positive power source terminal 3 of comparator U3 and negative power end 4 are connected with-5V DC power supply with+5V DC power supply respectively; Capacitor C 5 is connected between the positive power source terminal 3 and ground of comparator U3; Resistance R 3 is connected between the positive power source terminal 3 and output 5 of comparator U3; The anode of diode D5 is connected with the output 5 of comparator U3 and first end 1 of SN74LVCLG175 latch U4 respectively with negative electrode; Resistance R 4 is connected between first end 1 and ground of SN74LVCLG175 latch U4, and the 3rd end 3 of SN74LVCLG175 latch U4 and five terminal 5 all are connected second end, 2 ground connection of SN74LVCLG175 latch U4 with+5V DC power supply; The 4th end 4 of SN74LVCLG175 latch U4 connects the inverting input 2 of comparator U5; The 6th end 6 skies of SN74LVCLG175 latch U4 connect, and the in-phase input end 1 of comparator U5 connects the in-phase input end 1 of comparator U3, and the positive power source terminal 3 of comparator U5 and negative power end 4 are connected with-5V DC power supply with+5V DC power supply respectively; Resistance R 5 is connected between the positive power source terminal 3 and output 5 of comparator U5, and the output 5 of comparator U5 is the output of comparing unit 102.
As one embodiment of the invention, switch element 103 comprises:
First end of resistance R 6 is the control end of switch element 103; The grid of N type metal-oxide-semiconductor Q1 is connected with second end of resistance R 6 and first end of resistance R 7 respectively with drain electrode; The source electrode of N type metal-oxide-semiconductor Q1 is the output of switch element 103, and second end of resistance R 7 is the input of switch element 103.
As one embodiment of the invention, output over-voltage protection unit 104 comprises:
Current-limiting resistance R8, diode D6, diode D7 and Transient Suppression Diode TV1;
First end of current-limiting resistance R8 and second end are respectively the input and the output of output over-voltage protection unit 104; The anode of diode D6 is connected with second end of current-limiting resistance R8, the negative electrode of diode D7 and first end of Transient Suppression Diode TV1 simultaneously; The anode of the negative electrode of diode D6 and diode D7 is respectively first end and second end of output over-voltage protection unit 104, the second end ground connection of Transient Suppression Diode TV1.
In embodiments of the present invention; Through adopting current-limiting resistance R8 that the alternating current of power tube U1 output is carried out current limliting; The alternating current that diode D6 and diode D7 convection current go out current-limiting resistance R8 carries out voltage clamp; And the Transient Suppression Diode TV1 convection current alternating current that goes out current-limiting resistance R8 carries out overvoltage and suppresses, thereby makes power tube U1 output stable AC.
In embodiments of the present invention, power tube U1 has under the situation of low level input at its mute signal input 8, can keep original operating state, otherwise, then quit work.
Below in conjunction with operation principle power tube short-circuit protection circuit 100 is described further:
When power tube U1 is under the normal operating conditions, the sampling voltage at sample resistance R1 two ends is less than 0.25V, and then the short circuit reference voltage of output 8 outputs of AD620BR instrument operational amplifier U2 is zero; Comparator U3 exports a low level, because the forward bias characteristic of diode D5, the voltage of diode D5 negative electrode is zero; So; The output voltage of the 4th end 4 of SN74LVCLG175 latch U4 also is zero, and the voltage of the in-phase input end 1 of SN74LVCLG175 comparator U4 is higher than the voltage of inverting input 2, its output 5 outputs one high level; This high level is input to the grid of N type metal-oxide-semiconductor Q1 through resistance R 6 as the short circuit decision signal; Thereby make N type metal-oxide-semiconductor Q1 conducting, the mute signal input 8 of power tube U1 is a low level, and power tube U1 continues operate as normal.
When the input of the power supply of power tube U1 is short-circuited, the sampling voltage at the two ends of sample resistance R1 is during greater than 0.25V, and the short circuit reference voltage of output 8 outputs of AD620BR instrument operational amplifier U2 is identical with this pressure drop; Then comparator U3 exports a high level; So, after SN74LVCLG175 latch U4 latchs this high level, the inverting input 2 from its 4th end 4 output 5V voltages to comparator U5; Make comparator U5 export a low level; This low level is input to the grid of N type metal-oxide-semiconductor Q1 as the short circuit decision signal through resistance R 6, and then N type metal-oxide-semiconductor Q1 ends, the mute signal input 8 no low levels inputs of power tube U1; Thereby power tube U1 is quit work, reach the purpose of power tube U1 being carried out short-circuit protection.
Another purpose of the embodiment of the invention also is to provide a kind of program control power source of three-phase that comprises above-mentioned power tube short-circuit protection circuit 100.
In embodiments of the present invention; The said power tube short-circuit protection circuit that comprises sample resistance R1, amplifier unit 101, comparing unit 102 and switch element 103 through employing; Short circuit current to the negative supply input of power tube U1 detects; And correspondingly power tube U1 is carried out operating state according to testing result and control, thereby realized when power tube U1 is short-circuited, can control power tube U1 apace and quit work; Protect power tube U1 to avoid the damage that short trouble brings effectively, solved the problem that can't carry out comprehensive short-circuit protection to power tube that prior art exists.
The above is merely preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of within spirit of the present invention and principle, being done, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (7)
1. a power tube short-circuit protection circuit is connected with power tube, power supply, reference voltage source, and said power tube short-circuit protection circuit comprises:
Sample resistance, the negative supply input of the said power tube of first termination, the negative terminal of the said power supply of second termination is used for the negative supply input of said power tube is carried out current sample, and generates sampling voltage;
The amplifier unit, first end and second end of first input end and the said sample resistance of the second input termination are used for generating a short circuit reference voltage according to said sampling voltage;
Comparing unit, first input end connect the output of said reference voltage source, and the output of the said amplifier of second input termination unit is used for the output voltage of said short circuit reference voltage and said reference voltage source is compared, and the output short-circuit decision signal;
Switch element, the output of the said comparing unit of control termination, input is connected with the negative supply input with the mute signal input of said power tube respectively with output, is used for controlling according to said short circuit decision signal the operating state of said power tube.
2. power tube short-circuit protection circuit as claimed in claim 1 is characterized in that, said power tube short-circuit protection circuit also comprises:
The output over-voltage protection unit; The output of the said power tube of input termination, the anode of the said power supply of first termination, first end of the said sample resistance of second termination; Be used for the alternating current of said power tube output is carried out the voltage stabilizing processing, and from its output output stable AC.
3. power tube short-circuit protection circuit as claimed in claim 1 is characterized in that, said amplifier unit comprises:
Diode D3, diode D4, AD620BR instrument operational amplifier U2, capacitor C 3, capacitor C 4 and resistance R 2;
The anode of said diode D3 and negative electrode are respectively the first input end and second input of said amplifier unit; The anode of said diode D4 is connected with anode with the negative electrode of said diode D3 respectively with negative electrode; Negative electrode and anode that the in-phase input end of said AD620BR instrument operational amplifier U2 and inverting input meet said diode D4 respectively; Positive supply termination+5V DC power supply of said AD620BR instrument operational amplifier U2; The negative power end of said AD620BR instrument operational amplifier U2 and earth terminal are connected with ground with-5V DC power supply respectively; Said capacitor C 3 is connected between the positive power source terminal and ground of said AD620BR instrument operational amplifier U2; Said capacitor C 4 is connected between the negative power end and ground of said AD620BR instrument operational amplifier U2, and said resistance R 2 is connected between the first gain end and the second gain end of said AD620BR instrument operational amplifier U2, and the output of said AD620BR instrument operational amplifier U2 is the output of said amplifier unit.
4. power tube short-circuit protection circuit as claimed in claim 1 is characterized in that, said comparing unit comprises:
Comparator U3, capacitor C 5, resistance R 3, diode D5, resistance R 4, SN74LVCLG175 latch U4, comparator U5 and resistance R 5;
The inverting input of said comparator U3 and in-phase input end are respectively the first input end and second input of said comparing unit; The positive power source terminal of said comparator U3 and negative power end are connected with-5V DC power supply with+5V DC power supply respectively; Said capacitor C 5 is connected between the positive power source terminal and ground of said comparator U3; Said resistance R 3 is connected between the positive power source terminal and output of said comparator U3; The anode of said diode D5 is connected with the output of said comparator U3 and first end of said SN74LVCLG175 latch U4 respectively with negative electrode; Said resistance R 4 is connected between first end and ground of said SN74LVCLG175 latch U4; The 3rd end of said SN74LVCLG175 latch U4 and five terminal all are connected with+5V DC power supply; The second end ground connection of said SN74LVCLG175 latch U4, the inverting input of the said comparator U5 of the 4th termination of said SN74LVCLG175 latch U4, the 6th end sky of said SN74LVCLG175 latch U4 connects; The in-phase input end of said comparator U5 connects the in-phase input end of said comparator U3; The positive power source terminal of said comparator U5 and negative power end are connected with-5V DC power supply with+5V DC power supply respectively, and said resistance R 7 is connected between the positive power source terminal and output of said comparator U5, and the output 5 of said comparator U5 is the output of said comparing unit.
5. power tube short-circuit protection circuit as claimed in claim 1 is characterized in that, said switch element comprises:
Resistance R 8, N type metal-oxide-semiconductor Q1, resistance R 9;
First end of said resistance R 8 is the control end of said switch element 103; The grid of said N type metal-oxide-semiconductor Q1 is connected with second end of said resistance R 8 and first end of said resistance R 9 respectively with drain electrode; The source electrode of said N type metal-oxide-semiconductor Q1 is the output of said switch element, and second end of said resistance R 9 is the input of said switch element.
6. power tube short-circuit protection circuit as claimed in claim 2 is characterized in that, said output over-voltage protection unit comprises:
Current-limiting resistance R10, diode D6, diode D7 and Transient Suppression Diode TV1;
First end of said current-limiting resistance R10 and second end are respectively the input and the output of said output over-voltage protection unit; The anode of said diode D6 is connected with the negative electrode of second end of said current-limiting resistance R10, said diode D7 and first end of said Transient Suppression Diode TV1 simultaneously; The anode of the negative electrode of said diode D6 and said diode D7 is respectively first end and second end of said output over-voltage protection unit, the second end ground connection of said Transient Suppression Diode TV1.
7. the program control power source of three-phase is characterized in that, the program control power source of said three-phase comprises like each described power tube short-circuit protection circuit of claim 1 to 6.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110333610XA CN102377172B (en) | 2011-10-28 | 2011-10-28 | Three-phase program controlled power source and power amplifier tube short-circuiting protective circuit thereof |
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| CN201110333610XA CN102377172B (en) | 2011-10-28 | 2011-10-28 | Three-phase program controlled power source and power amplifier tube short-circuiting protective circuit thereof |
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| CN102377172B CN102377172B (en) | 2013-11-20 |
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Cited By (4)
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| CN103022968A (en) * | 2012-06-19 | 2013-04-03 | 华为技术有限公司 | Protection circuit, control method of protection circuit, telecommunication plug-in shelf device |
| CN105977908A (en) * | 2016-06-21 | 2016-09-28 | 中国电子科技集团公司第三十八研究所 | Automatic recovery DC overvoltage protection circuit of unmanned aerial vehicle |
| CN109239514A (en) * | 2018-08-03 | 2019-01-18 | 重庆川仪自动化股份有限公司 | A kind of liquidometer short circuit sensor, open detection circuit |
| WO2023202145A1 (en) * | 2022-04-19 | 2023-10-26 | Oppo广东移动通信有限公司 | Short-circuit protection circuit, control method, and electronic device |
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| CN109239514A (en) * | 2018-08-03 | 2019-01-18 | 重庆川仪自动化股份有限公司 | A kind of liquidometer short circuit sensor, open detection circuit |
| CN109239514B (en) * | 2018-08-03 | 2021-02-09 | 重庆川仪自动化股份有限公司 | Short circuit and open circuit detection circuit of liquid level meter sensor |
| WO2023202145A1 (en) * | 2022-04-19 | 2023-10-26 | Oppo广东移动通信有限公司 | Short-circuit protection circuit, control method, and electronic device |
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| CN102377172B (en) | 2013-11-20 |
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Owner name: SHENZHEN STAR DRAGON TECHNOLOGY CO., LTD. Free format text: FORMER NAME: SHENZHEN XINGLONG SCIENCE AND TECHNOLOGY CO., LTD. |
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Address after: 1203, room 4050, SAIC building, No. 518000 Nanhai Road, Shenzhen, Guangdong, Nanshan District Patentee after: SHENZHEN CITY STAR DRAGON TECHNOLOGY Co.,Ltd. Address before: 518052, Guangdong, Shenzhen province Nanshan District Nanshan digital cultural industry base, west block, 11 floor Patentee before: Shenzhen Xinglong Science and Technology Co.,Ltd. |
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Denomination of invention: Three-phase program controlled power source and power amplifier tube short-circuiting protective circuit thereof Effective date of registration: 20200722 Granted publication date: 20131120 Pledgee: Bank of Jiangsu Limited by Share Ltd. Shenzhen branch Pledgor: SHENZHEN CITY STAR DRAGON TECHNOLOGY Co.,Ltd. Registration number: Y2020980004294 |
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Date of cancellation: 20211125 Granted publication date: 20131120 Pledgee: Bank of Jiangsu Limited by Share Ltd. Shenzhen branch Pledgor: SHENZHEN CITY STAR DRAGON TECHNOLOGY Co.,Ltd. Registration number: Y2020980004294 |
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Denomination of invention: A three-phase program-controlled power source and its power amplifier tube short-circuit protection circuit Effective date of registration: 20220112 Granted publication date: 20131120 Pledgee: Bank of Jiangsu Limited by Share Ltd. Shenzhen branch Pledgor: SHENZHEN CITY STAR DRAGON TECHNOLOGY Co.,Ltd. Registration number: Y2022440020004 |
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Date of cancellation: 20230217 Granted publication date: 20131120 Pledgee: Bank of Jiangsu Limited by Share Ltd. Shenzhen branch Pledgor: SHENZHEN CITY STAR DRAGON TECHNOLOGY Co.,Ltd. Registration number: Y2022440020004 |
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Denomination of invention: A three-phase program-controlled power source and its power amplifier short circuit protection circuit Effective date of registration: 20230223 Granted publication date: 20131120 Pledgee: Bank of Jiangsu Limited by Share Ltd. Shenzhen branch Pledgor: SHENZHEN CITY STAR DRAGON TECHNOLOGY Co.,Ltd. Registration number: Y2023980033206 |