CN106997220B - Delayed power circuit - Google Patents
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- CN106997220B CN106997220B CN201710197501.7A CN201710197501A CN106997220B CN 106997220 B CN106997220 B CN 106997220B CN 201710197501 A CN201710197501 A CN 201710197501A CN 106997220 B CN106997220 B CN 106997220B
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- 239000003990 capacitor Substances 0.000 claims description 19
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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
- G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
- G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices
- G05F1/562—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices with a threshold detection shunting the control path of the final control device
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Abstract
The present invention provides a kind of delayed power circuits, including LDO circuit module, control circuit module to connect module with power supply；Wherein, LDO circuit module includes at least two LDO circuits in parallel, converts input voltage into predeterminated voltage by LDO circuit；Control circuit module includes delayed protection circuit; it includes corresponding the socket circuit being connected with delayed protection circuit that power supply, which connects module; delayed protects the number of circuit corresponding with the number of LDO circuit; predeterminated voltage is input in delayed protection circuit, is successively powered on by the socket circuit that delayed protects circuit control to protect circuit to be connected with delayed.It can be improved the highly-safe of the utilization rate of power supply output, the energization testing cost of reduction product and product test through the invention.
Description
Technical Field
The invention relates to the technical field of power supplies, in particular to a power-on delay power supply circuit.
Background
In a conventional product power-on reliability test, tens or even hundreds of products are generally required to be powered on and operated for a long time under a specific environment (e.g., an environment of high temperature and high humidity, etc.) to verify the stability of the products. When a high-power product is subjected to the reliability test, a very large working current is needed, and particularly when a plurality of products are electrified simultaneously, the needed starting current is usually several times of the working current; in addition, the power-on reliability test of the product has higher requirements on the stability of a power supply system and overcurrent and overheat protection.
The existing power supply schemes commonly used for testing the power-on reliability of products mainly comprise two power supply schemes, one scheme is that a DC-DC (Direct Current-Direct Current) power supply module is adopted, and the power supply module has the advantages of high power supply conversion efficiency and high power, but has larger output pulsation and switching noise and higher cost; the other is to provide power by means of LDO (Low drop out regulator), but the power provided by this way has Low conversion rate, Low output power, high cost and no overcurrent thermal protection.
At present, for the simultaneous test of a plurality of products, two schemes are adopted, one scheme is that a power supply circuit is designed for each product independently, but the system integration rate of the method is low, the volume is larger, and the starting current of the product is several times of the working current, so the power output utilization rate of the product during normal work after starting is extremely low; the other is to use a dc regulated power supply to provide power for all products to be tested, but in this way, when a plurality of products are measured, the output current capability of the dc regulated power supply is extremely high, and particularly at the moment when a plurality of products are powered on simultaneously, the starting current extremely required usually needs to reach hundreds of amperes, so the manufacturing cost of such a dc regulated power supply is high, which undoubtedly increases the production cost of enterprises.
Disclosure of Invention
In view of the above problems, the present invention provides a power-on delay power supply circuit to solve the problems of low output utilization rate and high test cost of the existing power supply for testing the power-on reliability of a product.
The invention provides a power-on time delay power supply circuit, which comprises an LDO circuit module, a control circuit module and a power supply connection module; the LDO circuit module comprises at least two LDO circuits connected in parallel, and the input voltage is converted into a preset voltage through the LDO circuits; the control circuit module comprises power-on delay protection circuits, the power supply connection module comprises socket circuits which are connected with the power-on delay protection circuits in a one-to-one correspondence mode, the number of the power-on delay protection circuits corresponds to the number of the LDO circuits, preset voltage is input into the power-on delay protection circuits, and the socket circuits connected with the power-on delay protection circuits are controlled to be sequentially powered on through the power-on delay protection circuits.
Further, a preferable structure is: the LDO circuit comprises an LDO chip, a self-recovery fuse, a filter capacitor and a voltage division circuit; the LDO chip is used for converting input voltage into preset voltage; the self-recovery fuse is used for performing overcurrent protection on the LDO circuit; the filter capacitor is used for carrying out filtering processing on the LDO circuit; the voltage division circuit is used for enabling the LDO circuit to output accurate preset voltage.
Further, a preferable structure is: the LDO circuit further comprises a first indicating circuit, wherein the first indicating circuit is used for indicating whether the output voltage of the LDO circuit is normal or not; when the output voltage of the LDO circuit is normal, the LED in the first indicating circuit is lightened.
Further, a preferable structure is: the LDO circuit also comprises a reverse protection diode connected in series with the LDO circuit; the number of the reverse protection diodes corresponds to the number of the LDO circuits one by one.
Further, a preferable structure is: the power-on delay protection circuit comprises a power-on delay circuit consisting of a field effect transistor Q1, a triode Q3, a resistor R3, a resistor R8 and a capacitor C3; the resistor R3, the resistor R8 and the capacitor C3 are used for carrying out power-on delay control on the socket circuit, and the field-effect tube Q1 realizes on-off control of a power supply under the control of the triode Q3; at the moment of electrifying the socket circuit, the capacitor C3 is short-circuited, and the triode Q3 is in a cut-off state, so that the field effect transistor Q1 is controlled to be turned off; after the socket circuit is powered on, the transistor Q3 enters a saturated conduction state, thereby controlling the fet Q1 to conduct.
Further, a preferable structure is: the power-on delay protection circuit comprises an overheat protection circuit consisting of a resistor R4, a resistor R10 and a triode Q4; the resistor R4 is used for monitoring the temperature of the power-on delay protection circuit, when the temperature of the power-on delay protection circuit exceeds a preset threshold value, the triode Q4 is switched on, the triode Q3 is switched off, and therefore the field effect transistor Q1 is controlled to be switched off.
Further, a preferable structure is: the power-on delay protection circuit comprises an overcurrent protection circuit consisting of a resistor R1, a resistor R9, a resistor R7, a triode Q2 and a triode Q5; when the current flowing through the resistor R1 exceeds a preset current threshold, the triode Q2 and the triode Q5 are in a conducting state, the triode Q3 is cut off, and the field effect transistor Q1 is controlled to be turned off.
Further, a preferable structure is: the power-on time delay protection circuit comprises a filter circuit, and the filter circuit is used for enabling the power-on time delay protection circuit to output stable voltage.
Further, a preferable structure is: the power-on time delay protection circuit comprises a second indicating circuit consisting of a resistor R6 and a diode D6, and the second indicating circuit is used for indicating whether the output voltage of the power-on time delay protection circuit is normal or not; when the output voltage of the power-on delay protection circuit is normal, the LED in the second indicating circuit is lightened.
Compared with the prior art, the power-on delay power supply circuit has obvious advantages in power-on reliability test of a large number of high-power low-voltage direct-current products, realizes high-power output of the circuit by adopting parallel connection of a plurality of LDO circuits, and improves the utilization rate of the power output capacity; meanwhile, the tested products are sequentially electrified through the electrifying time delay protection circuit, so that the requirement of large current required by electrifying starting is met, the utilization rate of power output when the products normally work is improved, and the testing cost is reduced; in addition, the power-on delay protection circuit is provided with an overcurrent protection circuit and an overheat protection circuit, the power supply is automatically cut off when the circuit is in overcurrent or overheat abnormality, the test system is protected, and the power supply is automatically controlled to be connected after the test system is recovered, so that the safety of product test is effectively improved.
To the accomplishment of the foregoing and related ends, one or more aspects of the invention comprise the features hereinafter fully described and particularly pointed out in the claims. The following description and the annexed drawings set forth in detail certain illustrative aspects of the invention. These aspects are indicative, however, of but a few of the various ways in which the principles of the invention may be employed. Further, the present invention is intended to include all such aspects and their equivalents.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent from the following detailed description with reference to the accompanying drawings. In the drawings:
fig. 1 is a schematic circuit diagram of a power-on delay power supply circuit according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of an LDO circuit of a power-on delay power supply circuit according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a power-on delay protection circuit of a power-on delay power supply circuit according to an embodiment of the present invention.
The same reference numbers in all figures indicate similar or corresponding features or functions.
Detailed Description
Various embodiments of the present invention will be described below with reference to the accompanying drawings.
Aiming at the problems of low power utilization rate, extremely high current required at the moment of electrifying, high power manufacturing cost and the like of the conventional power supply for testing the electrifying reliability of the product, the invention realizes the delayed electrifying of the electrified test product by connecting a plurality of paths of LDO circuits in parallel and designing a control circuit module, thereby avoiding the high starting current required by the simultaneous electrifying of the product and improving the output utilization rate of the power supply; in addition, overcurrent and overheat protection is designed on the control circuit module, so that the power supply can run more safely and reliably, and the safety of the power-on reliability test of the product is improved.
The power-on delay power supply circuit provided by the invention comprises an LDO circuit module, a control circuit module and a power supply connection module. The LDO circuit module comprises at least two LDO circuits connected in parallel, and the input voltage is converted into a preset voltage through the LDO circuits; the control circuit module comprises power-on delay protection circuits, the power supply connection module comprises socket circuits which are connected with the power-on delay protection circuits in a one-to-one correspondence mode, the number of the power-on delay protection circuits corresponds to the number of the LDO circuits, preset voltage is input into the power-on delay protection circuits, and the socket circuits connected with the power-on delay protection circuits are controlled to be sequentially powered on through the power-on delay protection circuits.
To describe the power-on delay power supply circuit provided in the present invention in detail, fig. 1 shows a circuit structure of the power-on delay power supply circuit according to an embodiment of the present invention; FIG. 2 shows a structure of an LDO circuit of a power-on delay power supply circuit according to an embodiment of the present invention; fig. 3 shows a structure of a power-on delay protection circuit of a power-on delay power supply circuit according to an embodiment of the present invention.
Specifically, as shown in fig. 1, the LDO circuit module is composed of 5 LDO circuits (LDO 0-LDO 4) connected in parallel. J1 is +5V power input interface, each LDO circuit is connected with a reverse protection diode in series and then connected in parallel to protect the LDO circuit from being damaged after being connected in parallel. Namely: LDO0 is connected in series with reverse protection diode D1, LDO1 is connected in series with reverse protection diode D2, LDO2 is connected in series with reverse protection diode D3, LDO3 is connected in series with reverse protection diode D4, LDO4 is connected in series with reverse protection diode D5, and then each LDO circuit is connected in parallel after passing through its respective reverse protection diode.
The LDO 0-4 are the same LDO circuit, wherein the LDO circuit comprises an LDO chip, a self-recovery fuse, a filter capacitor and a voltage division circuit; the LDO chip is used for converting input voltage into preset voltage; the self-recovery fuse is used for performing overcurrent protection on the LDO circuit; the filter capacitor is used for carrying out filtering processing on the LDO circuit; the voltage division circuit is used for enabling the LDO circuit to output accurate preset voltage. In addition, the LDO circuit may further include a first indication circuit configured to indicate whether an output voltage of the LDO circuit is normal, wherein an LED (Light Emitting Diode) in the first indication circuit is turned on when the output voltage of the LDO circuit is normal.
As shown in fig. 2, in the LDO circuit structure shown in fig. 2, U1 is an LDO chip, and the chip can convert +5V voltage into +4.2V voltage. F1 is a self-recovery fuse, and when the current in the LDO circuit is too large, overcurrent protection can be achieved through F1. For example, when the current flowing through F1 exceeds a predetermined threshold, F1 is in an off state, and when the current returns to normal, F1 returns to the normal on state. The capacitors C11-C13 are filter capacitors to filter interference signals in the LDO circuit, so that the cleanness of a power supply is ensured; r11 and R12 are voltage division circuits, and the two voltage division circuits both adopt 1% of high-precision resistors, so that the LDO circuit can be ensured to output accurate +4.2V voltage; the R13 and the led D7 form a first indicating circuit, and when the LDO output voltage is normal, the led D7 is turned on. Wherein, R13 is used to limit the current flowing through the led D7, thereby protecting the led D7 from being lighted normally.
The input +5V voltage is converted into +4.2V voltage by the LDO circuit and then enters the control circuit module. The CONTROL circuit module is also composed of 5 identical power-on delay protection circuits (CONTROL 0-CONTROL 4) corresponding to the LDO circuits in the LDO circuit module, and the structure of the power-on delay protection circuit is shown in fig. 3.
In the power-on delay protection circuit shown in fig. 3, a power-on delay circuit is composed of a field effect transistor Q1, a triode Q3, a resistor R3, a resistor R8 and a capacitor C3; the resistor R3, the resistor R8 and the capacitor C3 are used for conducting power-on delay control on the socket circuit, and the field-effect tube Q1 achieves on-off control of a power supply under the control of the triode Q3. Specifically, at the moment of electrifying the socket circuit, the capacitor C3 is short-circuited, and the triode Q3 is in a cut-off state, so that the field effect transistor Q1 is controlled to be turned off; after the socket circuit is powered on, the transistor Q3 enters a saturated conduction state, thereby controlling the fet Q1 to conduct. That is, the field effect transistor Q1 is used as a switching device to realize on-off control of the power supply under the control of the triode Q3; resistance R3, resistance R8 and electric capacity C3 realize going up time delay control, and at socket circuit power-on moment, electric capacity C3 is equivalent to the short circuit, and triode Q3 base level voltage is 0V, and triode Q3 is in the off-state to make field effect transistor Q1 turn off the power, along with electric capacity C3's charging, triode Q3 gets into the saturated conducting state, thereby makes field effect transistor Q1 power switch-on. According to the formula of t ═ (R3+ R8) × C3, the size of t is adjusted through device type selection, and therefore sequential power-up of the socket circuit is achieved. For example, when the charging and discharging time of the RC circuit is t ═ 3 to 5 RC, t ═ 3 to 5)1K × (100 uF) is 300ms to 500 ms.
Further, in the above power-on delay protection circuit, the overheat protection circuit is composed of a resistor R4, a resistor R10 and a transistor Q4, the resistor R4 is a CTR resistor, and the over-temperature protection is realized by using the negative resistance abrupt change characteristic of the CTR resistor. That is, the resistor R4 is used to monitor the temperature of the power-on delay protection circuit, and when the temperature of the power-on delay protection circuit exceeds a preset threshold, the transistor Q4 is turned on, and the transistor Q3 is turned off, so as to control the field-effect transistor Q1 to be turned off.
In addition, the power-on delay protection circuit further comprises an overcurrent protection circuit consisting of a resistor R1, a resistor R9, a resistor R7, a triode Q2 and a triode Q5; when the current flowing through the resistor R1 exceeds a preset current threshold, the triode Q2 and the triode Q5 are in a conducting state, the triode Q3 is cut off, and the field effect transistor Q1 is controlled to be turned off. The current threshold is related to the operating voltage of the transistor Q2, for example, when the operating voltage of the transistor Q2 exceeds 0.7V, the transistor Q3 is turned off; when the current flowing through the resistor R1 returns to normal, the transistor Q2 and the transistor Q5 are in a cut-off state, and the transistor Q3 and the field effect transistor Q1 are in a conducting state, so that the power supply is restarted.
Further, the power-on delay protection circuit further comprises a filter circuit, wherein the filter circuit is composed of a capacitor C1 and a capacitor C2 and is used for filtering interference signals in the power-on delay protection circuit and enabling the power-on delay protection circuit to output stable voltage. In addition, the power-on delay protection circuit further comprises a second indicating circuit consisting of a resistor R6 and a diode D6, wherein the second indicating circuit is used for indicating whether the output voltage of the power-on delay protection circuit is normal or not; when the output voltage of the power-on delay protection circuit is normal, the LED in the second indicating circuit is lightened.
In addition, the power-on MODULE also includes 5 socket circuits (MODULE 1-MODULE 5), wherein each socket circuit is connected to a power-on delay protection circuit. That is, MODULE1 is connected to CONTROL0, MODULE2 is connected to CONTROL1, MODULE3 is connected to CONTROL2, MODULE4 is connected to CONTROL3, and MODULE5 is connected to CONTROL4, and the socket circuit is sequentially powered up by controlling the power-up delay protection circuit.
Therefore, the power-on delay power supply circuit provided by the invention has the following advantages:
1. the control circuit module is used for realizing delayed electrification of the product, and the product can be electrified in sequence according to the design of the electrification delay protection circuit in the control circuit module, so that high starting current required by simultaneous electrification is avoided, and the current output by the parallel LDO circuit can be shared after the product is started, so that the LDO circuit is efficiently utilized;
2. the LDO circuit is provided with a self-recovery fuse, when the single LDO circuit has an overcurrent phenomenon, the self-recovery fuse can automatically cut off the power supply to protect the circuit, and the power supply can be continuously supplied after the current is recovered to be normal, so that the power supply can run more safely and more reliably;
3. the power-on delay protection circuit is internally provided with an overcurrent protection circuit, when the power-on delay protection circuit or a detected product has overcurrent abnormality, the overcurrent protection circuit can automatically cut off a power supply so as to protect the detected product, and after the circuit recovers to be normal, the overcurrent protection circuit can automatically recover the power supply, so that the overcurrent abnormality of a single product is protected through the power-on delay protection circuit, and the conditions that an LDO (low dropout regulator) circuit is turned off and the output power of the power supply is influenced are avoided;
4. the power-on delay protection circuit is provided with an overheat protection circuit, when the temperature of the circuit is overhigh, the power supply can be automatically switched off, so that a test system is protected, and the power supply is automatically switched on after the temperature is recovered to be normal, so that the test safety is improved;
5. all be provided with indicating circuit in LDO circuit and last time delay protection circuit, when the test goes wrong, the LED lamp can extinguish to make the tester in time know test system's running state.
Although the embodiments according to the present invention have been described above with reference to the drawings, it will be understood by those skilled in the art that various modifications may be made to the embodiments of the present invention as set forth above without departing from the spirit of the present invention. Therefore, the scope of the present invention should be determined by the contents of the appended claims.
Claims (8)
1. A power-up delay power supply circuit comprising: the LDO circuit module, the control circuit module and the power switch-on module; wherein,
the LDO circuit module comprises at least two LDO circuits connected in parallel, and the input voltage is converted into a preset voltage through the LDO circuits;
the control circuit module comprises power-on delay protection circuits, the power supply connection module comprises socket circuits which are connected with the power-on delay protection circuits in a one-to-one correspondence mode, the number of the power-on delay protection circuits corresponds to the number of the LDO circuits, the preset voltage is input into the power-on delay protection circuits, and the socket circuits connected with the power-on delay protection circuits are controlled to be sequentially powered on through the power-on delay protection circuits;
the LDO circuit also comprises a reverse protection diode which is connected with the LDO circuit in series; wherein,
the number of the reverse protection diodes corresponds to the LDO circuits one by one.
2. The power-on delay power supply circuit of claim 1,
the LDO circuit comprises an LDO chip, a self-recovery fuse, a filter capacitor and a voltage division circuit; wherein,
the LDO chip is used for converting input voltage into preset voltage;
the self-recovery fuse is used for performing overcurrent protection on the LDO circuit;
the filter capacitor is used for filtering the LDO circuit;
the voltage division circuit is used for enabling the LDO circuit to output accurate preset voltage.
3. The power-on delay power supply circuit of claim 2,
the LDO circuit further comprises a first indication circuit for indicating whether an output voltage of the LDO circuit is normal; wherein,
when the output voltage of the LDO circuit is normal, the LED in the first indicating circuit is lightened.
4. The power-on delay power supply circuit of claim 1,
the power-on delay protection circuit comprises a power-on delay circuit consisting of a field effect transistor Q1, a triode Q3, a resistor R3, a resistor R8 and a capacitor C3; wherein,
the resistor R3, the resistor R8 and the capacitor C3 are used for carrying out power-on delay control on the socket circuit, and the field-effect tube Q1 realizes on-off control of a power supply under the control of the triode Q3; wherein,
at the moment of powering on the socket circuit, the capacitor C3 is short-circuited, and the transistor Q3 is in a cut-off state, so that the field effect transistor Q1 is controlled to be turned off;
after the socket circuit is powered on, the transistor Q3 enters a saturation conducting state, thereby controlling the fet Q1 to conduct.
5. The power-on delay power supply circuit of claim 4,
the power-on delay protection circuit comprises an overheat protection circuit consisting of a resistor R4, a resistor R10 and a triode Q4; wherein,
the resistor R4 is used for monitoring the temperature of the power-on delay protection circuit, when the temperature of the power-on delay protection circuit exceeds a preset threshold value, the triode Q4 is switched on, and the triode Q3 is switched off, so that the field effect transistor Q1 is controlled to be switched off.
6. The power-on delay power supply circuit of claim 5, wherein
The power-on delay protection circuit comprises an overcurrent protection circuit consisting of a resistor R1, a resistor R9, a resistor R7, a triode Q2 and a triode Q5; wherein,
when the current flowing through the resistor R1 exceeds a preset current threshold, the transistor Q2 and the transistor Q5 are in a conducting state, the transistor Q3 is cut off, and the field effect transistor Q1 is controlled to be turned off.
7. The power-on delay power supply circuit of claim 6,
the power-on delay protection circuit comprises a filter circuit, and the filter circuit is used for enabling the power-on delay protection circuit to output stable voltage.
8. The power-on delay power supply circuit of claim 7,
the power-on time delay protection circuit comprises a second indicating circuit consisting of a resistor R6 and a diode D6, and the second indicating circuit is used for indicating whether the output voltage of the power-on time delay protection circuit is normal or not; wherein,
and when the output voltage of the power-on time delay protection circuit is normal, the LED in the second indicating circuit is lightened.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710197501.7A CN106997220B (en) | 2017-03-29 | 2017-03-29 | Delayed power circuit |
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| CN201710197501.7A CN106997220B (en) | 2017-03-29 | 2017-03-29 | Delayed power circuit |
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| CN106997220B true CN106997220B (en) | 2019-02-26 |
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| CN1777005A (en) * | 2004-11-17 | 2006-05-24 | 中兴通讯股份有限公司 | DC/DC power source aligument circuit capable of controlling power-on time and order |
| CN101923110B (en) * | 2009-06-09 | 2012-08-22 | 比亚迪股份有限公司 | Method and device for detecting abnormal current of circuit |
| TWI424301B (en) * | 2009-12-24 | 2014-01-21 | Richwave Technology Corp | Voltage regulator which provides sequentially and arbitrarrily shaped regulated voltage and related method |
| CN102593790B (en) * | 2011-01-05 | 2015-01-07 | 海洋王照明科技股份有限公司 | Lighting fixture overheating protection circuit and lighting fixture thereof |
| CN103683909A (en) * | 2013-12-27 | 2014-03-26 | 广东威创视讯科技股份有限公司 | Display system, power supply method and power supply device thereof |
| CN103760939B (en) * | 2014-01-15 | 2015-12-09 | 小米科技有限责任公司 | Power source supply method, power-supplying circuit, power supply and terminal device |
| US9478977B2 (en) * | 2014-05-27 | 2016-10-25 | Skyworks Solutions, Inc. | Overcurrent protection device and overcurrent protection method for electronic modules |
| CN204668922U (en) * | 2015-05-08 | 2015-09-23 | 深圳长城科美技术有限公司 | A kind of module power supply short-circuit protective circuit |
| CN105356422A (en) * | 2015-10-22 | 2016-02-24 | 上海斐讯数据通信技术有限公司 | Method and system for preventing overcurrent and overvoltage damages in test of electronic equipment |
| CN205231726U (en) * | 2015-12-02 | 2016-05-11 | 深圳怡化电脑股份有限公司 | Power protection circuit with go up electric protection |
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