CN109217665B - Driving signal enhancing circuit - Google Patents
Driving signal enhancing circuit Download PDFInfo
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- CN109217665B CN109217665B CN201811252443.4A CN201811252443A CN109217665B CN 109217665 B CN109217665 B CN 109217665B CN 201811252443 A CN201811252443 A CN 201811252443A CN 109217665 B CN109217665 B CN 109217665B
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- 230000002708 enhancing effect Effects 0.000 title claims description 15
- 239000003990 capacitor Substances 0.000 claims abstract description 29
- 230000002265 prevention Effects 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 2
- 229920006395 saturated elastomer Polymers 0.000 abstract description 14
- 230000000694 effects Effects 0.000 abstract description 9
- 238000007599 discharging Methods 0.000 description 5
- 230000009471 action Effects 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000007480 spreading Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Power Conversion In General (AREA)
- Electronic Switches (AREA)
Abstract
The invention provides a drive signal enhancement circuit, which is applied between a boost pin BOS of a control IC and a base electrode of a triode in a low-voltage direct-connection loop of a starting circuit, and realizes triode drive signal enhancement by utilizing the charge and discharge effect of a capacitor C3, so that a PNP triode Q1B only works in a saturated conduction (or approaching to saturated conduction) or cut-off state when an air switch or a relay is started under different input voltages, and the voltage of a power supply end of the control IC can reach an opening value. The invention has simple circuit and low realization cost, and innovatively avoids the starting dead zone of the original low-voltage direct-connection loop. Meanwhile, the circuit only works when the control IC BOS pin works and the PNP triode Q1B is conducted, and the normal steady-state operation of the system is not influenced.
Description
Technical Field
The present invention relates to a driving signal enhancing circuit, and more particularly, to a triode driving signal enhancing circuit.
Background
In the switch power supply applied to a wide voltage input range, a starting circuit needs to meet the functions of low-voltage direct connection and high-voltage limitation simultaneously, namely, the low-voltage power supply can directly take power from the input voltage to supply power to a power supply end of a control IC, and the high-voltage power supply can protect the control IC at the rear end from overvoltage or damage by bearing a potential difference.
In an ultra-wide voltage input power supply, a starting circuit comprises a high-voltage limiting loop formed by a starting circuit chip and a low-voltage through loop formed by two PNP triodes so as to meet the input range of 4.5-36 VDC. The invention relates to a low-voltage through circuit consisting of two PNP triodes, and a high-voltage limiting circuit is not further described. In the low-voltage through loop, the PNP transistor Q1B can be saturated on below a certain voltage point through parameter setting, and enter an off state above a certain voltage point. It should be noted that, at low voltage, the input voltage cannot reach the voltage on value of the power supply terminal of the control IC, so a primary BOOST circuit is generally connected in series between the low voltage through-loop and the power supply terminal of the control IC. When the BOOST pin BOS of the control IC is in non-suspended or grounded low voltage, if the power supply end of the IC is in under-voltage locking, the BOOST circuit of the BOOST circuit starts to work. The saturated turn-on of PNP transistor Q1B ensures that the input of the BOOST circuit has sufficient voltage and current to enable the control IC supply voltage to reach its on value.
When the PNP transistor Q1B in the low-voltage through loop is in a conducting state (saturated or amplified state), the EC voltage of the PNP transistor Q1A is clamped at a PN junction voltage, and at this time, the PNP transistor Q1A is in an amplified or cut-off state depending on whether the EB voltage reaches a threshold value. When the input voltage is gradually increased to the point that the PNP triode Q1A starts to be conducted, the EC channel of the PNP triode Q1A can divide a part of the base-level current of the PNP triode Q1B, and the base-level current of the PNP triode Q1A can be increased along with the continuous increase of the input voltage, and before the PNP triode Q1B does not enter a saturated state, the base-level current of the PNP triode Q1B is gradually reduced, the PNP triode Q1B is gradually turned off from the saturated state, the emitter voltage is gradually reduced, so that the BOOST of the rear end BOOST cannot reach the starting value of the control IC power supply voltage, and at the moment, the air switch or the relay is electrified, and the system cannot be started normally.
Disclosure of Invention
In view of this, the present invention provides a circuit for enhancing the triode driving signal, which can increase the base current of the PNP triode Q1B to shift to the saturation state, and has a positive feedback effect, so that the emitter voltage can meet the control IC supply voltage starting value after BOOST by the back-end BOOST.
The invention is realized by the following technical scheme:
a drive signal enhancing circuit is applied between a boost pin BOS of a control IC and a base electrode of a triode in a low-voltage through loop of a starting circuit, and is characterized in that: the device comprises a base-stage current spreading circuit and a reverse overvoltage prevention diode; the positive electrode of the reverse overvoltage prevention diode is connected with the base electrode of the triode, the negative electrode of the reverse overvoltage prevention diode is connected with one end of the base-stage current-spreading circuit, and the other end of the base-stage current-spreading circuit is connected with the boost pin BOS of the control IC.
Preferably, the base-stage current-spreading circuit comprises a charging capacitor C3; one end of the charging capacitor C3 is connected with a boost pin BOS of the control IC, and the other end of the charging capacitor C is connected with a cathode of the reverse overvoltage prevention diode.
Preferably, the current charging the charging capacitor C3 is an enhanced drive signal that causes the transistor operating state to go toward saturation.
Preferably, the drive signal enhancing circuit further comprises a bleeder circuit connected between the cathode of the reverse overvoltage protection diode and ground.
Preferably, the bleeder circuit includes a bleeder resistor R4, one end of the bleeder resistor R4 is connected to the cathode of the reverse overvoltage preventing diode, and the other end of the bleeder resistor R4 is connected to the ground.
The working principle of the invention is as follows: in an ultra-wide voltage input power supply, a starting circuit comprises a high-voltage limiting loop formed by a starting circuit chip and a low-voltage through loop formed by two PNP triodes so as to meet the input range of 4.5-36 VDC. In the low-voltage through loop, the PNP transistor Q1B can be saturated on below a certain voltage point through parameter setting, and enter an off state above a certain voltage point. Under low voltage, the input voltage can not reach the voltage starting value of the power supply end of the control IC, and a primary BOOST circuit is generally connected in series between the low voltage direct-connection loop and the power supply end of the control IC. The saturated turn-on of PNP transistor Q1B ensures that the input of the BOOST circuit has sufficient voltage and current to enable the control IC supply voltage to reach its on value. It can be seen that when the PNP transistor Q1B is in the on state (saturated or amplified state), the EC voltage of the PNP transistor Q1A is clamped at a PN junction voltage, and the PNP transistor Q1A is in the amplified or off state depending on whether the EB voltage reaches a threshold value. Without the circuit of the present invention, when the input voltage gradually increases to the point that the PNP transistor Q1A starts to turn on, the EC path of the PNP transistor Q1A will divide a part of the base current of the PNP transistor Q1B, and since the base current of the PNP transistor Q1A is small when just turned on, the PNP transistor Q1A is in an amplified state, and the EC pole is clamped at a PN junction voltage drop because the PNP transistor Q1B is still in a turned-on state. As the input voltage continues to increase, the base current of PNP transistor Q1A increases, and the current split to the base current of PNP transistor Q1B increases gradually until PNP transistor Q1A enters a saturated state when the base current of PNP transistor Q1A is greater than one- β of the collector current, thereby forming a short circuit between ECs of PNP transistor Q1B, and turning off PNP transistor Q1B. From the above analysis, it can be seen that the PNP transistor Q1B gradually transitions from saturated on to off in the process of turning off the PNP transistor Q1A to saturated on. Therefore, when two triodes are conducted in a certain input voltage interval, the PNP triode Q1B approaches to a cut-off state, the collector voltage of the PNP triode Q1B cannot reach the power supply end starting value of the rear-end control IC even though the collector voltage is boosted by the BOOST circuit, and at the moment, an air switch or a relay is electrified, so that the system cannot be started normally. The invention realizes the function of enhancing the control current of the base level of the PNP triode Q1B by establishing a passage between the base level of the PNP triode Q1B and the BOS pin of the control IC and charging and discharging the switch function of the control IC BOS pin to the ground.
The invention adopts a capacitor charge-discharge mode to enhance triode base level control current, and has the following remarkable characteristics:
1. the control current of the triode base level is obviously increased, and the problem that the normal starting is not realized due to the fact that the collector voltage of the PNP triode Q1B is reduced because the PNP triode Q1B enters an amplifying state is solved;
2. the capacitive coupling mode is adopted to play a role in blocking and prevent the interference of coupling input voltage to the rear-end control IC under high voltage;
3. only when the BOS pin of the control IC works and the PNP triode Q1B is conducted, the circuit of the invention starts to work, and the circuit of the invention is not mutually influenced by other functional circuits of the starting circuit, so that the normal work of the system is not influenced;
4. all input conditions of starting through the low-voltage direct-connection loop are that the conducting capacity of the PNP triode Q1B is enhanced when the power-on machine is started, so that the design allowance is facilitated, and the power and the packaging required by the current-limiting resistor R3 are reduced;
5. charging the charging capacitor C3 increases the collector voltage of the PNP triode Q1B, the collector voltage of the PNP triode Q1B is increased to further increase the BOS pin voltage, and the BOS pin voltage is increased to enhance the discharging effect of the capacitor, so that the charging effect of the capacitor in the next period is enhanced, the PNP triode Q1B is further promoted to deviate to a saturated state, and the collector voltage of the PNP triode Q1B, the BOS pin voltage and the voltage of the power supply end of the control IC are continuously increased to have the positive feedback effect.
Drawings
FIG. 1 is a schematic diagram of a prior art low voltage pass-through loop circuit of a start-up circuit;
FIG. 2 shows a first embodiment of the invention applied in a low pressure feed-through circuit;
fig. 3 shows a second embodiment of the invention applied in a low-pressure feed-through circuit.
Detailed Description
First embodiment:
fig. 2 shows a first embodiment of the application of the invention.
The invention has the following 6 characteristics:
1. the circuit is simple, and the device cost is low;
2. isolating the direct current signal;
3. the positive feedback effect is realized, and the driving signal is gradually enhanced;
4. only when the control IC BOS pin works and the PNP triode Q1B is conducted, the normal operation of the system is not influenced;
5. is not affected by the temperature characteristics and tolerance of the device;
6. the reverse overvoltage prevention diode is used for avoiding the problem of stress caused by lifting of the base level of the PNP triode Q1B during discharging, and the PNP triode Q1B is in a cut-off state.
A drive signal enhancing circuit is applied between a boost pin BOS of a control IC and a base electrode of a triode in a low-voltage through loop of a starting circuit and is used for enhancing the base current of the triode so as to enhance the conduction capacity of the triode, and comprises a base-stage current expanding circuit, an anti-reverse overvoltage diode and a bleeder circuit; the base-stage current-expanding circuit forms a current-expanding branch between a boost pin BOS of the control IC and a base-stage of the PNP triode Q1B; the reverse overvoltage prevention diode D3 is connected in series between the triode base stage and the base stage current expansion circuit; the charging current to the charging capacitor C3 is an enhanced driving signal; the current limiting resistor R3 provides a discharge path in a charge capacitor discharge period; the enhanced drive signal causes the transistor operating state to tend to saturate.
Preferably, the base-stage current-spreading circuit comprises a charging capacitor C3; one end of the charging capacitor C3 is connected with a boost pin BOS of the control IC, and the other end of the charging capacitor C is connected with a cathode of the reverse overvoltage prevention diode D3.
Preferably, the reverse overvoltage preventing diode comprises a diode D3; an anode of the diode D3 is connected with a base stage of the PNP triode Q1B, and a cathode of the diode D3 is connected with one end of the charging capacitor C3.
Preferably, the bleeder circuit uses a current limiting resistor R3 in the original circuit, one end of the current limiting resistor R3 is connected with the cathode of the diode D3 and the base of the PNP triode Q1B, and the other end is connected to ground.
The working principle of the invention is now described below with reference to fig. 2:
and (3) performing air switching or relay starting in an input voltage interval in which the two triodes are simultaneously conducted, and controlling the IC BOS pin to start working due to the fact that the collector voltage of the PNP triode Q1B is detected, namely performing periodic switching action on the ground at a certain frequency. When the control IC BOS pin is grounded, the base level of the PNP triode Q1B charges the charging capacitor C3 through the diode D3, at the moment, the base level current and the EC level voltage of the PNP triode Q1A are certain, the collector current of the PNP triode Q1A is basically unchanged according to the triode output characteristic curve, the charging current of the charging capacitor C3 is mainly provided by the base level of the PNP triode Q1B, so that the PNP triode Q1B shifts to a saturation region, the collector voltage rises, and meanwhile, the voltage of the charging capacitor C1 is boosted through the inductor L1, and the voltage of the control IC BOS pin rises. Then the internal switch of the control IC BOS pin is disconnected, and the charging capacitor C3 discharges through the current-limiting resistor R3, so that the effect of continuously enhancing the driving signal of the PNP triode Q1B can be realized by continuously charging the charging capacitor C3 when the internal switch of the control IC BOS pin is closed to the ground again. Because the charging capacitor C3 has a low impedance characteristic for the ac signal, the discharging period can be regarded as a short circuit, and the reverse overvoltage preventing diode D3 needs to be added between the base of the PNP triode Q1B and the charging capacitor C3 to prevent the high voltage of the control IC BOS pin from being directly introduced into the base of the PNP triode Q1B to damage the same. Meanwhile, according to the analysis, as the voltage of the inductor L1 rises from cycle to cycle, the discharging effect of the C3 is gradually enhanced, so that the charging current of the inductor is indirectly increased from cycle to cycle, and the positive feedback effect is achieved on enhancing the driving signal of the PNP triode Q1B, so that the inductor can rapidly move to a saturation region. After the collector voltage of the PNP triode Q1B is boosted by the BOOST circuit, the voltage of the power supply end of the control IC rapidly reaches the starting value, and the system is started normally. Then the system is powered by the auxiliary power supply winding, the action of the control IC BOS pin on the ground switch is stopped, and the on state of the PNP triode Q1B is recovered to be close to the off state, but no influence is generated on the system.
Second embodiment:
fig. 2 shows a second embodiment of the application of the invention.
One end of the charging capacitor C3 of this embodiment is connected to the boost pin BOS of the control IC, and the other end is connected to the cathode of the reverse overvoltage preventing diode D3. An anode of the diode D3 is connected with a base stage of the PNP triode Q1B, and a cathode of the diode D3 is connected with one end of the charging capacitor C3. One end of the bleeder resistor R4 is connected to the cathode of the diode D3 and the other end is connected to ground.
The operation principle of the present embodiment is the same as that of the first embodiment, and only the operation principle of the bleeder circuit will be described below:
during the off period of the internal switch of the control IC BOS pin, the capacitor C3 discharges via the bleeder resistor R4, and the bleeder resistor R4 also serves as a part of the collector current limiting resistor of the PNP transistor Q1A.
The present embodiment also has 6 beneficial effects of the first embodiment, and is not described herein.
It should be noted that the above-mentioned preferred embodiments should not be regarded as limiting the invention, and that it will be apparent to those skilled in the art that several modifications and adaptations can be made without departing from the spirit and scope of the invention, and that these modifications and adaptations should and are intended to be comprehended within the scope of the invention as set forth in the following claims.
Claims (4)
1. The drive signal enhancement circuit is applied between a boost pin BOS of a control IC and a base electrode of a triode in a low-voltage through loop of a starting circuit, and the starting circuit comprises a high-voltage limiting loop formed by a starting circuit chip and a low-voltage through loop formed by two PNP triodes; the method is characterized in that: the device comprises a base electrode current-expanding circuit and a reverse overvoltage-preventing diode; the base electrode current-spreading circuit comprises a charging capacitor C3; the positive pole of the reverse overvoltage prevention diode is connected with the base electrode of one triode and the collector electrode of the other triode, the negative pole of the reverse overvoltage prevention diode is connected with one end of a charging capacitor C3, and the other end of the charging capacitor C3 is connected with a boost pin BOS of the control IC.
2. The drive signal enhancing circuit of claim 1, wherein: the current charging the charging capacitor C3 is an enhanced drive signal that causes the transistor operating state to go to saturation.
3. The drive signal enhancing circuit of claim 2, wherein: the anti-reverse overvoltage diode also comprises a bleeder circuit which is connected between the cathode of the anti-reverse overvoltage diode and the ground.
4. A drive signal enhancing circuit according to claim 3, wherein: the bleeder circuit include bleeder resistor R4, bleeder resistor R4's one end is connected the negative pole of preventing reverse overvoltage diode, bleeder resistor R4's the other end is connected to ground.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811252443.4A CN109217665B (en) | 2018-10-25 | 2018-10-25 | Driving signal enhancing circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811252443.4A CN109217665B (en) | 2018-10-25 | 2018-10-25 | Driving signal enhancing circuit |
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| CN109217665A CN109217665A (en) | 2019-01-15 |
| CN109217665B true CN109217665B (en) | 2024-04-12 |
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| CN114488873B (en) * | 2021-12-24 | 2024-05-03 | 深圳市联洲国际技术有限公司 | Control circuit and device |
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