CN109254188B - High-speed current detection circuit suitable for switching power supply - Google Patents
High-speed current detection circuit suitable for switching power supply Download PDFInfo
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- CN109254188B CN109254188B CN201811170641.6A CN201811170641A CN109254188B CN 109254188 B CN109254188 B CN 109254188B CN 201811170641 A CN201811170641 A CN 201811170641A CN 109254188 B CN109254188 B CN 109254188B
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- 238000001514 detection method Methods 0.000 title claims abstract description 126
- 239000003990 capacitor Substances 0.000 claims abstract description 12
- 238000012031 short term test Methods 0.000 claims 1
- 230000035484 reaction time Effects 0.000 abstract description 5
- 230000036632 reaction speed Effects 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0092—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring current only
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Abstract
The invention relates to a quick detection circuit suitable for a switching power supply current, which is formed by connecting current source tubes MN1 and MN2, current mirrors MP1 and MP2, a detection current output MOS tube MP3, a detection tube Ms, an HS PowerMOS power tube, an LS PowerMOS power tube, a detection resistor Rsi, an output resistor Rso, a detection resistor K, a resistor RM and a compensation capacitor Cg. The invention has simple and reasonable structural design and higher reaction speed, reduces the period minimum on time, the minimum duty ratio and the minimum output voltage of the current mode switching power supply, improves the load jump characteristic and the like, and accelerates the reaction time of a current protection mechanism in the switching power supply chip circuits of other modes.
Description
Technical Field
The invention belongs to the field of analog integrated circuits, and particularly relates to a circuit suitable for rapidly detecting current of a switching power supply.
Background
The switching power supply circuit is widely used in various electronic products and handheld devices due to the high efficiency. The output current detection circuit of the power tube of the switching power supply is a necessary circuit of a current mode switching power supply chip, and the working speed and the performance of the circuit directly influence the period minimum on time, the minimum duty ratio, the minimum output voltage, the load jump characteristic and the like of the current mode switching power supply; in other switching power supply chip circuits, a current detection circuit is also needed as a protection mechanism for the chip, so that the chip is prevented from being damaged due to overlarge current.
Because the voltage of the current detection node of the traditional switching power supply jumps with the switching frequency, the direct current working point needs to be reestablished when the current detection circuit detects the current in each period, so that the detection speed is slow, and the minimum conduction time and the minimum output voltage of the whole switching power supply are affected.
As shown in fig. 3, a typical buck switching power supply power tube current detection circuit includes a hsrowmos power tube and a LS PowerMOS power tube, which are alternately turned on in one clock period under the control of control signals HSG and LSG. The current detection transimpedance amplifier comprises current sources MN1 and MN2, VB are bias voltages, current mirrors MP1 and MP2 have the same size, a detection current output MOS tube MP3, a compensation capacitor Cg, two identical detection resistors Rsi and an output resistor Rso. When the HS PowerMOS power tube is conducted, the output voltage of the current detection circuit is as follows:
wherein RdsonH is the on-resistance of the HS PowerMOS power tube, IL is the current flowing in the HS PowerMOS power tube, vs is the current detection output voltage, and is in a fixed proportional relationship with the power tube current IL.
The disadvantage of the circuit shown in fig. 3 is that, in each switching cycle, when the LS PowerMOS power transistor is turned on and the hsrowmos power transistor is turned off, the switching node SW is at a low level, the current mirror MP2 in the current detection circuit will be in an off state, the current mirror MP3 is fully turned on, and the output voltage vs=vdd×rsi/Rso. When LS PowerMOS is turned off and HS PowerMOS is turned on, the SW voltage jumps to VDD-IL RdsonH, the current detection circuit needs to reestablish the working point, and when the current mirror MP2 detects that the current output MOS tube MP3 works normally, the output voltage Vs of the circuit is in a fixed proportional relation with IL as shown in the above formula; in the period of time from the HS PowerMOS conduction to the normal establishment of the working point of the current detection circuit, the output voltage Vs cannot be used as the normal voltage for the control circuit of the switching power supply chip; this will affect the cycle minimum on-time, minimum duty cycle, minimum output voltage, load jump characteristics, etc. of the current-mode switching power supply as well as the reaction time of the current protection mechanism in other modes of switching power supply chip circuits.
Disclosure of Invention
In order to solve the problems in the background technology, the invention provides a circuit suitable for rapidly detecting the current of a switching power supply, which has simple and reasonable structural design and higher reaction speed, reduces the period minimum on time, the minimum duty cycle and the minimum output voltage of a current mode switching power supply, improves the load jump characteristic and the like, and accelerates the reaction time of a current protection mechanism in a switching power supply chip circuit of other modes.
The technical scheme of the invention is as follows:
the circuit for rapidly detecting the current of the switching power supply is formed by connecting current source tubes MN1 and MN2, current mirrors MP1 and MP2, a detection current output MOS tube MP3, a detection tube Ms, an HS PowerMOS power tube, an LSPowerMOS power tube, a detection resistor Rsi, an output resistor Rso, a detection resistor K x Rsi, a resistor RM and a compensation capacitor Cg;
the source electrode of the LS PowerMOS power tube is grounded, the drain electrode of the LS PowerMOS power tube is connected with the output port SW of the switching power supply chip, and the grid electrode of the LS PowerMOS power tube is connected with the output port LSG of the switching power supply control circuit; the source electrode of the HS PowerMOS power tube is connected with the output port SW of the switching power supply chip, the drain electrode of the HS PowerMOS power tube is connected with the input power supply port VDD of the switching power supply chip, and the grid electrode of the HS PowerMOS power tube is connected with the output port HSG of the switching power supply control circuit; the source of the detection tube Ms is connected with the output port SW of the switch power supply chip, and the drain is connected with the resistor RM and passes through the resistor R M The grid electrode of the switching power supply control circuit is connected with the output port HSG of the switching power supply control circuit; the drain electrode of the current mirror MP1 is connected with the drain electrode of the current source tube MN1, the source electrode of the current mirror MP1 is connected with the detection resistor Rsi and is connected with the input power port VDD of the switching power supply chip through the detection resistor Rsi, and the grid electrode of the current mirror MP1 is connected with the drain electrode of the current source tube MN 1; the source electrode of the current source tube MN1 is grounded, and the grid electrode is connected with the bias voltage end VB; the drain electrode of the current mirror MP2 is connected to the drain electrode of the current source tube MN2, the source electrode of the current mirror MP2 is connected to the detection resistor k×rsi and is connected to the drain electrode of the detection tube Ms and the resistor R through the detection resistor k×rsi M Is a connection point of (2); the source electrode of the current source tube MN2 is grounded; the drain electrode of the detection current output MOS tube MP3 is connected with the output resistor Rso and is grounded through the output resistor Rso, a current detection circuit output voltage end Vs is led out between the drain electrode of the detection current output MOS tube MP3 and the output resistor Rso, the grid electrode of the detection current output MOS tube MP3 is connected with the source electrode of the current mirror MP2 and the drain electrode of the current source tube MN2, and the source electrode of the detection current output MOS tube MP3 is connected with the connection point of the drain electrode of the current mirror MP1 and the detection resistor Rsi; one end of the compensation capacitor Cg is connected with the power supply VDD, and the other end is connected with the gate of the detection current output MOS tube MP 3.
The relation between the output voltage Vs and the power tube current IL when the current detection circuit works normally is as follows:
in the above formula, rdsonMs is the on-resistance of the detection tube Ms, IB is the bias current flowing through the current source tubes MN1 and MN 2; in the above equation, (k+1) ib×rso is the output voltage generated by the intentionally introduced mismatch, (RdsonH/Rsi) × (RdsonMs/(rdsonms+rm)) is in fixed proportion to the power transistor current IL.
The beneficial effects are that:
the invention is suitable for the rapid detection circuit of the switching power supply current, has simple and reasonable structural design, greatly improves the current detection speed by introducing a detection tube Ms and a resistor RM and specially introducing the mismatch of the detection resistor on the basis of the traditional typical current detection circuit, reduces the period minimum on time, the minimum duty cycle and the minimum output voltage of the current mode switching power supply, improves the load jump characteristic and the like, and quickens the reaction time of a current protection mechanism in other modes of switching power supply chip circuits.
The specific advantages are realized in the following points:
(1) The position of the traditional current detection point is changed by a detection tube Ms which is equal to the HS PowerMOS power tube and a resistor R M The method realizes that the voltage of the detection point only slightly changes in each period;
(2) By adding fixed mismatch to the detection amplifier (namely, the detection amplifier is formed by current source tubes MN1 and MN2, current mirrors MP1 and MP2, a detection current output MOS tube MP3, a detection resistor Rsi, an output resistor Rso, a detection resistor K x Rsi and a compensation capacitor Cg), each device of the detection circuit is always in a working state;
(3) The periodic establishment of a direct current working point of the current detection circuit is avoided, so that the working speed of the current detection circuit is improved.
Drawings
FIG. 1 is a circuit diagram of a switching power supply current fast detection circuit according to the present invention;
FIG. 2 is a circuit diagram of embodiment 1 of the present invention suitable for a switching power supply current fast detection circuit;
fig. 3 is a circuit diagram of a typical buck switching power supply power tube current detection circuit.
Detailed Description
As shown in fig. 1, the invention is suitable for a fast detection circuit of a switching power supply current, and is formed by connecting current source tubes MN1 and MN2, current mirrors MP1 and MP2, a detection current output MOS tube MP3, a detection tube Ms, an HS PowerMOS power tube, an LS PowerMOS power tube, a detection resistor Rsi, an output resistor Rso, a detection resistor k×rsi, a resistor RM and a compensation capacitor Cg.
The source electrode of the LS PowerMOS power tube is grounded, the drain electrode of the LS PowerMOS power tube is connected with the output port SW of the switching power supply chip, and the grid electrode of the LS PowerMOS power tube is connected with the output port LSG of the switching power supply control circuit; the source electrode of the HS PowerMOS power tube is connected with the output port SW of the switching power supply chip, the drain electrode is connected with the input power supply port VDD of the switching power supply chip, and the grid electrode is connected with the output port HSG of the switching power supply control circuit; the source of the detection tube Ms is connected with the output port SW of the switch power supply chip, and the drain is connected with the resistor RM and passes through the resistor R M The grid electrode of the switching power supply control circuit is connected with the output port HSG of the switching power supply control circuit; the drain electrode of the current mirror MP1 is connected with the drain electrode of the current source tube MN1, the source electrode of the current mirror MP1 is connected with the detection resistor Rsi and is connected with the input power supply port VDD of the switching power supply chip through the detection resistor Rsi, and the grid electrode of the current mirror MP1 is connected with the drain electrode of the current source tube MN 1; the source electrode of the current source tube MN1 is grounded, and the grid electrode is connected with the bias voltage end VB; the drain electrode of the current mirror MP2 is connected to the drain electrode of the current source tube MN2, and the source electrode of the current mirror MP2 is connected to the detection resistor k×rsi and is connected to the connection point of the drain electrode of the detection tube Ms and the resistor RM through the detection resistor k×rsi; the source electrode of the current source tube MN2 is grounded; the drain electrode of the detection current output MOS tube MP3 is connected with the output resistor Rso and is grounded through the output resistor Rso, a current detection circuit output voltage end Vs is led out between the drain electrode of the detection current output MOS tube MP3 and the output resistor Rso, and the grid electrode and the current of the detection current output MOS tube MP3The source electrode of the mirror MP2 is connected with the drain electrode of the current source tube MN2, and the source electrode of the detection current output MOS tube MP3 is connected with the connection point of the drain electrode of the current mirror MP1 and the detection resistor Rsi; one end of the compensation capacitor Cg is connected with the power supply VDD, and the other end is connected with the grid electrode of the detection current output MOS tube MP 3.
As shown in fig. 1, the invention adds a detection tube Ms proportional to the size of the HS PowerMOS power tube on the basis of the conventional circuit, wherein the size of the detection tube Ms is 1/N (N is an integer far greater than 1) of the HS PowerMOS power tube, and a resistor RM connected in series with the detection tube Ms, and changes the detection resistor connected with a current mirror MP2 into K x Rsi (K is a positive number slightly greater than 1); when the LS PowerMOS power tube is turned on and the HSPOWERMOS power tube is turned off in each switching period, two input ends of the current detection circuit are both power supply VDD, the current mirror MP2 will not be in an off state, and because the detection resistor deliberately introduces tiny mismatch, the detection current output MOS tube MP3 is still in a linear working area, and tiny current flows; when the LS PowerMOS power tube is turned off and the HS PowerMOS power tube is turned on, the current detection circuit does not need to reestablish a working point, so that the establishment time of the output voltage Vs is greatly shortened, and the relationship between the output voltage Vs and the HS PowerMOS power tube current IL when the current detection circuit works normally is as follows:
in the above formula, rdsonMs is the on-resistance of the detection tube Ms, IB is the bias current flowing through the current source tubes MN1 and MN 2; in the above equation, (k+1) ib×rso is the output voltage generated by the intentionally introduced mismatch, (RdsonH/Rsi) × (RdsonMs/(rdsonms+rm)) is in fixed proportion to the power transistor current IL.
Example 1
As shown in FIG. 2, the invention is suitable for a rapid detection circuit of switching power supply current, and is formed by connecting current source tubes MN1 and MN2, current mirrors MP1 and MP2, a detection current output MOS tube MP3, a detection tube Ms, an HS PowerMOS power tube, an LS PowerMOS power tube, a detection resistor Rsi1, an output resistor Rso, a detection resistor Rsi2, a resistor RM and a compensation capacitor Cg.
The source electrode of the LS PowerMOS power tube is grounded, the drain electrode of the LS PowerMOS power tube is connected with the output port SW of the switching power supply chip, and the grid electrode of the LS PowerMOS power tube is connected with the output port LSG of the switching power supply control circuit; the source electrode of the HS PowerMOS power tube is connected with the output port SW of the switching power supply chip, the drain electrode is connected with the input power supply port VDD of the switching power supply chip, and the grid electrode is connected with the output port HSG of the switching power supply control circuit; the source electrode of the detection tube Ms is connected with the output port SW of the switch power supply chip, the drain electrode of the detection tube Ms is connected with the resistor RM and the input power supply port VDD of the switch power supply chip through the resistor RM, and the grid electrode of the detection tube Ms is connected with the output port HSG of the switch power supply control circuit; the drain electrode of the current mirror MP1 is connected with the drain electrode of the current source tube MN1, the source electrode of the current mirror MP1 is connected with the detection resistor Rsi1 and is connected with the input power supply port VDD of the switching power supply chip through the detection resistor Rsi1, and the grid electrode of the current mirror MP1 is connected with the drain electrode of the current source tube MN 1; the source electrode of the current source tube MN1 is grounded, and the grid electrode is connected with the bias voltage end VB; the drain electrode of the current mirror MP2 is connected with the drain electrode of the current source tube MN2, and the source electrode of the current mirror MP2 is connected with the detection resistor Rsi2 and is connected with the connection point of the drain electrode of the detection tube Ms and the resistor RM through the detection resistor Rsi 2; the source electrode of the current source tube MN2 is grounded; the drain electrode of the detection current output MOS tube MP3 is connected with the output resistor Rso and is grounded through the output resistor Rso, a current detection circuit output voltage end Vs is led out between the drain electrode of the detection current output MOS tube MP3 and the output resistor Rso, the grid electrode of the detection current output MOS tube MP3 is connected with the source electrode of the current mirror MP2 and the drain electrode of the current source tube MN2, and the source electrode of the detection current output MOS tube MP3 is connected with the connection point of the drain electrode of the current mirror MP1 and the detection resistor Rsi 1; one end of the compensation capacitor Cg is connected with the power supply VDD, and the other end is connected with the grid electrode of the detection current output MOS tube MP 3.
The invention has simple and reasonable structural design and higher reaction speed, reduces the period minimum on time, the minimum duty ratio and the minimum output voltage of the current mode switching power supply, improves the load jump characteristic and the like, and accelerates the reaction time of a current protection mechanism in the switching power supply chip circuits of other modes.
Claims (1)
1. The utility model provides a be applicable to switching power supply electric current short-term test circuit which characterized in that:
the detection circuit comprises current source tubes MN1 and MN2, current mirrors MP1 and MP2, a detection current output MOS tube MP3 and a detection tube M s HS PowerMOS power tube, LS PowerMOS power tube and detection resistor R si Output resistor R so Detection resistor K R si Resistance R M And a compensation capacitor Cg are connected;
the source electrode of the LS PowerMOS power tube is grounded, the drain electrode of the LS PowerMOS power tube is connected with the output port SW of the switching power supply chip, and the grid electrode of the LS PowerMOS power tube is connected with the output port LSG of the switching power supply control circuit;
the source electrode of the HS PowerMOS power tube is connected with the output port SW of the switching power supply chip, the drain electrode of the HS PowerMOS power tube is connected with the input power supply port VDD of the switching power supply chip, and the grid electrode of the HS PowerMOS power tube is connected with the output port HSG of the switching power supply control circuit;
the source electrode of the detection tube Ms is connected with the output port SW of the switch power supply chip, the drain electrode of the detection tube Ms is connected with the resistor RM and is connected with the input power supply port VDD of the switch power supply chip through the resistor RM, and the grid electrode of the detection tube Ms is connected with the output port HSG of the switch power supply control circuit;
the drain electrode of the current mirror MP1 is connected with the drain electrode of the current source tube MN1, and the source electrode of the current mirror MP1 is connected with the detection resistor R si And pass through the detection resistor R si The grid electrode of the current mirror MP1 is connected with the drain electrode of the current source tube MN 1;
the source electrode of the current source tube MN1 is grounded, and the grid electrode is connected with the bias voltage end VB;
the drain electrode of the current mirror MP2 is connected with the drain electrode of the current source tube MN2, and the source electrode of the current mirror MP2 is connected with the detection resistor K x R si And pass through the detection resistor K si Is connected to the detecting tube M s Drain of (d) and resistor R M Is a connection point of (2); the source electrode of the current source tube MN2 is grounded;
the drain electrode of the detection current output MOS tube MP3 is connected with the output resistor R so And through the output resistor R so The drain electrode of the detection current output MOS tube MP3 is grounded and the output resistor R so The current is led out from the circuitVoltage outlet terminal V s The grid electrode of the detection current output MOS tube MP3 is connected with the source electrode of the current mirror MP2 and the drain electrode of the current source tube MN2, and the source electrode of the detection current output MOS tube MP3 is connected with the drain electrode of the current mirror MP1 and the detection resistor R si Is a connection point of (2);
one end of the compensation capacitor Cg is connected with a power supply VDD, and the other end of the compensation capacitor Cg is connected with the grid electrode of the detection current output MOS tube MP 3;
the current detection circuit outputs voltage V during normal operation s And power tube current I L The relation of (2) is:
；
r in the above formula dsonMs To detect the on-resistance of the tube Ms, I B Bias currents flowing through the current source tubes MN1 and MN 2; in the above formula (k+1) I B *R so An output voltage (R) generated for purposely introduced mismatch dsonH /R si )*(R dsonMs /(R dsonMs +R M ) And power tube current I L In a fixed ratio.
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| CN201811170641.6A CN109254188B (en) | 2018-10-09 | 2018-10-09 | High-speed current detection circuit suitable for switching power supply |
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| CN201811170641.6A CN109254188B (en) | 2018-10-09 | 2018-10-09 | High-speed current detection circuit suitable for switching power supply |
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| CN109254188B true CN109254188B (en) | 2023-12-01 |
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| CN111208337A (en) * | 2020-01-10 | 2020-05-29 | 南京能瑞自动化设备股份有限公司 | Current sampling circuit and current detection system |
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