Temperature control current generating circuit, chip and electronic device

Abstract

This disclosure provides a temperature-controlled current generating circuit. The temperature-controlled current generating circuit includes a temperature-controlled voltage generating circuit, a voltage-controlled current generating circuit, and an output current regulating circuit. The temperature-controlled voltage generating circuit is configured to generate a temperature-controlled voltage based on a temperature-controlled current output from the output current regulating circuit and the current junction temperature. The voltage-controlled current generating circuit is configured to generate a voltage-controlled current when the temperature-controlled voltage equals a first preset voltage. The output current regulating circuit is configured to regulate the temperature-controlled current under the control of the voltage-controlled current. The initial junction temperature value for regulating the temperature-controlled current is inversely proportional to the initial value of the temperature-controlled current. When the current junction temperature is equal to or greater than the initial junction temperature value corresponding to the initial value of the temperature-controlled current, the temperature-controlled voltage equals the first preset voltage.

Description

Technical Field

[0001] The embodiments disclosed herein relate to the field of integrated circuit technology, and more specifically, to temperature-controlled current generating circuits, chips, and electronic devices. Background Technology

[0002] The linear decrease in charging current with increasing chip temperature has always been one of the challenges in the circuit design of linear charging chips. In linear charging chips, since this linear decrease in charging current with increasing chip temperature is an auxiliary function, the circuit design is relatively simple. Precise requirements are not placed on the start and end ranges of junction temperature regulation, the slope of the current decrease, or the switching between control loops and temperature regulation circuits under different charging modes. Once the requirements of the application increase, the circuit design needs further optimization. Summary of the Invention

[0003] The embodiments described herein provide a temperature-controlled current generating circuit, chip, and electronic device.

[0004] According to a first aspect of this disclosure, a temperature-controlled current generating circuit is provided. The temperature-controlled current generating circuit includes: a temperature-controlled voltage generating circuit, a voltage-controlled current generating circuit, and an output current regulating circuit. The temperature-controlled voltage generating circuit is configured to generate a temperature-controlled voltage based on a temperature-controlled current output from the output current regulating circuit and a current junction temperature. The voltage-controlled current generating circuit is configured to generate a voltage-controlled current when the temperature-controlled voltage equals a first preset voltage. The output current regulating circuit is configured to regulate the temperature-controlled current under the control of the voltage-controlled current. The initial junction temperature value for regulating the temperature-controlled current is inversely proportional to the initial value of the temperature-controlled current. When the current junction temperature is equal to or greater than the initial junction temperature value corresponding to the initial value of the temperature-controlled current, the temperature-controlled voltage equals the first preset voltage.

[0005] In some embodiments of this disclosure, when the temperature-controlled current is adjusted, the temperature-controlled current decreases linearly as the junction temperature increases. The temperature-controlled voltage generation circuit includes: a current sampling circuit, a current-controlled voltage generation circuit, a negative temperature coefficient voltage generation circuit, a first current generation circuit, a current mirror circuit, and a voltage output circuit. The current sampling circuit is configured to sample the temperature-controlled current to generate a sampling current and provide the sampling current to the current-controlled voltage generation circuit via a first node. The current-controlled voltage generation circuit is configured to generate a current-controlled voltage that is linearly positively correlated with the sampling current and provide the current-controlled voltage to the first current generation circuit via a first node. The negative temperature coefficient voltage generation circuit is configured to generate a negative temperature coefficient voltage and provide the negative temperature coefficient voltage to the first current generation circuit via a second node. The first current generation circuit is configured to generate a first current based on the voltage difference between the current-controlled voltage and the negative temperature coefficient voltage and provide the first current to the current mirror circuit via a third node. When the temperature-controlled current is adjusted, the voltage difference is a fixed value. The current mirror circuit is configured to generate a mirror current of the first current and provide the mirror current to the voltage output circuit via the fourth node. The voltage output circuit is configured to generate a temperature-controlled voltage at the fourth node based on the mirror current.

[0006] In some embodiments of this disclosure, the current-controlled voltage generation circuit includes: a first operational amplifier, a first transistor, a first resistor, and a second resistor. A first input terminal of the first operational amplifier is provided with a second reference voltage. A second input terminal of the first operational amplifier is coupled to a first terminal of the first transistor, a first end of the first resistor, and a first end of the second resistor. The output terminal of the first operational amplifier is coupled to the control terminal of the first transistor. The second terminal of the first transistor is coupled to a first voltage terminal. The second end of the first resistor is coupled to a second voltage terminal. The second end of the second resistor is coupled to a first node.

[0007] In some embodiments of this disclosure, the first current generating circuit includes a second operational amplifier, a second transistor, and a third resistor. The first input terminal of the second operational amplifier is coupled to a first node. The second input terminal of the second operational amplifier is coupled to a first terminal of the second transistor and a first terminal of the third resistor. The output terminal of the second operational amplifier is coupled to the control terminal of the second transistor. The second terminal of the second transistor is coupled to a third node. The second terminal of the third resistor is coupled to a second node.

[0008] In some embodiments of this disclosure, the current mirror circuit includes: a third to a sixth transistor, a fourth resistor, and a fifth resistor. The control electrode of the third transistor is coupled to the control electrode of the fourth transistor, the second electrode of the fifth transistor, and the first terminal of the fourth resistor. The first electrode of the third transistor is coupled to the first electrode of the fourth transistor and a first voltage terminal. The second electrode of the third transistor is coupled to the first electrode of the fifth transistor. The second electrode of the fourth transistor is coupled to the first electrode of the sixth transistor. The control electrode of the fifth transistor is coupled to the control electrode of the sixth transistor, the second terminal of the fourth resistor, and a third node. The second electrode of the sixth transistor is coupled to the first terminal of the fifth resistor. The second terminal of the fifth resistor is coupled to the fourth node.

[0009] In some embodiments of this disclosure, the negative temperature coefficient voltage generating circuit includes a seventh transistor. The control electrode of the seventh transistor is coupled to its second terminal and a second node. The first terminal of the seventh transistor is coupled to a second voltage terminal.

[0010] In some embodiments of this disclosure, the voltage output circuit includes a sixth resistor, wherein a first terminal of the sixth resistor is coupled to a fourth node, and a second terminal of the sixth resistor is coupled to a second voltage terminal.

[0011] In some embodiments of this disclosure, the voltage-controlled current generating circuit includes an error amplifier and an eighth transistor. A first input terminal of the error amplifier is coupled to the output terminal of the temperature-controlled voltage generating circuit. A second input terminal of the error amplifier is provided with a first reference voltage. The output terminal of the error amplifier is coupled to the control terminal of the eighth transistor. The difference between a first preset voltage and the first reference voltage is set such that the output voltage of the error amplifier is equal to the threshold voltage of the eighth transistor. A first terminal of the eighth transistor is coupled to a second voltage terminal. A second terminal of the eighth transistor is coupled to the input terminal of the output current regulating circuit.

[0012] According to a second aspect of this disclosure, a temperature-controlled current generating circuit is provided. This temperature-controlled current generating circuit includes: a current sampling circuit, an output current regulating circuit, a first to an eighth transistor, a first to a sixth resistor, a first operational amplifier, a second operational amplifier, and an error amplifier. The current sampling circuit is configured to sample the temperature-controlled current output from the output current regulating circuit to generate a sampling current, and to output the sampling current from its output terminal. A first input terminal of the first operational amplifier is provided with a second reference voltage. A second input terminal of the first operational amplifier is coupled to a first electrode of the first transistor, a first terminal of the first resistor, and a first terminal of the second resistor. The output terminal of the first operational amplifier is coupled to the control electrode of the first transistor. A second electrode of the first transistor is coupled to a first voltage terminal. A second terminal of the first resistor is coupled to a second voltage terminal. A second terminal of the second resistor is coupled to the output terminal of the current sampling circuit and the first input terminal of the second operational amplifier. A second input terminal of the second operational amplifier is coupled to a first electrode of the second transistor and a first terminal of the third resistor. The output terminal of the second operational amplifier is coupled to the control electrode of the second transistor. A second electrode of the second transistor is coupled to a second terminal of the fourth resistor, the control electrode of the fifth transistor, and the control electrode of the sixth transistor. The second terminal of the third resistor is coupled to the control electrode and the second electrode of the seventh transistor. The first electrode of the seventh transistor is coupled to the second voltage terminal. The control electrode of the third transistor is coupled to the control electrode of the fourth transistor, the second electrode of the fifth transistor, and the first terminal of the fourth resistor. The first electrode of the third transistor is coupled to the first electrode of the fourth transistor and the first voltage terminal. The second electrode of the third transistor is coupled to the first electrode of the fifth transistor. The second electrode of the fourth transistor is coupled to the first electrode of the sixth transistor. The second electrode of the sixth transistor is coupled to the first terminal of the fifth resistor. The second terminal of the fifth resistor is coupled to the first terminal of the sixth resistor and the first input terminal of the error amplifier. The second terminal of the sixth resistor is coupled to the second voltage terminal. The second input terminal of the error amplifier is provided with a first reference voltage. The output terminal of the error amplifier is coupled to the control electrode of the eighth transistor. The first electrode of the eighth transistor is coupled to the second voltage terminal. The second electrode of the eighth transistor is coupled to the input terminal of the output current regulation circuit. The output current regulation circuit is configured to regulate the temperature control current under the control of the current flowing through the eighth transistor. The resistance value of the second resistor is set such that the voltage difference across the third resistor is a fixed value when the temperature control current is regulated.

[0013] According to a third aspect of this disclosure, a chip is provided. The chip includes a temperature-controlled current generating circuit as described in a first or second aspect of this disclosure.

[0014] According to a fourth aspect of this disclosure, an electronic device is provided. The electronic device includes the chip described in a third aspect of this disclosure. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of this disclosure, the accompanying drawings of the embodiments will be briefly described below. It should be understood that the drawings described below only relate to some embodiments of this disclosure and are not intended to limit this disclosure, wherein:

[0016] Figure 1 This is an exemplary circuit diagram of a temperature-controlled current generation circuit;

[0017] Figure 2 This is a schematic diagram illustrating the desired effect of the temperature-controlled current generation circuit.

[0018] Figure 3 This is a schematic block diagram of a temperature-controlled current generating circuit according to an embodiment of the present disclosure;

[0019] Figure 4 yes Figure 3 A further schematic block diagram of the temperature-controlled current generation circuit shown; and

[0020] Figure 5 yes Figure 4 The circuit diagram shown is an example of a temperature-controlled current generation circuit.

[0021] In the accompanying diagram, markers with the same last two digits correspond to the same elements. It should be noted that the elements in the diagram are schematic and not drawn to scale. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this disclosure. All other embodiments obtained by those skilled in the art based on the described embodiments of this disclosure without creative effort are also within the scope of protection of this disclosure.

[0023] Unless otherwise defined, all terms used herein (including technical and scientific terms) shall have the same meaning as commonly understood by one of ordinary skill in the art to which this subject matter pertains. It will be further understood that terms such as those defined in commonly used dictionaries shall be interpreted as having the meaning consistent with their meaning in the context of the specification and in the relevant art, and shall not be interpreted in an idealized or overly formal form unless otherwise explicitly defined herein. As used herein, the statement of “connecting” or “coupling” two or more parts together shall mean that these parts are directly joined together or joined through one or more intermediate components.

[0024] In all embodiments of this disclosure, since the source and drain of a metal-oxide-semiconductor (MOS) transistor are symmetrical, and the conduction current directions between the source and drain of an N-type transistor and a P-type transistor are opposite, the controlled middle terminal of the MOS transistor is referred to as the control terminal, and the remaining two terminals of the MOS transistor are referred to as the first terminal and the second terminal, respectively. Furthermore, for the sake of consistency, in this context, the base of a bipolar junction transistor (BJT) is referred to as the control terminal, the emitter of the BJT as the first terminal, and the collector of the BJT as the second terminal. Additionally, terms such as "first" and "second" are used only to distinguish one component (or part of a component) from another component (or another part of a component).

[0025] Figure 1 An exemplary circuit diagram of a temperature-controlled current generation circuit 100 is shown. The temperature-controlled current generation circuit 100 includes: a current source Itj, transistors Qn1, Qn2, and Mn, an error amplifier EA, and an output current regulation circuit 110. Transistors Qn1 and Qn2 are bipolar transistors. Transistor Mn is a MOS transistor. The current source Itj provides a constant current to transistors Qn1 and Qn2. The non-inverting input of the error amplifier EA is supplied with a first reference voltage Vref1. The inverting input of the error amplifier EA is supplied with a voltage Vtj.

[0026] because Figure 1 Transistors Qn1 and Qn2 in the circuit are bipolar transistors. According to the characteristics of bipolar transistors, the voltage Vtj at the second terminal of transistor Qn1 has a negative temperature coefficient. As the junction temperature increases, the voltage Vtj gradually decreases, thus the output voltage ea_out of the error amplifier EA gradually increases. When the output voltage ea_out rises to a level that turns on transistor Mn, transistor Mn outputs a current Isink to the output current regulation circuit. Under the control of the current Isink, the output current regulation circuit adjusts the temperature-controlled current Iout so that the temperature-controlled current Iout decreases linearly as the junction temperature increases.

[0027] In some application scenarios, it is desirable to arbitrarily set the start and end range of junction temperature regulation (i.e., to regulate the temperature control current Iout) according to application requirements, and to achieve an inverse relationship between the starting value of junction temperature regulation and the initial value of temperature control current Iout. Figure 2This diagram illustrates the desired effect of the temperature-controlled current generation circuit. When the initial value of the temperature-controlled current Iout is Is0, junction temperature regulation begins at junction temperature T0. When the initial value of the temperature-controlled current Iout is Is1, junction temperature regulation begins at junction temperature T1. When the initial value of the temperature-controlled current Iout is Is2, junction temperature regulation begins at junction temperature T2. Regardless of the initial value of the temperature-controlled current Iout, the trajectory of its decrease coincides, reaching zero at junction temperature Te. For example, when the initial value of the temperature-controlled current is Is1, assuming the initial junction temperature is below T1, the desired effect is that the temperature-controlled current generation circuit begins junction temperature regulation when the junction temperature rises to T1, so that the temperature-controlled current Iout decreases linearly as the junction temperature increases. During periods when the junction temperature is below T1, the temperature-controlled current Iout remains constant at Is1.

[0028] The embodiments of this disclosure provide a temperature-controlled current generating circuit capable of achieving the above-described effects. Figure 3 A schematic block diagram of a temperature-controlled current generating circuit 300 according to an embodiment of the present disclosure is shown. The temperature-controlled current generating circuit 300 includes a temperature-controlled voltage generating circuit 310, a voltage-controlled current generating circuit 320, and an output current regulating circuit 330.

[0029] The input terminal of the temperature-controlled voltage generating circuit 310 is coupled to the output terminal of the output current regulating circuit 330. The output terminal of the temperature-controlled voltage generating circuit 310 is coupled to the input terminal of the voltage-controlled current generating circuit 320. The temperature-controlled voltage generating circuit 310 is configured to generate a temperature-controlled voltage Vcon based on the temperature-controlled current Iout output from the output current regulating circuit 330 and the current junction temperature.

[0030] The input terminal of the voltage-controlled current generating circuit 320 is coupled to the output terminal of the temperature-controlled voltage generating circuit 310. The output terminal of the voltage-controlled current generating circuit 320 is coupled to the input terminal of the output current regulating circuit 330. The voltage-controlled current generating circuit 320 is also coupled to a first reference voltage terminal. The voltage-controlled current generating circuit 320 is configured to generate a voltage-controlled current Isink when the temperature-controlled voltage Vcon equals a first preset voltage. The first reference voltage Vref1 from the first reference voltage terminal is used to set the voltage value of the first preset voltage. For example, depending on the specific circuit structure of the voltage-controlled current generating circuit 320, the first preset voltage can be set to be ΔV higher or lower than the first reference voltage Vref1. ΔV represents a fixed difference (e.g., the threshold voltage of a transistor).

[0031] In some embodiments of this disclosure, the maximum value of the temperature control voltage Vcon is equal to a first preset voltage. When the temperature control voltage Vcon is less than the first preset voltage, no voltage-controlled current Isink is generated (i.e., the voltage-controlled current Isink is zero). In some alternative embodiments of this disclosure, the minimum value of the temperature control voltage Vcon is equal to the first preset voltage. When the temperature control voltage Vcon is greater than the first preset voltage, no voltage-controlled current Isink is generated (i.e., the voltage-controlled current Isink is zero).

[0032] The input terminal of the output current regulating circuit 330 is coupled to the output terminal of the voltage-controlled current generating circuit 320. The output terminal of the output current regulating circuit 330 is coupled to the input terminal of the temperature-controlled voltage generating circuit 310. The output current regulating circuit 330 is configured to regulate the temperature-controlled current Iout under the control of the voltage-controlled current Isink. In some embodiments of this disclosure, the temperature-controlled current Iout is regulated when the voltage-controlled current Isink is not zero. The temperature-controlled current Iout is not regulated when the voltage-controlled current Isink is zero.

[0033] Specifically, the initial junction temperature value used to adjust the temperature-controlled current Iout is inversely proportional to the initial value of the temperature-controlled current Iout. When the current junction temperature is equal to or greater than the initial junction temperature value corresponding to the initial value of the temperature-controlled current Iout, the temperature-controlled voltage Vcon is equal to the first preset voltage.

[0034] In the temperature-controlled current generating circuit 300 according to an embodiment of the present disclosure, the temperature-controlled voltage generating circuit 310 sets the temperature-controlled voltage Vcon equal to a first preset voltage when the current junction temperature is equal to the initial junction temperature value corresponding to the initial value of the temperature-controlled current Iout. The voltage-controlled current generating circuit 320 generates a voltage-controlled current Isink at this time. The output current regulating circuit 330 regulates the temperature-controlled current Iout under the control of the voltage-controlled current Isink. As the current junction temperature increases, the temperature-controlled voltage Vcon remains equal to the first preset voltage. Therefore, the voltage-controlled current Isink remains unchanged, and the temperature-controlled current Iout can be continuously regulated.

[0035] In some embodiments of this disclosure, when the temperature control current Iout is adjusted, the temperature control current Iout decreases linearly as the junction temperature increases.

[0036] The temperature-controlled current generating circuit 300 according to embodiments of the present disclosure can set the start and end range of junction temperature regulation, and can realize that the starting value of junction temperature regulation is inversely proportional to the initial value of temperature-controlled current Iout, thereby achieving... Figure 2 The effect shown.

[0037] Figure 4 Show Figure 3A further schematic block diagram of the temperature-controlled current generation circuit 400 is shown. The temperature-controlled voltage generation circuit 410 includes: a current sampling circuit 411, a current-controlled voltage generation circuit 412, a negative temperature coefficient voltage generation circuit 413, a first current generation circuit 414, a current mirror circuit 415, and a voltage output circuit 416.

[0038] The input terminal of the current sampling circuit 411 is coupled to the output terminal of the output current regulation circuit 330. The output terminal of the current sampling circuit 411 is coupled to the current control voltage generation circuit 412 and the first current generation circuit 414 via the first node N1. The current sampling circuit 411 is configured to sample the temperature control current Iout to generate a sampling current Isns, and provide the sampling current Isns to the current control voltage generation circuit 412 via the first node N1. In some embodiments of this disclosure, Isns = Iout / K, where K represents the sampling ratio.

[0039] The current-controlled voltage generation circuit 412 is coupled to the output of the current sampling circuit 411 and the first current generation circuit 414 via the first node N1. The current-controlled voltage generation circuit 412 is configured to generate a current-controlled voltage V that is linearly positively correlated with the sampled current Isns. N1 And provides a current-controlled voltage V to the first current-generating circuit 414 via the first node N1. N1 Among them, the current control voltage V N1 It has a zero temperature coefficient, and the current-controlled voltage V remains constant regardless of junction temperature changes. N1 It is always linearly positively correlated with the sampling current Isns. The current-controlled voltage V N1 It is equal to the voltage at the first node N1.

[0040] The negative temperature coefficient voltage generating circuit 413 is coupled to the first current generating circuit 414 via the second node N2. The negative temperature coefficient voltage generating circuit 413 is configured to generate a negative temperature coefficient voltage V. N2 And through the second node N2, it provides a negative temperature coefficient voltage V to the first current generating circuit 414. N2 In some embodiments of this disclosure, the negative temperature coefficient voltage V N2 It decreases linearly with increasing junction temperature. Negative temperature coefficient voltage V N2 It is equal to the voltage at the second node N2.

[0041] The first current generating circuit 414 is coupled to the current-controlled voltage generating circuit 412 and the current sampling circuit 411 via a first node N1. The first current generating circuit 414 is coupled to the negative temperature coefficient voltage generating circuit 413 via a second node N2. The first current generating circuit 414 is coupled to the current mirror circuit 415 via a third node N3. The first current generating circuit 414 is configured to: based on the current-controlled voltage V... N1 With negative temperature coefficient voltage VN2 The voltage difference between the two is used to generate a first current I1, which is then supplied to the current mirror circuit 415 via the third node N3. Wherein, when the temperature-controlled current Iout is adjusted, the current-controlled voltage V... N1 With negative temperature coefficient voltage V N2 The voltage difference between them is a fixed value.

[0042] A current mirror circuit 415 is coupled to a first current generating circuit 414 via a third node N3. The current mirror circuit 415 is coupled to a voltage output circuit 416 via a fourth node N4. The current mirror circuit 415 is configured to generate a mirror current I2 of the first current I1 and provide the mirror current I2 to the voltage output circuit 416 via the fourth node N4. In some embodiments of this disclosure, the ratio of the first current I1 to the mirror current I2 is 1:N, where N is a positive number.

[0043] The voltage output circuit 416 is coupled to the current mirror circuit 415 via the fourth node N4. The voltage output circuit 416 is configured to generate a temperature-controlled voltage Vcon at the fourth node N4 based on the mirrored current I2. The temperature-controlled voltage Vcon is equal to the voltage at the fourth node N4. The fourth node N4 is coupled to the output of the temperature-controlled voltage generating circuit 410. The temperature-controlled voltage Vcon is output from the output of the temperature-controlled voltage generating circuit 410 to the voltage-controlled current generating circuit 420.

[0044] exist Figure 4 In the example, the voltage-controlled current generating circuit 420 includes an error amplifier EA and an eighth transistor M8. The first input terminal of the error amplifier EA is coupled to the output terminal of the temperature-controlled voltage generating circuit 410. The second input terminal of the error amplifier EA is provided with a first reference voltage Vref1. The output terminal of the error amplifier EA is coupled to the control terminal of the eighth transistor M8. The first terminal of the eighth transistor M8 is coupled to a second voltage terminal V2. The second terminal of the eighth transistor M8 is coupled to the input terminal of the output current regulating circuit 330. The current flowing through the eighth transistor M8 is the aforementioned voltage-controlled current Isink.

[0045] exist Figure 4 In the example, the second voltage terminal V2 is grounded. The first input terminal of the error amplifier EA is the non-inverting input terminal. The second input terminal of the error amplifier EA is the inverting input terminal.

[0046] refer to Figure 2 Assume the initial value of the temperature-controlled current is Is1, and the initial value of the junction temperature is lower than T1. Junction temperature regulation has not yet begun. Therefore, the sampling current Isns remains constant, thus keeping the current-controlled voltage V... N1 It remains unchanged. As the junction temperature gradually increases, the negative temperature coefficient voltage V... N2 Reduce, current control voltage V N1With negative temperature coefficient voltage V N2 The voltage difference between the junctions gradually increases, causing the temperature control voltage Vcon to gradually increase as well. When the junction temperature rises to T1, the temperature control voltage Vcon rises to the first preset voltage, and the output voltage ea_out of the error amplifier EA rises to the level that turns on the eighth transistor M8. The eighth transistor M8 outputs a voltage-controlled current Isink to the output current regulation circuit 330. The output current regulation circuit controls the temperature control current Iout to decrease linearly through the voltage-controlled current Isink. When the temperature control current Iout is adjusted, the current control voltage V... N1 The negative temperature coefficient voltage V decreases as the junction temperature increases. N2 It also decreases as the junction temperature increases. By setting the slope of their decrease, the current-controlled voltage V can be adjusted. N1 With negative temperature coefficient voltage V N2 The voltage difference between them is a fixed value, thus keeping the temperature control voltage Vcon constant. Therefore, the voltage control current Isink remains constant, allowing for continuous adjustment of the temperature control current Iout.

[0047] Figure 5 Show Figure 4 The circuit diagram shown is an exemplary circuit diagram of the temperature-controlled current generating circuit 500. Current control voltage V N1 The generation circuit 512 includes: a first operational amplifier A1, a first transistor M1, a first resistor R1, and a second resistor R2. The first input terminal of the first operational amplifier A1 is provided with a second reference voltage Vref2. The second input terminal of the first operational amplifier A1 is coupled to the first terminal of the first transistor M1, the first terminal of the first resistor R1, and the first terminal of the second resistor R2. The output terminal of the first operational amplifier A1 is coupled to the control terminal of the first transistor M1. The second terminal of the first transistor M1 is coupled to a first voltage terminal V1. The second terminal of the first resistor R1 is coupled to a second voltage terminal V2. The second terminal of the second resistor R2 is coupled to a first node N1.

[0048] The first current I1 generating circuit 514 includes: a second operational amplifier A2, a second transistor M2, and a third resistor R3. The first input terminal of the second operational amplifier A2 is coupled to the first node N1. The second input terminal of the second operational amplifier A2 is coupled to the first terminal of the second transistor M2 and the first terminal of the third resistor R3. The output terminal of the second operational amplifier A2 is coupled to the control terminal of the second transistor M2. The second terminal of the second transistor M2 is coupled to the third node N3. The second terminal of the third resistor R3 is coupled to the second node N2.

[0049] The current mirror circuit 515 includes: a third transistor M3 to a sixth transistor M6, a fourth resistor R4, and a fifth resistor R5. The control electrode of the third transistor M3 is coupled to the control electrode of the fourth transistor M4, the second electrode of the fifth transistor M5, and the first terminal of the fourth resistor R4. The first electrode of the third transistor M3 is coupled to the first electrode of the fourth transistor M4 and a first voltage terminal V1. The second electrode of the third transistor M3 is coupled to the first electrode of the fifth transistor M5. The second electrode of the fourth transistor M4 is coupled to the first electrode of the sixth transistor M6. The control electrode of the fifth transistor M5 is coupled to the control electrode of the sixth transistor M6, the second terminal of the fourth resistor R4, and a third node N3. The second electrode of the sixth transistor M6 is coupled to the first terminal of the fifth resistor R5. The second terminal of the fifth resistor R5 is coupled to the fourth node N4. In some embodiments of this disclosure, the ratio of the width-to-length ratio of the third transistor M3 to the width-to-length ratio of the fourth transistor M4 is 1:N, where N is a positive number.

[0050] The negative temperature coefficient voltage generating circuit 513 includes a seventh transistor Q7. The control electrode of the seventh transistor Q7 is coupled to its second terminal and the second node N2. The first terminal of the seventh transistor Q7 is coupled to the second voltage terminal V2.

[0051] The voltage output circuit 516 includes a sixth resistor R6, wherein the first end of the sixth resistor R6 is coupled to the fourth node N4. The second end of the sixth resistor R6 is coupled to the second voltage terminal V2.

[0052] exist Figure 5 In the example, a high-voltage signal is input from the first voltage terminal V1, and the second voltage terminal V2 is grounded. The first transistor M1, the second transistor M2, and the eighth transistor M8 are NMOS transistors. The third transistor M3 to the sixth transistor M6 are PMOS transistors. The seventh transistor Q7 is an NPN bipolar transistor. The first input terminal of the first operational amplifier A1 is a non-inverting input terminal. The second input terminal of the first operational amplifier A1 is an inverting input terminal. The first input terminal of the second operational amplifier A2 is a non-inverting input terminal. The second input terminal of the second operational amplifier A2 is an inverting input terminal. The first input terminal of the error amplifier EA is a non-inverting input terminal. The second input terminal of the error amplifier EA is an inverting input terminal. Those skilled in the art should understand that, based on the above inventive concept... Figure 5 Any modifications to the circuit shown should also fall within the scope of this disclosure. In such modifications, the transistor and voltage terminals may also have the same characteristics as described above. Figure 5 The examples shown have different settings.

[0053] The following is combined with Figure 2 and Figure 5 The following example illustrates the operation of the temperature-controlled current generating circuit 500 according to an embodiment of the present disclosure.

[0054] Because the two input terminals of the op-amp are virtually shorted and virtually open, the voltage at the inverting input terminal of the first op-amp A1 is equal to the second reference voltage Vref2 at its non-inverting input terminal, that is, the voltage V at the fifth node N5. N5 Equal to Vref2. Therefore, the voltage (current control voltage) V at the first node N1 is... N1 =R2×Isns+V N5 = R2 × Isns + Vref2. Where R2 represents the resistance value of the second resistor R2, and Isns represents the current value of the sampling current Isns. In embodiments of this disclosure, the second resistor R2 is a zero-temperature coefficient resistor. Therefore, the voltage Vref2 at the first node N1... N1 It is linearly related to the sampling current Isns but independent of temperature.

[0055] Similarly, the voltage at the inverting input of the second operational amplifier A2 is equal to the voltage V at its non-inverting input. N1 That is, the voltage V at the sixth node N6. N6 equals V N1 The voltage difference across the third resistor R3 is V. N1 -V N2 , where V N2 This is equal to the base-emitter voltage Vbe of the seventh transistor Q7. Therefore, the voltage difference across the third resistor R3 can be expressed as R2×Isns+Vref2-Vbe. The first current I1 flowing through the third resistor R3 is calculated as (R2×Isns-Vbe+Vref2) / R3. Since the mirror current I2 is equal to N times the first current I1, the voltage at the fourth node N4 is calculated as Vcon=N×(R2×Isns-Vbe+Vref2)×R6 / R3.

[0056] refer to Figure 2 Assume the initial value of the temperature-controlled current Iout is Is1, and the initial value of the junction temperature is lower than T1. Junction temperature regulation has not yet begun. Therefore, the sampling current Isns remains constant, thus keeping the current-controlled voltage V... N1 The base-emitter voltage Vbe of the seventh transistor Q7 remains unchanged. As the junction temperature gradually increases, the base-emitter voltage Vbe of Q7 gradually increases. By adjusting the value of the second resistor R2, the base-emitter voltage Vbe can be adjusted after the junction temperature reaches T1. N1 -V N2=R2×Isns+Vref2-Vbe remains constant, thus making the temperature control voltage Vcon a fixed value. In this case, by setting N, Vref2, R6, and R3, Vcon can be kept at the first preset voltage. Therefore, the output voltage ea_out of the error amplifier EA rises to the point that the eighth transistor M8 turns on, and the eighth transistor M8 outputs a voltage-controlled current Isink to the output current regulation circuit 330. The output current regulation circuit controls the temperature control current Iout to decrease linearly through the voltage-controlled current Isink. When the temperature control current Iout is adjusted, the current control voltage V N1 With negative temperature coefficient voltage V N2 The voltage difference (R2×Isns-Vbe+Vref2) is a fixed value, thus keeping the temperature control voltage Vcon constant. Therefore, the voltage-controlled current Isink remains constant, allowing for continuous adjustment of the temperature control current Iout.

[0057] Those skilled in the art should understand that Figure 5 The internal structures of the current sampling circuit 411 and the output current regulation circuit 330 can be implemented in a conventional manner. The embodiments disclosed herein do not limit the specific implementation of the current sampling circuit 411 and the output current regulation circuit 330.

[0058] Embodiments of this disclosure also provide a chip. This chip includes a temperature-controlled current generation circuit according to embodiments of this disclosure. This chip is, for example, a power management chip.

[0059] Embodiments of this disclosure also provide an electronic device. This electronic device includes a chip according to embodiments of this disclosure. The electronic device is, for example, a smart charging device or a smart terminal device (such as a tablet computer, smartphone, etc.).

[0060] In summary, the temperature control current generating circuit according to the embodiments of this disclosure can not only control the temperature control current to decrease linearly as the junction temperature increases, but also arbitrarily set the start and end range of junction temperature adjustment (i.e., temperature control current adjustment) according to application requirements, and can realize that the starting value of junction temperature adjustment is inversely proportional to the initial value of temperature control current.

[0061] Unless otherwise expressly indicated by the context, the singular form of words used herein and in the appended claims includes the plural form, and vice versa. Thus, when referring to the singular, the plural form of the corresponding term is generally included. Similarly, the terms “comprising” and “including” shall be interpreted as including rather than exclusively. Likewise, the terms “including” and “or” shall be interpreted as including unless such interpretation is expressly prohibited herein. Where the term “example” is used herein, particularly when it follows a set of terms, the “example” is merely exemplary and illustrative and should not be considered exclusive or extensive.

[0062] Further aspects and scope of adaptation become apparent from the description provided herein. It should be understood that various aspects of this application may be implemented individually or in combination with one or more other aspects. It should also be understood that the descriptions and specific embodiments herein are for illustrative purposes only and are not intended to limit the scope of this application.

[0063] Several embodiments of this disclosure have been described in detail above. However, it is obvious that those skilled in the art can make various modifications and variations to the embodiments of this disclosure without departing from the spirit and scope of this disclosure. The scope of protection of this disclosure is defined by the appended claims.

Claims

1. A temperature-controlled current generating circuit, comprising: Temperature-controlled voltage generation circuit, voltage-controlled current generation circuit, and output current adjustment circuit. The temperature control voltage generating circuit is configured to generate a temperature control voltage based on the temperature control current output from the output current regulating circuit and the current junction temperature. The voltage-controlled current generating circuit is configured to generate a voltage-controlled current when the temperature control voltage is equal to a first preset voltage. The output current regulating circuit is configured to regulate the temperature-controlled current under the control of the voltage-controlled current; Wherein, the initial junction temperature value for adjusting the temperature control current is inversely proportional to the initial value of the temperature control current, and when the current junction temperature is equal to or greater than the initial junction temperature value corresponding to the initial value of the temperature control current, the temperature control voltage is equal to the first preset voltage; Wherein, when the temperature control current is adjusted, the temperature control current decreases linearly as the junction temperature increases; The temperature-controlled voltage generation circuit includes: a current sampling circuit, a current-controlled voltage generation circuit, a negative temperature coefficient voltage generation circuit, a first current generation circuit, a current mirror circuit, and a voltage output circuit. The current sampling circuit is configured to: sample the temperature-controlled current to generate a sampling current, and provide the sampling current to the current-controlled voltage generating circuit via a first node; The current control voltage generating circuit is configured to generate a current control voltage that is linearly positively correlated with the sampled current, and to provide the current control voltage to the first current generating circuit via the first node; The negative temperature coefficient voltage generating circuit is configured to generate a negative temperature coefficient voltage and provide the negative temperature coefficient voltage to the first current generating circuit via a second node. The first current generating circuit is configured to generate a first current based on the voltage difference between the current control voltage and the negative temperature coefficient voltage, and to provide the first current to the current mirror circuit via a third node, wherein the voltage difference is a fixed value when the temperature control current is adjusted. The current mirror circuit is configured to generate a mirror current of the first current and provide the mirror current to the voltage output circuit via the fourth node; The voltage output circuit is configured to generate the temperature control voltage at the fourth node based on the mirror current. The voltage-controlled current generating circuit includes an error amplifier and an eighth transistor. Wherein, the first input terminal of the error amplifier is coupled to the output terminal of the temperature control voltage generating circuit, the second input terminal of the error amplifier is provided with a first reference voltage, and the output terminal of the error amplifier is coupled to the control electrode of the eighth transistor. Wherein, the difference between the first preset voltage and the first reference voltage is set such that the output voltage of the error amplifier is equal to the threshold voltage of the eighth transistor. The first terminal of the eighth transistor is coupled to the second voltage terminal, and the second terminal of the eighth transistor is coupled to the input terminal of the output current regulation circuit.

2. The temperature-controlled current generating circuit according to claim 1, wherein, The current-controlled voltage generation circuit includes: a first operational amplifier, a first transistor, a first resistor, and a second resistor. Wherein, the first input terminal of the first operational amplifier is provided with a second reference voltage, the second input terminal of the first operational amplifier is coupled to the first terminal of the first transistor, the first terminal of the first resistor and the first terminal of the second resistor, and the output terminal of the first operational amplifier is coupled to the control terminal of the first transistor; The second terminal of the first transistor is coupled to the first voltage terminal; The second end of the first resistor is coupled to the second voltage terminal; The second end of the second resistor is coupled to the first node.

3. The temperature-controlled current generating circuit according to claim 1, wherein, The first current generating circuit includes: a second operational amplifier, a second transistor, and a third resistor. Wherein, the first input terminal of the second operational amplifier is coupled to the first node, the second input terminal of the second operational amplifier is coupled to the first electrode of the second transistor and the first terminal of the third resistor, and the output terminal of the second operational amplifier is coupled to the control electrode of the second transistor; The second terminal of the second transistor is coupled to the third node; The second end of the third resistor is coupled to the second node.

4. The temperature-controlled current generating circuit according to claim 1, wherein, The current mirror circuit includes: a third to a sixth transistor, a fourth resistor, and a fifth resistor. Wherein, the control electrode of the third transistor is coupled to the control electrode of the fourth transistor, the second electrode of the fifth transistor and the first terminal of the fourth resistor, the first electrode of the third transistor is coupled to the first electrode of the fourth transistor and the first voltage terminal, and the second electrode of the third transistor is coupled to the first electrode of the fifth transistor; The second terminal of the fourth transistor is coupled to the first terminal of the sixth transistor; The control electrode of the fifth transistor is coupled to the control electrode of the sixth transistor, the second terminal of the fourth resistor, and the third node; The second terminal of the sixth transistor is coupled to the first terminal of the fifth resistor; The second end of the fifth resistor is coupled to the fourth node.

5. The temperature-controlled current generating circuit according to claim 1, wherein, The negative temperature coefficient voltage generating circuit includes a seventh transistor, wherein the control electrode of the seventh transistor is coupled to the second electrode of the seventh transistor and the second node, and the first electrode of the seventh transistor is coupled to the second voltage terminal; and / or The voltage output circuit includes a sixth resistor, wherein a first end of the sixth resistor is coupled to the fourth node, and a second end of the sixth resistor is coupled to the second voltage terminal.

6. A temperature-controlled current generating circuit, comprising: The circuit includes a current sampling circuit, an output current adjustment circuit, transistors one through eight, resistors one through six, an operational amplifier, an operational amplifier, and an error amplifier. The current sampling circuit is configured to: sample the temperature control current output from the output current regulation circuit to generate a sampling current, and output the sampling current from the output terminal of the current sampling circuit; The first input terminal of the first operational amplifier is provided with a second reference voltage, the second input terminal of the first operational amplifier is coupled to the first terminal of the first transistor, the first terminal of the first resistor and the first terminal of the second resistor, and the output terminal of the first operational amplifier is coupled to the control terminal of the first transistor. The second terminal of the first transistor is coupled to the first voltage terminal; The second end of the first resistor is coupled to the second voltage terminal; The second end of the second resistor is coupled to the output terminal of the current sampling circuit and the first input terminal of the second operational amplifier; The second input terminal of the second operational amplifier is coupled to the first terminal of the second transistor and the first terminal of the third resistor, and the output terminal of the second operational amplifier is coupled to the control terminal of the second transistor. The second terminal of the second transistor is coupled to the second terminal of the fourth resistor, the control terminal of the fifth transistor, and the control terminal of the sixth transistor; The second end of the third resistor is coupled to the control electrode and the second electrode of the seventh transistor; The first terminal of the seventh transistor is coupled to the second voltage terminal; The control electrode of the third transistor is coupled to the control electrode of the fourth transistor, the second electrode of the fifth transistor, and the first terminal of the fourth resistor; the first electrode of the third transistor is coupled to the first electrode of the fourth transistor and the first voltage terminal; and the second electrode of the third transistor is coupled to the first electrode of the fifth transistor. The second terminal of the fourth transistor is coupled to the first terminal of the sixth transistor; The second terminal of the sixth transistor is coupled to the first terminal of the fifth resistor; The second end of the fifth resistor is coupled to the first end of the sixth resistor and the first input end of the error amplifier; The second terminal of the sixth resistor is coupled to the second voltage terminal; The second input terminal of the error amplifier is provided with a first reference voltage, and the output terminal of the error amplifier is coupled to the control electrode of the eighth transistor. The first terminal of the eighth transistor is coupled to the second voltage terminal, and the second terminal of the eighth transistor is coupled to the input terminal of the output current regulation circuit. The output current regulating circuit is configured to regulate the temperature control current under the control of the current flowing through the eighth transistor. The resistance value of the second resistor is set such that the voltage difference across the third resistor is a fixed value when the temperature control current is adjusted.

7. A chip, comprising: The temperature-controlled current generating circuit according to any one of claims 1 to 6.

8. An electronic device, comprising: The chip according to claim 7.

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